EC1000 manual

EC1000 manual
48275-18
EC1000 PROCESS
pH/ORP SYSTEM
INSTRUCTION MANUAL
© Hach Company, 1994-1997. All rights are reserved. Printed in the U.S.A.
al/dk 7/97 3ed
2
CERTIFICATION
Hach Company certifies this instrument was tested thoroughly, inspected, and found to
meet its published specifications when it was shipped from the factory.
The EC1000 Process pH/ORP System has been tested and is certified as indicated to the
following instrumentation standards:
Product Safety
Listed by ETL to UL Standard 3101-1 (Listing # H0492805390)
Certified by ETL to CSA Standard C22.2 No. 142 (ETLc Certification # H0492805390)
Certified by Hach Company to EN 61010-1 (IEC1010-1), supporting test records by
Intertek Testing Services
Immunity
EN 50081-2 (European Generic Immunity Standard) per 89/336/EEC EMC: Supporting
test records Amador (TUV Product Services), certified compliance by Hach Company.
Required Standard/s include:
IEC 801-2 & IEC 1000-4-2 Electro-Static Discharge
IEC 801-3 Radiated RF Electro-Magnetic Fields*
IEC 801-4 Electrical Fast Transients/Burst
Emissions
Emissions per 89/336/EEC EMC: Supporting test records by Intertek Testing Services
(ETL), certified compliance by Hach Company.
Required Standard/s include:
EN 55011 (CISPR 11) Emissions, Class B Limits
CANADIAN INTERFERENCE-CAUSING EQUIPMENT REGULATION, IECS-003, Class A
Supporting test records by Intertek Testing Services (ETL), certified compliance by
Hach Company.
This Class A digital apparatus meets all requirements of the Canadian InterferenceCausing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
FCC PART 15, Class "A" Limits:
Supporting test records by Intertek Testing Services (ETL), certified compliance by
Hach Company.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
* Electromagnetic Radiation of 3 Volts/meter or greater can cause instrument inaccuracy. For complete accuracy details in an
RF environment, refer to the Supplementary Compliance Information in this manual.
3
CERTIFICATION, continued
Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference, in which case the user will be required to
correct the interference at his own expense.
Shielded cables must be used with this unit to ensure compliance with the Class A FCC
limits. Because this instrument operates on and generates radio frequency energy,
interference to radio and television reception may occur. If such interference does occur,
the operator should take the necessary steps to correct the interference. The following
techniques of reducing the interference problems are applied easily.
1. Disconnect power from the EC1000 Controller to verify that it is the source of
the interference.
2. If the EC1000 Controller is plugged into the same outlet as the device with which it is
interfering, try another outlet.
3. Move the EC1000 Controller away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.
4
TABLE OF CONTENTS
CERTIFICATION .......................................................................................................................................................... 3
SPECIFICATIONS ........................................................................................................................................................ 9
SAFETY PRECAUTIONS .......................................................................................................................................... 13
OPERATION .............................................................................................................................................................. 15
SECTION 1 GENERAL INFORMATION ........................................................................................................... 17
1.1 Instrument Description ........................................................................................................................................... 17
1.2 EC1000 pH/ORP Controller ................................................................................................................................... 17
1.3 Electrolyte Pump .................................................................................................................................................... 17
1.4 Hach One Process pH Electrode ............................................................................................................................ 21
1.4.1 Sodium Error .............................................................................................................................................. 21
1.5 Hach One ORP Electrode ....................................................................................................................................... 21
1.6 Industrial Process pH Electrode ............................................................................................................................. 22
1.7 Sample Handling System ....................................................................................................................................... 22
1.7.1 Submersible ................................................................................................................................................ 22
1.7.2 Flow-Thru Cell ........................................................................................................................................... 22
1.7.3 In-Line ........................................................................................................................................................ 22
1.8 Principle of Operation ............................................................................................................................................ 23
SECTION 2 OPERATION ...................................................................................................................................... 25
2.1 Operating the User-Programmable Setup ............................................................................................................... 25
2.1.1 Moving Around the Menu .......................................................................................................................... 25
2.1.2 Editing a Setup Value ................................................................................................................................. 25
2.1.3 Restoring Default Settings .......................................................................................................................... 27
2.2 Setup Menu ............................................................................................................................................................. 28
2.2.1 Alarms ........................................................................................................................................................ 28
2.2.2 Recorder Output ......................................................................................................................................... 29
2.2.3 PID Output .................................................................................................................................................. 30
2.2.4 Recorder 2 ................................................................................................................................................... 33
2.2.5 Initial Setup ................................................................................................................................................. 33
2.2.5.1 Temperature Compensation Setup ............................................................................................... 33
2.2.6 Keylock ....................................................................................................................................................... 35
2.2.7 Reference Solution Timer ........................................................................................................................... 36
2.2.8 Warnings ..................................................................................................................................................... 36
2.3 Calibration .............................................................................................................................................................. 37
2.3.1 pH Calibration ............................................................................................................................................ 38
2.3.1.1 Two-Point Calibration with Auto Recognition of Hach Buffers ................................................. 39
2.3.1.2 One-Point Grab Sample Calibration ............................................................................................ 40
2.3.1.3 Calibration Procedure Variations ................................................................................................. 40
2.3.1.4 One Point Calibration with a Buffer ............................................................................................ 41
2.3.1.5 Calibration Review ....................................................................................................................... 41
2.3.2 Temperature Calibration ............................................................................................................................. 41
2.3.3 ORP Calibration/mV Zero .......................................................................................................................... 42
2.3.3.1 Preamp Zero ................................................................................................................................. 42
2.3.3.2 ORP Electrode Check .................................................................................................................. 43
2.3.3.3 mV Offset ..................................................................................................................................... 43
5
TABLE OF CONTENTS, continued
SECTION 3 SERIAL INTERFACE .......................................................................................................................45
3.1 Optional Serial Interface Board ..............................................................................................................................45
3.2 Data Communications Format/Setup ......................................................................................................................45
3.3 Print Format ............................................................................................................................................................45
3.4 Remote Input Commands .......................................................................................................................................46
SECTION 4 PID CONTROL ..................................................................................................................................49
4.1 pH Controller Basics ...............................................................................................................................................49
4.2 Instrument Settings .................................................................................................................................................49
4.2.1 Set Point ......................................................................................................................................................49
4.2.2 Dead Band ...................................................................................................................................................49
4.2.3 Preset ...........................................................................................................................................................49
4.3 Gain .........................................................................................................................................................................49
4.3.1 Reset (Integral) ............................................................................................................................................52
4.3.2 Rate (Derivative) .........................................................................................................................................52
4.3.3 Curve ...........................................................................................................................................................52
INSTALLATION/MAINTENANCE .....................................................................................................................55
SECTION 5
INSTALLATION ...............................................................................................................................57
5.1 Unpacking the Instrument .......................................................................................................................................57
5.2 Industrial Process pH Electrode Preparation ..........................................................................................................57
5.3 Mounting the Controller .........................................................................................................................................57
5.3.1 Panel Mounting ...........................................................................................................................................57
5.3.2 Wall Mounting ............................................................................................................................................59
5.3.3 Pole Mounting .............................................................................................................................................59
5.4 Mounting the Pump .................................................................................................................................................59
5.5 Installing the pH/ORP Electrode ............................................................................................................................60
5.5.1 In-Line Electrode Installation .....................................................................................................................62
5.5.2 Submersible Sensor Installation ..................................................................................................................62
5.5.3 Flow-Thru Cell Installation .........................................................................................................................62
5.6 Wiring the Meter .....................................................................................................................................................63
5.6.1 Wire Preparation .........................................................................................................................................64
5.6.2 Power ...........................................................................................................................................................65
5.6.2.1 Line Voltage Selection for Meter .................................................................................................66
5.6.3 Alarms .........................................................................................................................................................66
5.6.4 Recorder and Controller ..............................................................................................................................66
5.6.5 Electrode Wiring .........................................................................................................................................67
5.6.6 Electrode Output Connections ....................................................................................................................67
5.7 Pump Wiring ...........................................................................................................................................................68
5.7.1 Line Voltage Selection for Electrolyte Pump .............................................................................................69
SECTION 6 BASIC START-UP ..............................................................................................................................71
6.1 Introduction .............................................................................................................................................................71
6.2.1 Assembling the Electrolyte Line .................................................................................................................71
6.2.2 Connection to the Pump Module .................................................................................................................71
6.2.3 Connection to the pH Electrode ..................................................................................................................71
6.3 Purging the System .................................................................................................................................................72
6.4 Calibration ...............................................................................................................................................................73
SECTION 7 SERIAL INTERFACE .......................................................................................................................75
7.1 Installation ...............................................................................................................................................................75
7.2 RS-232C Interface Configuration ...........................................................................................................................77
7.3 Current Loop Configuration ...................................................................................................................................77
6
TABLE OF CONTENTS, continued
SECTION 8 ELECTRODE AND PUMP MAINTENANCE ............................................................................... 81
8.1 Electrode Maintenance ........................................................................................................................................... 81
8.1.1 General Electrode Maintenance .................................................................................................................. 81
8.1.2 Removing Existing Electrode ..................................................................................................................... 81
8.1.3 Sensor Replacement ................................................................................................................................... 81
8.1.4 Replacing Electrolyte ................................................................................................................................. 82
8.1.5 Crystal Formation in Reference Tube ........................................................................................................ 84
8.1.6 Purging the System ..................................................................................................................................... 84
8.1.7 Storage and Conditioning ........................................................................................................................... 84
8.1.7.1 pH Electrode Storage and Conditioning ...................................................................................... 84
8.1.7.2 ORP Electrode Storage and Conditioning .................................................................................... 84
8.1.7.3 Industrial pH Electrode Shelf Life and Storage ........................................................................... 86
8.1.8 pH Electrode Cleaning ................................................................................................................................ 86
8.1.9 ORP Electrode Cleaning ............................................................................................................................. 87
8.1.10 Industrial pH Electrode Cleaning ............................................................................................................... 87
8.2 Pump Maintenance ................................................................................................................................................. 87
8.2.1 Changing Pump Tubing .............................................................................................................................. 87
8.3 Fuse Replacement ................................................................................................................................................... 88
8.3.1 Meter Fuse Replacement ............................................................................................................................ 88
8.3.2 Pump Fuse Replacement ............................................................................................................................ 90
8.4 Pump Motor Replacement ...................................................................................................................................... 90
SECTION 9 TROUBLESHOOTING ..................................................................................................................... 91
9.1 Troubleshooting the EC1000 Controller ................................................................................................................ 91
9.1.1 Test Diagnostic Menu ................................................................................................................................. 91
9.1.2 Error Codes ................................................................................................................................................. 94
9.1.3 System Warnings ........................................................................................................................................ 95
9.2 Troubleshooting the pH Electrode ......................................................................................................................... 96
9.3 Troubleshooting the ORP Electrode
............................................................................................................... 98
SECTION 10 SCHEMATICS ................................................................................................................................. 103
GENERAL INFORMATION ............................................................................................................................... 107
REPLACEMENT PARTS ......................................................................................................................................... 109
HOW TO ORDER ...................................................................................................................................................... 113
REPAIR SERVICE .................................................................................................................................................... 114
APPENDIX A Process pH Electrode Without Internal Preamp ........................................................................... 115
APPENDIX B Supplemental Compliance Information ......................................................................................... 117
INDEX ......................................................................................................................................................................... 119
7
8
SPECIFICATIONS
(Specifications subject to change without notice.)
CONTROLLER SPECIFICATIONS
Ranges: pH: -2 to 16 pH; mV: -2000 to +2000 mV; Temperature: -5 to +105 °C
Accuracy*: pH: ±0.02 pH; mV: ±1.0% of reading, ±35 mV non-calibrated;
Temperature: ±1.5 °C before calibration with electrode, ±0.4 °C after calibration with
electrode.
Resolution: pH: 0.01 pH; mV: 0.1 mV; Temperature: 0.1 °C
Repeatability: pH: ±0.02 pH; mV: ±0.1 mV; Temperature: ±0.2 °C
Temperature Calibration: 1 or 2 point with zero and slope adjustments
Temperature Compensation: -5 to +105 °C for Nearnst equation (auto/manual);
0 to 60 °C for auto buffer recognition
Solution Temperature Correction: Corrected to 25 °C, 0.1 to -0.1 pH units/°C slope
Operating Temperature: -10 to 60 °C
Storage Temperature: -40 to 60 °C
Humidity Range: 5 to 90% RH non-condensing
Relative mV Adjustment: The mV zero may be offset to any point in the ±2000 range
Alarms: Alarms 1 and 2: Usable in any of operating modes, (pH/mV/Temperature).
Programmable for either low or high set point alarm. Alarm relays SPDT with contacts
rated at 5A resistive load at 30 Vrms (42.4 Vpk).
Recorder Output: Isolated 4-20 mA (adjustable to 0-20 mA at 900 ohms)
Controller Output: Proportional, Integral, Derivative. Additional resistors can be used to
provide 0 to 10 V, 0 to 1 V, or 0 to 100 mV outputs.
Input/Output (optional): RS-232C and 20 mA current loop
Signal Average: 0 to 10 seconds
Reading Update: Every 0.4 seconds
Power Requirements: 115/230 Vac (±17%), 50/60 Hz, 8 watts
Controller Enclosure: NEMA 4X/IP66 (rear connections). Suitable for 1/2-inch conduit.
Wall, panel or pole mounted. For indoor use.
Controller Dimensions: 14.4 cm x 14.4 cm x 12.5 cm deep (5.67" x 5.67" x 4.9" deep).
Panel cutout size: 14 cm x 14 cm (5.5" x 5.5")
* Intermittent Electromagnetic Radiation of 3 Volts per meter or greater may cause measurement inaccuracy. For complete
accuracy details in an RF environment, see the Supplemental Compliance Information in this manual.
9
SPECIFICATIONS, continued
Hach One® PROCESS pH SPECIFICATIONS
pH Range: 0 to 14 pH
Accuracy*: pH: ±0.02 pH; Temperature: ±1.5 °C before calibration, ±0.4 °C after
calibration
Repeatability: pH: ±0.02 pH (calibrated at 25 °C and measured at 25 °C);
Temperature: ±0.2 °C
Temperature Range: 0 to 60 °C
Pressure Range: 0 to 35 psi (241 kPa)
Slope: 58 mV± 2 mV/pH units at 28 °C
Reference Element: Ag/AgCl double junction
Electrode Diameter: 28.6 mm (1.125") at tip
Electrode Length: 20.3 cm (8")
Reference Tubing Length: 6.1 m (20 feet) optional 50 feet
Cable Length: 6.1 m (20 feet). Expandable to 1000 feet
Submersion Application: Operational to a depth of 40 feet
Electrical Output: Two 4-20 mA current loops, directly proportional to mV and
temperature
Electrode Housing: Kynar (lower body)/Noryl (polyphenylene oxide) (upper body)
Hach One ORP ELECTRODE SPECIFICATIONS
mV Range: -2000 to 2000 mV
Temperature Range: 0 to 60 °C
Pressure Range: 0 to 35 psi (241 kPa)
Accuracy*: mV: ±10 mV; Temperature: ±1.5 °C before calibration, ±0.4 °C after
calibration
Repeatability: mV: ±2 mV; Temperature: ±0.2 °C
Sensing Element: Platinum disc (99.998% pure)
Reference Element: Ag/AgCl double junction
Reference Potential: 32 ±5 mV vs. SCE
Electrode Diameter: 28.6 mm (1.125") at tip
Electrode Length: 20.3 cm (8")
Reference Tubing Length: 6.1 m (20 feet) optional 50 feet
Cable Length: 6.1 m (20 feet). Expandable to 1000 feet
Submersion Application: Operational to a depth of 40 feet
Electrical Output: Two 4-20 mA current loops, directly proportional to mV and
Temperature
Electrode Housing: Kynar (lower body)/Noryl (polyphenylene oxide) (upper body)
* Calibrated at 25 °C and measured at 25 °C and at atmospheric pressure.
10
SPECIFICATIONS, continued
INDUSTRIAL PROCESS pH ELECTRODE SPECIFICATIONS
pH Range: 0 to 12 pH
Reproducibility: ±2% of reading
Temperature and Pressure Range: 0 to 80 °C at 0 to 100 psig; 0 to 100 °C at
ambient pressure
Slope: (pH 4 to pH 7) @ 25 °C: >170 mV
Reference Element: Ag/AgCl
Electrode Diameter: 28.2 mm (1.11") at tip
Electrode Length: 175 mm (6.9")
Electrode Housing: CPVC
PUMP MODULE SPECIFICATIONS
Pressure Range: 0 to 35 psi (241 kPa)
Operating Temperature Range: -20 to 60 °C
Humidity Range: 5 to 90% RH non-condensing
Reagent Usage: Reference solution capacity for a minimum of 1 month of operation
Power Requirements: 115/230 Vac (±17%), 50/60 Hz, 9 VA, 8 watts
Enclosure: NEMA 4X/IP66—Wall mounting, with 1/2-inch NPT for conduit
connections. For indoor use.
MOUNTING KIT SPECIFICATIONS
SUBMERSION APPLICATION
Maximum Submersion Depth: 40 feet (due to restrictions on reference tubing length)
Maximum Velocity at Electrode Tip: 15 km/hour
IN-LINE APPLICATION
Maximum Pressure: 35 psi (241 kPa)
Maximum Flow Rate: 40 L/minute
Minimum Flow Rate: 10 mL/minute
FLOW-THRU CELL APPLICATION
Maximum Flow Rate: 750 mL/minute
Minimum Flow Rate: 1 mL/minute
11
12
SAFETY PRECAUTIONS
Before attempting to unpack, set up, or operate this instrument, please read this entire
manual. Pay particular attention to all warnings, cautions and notes. Failure to do so could
result in serious injury to the operator or damage to the equipment.
To ensure the protection provided by this equipment is not impaired, this equipment
MUST NOT be installed or used in any manner other than that which is specified in
this manual.
Use of Hazard Information
If multiple hazards exist, the signal word corresponding to the greatest hazard shall
be used.
DANGER
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in
death or serious injury
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury
NOTE
Information that requires special emphasis
Precautionary Labels
Please pay particular attention to labels and tags attached to the instrument. Personal
injury or damage to the instrument could occur if not observed.
This symbol, if noted on the instrument, references the instruction manual for
operational and/or safety information.
Section 5.4 Installing the pH/ORP Electrode
Section 5.5 Wiring Meter
Section 5.5.2 Power
Section 5.6 Wiring Pump
Section 7.1 Installation
Section 8.1.7 pH Electrode Cleaning
Section 8.1.8 ORP Electrode Cleaning
Section 8.1.9 Industrial pH Electrode Cleaning
13
14
OPERATION
WARNING
Handling chemical samples, standards, and reagents can be dangerous. Review the necessary
Material Safety Data Sheets and become familiar with all safety procedures before handling
any chemicals.
ADVERTENCIA
La manipulación de muestras químicas, patrones y reactivos puede ser peligrosa. Antes de
manipular cualquier productor químico, conviene leer las Fichas Técnicas de Seguridad y
familiarizarse con los procedimientos de sugeridad.
ADVERTÊNCIA
A manipulação de amostras, padrões e reagentes químicos pode ser perigosa. Reveja as necessárias
Fichas Técnicas de Segurança do Material e familiarizese com os procedimentos de segurança
antes de manipular quaisquer substãncias químicas.
ATTENTION
La manipulation des échantillons chimiques, étalons et réactifs peut être dangereuse. Lire les fiches
de données de sécurité des produits nécessaires et se familiariser avec toutes les procédures de
sécurité avant de manipuler tout produit chimique.
WARNHINWEIS
Da das Arbeiten mit chemikalischen Proben, Standards, Reagenzien und Abfällen mit Gefahren
verbunden ist, empfiehlt die Hach Company dem Benutzer dieser Produkte dringend, sich vor der
Arbeit mit sicheren Verfahrensweisen und dem richtigen Gebrauch der Chemikalien oder
Biogefahrgut vertraut zu machen und alle entsprechenden Materialsicherheitsdatenblätter
aufmerksam zu lesen.
15
16
SECTION 1 GENERAL INFORMATION
1.1 Instrument Description
The EC1000 Process pH/ORP Monitoring System consists of the Series EC1000
Controller, a Hach One Pump Module, and a Hach One Process pH or ORP Electrode
assembly. The system monitors a sample stream for its pH value within the range of 0 to
14, or its millivolt potential from -2000 to +2000 mV, and its temperature ranging from
0 to 60 °C. The system also indicates when preset high and low alarm limits are exceeded,
provides relay closures for external devices, and provides output currents to drive a
recorder and remote process control equipment. Each of these items are described in
detail in the following sections.
1.2 EC1000 pH/ORP Controller
The controller is menu driven with PID capability and is housed in a NEMA 4X/IP66
enclosure (see Figure 1 on page 18). It is set up to receive two current loop inputs from a
pH or ORP probe preamplifier, and to provide a continuous readout of the sample pH or
millivolt value as well as the sample temperature. Output capabilities of the controller
include two 4-20 mA outputs for recording and controlling pumps and optional RS-232C
and 20 mA current loop serial port. Alarm features include user programmable Alarm 1
and Alarm 2 setpoint selections for any one of the operating modes (pH, millivolt, or
temperature) with SPDT relay contacts. The alarm can be a combination of
operating modes:
(Example 1)
Alarm 1-pH High Alarm
Alarm 2-Temperature High Alarm
(Example 2)
Alarm 1-pH Low Alarm
Alarm 2-Temperature Low Alarm
The EC1000 Controller can be mounted up to 1000 feet from the electrode. The pump
module can be mounted up to 50 feet from the electrode.
1.3 Electrolyte Pump
Note: The electrolyte
pump is not used with the
self-pressurized Industrial
Process pH Electrode with
self-pressurized
electrolyte, Cat. No.
48276-00. See Section 1.6
Industrial Process pH
Electrode.
The pump used on this system is a low pressure linear peristaltic pump, which operates up
to 35 psi. The pump is housed in a NEMA 4X enclosure, and allows for a maximum of
50 feet separation from the electrode. It continuously pumps electrolyte through a freeflowing junction in the electrode (500 mL of electrolyte [Cat. No. 24291-49]) lasts
approximately 30 days). The pump module contains a refillable electrolyte reservoir (see
Figure 2 on page 20).
17
Figure 1
Controller Front Panel
18
Table 1 Controller Front Panel
Item
Name
Function
1
LED Display
Main display field. Consists of eight 14-segment alpha-numeric 0.54″ high red LED characters.
During normal operation, this field displays either the pH or mV value (depending on the mode of
operation selected). This field also displays menu messages, edit menu values, and error messages.
See Figure 1.
2
Secondary
Display Field
The secondary display field consists of three 7-segment numeric 0.3″ high green LED digits.
During normal operation, this field displays temperature. In the setup menu, this field displays
abbreviations to help indicate which branch of the setup menu the operator is in. See Figure 1.
3
SETUP key
This key enters the setup menu. The setup is entered when it is pressed.
4
pH/mV key
During normal operation (instrument displaying pH/mV), this key toggles the reading between
pH and mV. If the instrument is in any of the menus, pressing this key returns the instrument to
normal operation.
5
ENTER key
This key, within the menus, either moves a level deeper into the menus, or accepts an edited selection.
6
CLEAR key
This key, within the menus, either clears changes in an edit portion of a menu, or backs up one menu
level. If this instrument is in an edit portion of a menu selection, and the value is changed, then this key
restores the original value. Otherwise, this key causes the menu selection to back up one level; if the
menu is at the top level, this key returns the instrument to normal operation (instrument
displaying pH/mV).
7
RIGHT
ARROW key
This key, in an edit portion of a menu selection, selects the next digit to the right to edit. The selected
digit flashes. When the instrument is in one of the non-editing portions of the calibration/setup menus,
or in normal operation (instrument displaying pH/mV), this key is not valid; if pressed, an INVALID
message flashes on the main display.
8
HOLD/DOWN
ARROW key
During normal operation (instrument displaying pH/mV), this key functions as a hold. When pressed,
the outputs (alarm relays, recorder, and controller outputs) alternately hold at the current value, or
release to normal operation. When the outputs are held, the first character in the main display
flashes an H. (Note: The H appears only during normal operation; in the menus, the H does not
appear.) After the outputs are in the hold state for 30 minutes, they automatically release. When
the instrument is in one of the calibration/setup menus, this key scrolls down through the menu
selections. When the instrument is in an edit portion of a menu selection, this key decreases the
selected (flashing) digit.
9
ALARM ACK/
UP ARROW
key
During normal operation (instrument displaying pH/mV), this key functions as an alarm acknowledge.
When pressed, the alarms are alternately disabled or enabled. When the alarms are disabled, the
three alarm indicators flash, and the alarm relays are in the non-alarm state. After the alarms are
disabled for 30 minutes, they automatically enable. When the instrument is in one of the
calibration/setup menus, this key scrolls up through the menu selections. When the instrument is in an
edit portion of a menu selection, this key increases the selected (flashing) digit.
10
CAL key
This key enters the calibration menu. From this menu, the pH electrode, temperature probe, and mV
offset can be calibrated, and the calibration reviewed.
11
System warning Red LED. Indicates a probe failure or controller malfunction. Refer to Table 4 on page 42 for specific
system warnings that appear on the main LED display. For most system warnings, the user must query
the system to determine the warning. See Figure 1.
12
Alarm 2
Red LED. User programmable setpoint alarm. See Figure 1.
13
Alarm 1
Red LED. User programmable setpoint alarm. See Figure 1.
19
Figure 2
Pump Module
20
1.4 Hach One Process pH Electrode
The Hach One pH Electrode features a continuous, free-flowing reference junction to
assure a constant long-lasting reference potential. The electrode contains a replaceable
pH glass sensor (in bulb or flat configuration) a reference half cell, a temperature sensor,
and an internal preamp. The internal preamp produces two current loop signals, one for
mV and the other for temperature. The preamp allows for up to 1000 feet of separation
between the electrode and meter, and is operable up to a depth of 40 feet. The
electrode housing works in any of the sample handling systems described in Section 1.7
Sample Handling System.
1.4.1
Sodium Error
Acid error is negligible; negative sodium error, usually present in alkaline solutions, is low
even at pH values as high as 12. To determine the sodium error in pH units, measure the
apparent pH and sodium concentration of the test solution and determine the error from
Figure 3. Locate the point (on the appropriate pH horizontal grid line) representing the
sodium concentration based on the extrapolation between the 229, 2,290, and
22,900 = mg/L Na plots. Add the vertical grid line at that point to the apparent pH meter
reading. For example, a sample that reads pH 12 with a Na+ concentration of 0.5M has a
negative sodium error of approximately 0.12 pH units. Therefore, the actual pH of the
sample is 12.12.
Figure 3
Sodium Ion Error Graph
TYPICAL SODIUM ERROR FOR
HACH ONE COMBINATION pH
ELECTRODE (AT 25 °C)
1.5 Hach One ORP Electrode
The Hach One ORP Electrode also features the continuous, free-flowing reference
junction, a temperature sensor, and a preamp. It is housed in the same electrode body as
the pH flat configured electrode (see Figure 4 on page 22). The replaceable sensor is a
Platinum disc sealed in glass. Select the mV readout for ORP applications.
21
Figure 4
Electrodes
1.6 Industrial Process pH Electrode
The Hach Industrial pH Electrode’s unique design does not use an electrolyte pump and
does not have a replaceable sensor. The low-maintenance electrode has self-pressurized
electrolyte and a flat electrode. The electrode features high temperature and pressure
resistance and is designed for traditional applications such as water and wastewater
analysis. The electrode is housed in a CPVC body with a built-in preamplifier and has the
same size and shape to fit all of the mounting configurations described in SECTION 5,
INSTALLATION.
1.7 Sample Handling System
Three sampling techniques can be used with the EC1000 pH/ORP System: submersible,
flow-thru cell, and in-line installations. Mounting kits are available for the different
applications. Refer to SECTION 5, INSTALLATION for detailed installation information.
1.7.1
Submersible
For the submersible application, mount the electrode to the end of a pipe using the
Submersible Mounting Kit (Cat. No. 46401-00), see Figure 15 on page 61, and place it in
a tank or non-flowing sample.
1.7.2
Flow-Thru Cell
The Flow-Thru Cell provides for atmospheric sampling of the process water, and easy
installation and removal of the electrode. Mounting Kit (Cat. No. 46403-00) is required,
see Figure 16 on page 61.
1.7.3
In-Line
For the in-line application, place the electrode directly in-line with the sample through a
“Tee” pipe fitting using the In-line Mounting Kit (Cat. No. 46402-00), see Figure 15 on
page 61. Pressure reducers may be required if the sample pressure is greater than 35 psig.
22
1.8 Principle of Operation
The EC1000 Process pH/ORP System consists of a combination pH or ORP electrode, a
controller, and a reference electrolyte pump (see Figure 5 on page 23). The electrode
consists of a pH or ORP measuring half cell and a double junction reference half cell,
which establish a potential characteristic of the sample. This potential is converted to a
proportional current by a built in preamplifier in order to stabilize the signal for long
distance transmission to the controller. Included in the electrode is a temperature sensor
whose signal also is stabilized and sent to the controller to allow for temperature
compensation or temperature correction of the pH/ORP measurement. Separate from the
controller and electrode is a reference electrolyte pump that supplies fresh electrolyte to
the reference half cell. The pumped electrolyte maintains an open reference junction
through a capillary outlet to produce a stable and constant reference potential.
Note: The electrolyte
pump is not used with the
self-pressurized Industrial
Process pH Electrode with
self-pressurized
electrolyte, Cat. No.
48276-00. See Section 1.6
Industrial Process pH
Electrode.
Figure 5
As the electrode measures the pH (or mV) of the water source, a signal is transmitted to
the controller. If the pH (or mV) is outside the setpoint range, the controller can transmit
a current output signal to a reagent pump (or valve) that adds reagent to a mixing tank. See
Figure 6 on page 24 for details. As the reagent is added to the water, the value of the pH
(or redox potential) is adjusted to fall within the setpoint range. Refer to SECTION 4, PID
CONTROL, for a detailed discussion of this process.
System Components
23
Figure 6
pH Control Loop
24
SECTION 2 OPERATION
2.1 Operating the User-Programmable Setup
The EC1000 Controller is a menu-operated instrument. In the setup menu, each of
the instrument settings are grouped into submenus of common settings. For user
programming, move to the desired setting, and edit the current value. Refer to
Table 18 on page 99, which describes operation of the Diagnostic Test Menu.
2.1.1
Moving Around the Menu
After pressing the SETUP key to enter the menu, use the UP and DOWN ARROW keys to
scroll through the top level menu to the desired entry. Use the ENTER key to move down
into a submenu (use the CLEAR key to back up to the next higher menu level). Once the
desired setting is displayed, press the ENTER key to display the current value of the setting,
and change the value as needed. (Exit the menu at any time by pressing the pH/mV key.)
Example—checking or changing the ALARM2, SET PoiNT:
1. Press SETUP to enter the SETUP menu.
2. Press ENTER to move into the ALARMS submenu.
3. Press the DOWN ARROW key to scroll to the ALARM2 entry.
4. Press ENTER to move into the ALARM2 submenu.
5. Press the DOWN ARROW key to scroll to the SET PoiNT entry.
6. Press ENTER to display the ALARM2 set point.
2.1.2
Editing a Setup Value
Two types of setup data require editing. The first is a number entry such as an alarm set
point. Any value in the set point range can be entered. When the number entry is selected
first, the first digit space displays a flashing + or – sign character. Pressing the UP or DOWN
ARROW key alternates between the two signs. Pressing the RIGHT ARROW key moves to
the first digit. This digit flashes indicating that it can be edited. Pressing the UP ARROW
key increases the digit value, and pressing the DOWN ARROW key decreases the digit value.
The remaining digits are changed by repeating this process. When the whole number is
changed to the desired value, press the ENTER key to save the new value. At any time
during the editing process, the original value is restored by pressing the CLEAR key.
25
Example—changing ALARM2, SET PoiNT from 16.00 pH to 7.50 pH:
1. First move to the ALARM2 set point entry as described in Section 2.1.1 Moving
Around the Menu. Press ENTER.
2. Press the RIGHT ARROW key to move the flashing digit to the right.
3. Press the DOWN ARROW key to change the 1 to 0.
4. Press the RIGHT ARROW key to move to the next digit.
5. Press the UP ARROW key to change the 6 to 7.
6. Press the RIGHT ARROW key to move to the next digit.
7. Press the UP ARROW key five times to change the 0 to 5.
8. Press ENTER to save the new value.
The second type of setup data is discrete values such as the recorder mode where a pH,
mV, or temperature recorder mode is selected. In this case, the complete entry flashes.
Pressing the UP or DOWN ARROW key scrolls through the list of settings. After selecting
the desired entry, press the ENTER key to save the setting.
Example—changing ALARM2, MODE from a PH HI alarm to TEMP LOW alarm:
1. Select ALARM2, MODE as described in Section 2.1.1 Moving Around the Menu.
Press ENTER.
2. Press the DOWN ARROW key five times to select the TEMP LOW alarm setting.
3. Press ENTER to save the new value.
26
2.1.3
Restoring Default Settings
To clear all previous settings (not necessary on first time start-up), press CLEAR and
ENTER simultaneously and the DISPlay TeST appears:
1. Press the DOWN ARROW key to scroll down through the display test menu to
COLD StaRT.
2. Press ENTER. This procedure returns all settings to the controller defaults. Table 2
shows all default values for the controller setup menu.
Table 2 Setup Menu Default Value
Menu
ALARM1
Options
Submenu
Default
MODE
—
PH HI
SET PNT
—
16.00 PH
HYST
—
0.10 PH
DLY TIME
—
0 SEC
ALARM2
[same as ALARM1]
MODE
—
PH
WINDOW
MINIMUM
-2.00 PH
—
MAXIMUM
16.00 PH
OUT TRIM
0 TRIM
1=4.00
RECORDER
—
FS TRIM
1=20.00
MODE
—
PH
SET PNT
—
7.00 PH
DEAD BD
—
0.00 PH
PRESET
—
50.0%
GAIN
—
01.00
RESET
—
00.00/HR
RATE
—
00.00 MIN
TITR CUR
CUR
LINEAR+
—
POINTS
03
OUT TRIM
0 TRIM
1=4.00
—
FS TRIM
1=20.00
°C COMP
TYPE
AUTO TC
—
SET PNT
25.0 °C
—
SOL TC
0.0 PH
SERIAL I/O
BAUD
1200
—
PARITY
NONE
—
DATA BIT
8
—
STOP BIT
2
—
PRT DLY
ENABLED
CONTROL
INIT SET
—
PRT INTR
00 MINS
OUTPUT 2
—
CONTROL
SIG AVG
—
1 SEC
27
2.2 Setup Menu
2.2.1
Alarms
Two independent programmable setpoint alarms are provided. Each alarm can be set to
operate on pH, mV, or temperature setpoints, and may be programmable to be either a high
alarm or a low alarm. When the programmed setpoints are exceeded, the alarm LED turns
on. The alarm relay actuates when external power is brought to the relays. The instrument
also features programmable alarm hysteresis and delay time. Hysteresis is the difference
between the alarm turn on and turn off values. The delay time provides a delay, from the
time the alarm setpoint is exceeded, before the alarm is actuated.
The delay time is adjustable from 0 to 30 seconds.
To check or program the alarm settings:
Press SETUP to call up the SETUP menu options.
Press ENTER to move into the ALARMS submenu.
Press ENTER to move into the ALARM1 submenu.
The MODE menu is PH high/low, mV high/low, or temperature high/low.
Press ENTER to select the MODE menu.
PH HI is the default. Scroll through the MODE menu by pressing the DOWN ARROW or
UP ARROW key.
When the desired mode is displayed, press ENTER to lock in the chosen MODE and move
to the next ALARM1 submenu.
Press ENTER. The current SET PoiNT value appears on the display.
To change the value, move the flashing display by pressing the RIGHT ARROW key
and increase or decrease the value by pressing the DOWN ARROW key or the
UP ARROW key.
When the value is set, press ENTER.
Press ENTER. The current HYSTeresis appears on the display.
The hysteresis is adjustable from 0.01 to 2.0 pH, 0.1 to 100 mV, or 0.1 to 2.0 °C.
To change the value, move the flashing display by pressing the RIGHT ARROW key and
increase or decrease the value by pressing the DOWN or UP ARROW key.
Press ENTER.
Press ENTER. The current DeLaY TIME will appear on the display. The ALARM1 delay
time is adjustable from 0 to 30 seconds. Reset the delay time by pressing the RIGHT
ARROW key and increase or decrease the value by pressing the DOWN ARROW key or
the UP ARROW key.
28
Press ENTER. The DeLaY TIME is locked in, and the display returns to:
Press CLEAR. The display backs out to:
Press the DOWN ARROW key.
The ALARM2 submenu is identical to ALARM1 submenu: mode; set point; hysteresis;
and delay time are all selected identical to ALARM1.
Press CLEAR and then CLEAR again to back out to the top level of the menu, or press
pH/mV to exit the menu.
2.2.2
Recorder Output
An isolated 4-20 mA recorder output is provided. The output also can be adjusted to
0-20 mA, and with the addition of a resistor across the recorder output lines, can be setup
as a 0 to 100 mV, 0 to 1 V, or 0 to 10 V voltage output. See Section 5.6.4 Recorder and
Controller for resistor installation. The recorder can be set to cover any portion of the pH,
mV, or temperature measurement range. The zero and full scale mA output can be
trimmed from the keyboard so the output can be calibrated to exactly 4-20 mA, or adjusted
to match the zero and full scale on the recorder being used.
To check or program the recorder settings, press the SETUP key to call up the
SETUP menu.
Press the DOWN ARROW key to scroll to:
This option controls the minimum and maximum outputs shown on the
RECORDER submenu:
Press ENTER.
PH is the default. The mode options are: PH, MV, or TEMPerature. Select the mode by
pressing the DOWN ARROW key or the UP ARROW key. When the desired MODE is
displayed, press ENTER.
This option controls minimum and maximum settings on the recorder. Press ENTER.
Press ENTER again to display the current MINimum value.
Press ENTER and change the value by pressing the RIGHT ARROW key and the DOWN
ARROW key or the UP ARROW key.
Press ENTER to advance to:
Press ENTER and change the current MAXimum value by pressing the RIGHT ARROW key
and the DOWN ARROW key or the UP ARROW key.
29
Press ENTER to save the new value.
Press CLEAR. This backs out to the WINDOW menu of the RECORDER submenu.
Next, press the DOWN ARROW key to advance to:
The function of the OUTput TRIM adjustment is slightly different from the rest of the edit
functions. When the zero (minimum scale) trim is selected, the recorder output is driven to
zero (minimum scale), and the output value is displayed with the right hand digit flashing.
If the output is too low, pressing and holding the UP ARROW key causes the output to ramp
up. When the output is correct, release the UP ARROW key. If the output is too high, use the
DOWN ARROW key to adjust the setting. If a large adjustment is required (e.g., adjusting
the recorder zero from 4 mA to 0 mA), use the RIGHT ARROW key to move the flashing
digit to the left. When the UP/DOWN ARROW keys are used, the output ramps faster.
Press ENTER.
Press ENTER to display and output the current recorder zero (in terms of mA output).
Press the DOWN ARROW key or the UP ARROW key to adjust the output.
Press ENTER.
Press ENTER to display and output the current full scale recorder (in terms of mA output).
Press the DOWN ARROW key or the UP ARROW key to adjust the output.
Press ENTER.
Press CLEAR and then CLEAR again to back out to the top level of the menu or press the
pH/mV key to exit the menu.
2.2.3
PID Output
A second isolated 4-20 mA output is provided. This output can be selected to be either
a PID controller output or a second recorder output (see Section 2.2.5 Initial Setup, INIT
SET\OUTPUT 2). If the controller output is selected, the following menu entries are
displayed. Refer to SECTION 4 PID CONTROL for a full explanation of these settings.
To check or program the controller settings:
Press SETUP to call up the SETUP menu:
Press the DOWN ARROW key and then the DOWN ARROW key again to scroll to:
Press ENTER.
The controller MODE options are pH or mV.
Press ENTER. Toggle between pH or mV by pressing the DOWN ARROW key. When the
selection is made:
Press ENTER to save the pH or mV selection and advance to:
30
Press ENTER.
The current value for SET PoiNT appears on the display. Change the value by pressing the
RIGHT ARROW key and the DOWN ARROW key or the UP ARROW key.
Press ENTER to save the SET PoiNT value and advance to:
Press ENTER.
The current value for DEAD BanD appears on the display. Change the value by pressing
the RIGHT ARROW key and the DOWN ARROW key or the UP ARROW key.
Press ENTER to save the DEAD BanD value and advance to:
Press ENTER.
The current setting for the Controller PRESET output appears on the display. Change
the value by pressing the RIGHT ARROW key and the DOWN ARROW key or the
UP ARROW key.
Press ENTER to save the PRESET value and advance to:
Press ENTER.
The current setting for the Controller GAIN appears on the display. Change the value by
pressing the RIGHT ARROW key and the DOWN ARROW key or the UP ARROW key.
Press ENTER to save the GAIN value and advance to:
Press ENTER.
The current value for the Controller RESET action appears on the display. Change
the value by pressing the RIGHT ARROW key and the DOWN ARROW key or the
UP ARROW key.
Press ENTER to save the RESET value and advance to:
Press ENTER.
The current value for the Controller RATE action appears on the display. Press the RIGHT
ARROW key and the DOWN ARROW key or the UP ARROW key to change the value.
Press ENTER to save the RATE value and advance to:
Press ENTER.
Toggle between the TITRation CURve mode selections (linear +, linear -, curve) by
pressing the DOWN ARROW key or the UP ARROW key.
The user must choose linear + or linear - unless a valid set of points is entered. Press
ENTER to save the value and advance to:
Press ENTER.
Select the number of points desired on the TITRation CURve by pressing the RIGHT
ARROW key and the DOWN ARROW key or the UP ARROW key.
(Range: 3 to 20)
Note: The following data
entry sequence is
dependent upon the
number of points selected
above (9).
Press ENTER. The display asks for percent of reagent addition (X axis) and pH or mV
value points (Y axis). Percentages and values must be entered in ascending and
descending order with a new entry for each point selected. The controller does not accept
31
repeat percentages or values. When all entries are made, return to the Controller MODE
options and select CURVE.
Example—(Assuming PH was selected for the controller MODE)
Press ENTER.
Select the percent (of reagent addition) for the first point (X axis) by pressing the RIGHT
ARROW key and the DOWN ARROW key or the UP ARROW key.
Press ENTER.
Select the PH value by pressing the RIGHT ARROW key and the DOWN ARROW key or the
UP ARROW key.
The Controller prompts the user to continue entering the percentages and PH values
through nine entries (corresponding to number of points selected). The green LED display
continues to show which point selection is being made at any time even if the user scrolls
back to the beginning of the sequence.
Press ENTER then CLEAR followed by the DOWN ARROW key to advance to:
The function of the output trim adjustment is slightly different from the rest of the edit
functions. When the zero (minimum scale) trim is selected, the controller output is driven
to zero (minimum scale), and the output value is displayed with the right hand digit
flashing. If the output is too low, pressing and holding the UP ARROW key causes the
output to ramp up.
When the output is correct, release the UP ARROW key. If the output is too high, use the
DOWN ARROW key. If a large adjustment is required (e.g., adjusting the controller zero
from 4 mA to 0 mA), use the RIGHT ARROW key to move the flashing digit to the left.
When the UP or DOWN ARROW keys are used, the output ramps faster.
Press ENTER.
Press ENTER.
This is the trim controller zero setting (in terms of mA output).
Press the DOWN ARROW key or the UP ARROW key to adjust the output.
Press ENTER.
32
Press ENTER.
This is the trim controller full scale setting (in terms of mA).
Press the DOWN ARROW key or the UP ARROW key to adjust the output.
Press CLEAR three times. This backs out to the top level of the menu, or you may press the
pH/mV key to exit the menu.
2.2.4
Recorder 2
The second isolated 4-20 mA output is provided. This output can be selected to be either
a PID controller output or a second recorder output (see INIT SET\OUTPUT 2 in Section
2.2.5 Initial Setup). This menu is the same as the recorder menu (see Section 2.2.2
Recorder Output) except that the mode selection is limited to pH and mV.
2.2.5
Initial Setup
The menu entry contains the temperature compensation (C COMP), SERIAL I/O,
OUTPUT 2, and SIGnal AVeraGing setup sub-menus.
The temperature compensation (C COMP) submenu selects between automatic and
manual temperature compensation. When automatic temperature compensation is
selected, the temperature reading from the temperature sensor built into the probe is used
to calculate the pH reading. When the manual temperature compensation is selected, the
value entered into the temperature setpoint is used to calculate the pH reading.
The solution temperature compensation (SOL TC) submenu allows for the compensation
of pH changes to the solution due to temperature. The default setting of 0 pH/°C has no
effect on the reading. For non-zero entries, the instrument subtracts the entry value times
the number of °C the solution is above 25 °C. For example, if the entry is 0.010 pH/°C and
the temperature is 50 °C, the instrument will subtract 0.25 pH from the reading. When the
entry is a non-zero value, an asterisk (*) will appear in the first display location to indicate
the solution temperature compensation is active.
The SERIAL I/O submenu sets up the RS232 C operation. Refer to SECTION 3 SERIAL
INTERFACE for a full explanation of these settings. OUTPUT 2 selects between a second
recorder output and a PID controller output.
The SIGnal AVeraGe entry changes the signal averaging to provide a more quiet signal
when the sample is erratic. The range of adjustment is 0 (no signal averaging) to 10
seconds signal average.
To check or program the initial setups refer to the following sections.
2.2.5.1
Temperature Compensation Setup
Press SETUP to call up the Setup menu:
Press the DOWN ARROW key three times to scroll to:
Press ENTER to move into the temperature compensation (C COMP) submenu.
33
Press ENTER.
Press ENTER to choose the temperature compensation mode (automatic [AUTO TC] or
manual [MAN TC]).
AUTOmatic Temperature Compensation is the default. If MANual Temperature
Compensation is chosen, press the DOWN ARROW key or the UP ARROW key to toggle to:
Press ENTER.
Press ENTER. The current SET PoiNT appears on the display.
Change the SET PoiNT (Range -5.0 to 105.0 °C) by pressing the RIGHT ARROW key
followed by the DOWN ARROW key or the UP ARROW key.
Press ENTER to save the value and advance to:
Press ENTER.
Press ENTER. The current SOLution Temperature Compensation appears on the display.
Change the SOLution TC (Range: -0.100 pH to +0.100 pH) by pressing the RIGHT ARROW
key followed by the DOWN ARROW key or the UP ARROW key.
Press ENTER, CLEAR and then the DOWN ARROW key to proceed to the SERIAL interface
submenu.
Press ENTER.
Press ENTER.
Toggle between baud rates (300, 600, 1200, 2400, 4800, 9600) by pressing the DOWN
ARROW key or the UP ARROW key.
Press ENTER when the desired rate is selected.
Press ENTER. The PARITY menu is ODD, EVEN or NONE (default is NONE).
Change the display by pressing the RIGHT ARROW key followed by the DOWN ARROW key
or the UP ARROW key.
34
Press ENTER.
The DATABIT menu is 7 or 8. Select the value by pressing the DOWN ARROW key or the
UP ARROW key.
Press ENTER.
The STOPBIT menu is 1 or 2. Select the value by pressing the DOWN ARROW key or the
UP ARROW key.
Press ENTER.
Press ENTER followed by the DOWN ARROW key or the UP ARROW key to toggle between
ENABLED and DISABLED. Press ENTER.
The PRinT INTerval setting range is 00 to 99 minutes. 00 turns the print interval off. Make
a selection by pressing the RIGHT ARROW key followed by the DOWN ARROW key or the
UP ARROW key.
Press ENTER.
PRinT LiSTing appears on the display.
Press ENTER. A listing of the instrument setup is sent to the printer. Then, OK appears on
the display momentarily and the display automatically backs out to BAUD.
Press CLEAR followed by the DOWN ARROW key. This backs out to:
Press ENTER followed by the DOWN ARROW key or the UP ARROW key to toggle between
CONTROL and RECORD2 modes.
Press ENTER.
Press ENTER.
This displays the pH SIGnal AVeraGe value (00 to 10 seconds), 03 seconds is the default.
Change the display by pressing the RIGHT ARROW key followed by the DOWN ARROW key
or the UP ARROW key.
Press ENTER followed by CLEAR to back out to the top level menu, or press the pH/mV key
to exit the menu.
2.2.6
Keylock
Note: The initial keyboard
lockout code is 0000, but is
user programmable. Refer
to Section 9.1.1 Test
Diagnostic Menu for
information on
programming the keyboard
lockout code.
To prevent unauthorized or accidental programming changes, a keyboard lockout or secure
mode is provided using a password. In the locked mode, all program menus may be
viewed, but no changes to the settings or operations are allowed. If a change is attempted,
the display will flash LOCKED to indicate that the keyboard is locked out.
The keyboard may be locked, unlocked, or temporarily (30 minutes) unlocked.
35
To set the keyboard lockout status, press SETUP to call up the setup menu:
Press the UP ARROW key three times to scroll to:
To call up the keyboard lockout code entry, press ENTER.
Using the UP ARROW and DOWN ARROW keys, enter the lockout code.
To key in the keyboard lockout code entry, press ENTER.
If the code is correct, the submenu is entered.
Scroll to the desired lockout status by pressing the DOWN ARROW key or the
UP ARROW key.
When the selection is made, press ENTER.
Press CLEAR to back out to the top level of the menu or press the pH/mV key to exit
the menu.
2.2.7
Reference Solution Timer
Note: The reference
solution timer is not used
with the non-refillable
Industrial Process pH
Electrode, Cat. No.
48276-00. However,
operators using the
Industrial Electrode are
required to reset the timer
as described.
A reference electrolyte timer is provided, which indicates when the reference electrolyte
bottle needs to be filled. Reset the timer each time the electrolyte reservoir is filled. At the
end of 30 days, the timer times out, and a system warning is displayed.
To reset the timer, press SETUP to call up the setup menu.
Press the UP ARROW twice to scroll to:
To reset the timer when adding new electrolyte to the system, press ENTER.
Press ENTER.
The display indicates OK momentarily and returns to TiMeR ReSeT. Press CLEAR to back
out to the top level menu, or press pH/mV to exit the menu.
2.2.8
Warnings
System warnings are provided to indicate possible problems in the meter and/or electrode.
If any system warning is present, the system warning LED on the front panel lights. The
WARNINGS entry of the setup menu is used to display and clear the warnings. Refer to
36
SECTION 9 TROUBLESHOOTING for additional information on the system warnings.
To display or clear the WARNINGS, press SETUP to call up the setup menu:
Press the UP ARROW key to scroll to:
Press ENTER.
Press ENTER. The system displays the Warning Codes shown in Table 3. Additional details
about the warning can be found in Section 9.1.2 Error Codes and Section 9.1.3 System
Warnings. The warning codes appear momentarily followed by CLeaR WaRNing.
Note: The probe errors
and the reference timer
time-out require the cause
of the fault to be corrected
before they will clear.
Table 3 Warning Codes
CODE
MESSAGE
CAUSE
E00
EE FAIL
EEPROM failure
E01
REF TIME
reference timer time-out
E02
SOFT SRT
software restart
E03
COLD SRT
cold restart
E04
PROBE ER
pH probe open
E05
PROBE ER
pH probe shorted
E06
PROBE ER
temperature probe open
E07
PROBE ER
temperature probe shorted
E08
MARG CAL
marginal pH offset
E09
MARG CAL
marginal pH gain
E10
MARG CAL
marginal temperature offset
E11
MARG CAL
marginal temperature gain
E12
PWR FAIL
power failure
Press ENTER to CLeaR WaRNings on the display.
2.3
Calibration
Use this menu to calibrate the pH (or ORP) electrode, review the pH calibration, calibrate
the temperature sensor, and adjust the mV offset. The calibration menu is entered by
pressing the CAL key. The first display to appear is STD 1, followed by STD 2 (after STD
1 is completed), GRAB SMP, REVIEW, TEMP, and MV ZERO. The user may then scroll
up or down through the first level of the menu to make adjustments to each calibration.
(Note: If the keyboard is locked, only the REVIEW sub menu may be entered.)
37
WARNING
To familiarize yourself
with handling
precautions, dangers and
emergency procedures,
always review the
Material Safety Data
Sheets prior to handling
containers, reservoirs,
and delivery systems that
contain chemical reagents
and standards. Protective
eye wear always is
recommended when
contact with chemicals
is possible.
ADVERTENCIA
Para familiarizarse con las precauciones de manipulación, los peligros y los prcedimientos
de emergencia, siempre estudie las Hojas de Datos de Seguridad de los Materiales antes de
manipular recipientes, depósitos y sistemas de entrega que contengan reactivos y patrones
químicos. Siempre se recomienda el uso de protectores oculares cuando sea posible el contacto
con productos químicos.
AVISO
Para familiarizar-se com as precauções de manipulação, riscos e procedimentos de emergência,
examine sempre o Folheto de Dados de Segurança antes de manipular os recipientes, tanques e
sistemas de distribuição que contenham reagentes químicos e outros elementos padronizados.
Se recomenda sempre o uso de protetores para olhos, quando possa acontecer contato com os
produtos químicos.
ATTENTION
Pour se familiariser avec les précautions à prendre lors de la manipulation, les dangers et les
procédures d'urgence, toujours lire les Fiches de Données de Sécurité des Produits avant de
manipuler les récipients, les réservoirs et les tèmes de distribution contenant les réactifs
chimiques et les solutions étalons. Il est toujours recommandé de porter des lunettes de
protection lorsqu'un contact avec les produits chimiques est possible.
WARNHINWEIS
Es wird dringend empfohlen, die Sicherheitsdatenblätter vor der Handhabung von Behältern,
Tanks und Zufuhrsystemen, die chemische Reagenzien und Standardsubstanzen enthalten,
aufmerksam durchzulesen, damit Sie sich mit den beim Umgang mit diesen Chemikalien
notwendigen Vorsichtsmaßnahmen, Risiken und Notfallschutzmaßnahmen vertraut machen,
Es wird empfohlen, in allen Situationen, in denen mit einem Kontakt mit Chemikalien zu
rechnen ist, eine Schutzbrille zu tragen.
2.3.1
pH Calibration
There are several ways to calibrate the pH electrode. The two recommended methods are
given in the next sections. The first method is a two-point calibration with buffers. Use this
method on new electrodes and periodically on electrodes already in use.
The frequency of recalibration is determined by the accuracy desired and the application in
which the electrode is used.
The second procedure listed is a one-point grab sample calibration. This method provides
for a one-point calibration without removing the electrode from service; perform it
periodically after a two-point calibration. Variations of these two calibration procedures
are given in Section 2.3.1.3 Calibration Procedure Variations.
Stability Indicator
A stability indicator is activated during the calibration to assist the user in determining a
stable input reading. The decimal point blinks when the instrument determines a reading is
unstable. The decimal point stops blinking when the instrument determines the reading is
stable. Use this indication to decide when to press the ENTER key, or use your own
judgement. Stability is determined when the mV reading changes at a rate less than
1 mV/minute.
Marginal Calibration Indication
During a calibration, a marginal message is displayed if the offset is greater than ±100 mV
or if the slope is outside the range of 50.6 to 71.2 mV. The system warning indicator lights,
but the calibration is accepted.
This warning indicates the calibration is outside the normal range. Repeat the calibration
or clean or replace the electrode.
38
Invalid Calibration Indication
During a calibration, if the offset is greater than ±300 mV, or if the slope is outside
the range of 44.2 to 89.5 mV, an invalid message is displayed and the calibration is
not accepted.
2.3.1.1
Two-Point Calibration with Auto Recognition of Hach Buffers
The buffers used in a two point calibration should bracket the pH range of the sample.
The following procedure uses the pH 4.01 (Cat. No. 22269-66) and pH 7.00
(Cat. No. 22270-66) Hach buffers supplied with the instrument, but a pH 10.00 Hach
buffer (Cat. No. 22271-66) can be used as one of the buffers. If buffers other than the ones
listed above are used, refer to Section 2.3.1.3 Calibration Procedure Variations.
1. Prepare a pH 4.01 Hach Buffer (Cat. No. 22269-66) and a pH 7.00 Hach Buffer
(Cat. No. 22270-66) by dissolving the contents of one powder pillow in 50 mL of
deionized water, and mix.
2. Remove the electrode from the sample solution and clean if needed (see Section 8.1
Electrode Maintenance).
3. Rinse the electrode with deionized water and then place the electrode in prepared pH
4.01 buffer (Cat. No. 22269-66).
4. Press CAL to call up the main calibration menu.
The display shows:
5. Press ENTER. The display shows:
6. Press ENTER. The display will show the current pH value.
7. After the electrode stabilizes (refer to the stability indicator note), press ENTER to
accept this calibration point.
8. Rinse the electrode with deionized water then place the electrode in prepared pH 7.00
buffer solution (Cat. No. 22270-66).
9. Press ENTER. The display shows:
10. Press ENTER. The display will show the current pH value.
11. After the electrode stabilizes (refer to the stability indicator note), press ENTER to
accept this calibration point.
12. Press pH/mV to return the meter to normal operations.
13. Rinse the electrode with deionized water and return it to the sample.
39
2.3.1.2
One-Point Grab Sample Calibration
This method is used to do a one point (offset) pH calibration using a grab sample
comparison of the process solution measured on a calibrated laboratory or portable pH
meter. This calibration is not as accurate as the two point calibration because it only
corrects the offset, and does not adjust the slope. A special feature of this calibration is that
the pH electrode readings are saved at the time the grab sample is taken (see Step 3). This
allows for an accurate calibration even if the pH of the process stream changes during the
time used to measure the sample on a laboratory meter.
Note: When Solution
Temperature
Compensation is
operational (non-zero, see
Section 2.2.5 Initial Setup)
the current pH value saved
and displayed in Step 3 is
the actual pH of the
process solution at the
process temperature. For
best accuracy, the lab
sample reading should be
taken at the same
temperature as the
process sample reading.
1. Press CAL to call up the main calibration menu. The display shows:
2. Press the DOWN ARROW key to proceed to:
3. Take a sample of the process solution and then press ENTER. When the enter key is
pressed, the current pH value is saved and displayed on the readout with the first
digit flashing.
4. Measure the pH of the sample on a calibrated lab meter.
5. Edit the value on the display to match the lab reading by pressing the RIGHT ARROW
key and the DOWN ARROW key or the UP ARROW key.
6. Press ENTER to accept the calibration.
7. Press pH/mV to return the meter to normal operations. The pH reading may be different
from the value just entered. This occurs if the pH of the process stream changes from
the time the grab sample was taken in Step 3. For example, if the pH of the process
stream increases by 0.15 pH during the time between Step 3 and Step 6, the current
reading should be 0.15 pH higher than the value entered in Step 5.
2.3.1.3
Calibration Procedure Variations
Manual Entry of Buffer Value
Note: The Auto recognition
function is valid only when
using the following Hach
buffers: pH 4.01, pH 7.00,
or pH 10.00. If buffers
other than those listed are
used, the buffer value must
be entered.
Use two buffers in the range of 0 to 14 pH that are at least 1 pH unit apart for calibration.
You may use one auto and one manually entered buffer or two manually entered buffers
for calibrations. The order in which the buffers are used has no effect on the calibration.
To use manual entry of buffer value(s), replace Step 6 and/or Step 10 with the
following procedure.
1. Press the DOWN ARROW key to scroll to the manual entry. The display shows:
2. Press ENTER. The readout is an edit display with a pH value such a 6.97 PH. (The
last value used is displayed.) The lower display shows the current temperature of
the buffer.
3. After the temperature reading stabilizes, use the temperature reading and the chart
provided with the pH buffer to determine the actual buffer value.
40
4. Edit the value on the display by pressing the RIGHT ARROW key and the DOWN
ARROW key or the UP ARROW key so the display matches the buffer value.
5. Press ENTER. The readout displays the current pH value.
2.3.1.4
One Point Calibration with a Buffer
To calibrate the instrument with one buffer and a one point calibration, follow the
procedure for a two point calibration with buffers, omitting Steps 8-11.
2.3.1.5
Calibration Review
The calibration review menu entry is used to track the performance of the electrode. The
menu entries are OFFSET, SLOPE, STD 1, and STD 2. The offset is a measure of the mV
reading when the electrode is at pH 7. The ideal offset is 0 mV. The slope is a measure of
the mV/pH at 25 °C, with the ideal slope being 58 mV/pH. For new electrodes, the offset
should be 0 ±35 mV, and the slope should be 58 ±2 mV. For normal calibration, the meter
accepts an offset in the range of ±100 mV and a slope in the range of 50.6 to 71.2 mV.
STD 1 and STD 2 entries recall the standard(s) used for the last calibration.
2.3.2
Temperature Calibration
The uncalibrated accuracy of the temperature sensor is ±1.5 °C and temperature
calibration is normally not required. If greater accuracy is required, use the following
procedure for either a one point or a two point calibration. The calibration temperature
should be near the anticipated operating point for a one point calibration, or bracket the
anticipated operating range and be at least 10 °C apart for a two point calibration.
1. Remove the electrode from the sample cell.
2. Place the electrode in a sample of known temperature.
s
3. Press CAL to call up the main calibration menu. The display shows:
4. Press the UP ARROW key twice. The display shows:
5. Press ENTER. The display shows:
6. Press ENTER. The display will show:
The readout is an edit display with a temperature value such as 0.0 °C. (The last value
displayed is used.)
7. Edit the value on the display by pressing the RIGHT ARROW key and DOWN ARROW
key or the UP ARROW key so that the display matches the sample temperature.
8. Press ENTER. The readout displays the current temperature of the sample.
9. After the electrode stabilizes (refer to the stability indicator note in Section 2.3
Calibration), press ENTER to accept the calibration point. If this is a one point
calibration, omit Steps 10-13.
41
Note: The temperature
difference between the
two samples must be at
least 10 °C.
10. Move the electrode to a sample at a different known temperature.
11. Press ENTER. The readout is an edit display with a temperature value such as 60.0 °C.
(The value displayed is the last value used.)
12. Edit the value on the display to match the temperature of the sample by pressing the
RIGHT ARROW key and the DOWN ARROW key or the UP ARROW key.
13. Press ENTER. The readout displays the current temperature measurement.
14. After the electrode stabilizes (refer to the stability indicator note in Section 2.3
Calibration), press ENTER to accept this calibration point.
15. Press the pH/mV key to return the meter to normal operations.
2.3.3
ORP Calibration/mV Zero
Note: Although the Light’s
Solution Ampule contains
enough solution for several
calibrations, reusing the
solution is not suggested
due to potential
contamination. Hach
Company recommends
discarding the remaining
solution after use.
The mV zero is used for ORP measurements. This entry allows for ORP calibrations and
for the mV reading to be offset to a desired value.
To calibrate the ORP electrode, the offset of the internal preamp must be zeroed, and then
the electrode must be standardized in a solution of known redox potential. Hach offers
Light’s Solution (Cat. No. 26125-20) as an ORP standard in 20-mL glass ampules sealed
under argon. Or, you may prepare your own solutions as described in Table 4.
Table 4 Preparation of Redox Standard Solutions
Standard
Solution
Hach ORP
Electrode
Pt Electrode
vs. SCE
Pt Electrode
vs. SHE*
Weight per 1000 mL Solution
at 25 °C
Light’s
Solution
446** mV
430 mV
+675 mV
39.21 g ferrous ammonium sulfate,
Fe (NH4)2 (SO4)2 • 6H2O
48.22 g ferric ammonium sulfate,
Fe (NH4) (SO4)2 • 12H2O
56.2 mL sulfuric acid, sp gr 1.84
Zobell’s
Solution
215 mV
183 mV
+428 mV
1.4080 g potassium ferrocyanide,
K4 Fe (CN)6 • 3H2O
1.0975 g potassium ferricyanide,
K3 Fe (CN)6
7.4555 g potassium chloride, KCI
* SHE = Standard Hydrogen Electrode.
** The deviation from 32.0 mV versus SCE is due to conventional junction potentials produced by the high
ionic strength of Light’s Solution.
2.3.3.1
Preamp Zero
1. Connect one end (pin) of the ORP Shorting lead to the reference pin connector at the
top of the electrode. Touch the other end directly to the platinum disc of the ORP
Sensor, see Figure 5 on page 23.
2. Press CAL to call-up the main calibration menu. The display shows:
3. Press the UP ARROW key. The display shows:
4. Press the ENTER key. The readout is an edit display such as 0.0 mV. (The value
displayed is the last value used).
5. Edit the value on the display to read 0.0 by pressing the RIGHT ARROW key and the
DOWN ARROW key or the UP ARROW key.
42
6. Keeping the ORP shorting lead in contact with the platinum disc, wait for a stable
reading and then press the ENTER key twice.
7. Press the pH/mV key to return the meter to normal operations. Remove the ORP
shorting lead.
2.3.3.2
ORP Electrode Check
To ensure the ORP electrode is functioning correctly, it is necessary to check its potential
in a solution of known redox potential. The nominal potential of the Hach EC1000 ORP
electrode in Light’s and ZoBell’s solution are given in Table 4. Also see Table 5.
The electrode should read within ±10 mV of the nominal value. The potential of the Hach
EC1000 reference electrode is 32 ±5 mV versus SCE (Saturated Calomel Electrode) in
saturated KCl Solution.
Table 5 Potential of Zobell’s Solution as a Function of Temperature
(vs. Standard Hydrogen Electrode)
2.3.3.3
Temperature (°C)
EV
Temperature (°C)
EV
1
0.481
16
0.448
2
0.479
17
0.446
3
0.476
18
0.443
4
0.474
19
0.441
5
0.472
20
0.439
6
0.470
21
0.437
7
0.468
22
0.435
8
0.465
23
0.432
9
0.463
24
0.430
10
0.461
25
0.428
11
0.459
26
0.426
12
0.457
27
0.424
13
0.454
28
0.421
14
0.452
29
0.419
15
0.450
30
0.417
mV Offset
Once it has been determined that the ORP electrode is functioning properly, a mV offset
can be performed so that the display reads values which are more familiar to the operator.
For example, if it is known that a process must be held at a set point versus SCE, then the
mV zero can be set at 430 mV when the electrode is placed into Light’s Solution. Now the
display will read mV versus SCE.
1. Remove the electrode from the sample cell.
2. Place the electrode in a sample with a known mV potential.
3. Press CAL to call up the main calibration menu. The display shows:
4. Press the UP ARROW key. The display shows:
5. Press ENTER. The readout is an edit display with a millivolt value such as 0.0 mV.
(The last value displayed is used.)
43
6. Edit the value on the display to match the mV potential of the sample by pressing the
RIGHT ARROW key and the DOWN ARROW key or the UP ARROW key.
7. Press ENTER. The readout displays the current mV value.
8. After the electrode stabilizes (refer to the stability indicator note in Section 2.3
Calibration), press ENTER to accept this calibration point.
9. Press pH/mV to return the meter to normal operations.
44
SECTION 3 SERIAL INTERFACE
3.1 Optional Serial Interface Board
A serial interface board (Cat. No. 46326-00) is available as a user-installed option for the
pH/ORP Meter. The board enables the analyzer to be connected to a printer or a computer
to provide a permanent record of pH/mV levels and the occurrence of any alarm
conditions. Connection with a computer allows the computer to compile and store sample
pH/mV data and to control analyzer programming and operation from a remote location.
The interface board was designed primarily to permit direct connection of the analyzer
data output to an external printer. Interface with an external computer requires computer
programming to permit communication with and control of the analyzer. Due to the
variety of computer equipment and programming formats in use, this manual is written
for an operator knowledgeable about digital interface protocols and programming
requirements. The interface board can be set for two serial interface configurations:
standard RS-232C format or a current loop format.
3.2 Data Communications Format/Setup
Data communication format selections of baud rate, parity, word length and stop bits, are
set in the serial [I/O] submenu of the setup menu. Refer to Section 2.2.5 Initial Setup. The
factory default settings are: 1200 baud, no parity, 8 bit word length, 2 stop bits.
The serial I/O operates without handshake, therefore care must be taken to prevent loss
of data. During data transmission from the instrument, each character is sent at 53 ms
intervals. At the end of each line a 1.5 second delay is added. This delay is required for use
with many printers that have a one line buffer. The delay allows the printer time to print
the line before the next line is started. If the printer delay is not required, it is disabled in
the serial I/O submenu of the setup menu. On the receive data, no delays are required
between characters, but the receive buffer only holds one line. Therefore if more than one
command is being sent, the response from the first command must be completed before
the next command is sent.
3.3 Print Format
The data print format is set for a 40-column print width. On power-up, (unless print
interval is set to 0) or on command, a data header is output to the printer (Figure 7).
The data header contains information about the analyzer setup. The data header may be
printed at any time by selecting the print listings.
See Figure 7 for:
• a system warning (*W9*11*)
• normal sample measurement (pH, MV, TEMP)
• an activated alarm lockout (*ALO*)
• setpoint alarms (*A1*)
• manual temperature compensation indicator (M)
• making a user calibration (pH OFFSET CAL)
45
Figure 7
Analyzer Printout
KEYBOARD LOCKED
ALARM 1 = 105.0 C LOW
ALARM 1 HYST = 0.5 C
ALARM 1 DELAY = 00 SECS
ALARM 2 = 16.00 PH HIGH
ALARM 2 HYST = 0.50 PH
ALARM 2 DELAY = 00 SECS
SIGNAL AVERAGE = 03 SECS
AUTO TEMPERATURE COMP
PRINT EVERY 00 MINS
REC MINIMUM = -2.00 PH
REC MAXIMUM = 16.00 PH
CONTROL SET PT = 7.00 PH
CONTROL PRESET = 50.0 %
CONTROL GAIN = 0.00
CONTROL RESET = 0.00 /HR
CONTROL RATE = 0.00 MIN
PH
MV
TEMP
6.35
6.34
6.89
6.80
6.80
6.80
6.81
6.81
6.35
69.7
70.5
6.5
11.6
11.6
11.6
11.3
11.3
69.4
49.0
48.9
25.0M
25.0M
25.0M
25.0M
5.0M
25.0M
49.0
pH
7.00
>16.00
7.00
OFFSET
27.8
<-2000.0
27.9
CAL
25.0
25.0
>105.0
ALARMS
*A1*
*A1*
*W5*7*11*
*W7*8*
*ALO*
*ALO*
*W8*
*W6*11*
*A2*W9*11*
*W11*
3.4 Remote Input Commands
Commands sent to the analyzer from a computer must be formatted as an ASCII character
string in uppercase or lowercase letters. Spaces are allowed, but not required. All
commands start with a three character string. If additional information is needed to set a
value, an equal sign “=” is entered, followed by the data desired. The command is
completed by sending a CR (OD Hex) [Example: To recall the alarm 1 setpoint:
A1S<CR>; to set alarm1 setpoint to 7.5: A1S=7.5<CR>]. Refer to Table 6 for a complete
command list.
All commands except cold start (CST) generate a response message indicating acceptance
or rejection of the command from the analyzer. If the command is rejected, the response
is “[?.”
Response messages from the instrument are preceded by a steering character, which the
computer program can test to determine if the line is a response message or if the line is a
routine printout. The steering character is an ASCII left bracket “[”(5B Hex).
Note: If the print interval is
set to zero (disabled), then
the only outputs generated
are response messages.
Programs (Basic, C, etc.) must be written for the computer to transmit the proper
command strings to the analyzer via the interface.
46
Table 6 RS-232 Remote Commands
Code
Function
Response
GENERAL SETUP
CST
Do a cold start
Prints setup
SCD
Set calibration defaults
OK
SAV <=(0 to 10)>
Recall or set signal average
Value (on recall); or OK (on
set)
RCV
Recall current measurement values
Prints current values
KLO
Toggles keyboard lockout status and responds with the
new status
Locked or Unlocked
TCM<=(AUTO, MAN)>
Recall or set temperature compensation mode
Value (on recall); OK (on set)
TCS<=(-5 TO 105)>
Recall or set temperature compensation setpoint
Value (on recall); OK (on set)
RSR
Reference solution timer reset
OK
RECORDER
RMD <=(PH, MV, TEMP)>
Recall or set recorder mode
Value (on recall); OK (on set)
RMX <= -2 to 16 for pH,
±2000 for mV,
-5 to 105 for temperature>
Recall or set maximum value setpoint for current recorder
type
Value (on recall); OK (on set)
RMN <= -2 to16 for pH,
±2000 for mV,
-5 to 105 for temperature>
Recall or set minimum value setpoint for current
recorder type
Value (on recall); OK (on set)
RTX <=(-2132 TO 2132)>
Move recorder trim maximum count by indicated amount
OK
RTN <=(-2132 to 2132)>
Move recorder trim minimum count by indicated amount
OK
CONTROLLER
CMD <=(pH, mV)>
Recall or set controller mode
Value (on recall); OK (on set)
CSP <=(-2 to 16 for pH,
±2000 for mV)>
Recall or set controller setpoint
Value (on recall); OK (on set)
CDB <=(0 to 2 for pH,
0 to 100 for mV)>
Recall or set controller dead band
Value (on recall); OK (on set)
CPR <=(0 to 100)>
Recall or set controller preset
Value (on recall); OK (on set)
CGN <=(0 to 99.99)>
Recall or set controller gain
Value (on recall); OK (on set)
CRS <=(0.00 to 99.99)>
Recall or set controller reset value
Value (on recall); OK (on set)
CRT <=(0.00 to 99.99)>
Recall or set controller rate value
Value (on recall); OK (on set)
CTX <=(-2132 to 2132)>
Move controller trim maximum count by indicated amount
OK
CTN =(-2132 to 2132)
Move controller trim minimum count by indicated amount
OK
ALARMS
A1M <= (PH HIGH, PH LOW,
MV HIGH, MV LOW,
TEMP HIGH, TEMP LOW)
Recall or set alarm 1 mode
Value (on recall); OK (on set)
A1S <=(-2 to 16 for pH,
±2000 for mV,
-5.0 to 105.0 for temp)>
Recall or set alarm 1 setpoint for current alarm type
Value (on recall); OK (on set)
A1H <=(0.01 to 2 for pH,
1 to 100 for mV,
0.1 to 2 for temp)>
Recall or set alarm hysteresis for current alarm type
Value (on recall); OK (on set)
A1D <=(0 to 30)>
Recall or set alarm 1 delay time
Value (on recall); OK (on set)
A2M <=(PH HIGH, PH LOW,
MV HIGH, MV LOW,
TEMP HIGH, TEMP/LOW)>
Recall or set alarm 2 mode
Value (on recall); OK (on set)
47
Table 6 RS-232 Remote Commands (continued)
Code
Function
Response
ALARMS (continued)
A2S <=(-2 to 16 for pH,
±2000 for mV,
-5.0 to 105.0 for temp)>
Recall or set alarm 2 setpoint for current alarm type
Value (on recall); OK (on set)
A2H <=(0.01 to 2 for pH,
1 to 100 for mV, 0.1 to 2
for temp)>
Recall or set alarm hysteresis for current alarm mode
Value (on recall); OK (on set)
A2D <=(0 to 30)>
Recall or set alarm 2 delay time
Value (on recall); OK (on set)
ALO
Toggles alarm lockout status and responses with the
new status
Locked or Unlocked
RWN
Recall system warnings
Print warnings followed by OK
CWN
Clears system warning
OK
PRINTER
LST
List Setup
Print Setup
PIV <=(0 to 99)>
Recall or set print interval
Value (on recall); OK (on set)
48
SECTION 4 PID CONTROL
4.1 pH Controller Basics
A simple pH control loop is shown in Figure 6 on page 24. This same configuration and
procedure can be applied to ORP applications. There are endless variations to this basic
loop, but the main elements of the loop are shown. The loop operates as follows: The pH
meter measures the value of the pH in the effluent, and, if the pH is different from the
setpoint, the controller actuates the reagent pump (or valve) that adds reagent to a mixing
tank. The added reagent adjusts the value of pH.
The physical layout of the loop, the sizing of the pump (valve), type of mixing tank, and
location of the pH electrodes all have a major effect on the ultimate performance of the
loop, after the controller is tuned for optimal performance. The largest single performance
factor is the delay time around the loop. This includes the response time of the
electrode/meter, time required to deliver the reagent to the process water, time required for
the reagent to mix with and react with the process water, and the time required to deliver
the completely mixed water to the electrode. If the delay times are too long or the mixing
is not complete, the control will be poor regardless of how well the controller is tuned.
The Process pH/ORP Meter uses a PID control algorithm. PID stands for proportional,
integral (reset), derivative (rate) control. Each of the instrument settings (in the
CONTROL menu), along with their affects on the control loop, are described below.
4.2 Instrument Settings
4.2.1
Set Point
This is the value of pH (mV) that is desired.
4.2.2
Dead Band
This is the window around the set point where the controller takes no action (any input in
this window is considered to be at the set point).
4.2.3
Preset
This is the value of the proportional component of the controller when the input is at the
set point.
Example 1—
In an application where the pH of the process water is always above the set point, only an
acid feed is required. In this case, the preset is typically set to 0%. When the pH of the
water is at or below the set point, the controller output is at zero and there is no chemical
feed (this assumes the feed pump is set up to deliver no output for a zero input and
maximum output for a full scale input). When the pH of the water goes above the set point,
the controller output goes up, increasing the chemical feed, which drives the pH of the
water down.
Example 2—
In an application where the pH of the process water can be either above or below the set
point, both an acid and caustic feed is required.
4.3 Gain
Refer to Figure 8 for a diagram of the controller output response (proportional only) to a
step change on the input. The gain setting determines the instrument’s sensitivity to an
error (the difference between the set point and the input pH). If the gain is doubled, then
the output signal doubles for a given error signal. For a proportional only controller
(integral and derivative settings off), the steady state error decreases with higher gains, but,
49
if the gain is set too high, the loop goes into oscillation. Because the proportional output is
the error times the gain, there must be an error term (unless the required output is the same
as the preset value).
Figure 8
PID Controller Output Response
50
Example—
Refer to Figure 9. In the three examples, it is assumed that the signal to the pump requires
about 35% to bring the pH value to the set point. In Figure 8a, the preset is at 0%, and the
gain is at 10. For these conditions, the steady state error is about
0.35 – 0
0.63pH =  --------------------- ( 18pH ) .
 10 
In Figure 8b, the gain is increased to 100, which reduces the error to about
0.35 – 0
0.063pH =  --------------------- ( 18pH ) .
 100 
In Figure 8c, the gain is reduced back to 10, but the preset is set to 30%. Having the preset
set closer to the required output reduces steady state error to about
0.35 – 0.30
0.09pH =  ----------------------------- ( 18pH ) .


10
The number 18 in the preceding equations represents the controller pH range of
-2 to 16 pH.
By using the integral action the steady state error is reduced to zero.
Figure 9
PID Controller Set Point/Error Measurement
51
4.3.1
Reset (Integral)
Please see Figure 8 for a diagram of the controller output response (integral only) to a step
change on the input. The integral action is used to drive the loop so that there is zero long
term error. For example, on a proportional controller where the steady state pH is too high,
the integral component of the output starts ramping up until the increased chemical feed
brings the pH down to the set point. The higher the setting, the faster the loop reaches
steady state, but it should not be set faster than the delay times in the loop. If the setting is
too high, the loop goes into oscillation (this generally tends to be a slower oscillation than
that caused by a gain or derivative setting that is too high). The integral action is turned off
by setting it to zero.
4.3.2
Rate (Derivative)
Please see Figure 8 for a diagram of the controller output response (derivative only) to a
step change on the input. The derivative action reacts to rate of change of the input and
attempts to counter fast changes. The derivative action is turned off by setting it to zero.
4.3.3
Curve
The curve mode entry has three settings (linear+, linear-, curve). For most applications
either linear+ or linear- is used. Linear+ is selected when the control pump is set up so that
an increasing controller output signal causes the pH to increase. Linear- is selected when
the control pump is set up so that an increasing controller output signal causes the pH to
decrease.
The use of the curve selection can improve the control loop if the characteristics of the
sample are repeatable over time. For optimal control, the loop gain (controller gain x
process gain) should remain constant, but for most samples the process gain changes over
the pH range.
Please see Figure 10. The process gain (defined as: ∆ pH /∆ % reagent addition) at point 1
through point 5 is represented by the slope of the line between each point and the setpoint.
For this example, the slope of the line (process gain) changes considerably depending on
the pH of the sample. If this curve is entered into the EC1000, the controller can
compensate for the change in process gain to keep the loop gain constant.
To implement the titration curve, take a sample of the process water, and titrate with the
reagent (acid and/or base used in the process). Record the pH value (Figure 11). Enter this
curve into the instrument as percent reagent addition vs. pH. The final step, after entering the
titration points, is to go back to the curve mode entry, and select the curve setting.
52
Figure 10
PID pH Process Gain
4
14
5
3
13
12
2
11
10
9
pH
1
8
Setpoint
7
6
5
4
3
2
1
10
20
30
40
50
60
70
80
90
100
REAGENT DEMAND %
The process gain seen by the controller is the slope of a line between
the setpoint and the pH measurement on the titration curve.
Figure 11
PID Titration Curve
pH
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
0
20
40
60
REAGENT DEMAND %
53
80
100
54
INSTALLATION/MAINTENANCE
Some of the following manual sections contain warning
labels and require special attention.
Read and follow all warning instructions carefully to avoid
personal injury and damage to the instrument. Only
qualified personnel should conduct maintenance
procedures on this instrument.
55
56
SECTION 5
INSTALLATION
5.1 Unpacking the Instrument
When removing the instruments from their shipping containers, inspect all units for any
damage that may have occurred during shipment. The containers include the EC1000
Controller, Pump Module, Electrode, Instruction Manual, installation kits for the
Controller and Pump Module, Pump Module maintenance kit, and electrolyte
(see REPLACEMENT PARTS on page 109). If damage is evident, or if the shipment is
incomplete, customers outside the U.S.A. should contact their local Hach Distributor.
Customers inside the U.S.A. should contact Customer Service in Loveland, Colorado.
Call toll-free 1-800-227-4224.
5.2 Industrial Process pH Electrode Preparation
Remove the electrode from the box and carefully remove the tape and protective cap from
the sensing end. Retain the protective cap for electrode storage. If salt crystals are present,
remove them by placing the sensing end of the electrode under a current of warm tap water
until the crystals dissolve. Keep the quick disconnect fitting dry. It is important to avoid
touching the internal area of the quick disconnect fitting. Contamination, such as oils and
salts from bare hands, can form a leakage path affecting the high impedance required
between the electrode and the controller.
5.3 Mounting the Controller
The controller is designed for panel, wall or pole mounting. All methods use a Mounting
Bracket (Cat. No. 43646-00). For dimensions and other mounting information see
Figure 12 on page 58 and Figure 13 on page 59.
5.3.1
Panel Mounting
Cut the panel before inserting the meter. The panel cutout is to be 5.50"x 5.50" ±0.05". For
panel mounting, remove the two mounting brackets, insert the meter into the panel, and
reattach the mounting brackets. See Figure 12 on page 58. Insert screws
(Cat. No. 5617-11) through mounting bracket inserts, and adjust for panel thickness.
57
Figure 12
Controller Installation/Panel Mount
58
5.3.2
Wall Mounting
For wall mounting, remove the two mounting brackets, reverse the brackets, and reattach
to the meter, see Figure 13. Secure the meter to the wall using screws or bolts
(not supplied) through the clearance holes in the mounting brackets.
5.3.3
Pole Mounting
For pole mounting, remove one of the mounting brackets. Open clamp (Cat. No. 43277-00)
and pass clamp end without screw around pole and through slot in mounting bracket.
Attach both ends of clamp and secure tightly to pole, see Figure 13. Reattach bracket to
the meter.
Figure 13
Controller Installation/Wall and Pole Mount
5.4 Mounting the Pump
Note: The pump module is
not used with the Industrial
pH Electrode.
The Pump Module can be placed on a bench top or wall mounted. To wall mount,
mounting blocks are secured to the four rear corners of the enclosure. The four blocks and
screws are supplied in the wall mounting kit (Cat. No. 44247-00). The mounting blocks
should be positioned as shown in Figure 14 on page 60 and fastened with the four screws
provided. Open the front cover of the pump module and insert one screw in each of the
four corner holes. Turn the screws into the mounting blocks using a long-shafted
screwdriver.
Screws or bolts to mount the pump module are not provided. Refer to Section 6.2.1
Assembling the Electrolyte Line, Section 6.2.2 Connection to the Pump Module, and
Section 6.2.3 Connection to the pH Electrode for plumbing the electrolyte tubing.
The pump is housed in a NEMA 4X/IP66 rated enclosure. The 1/16″ OD tubing strain relief
fitting is installed in a standard ½″ conduit hole and also can be replaced with a ½″ conduit
fitting for hard conduit. This is recommended to prevent damage to the 1/16″ OD electrolyte
supply tubing. The maximum tubing length between the electrode and the pump is 50 feet.
The standard configuration includes 20 feet of electrolyte supply tubing. For installations
that require 20 to 50 feet of tubing, order Hach Cat. No. 46399-00.
59
Figure 14
5.5
Pump Installation
Installing the pH/ORP Electrode
Note: Improve stability in
high purity water by
grounding the solution
near the electrode.
Different mounting equipment is available for the three configurations for mounting the
electrode. The electrode can be configured as an in-line unit installed in a full pipeline (see
Figure 15) or on the end of a dip tube as a submersible unit in a tank or other vessel. The
electrode also can be placed in a flow-thru cell for applications of flow with very little
pressure (see Figure 16). Maximum pressure is 35 psi for in-line installation or 40 feet of
immersion depth for submersible installation. Do not deviate orientation more than
90 degrees from vertical for the three types of installation. The configuration used
determines whether the bushing or collar is threaded with the reference tube and cable
prior to installation. Maximum temperature for the electrode is 60 °C.
60
Figure 15
Installing the pH/ORP Electrode
Figure 16
Flow-Thru Cell
61
5.5.1
In-Line Electrode Installation
A 1-½″ NPT fitting is required in line, which must be filled with the sample stream (see
Figure 15 on page 61). Orienting the electrode between 45 to 70° from the vertical helps
prevent air bubbles from interrupting the signal. Install the mounting collar into the 1-½″
fitting using Teflon tape or thread compound on the male threads. Place the compression
nut over the top of the electrode.
Note: Avoid electrode
damage and erroneous
measurements by closely
adhering to the maximum
pressure and temperature
specifications, see
SPECIFICATIONS on
page 9.
Do not use pipe compound or Teflon tape on the compression nut. Slip the o-ring over the
bottom of the electrode. Connect the reference tubing to the top of the electrode, with a
compression nut and ferrule (see Figure 25 on page 85, Detail A). Connect the cable to the
electrode through the quick disconnect coupling on the top of the electrode.
The electrode is now ready for installation into the mounting collar, but must be purged
and calibrated before operation (see SECTION 6 BASIC START-UP). When installing the
compression nut into the mounting collar, hand-tighten only.
For optimal performance, orient the reference outlet of the electrode downstream from the
glass sensor with respect to flow direction. The electrode check valve and stem are located
directly over the reference outlet.
5.5.2
Submersible Sensor Installation
Submersible sensors are typically installed on the end of a 1-½″ ID pipe having a 1-½″
NPT fitting (see Figure 15 on page 61). Install the mounting collar into the 1-½″ NPT
fitting using Teflon tape or pipe compound on the male threads. Run the electrode cable
and reference tubing through the mounting collar and pipe. Slide the o-ring over the top of
the electrode against the flange. Connect the reference tubing to the top of the electrode
with a compression nut and ferrule (see Figure 25 on page 85, Detail A). Connect the cable
to the electrode through the quick disconnect coupling on the top of the electrode. Place
the compression nut over the electrode and hand tighten into the mounting collar. (Do not
use Teflon tape or pipe compound on the compression nut). The electrode must be purged
and calibrated before operation (see SECTION 6 BASIC START-UP).
5.5.3
Flow-Thru Cell Installation
The flow-thru cell is mounted to the wall using screws or bolts (not provided) through the
two ¼-inch mounting holes (see Figure 16 on page 61). The inlet, located on the bottom of
the cell, is suitable for ¼-inch flexible tubing.
The inlet fitting can be removed and replaced with a ¼-inch NPT fitting suitable for rigid
tubing. The outlet, located on the side of the cell, is suitable for ½-inch flexible tubing.
The outlet fitting can be removed and replaced with a ½-inch NPT fitting suitable for rigid
tubing. The electrode is inserted from the top of the cell. The electrode must be wired,
purged, and calibrated before operation (see SECTION 6 BASIC START-UP).
62
5.6
Wiring the Meter
WARNING
Wiring connected in this
box must be rated at least
300Vrms/600Vpk.
ADVERTENCIA
Los cables de senalizacion conectados a esta caja deben tener una clasificacion de por lo menos
300Vrms/600Vpk.
ADVISO
A hacao dw sinal conectada nesta caixa deve ter classificaco de pelo menos 300Vrms/600Vpk.
ATTENTION
Le câblage de signalisation raccorde dans ce boîtier doit convenir pour une tension nominale
d'au moins 300Vrms/600Vpk.
WARNHINWEIS
Die diesem kasten angeschlossene signal verdrahtung mub nit mindestens 300Vrms/600Vpk
bemessen sein.
The meter wires are routed through three ½-inch conduit fittings located on the back of the
meter (see Figure 17). The left conduit hole (as viewed from the front of the meter) is for
alarm connections, the center conduit hole is for power connections and the right conduit
hole is for electrode, recorder, controller, and SIO connections. The left and right conduit
holes have molded-in knockouts, which must be removed if used. To maintain the NEMA
4X and IP66 ratings of the enclosure, the conduit fitting (not supplied) must be a sealing
type. To make the wire connections refer to Section 5.6.1 Wire Preparation. Remove the
front panel of the meter by removing the four corner screws. Disconnect the existing wires
from the front panel by unplugging the connector(s) (see Figure 18 on page 64).
Remove the wire shield. Unplug the connector from the circuit board on the front panel,
and hook up the wires. Replace the wire shield, routing the wires through the notches, and
verifying that the shield wire stays under the wire shield. Plug the connectors into the
circuit board, and replace the front panel of the meter.
Figure 17
Controller Inside Back Cover
63
Figure 18
5.6.1
Controller Circuit Board
Wire Preparation
Because low voltages (voltages <30Vrms) and primary voltage (115/230 Vac) are not
separable within the controller enclosure, it is necessary that all customer wiring be 300V
or more to assure adequate levels of insulation protection of low voltage wires from high
voltage circuits. Additionally, the recommended cable for signal wires (electrode,
recorder, controller, and SIO) is 22 AWG twisted pair shielded cable, which assures
compliance with RF immunity and emissions standards.
The alarm cable can be unshielded cable sized according to the load being used. Prepare
the cables as follows: Strip the outer jacket back 7 inches. Cut the shield wire to a length of
3 inches.
64
Table 7 Power Cord Color Code
5.6.2
North American
IEC
Line Conductor
Black
Brown
Neutral
White
Blue
Ground Conductor
Green
Green with Yellow Stripe
Power
WARNING
All electrical connections
should be made by a
qualified technician to
assure compliance to
all applicable electrical
codes. To meet UL, CSA
and other applicable
instrument safety
standards, an external
power disconnect switch
must be installed. This
power disconnect switch
should be located near the
instrument. Wiring for the
recorder and serial
interface connections
must be routed separately
from the alarm
connections and AC
power line for safe
operation. Separate
½-inch conduit openings
are provided for this
purpose. Shielded cables
may be required if cables
are not routed in
grounded metal conduit to
ensure emission's
compliance.
ADVERTENCIA
Todas las conexiones eléctricas deben ser realizadas por un técnico capacitado para asegurar el
cuplimiento con todos los códigos eléctricos. Para cumplir con las normas UL, CSA y otras
normas de seguridad aplicables a los instrumentos, debe instalarse un interruptor de
desconexión de la alimentación externa. El mismo debe estar ubicado cerca del instrumento. El
cableado para la grabadora y las conexiones de interfaz en serie deben encaminarse de manera
separada de las conexiones de la alarma y la línea de alimentación de CA para un
funcionamiento seguro. Se proporcionan aberturas separadas de conductos de ½ pulgada para
este propósito. Podrían requerirse cables protegidos si los mismos no están encaminados en
conductos metálicos conectados a tierra, para asegurar el cumplimiento con la emisión.
AVISO
Todas as conexões elétricas devem ser realizadas por técnico qualificado para garantir o
cumprimento de todas as normas elétricas aplicáveis. Para cumprir as especificações UL, CSA e
outras medidas de segurança padrãoaplicáveis ao instrumento, deve ser instalado um interruptor
externo para desligar a energia. Este interruptor desligador da energia deverá ser colocado perto
do instrumento. As instalações elétricas das conexões do registro e as entrefásicas em série
deverão estar separadas das conexões do alarme e da linha de CA, para que sua operação seja
segura. Eletrodutos de passagem de ½ polegada são fornecidos em separado para este propósito.
Caso os cabos não forem traçados por eletrodutos metálicos com ligação à terra, para garantir a
conformidade com as normas de irradiação, poderá ser necessário o uso de cabos blindados.
ATTENTION
Tous les branchements électriques doivent être effectués par un technicien qualifié, afin
d'assurer le respect de toutes les normes électriques applicables. Pour répondre aux normes UL,
CSA et à d'autres normes applicables concernant la sécurité de l'appareil, il est nécessaire
d'installer un interrupteur externe permettant de couper l'alimentation électrique. Cet
interrupteur doit être situé près de l'appareil. Le câblage pour l'enregistreur et les branchements
de l'interface série doivent être tirés séparément des branchements de l'alarme et du fil
d'alimentation électrique, afin d'assurer un fonctionnement sans risque. Des orifices de conduits
de ½ pouce séparés sont fournis à cet effet. Des câbles blindés peuvent être nécessaires si les
câbles ne sont pas tirés dans un conduit métallique relié à la terre, afin de respecter les normes
sur les émissions électro-magnétiques.
WARNHINWEIS
Um zu gewährleisten, daß alle elektrischen Anschlüsse den VDE-Vorschriften und
gegebenenfalls den Zusatzvorschriften der zuständigen Elektrizitätswerke sowie anderen
zutreffenden Sicherheitsnormen entsprechen, dürfen diese Anschlüsse nur von geschultem
Fachpersonal hergestellt werden. Um allen zutreffenden Sicherheitsbestimmungen für das Gerät
zu entsprechen, muß ein externer Netztrennschalter installiert werden. Dieser Netztrennschalter
sollte sich in unmittelbarer Nähe des Gerätes befinden. Die Verdrahtung für den Anschluß an
die Registriergerät-Schnittstellen sowie an die seriellen Schnittstellen ist aus
Betriebssicherheitsgründen getrennt von den Warnanschlüssen und der WS-Netzleitung zu
führen. Zu diesem Zweck sind separate Rohröffnungen mit einem Durchmesser von 0,5 Zoll
vorgesehen. Um zu gewährleisten, daß die Emmissionsbestimmungen erfüllt werden, sind
eventuell Abschirmkabel erforderlich, insofern di Kabel nicht in geerdeten Metallrohren
geführt werden.
65
The recommended size of the power supply leads is 18AWG, but can be in the range of
12AWG to 18AWG. The wires are routed through the center conduit hole and are hooked
up to the power connector (see Figure 17 on page 63). The power leads are twisted
together to fit in the compartment formed by the wire shield and the back of the case.
5.6.2.1
Line Voltage Selection for Meter
This instrument is factory set and properly fused for 115 Vac line requirements. To convert
the instrument for 230 Vac line requirements, proceed as follows:
Note: Misapplication of AC
line power to this
instrument can cause
damage to the instrument.
Prior to connection, verify
that the Volt Select Switch
is set for the proper AC
line requirement.
5.6.3
1. Rotate the indicator slot on the Volt Select Switch to the 230 V position (see Figure 18
on page 64).
2. Remove the 0.2A fuses, and replace them with appropriate type 0.1A fuses (refer to
Section 8.3 Fuse Replacement).
Alarms
The alarm relays have unpowered contacts, and the power to operate the load is supplied
by the user. Figure 19 shows a typical wiring configuration. The wires must be sized
according to the load used. For the maximum 5A load, the wires must be a minimum
of 16 AWG.
The wires are routed through the left conduit hole (see Figure 17 on page 63), and are
hooked up to J5 on the front panel (see Figure 18 on page 64). Maximum voltage is
30Vrms (42.4V pk).
Figure 19
5.6.4
Typical Wiring Configuration
Recorder and Controller
The recorder and controller connections are isolated 4-20 mA outputs and should be
connected with twisted pair shielded cable. The shield wire should be connected at the
instrument end only.
66
Note: Use a twisted-pair,
shielded cable. Use of
non-shielded cables may
result in radio wave
emission levels higher than
permitted under the
compliance
regulations listed.
5.6.5
The wires are routed through the right conduit hole (see Figure 17 on page 63) and are
hooked up to J1 and J3 on the front panel (see Figure 18 on page 64). The shield wire is
connected inside the back cover (see Figure 17 on page 63). For voltage output, a resistor
across the recorder input lines is needed. The resistor must be connected only if the
recorder requires a 0 to 10 V, 0 to 1 V, or 0 to 100 mV input. The resistor must be
connected at the recorder input terminals, not at the EC1000 output terminals. Ordinary
5% or 10% tolerance resistors are acceptable, as the controller’s output can be trimmed to
provide the proper voltage. Use a 1/4 watt resistor for a 0 to 10 V signal. Use a 1/8 watt
resistor for 0 to 1 V or 0 to 100 mV signals. Use a 500 ohm resistor for 0 to 10 V signal.
Use a 50 ohm resistor for 0 to 1 V signal. Use a 5 ohm resistor for 0 to 100 mV signal. The
controller’s 4 mA output must be trimmed to 0 mA.
Refer to Section 2.2.2 Recorder Output.
Electrode Wiring
Be sure the power is turned off to the controller. The electrode cable has a quick
disconnect coupling on one end which attaches to the electrode body. Route the electrode
cable into the controller through the right conduit hole (see Figure 17 on page 63). There
are four color coded wires and a shield wire inside the electrode cable. The color coded
wires are connected to the only four-pin removable plug in the controller J2 connector
as follows:
Note: The shield must be
connected to provide a
stable electrical signal
between the electrode
and the meter.
5.6.6
white--pin 1 / green--pin 2 / black--pin 3 / red--pin 4
The shield wire is connected inside the back cover (see Figure 17 on page 63). The
electrode cable can be wired directly to an optional junction box that is permanently
wired to the controller. The junction box has eight blank terminals located behind the
inside cover.
Electrode Output Connections
IMPORTANT NOTE: Turn off power to the pH/ORP Analyzer before disconnecting the
electrode at the quick disconnect. Failure to do so may result in permanent electrode damage.
Note: The shield must be
connected to provide a
stable electrical signal
between the electrode
and the meter.
If the measuring instrument is within 6 m (20 feet) of the electrode, the output cable is
supplied for the final connection. If the distance is greater than 6 m (20 feet), use the four
conductor cable, Cat. No. 46894-00, and junction box, Cat. No. 47122-00. Both cables
contain four conductors and a quick disconnect fitting. Refer to Section 5.6.5 Electrode
Wiring and to the table below for additional wiring information.
ELECTRODE
PREAMPLIFIER
White
pin #1
Green
pin #2
Black
pin #3
Red
pin #4
67
5.7
Pump Wiring
WARNING
All electrical connections
should be made by a
qualified technician to
assure compliance to all
applicable electrical
codes. To meet UL, CSA
and other applicable
instrument safety
standards, an external
power disconnect switch
must be installed. This
power disconnect switch
should be located near the
instrument. Wiring for the
recorder and serial
interface connections
must be routed separately
from the alarm
connections and AC
power line for safe
operation. Separate ½inch conduit openings are
provided for this purpose.
Shielded cables may be
required if cables are not
routed in grounded metal
conduit to ensure
emission's compliance.
ADVERTENCIA
Todas las conexiones eléctricas deben ser realizadas por un técnico capacitado para asegurar el
cuplimiento con todos los códigos eléctricos. Para cumplir con las normas UL, CSA y otras
normas de seguridad aplicables a los instrumentos, debe instalarse un interruptor de
desconexión de la alimentación externa. El mismo debe estar ubicado cerca del instrumento.
El cableado para la grabadora y las conexiones de interfaz en serie deben encaminarse de
manera separada de las conexiones de la alarma y la línea de alimentación de CA para un
funcionamiento seguro. Se proporcionan aberturas separadas de conductos de ½ pulgada para
este propósito. Podrían requerirse cables protegidos si los mismos no están encaminados en
conductos metálicos conectados a tierra, para asegurar el cumplimiento con la emisión.
AVISO
Todas as conexões elétricas devem ser realizadas por técnico qualificado para garantir o
cumprimento de todas as normas elétricas aplicáveis. Para cumprir as especificações UL, CSA
e outras medidas de segurança padrão aplicáveis ao instrumento, deve ser instalado um
interruptor externo para desligar a energia. Este interruptor desligador da energia deverá ser
colocado perto do instrumento. As instalações elétricas das conexões do registro e as entrefásicas
em série deverão estar separadas das conexões do alarme e da linha de CA, para que sua
operação seja segura.Eletrodutos de passagem de ½ polegada são fornecidos em separado para
este propósito. Caso os cabos não forem traçados por eletrodutos metálicos com ligação à terra,
para garantir a conformidade com as normas de irradiação, poderá ser necessário o uso de
cabos blindados.
ATTENTION
Tous les branchements électriques doivent être effectués par un technicien qualifié, afin
d'assurer le respect de toutes les normes électriques applicables. Pour répondre aux normes UL,
CSA età d'autres normes applicables concernant lasécurité de l'appareil, il est nécessaire
d'installer un interrupteur externe permettant de couper l'alimentation électrique. Cet
interrupteur doit être situé près de l'appareil. Le câblage pour l'enregistreur et les branchements
de l'interface série doivent être tirés séparément des branchements de l'alarme et du fil
d'alimentation électrique, afin d'assurer un fonctionnement sans risque. Des orifices de conduits
de ½ pouce séparés sont fournis à cet effet. Des câbles blindés peuvent être nécessaires si les
câbles ne sont pas tirés dans un conduit métallique relié à la terre, afin de respecter les normes
sur les émissions électro-magnétiques.
WARNHINWEIS
Um zu gewährleisten, daß alle elektrischen Anschlüsse den VDE-Vorschriften und
gegebenenfalls den Zusatzvorschriften der zuständigen Elektrizitätswerke sowie anderen
zutreffenden Sicherheitsnormen entsprechen, dürfen diese Anschlüsse nur von geschultem
Fachpersonal hergestellt werden. Um allen zutreffenden Sicherheitsbestimmungen für das Gerät
zu entsprechen, muß ein externer Netztrennschalter installiert werden. Dieser Netztrennschalter
sollte sich in unmittelbarer Nähe des Gerätes befinden. Die Verdrahtung für den Anschluß an
die Registriergerät-Schnittstellen sowie an die seriellen Schnittstellen ist aus
Betriebssicherheitsgründen getrennt von den Warnanschlüssen und der WS-Netzleitung zu
führen. Zu diesem Zweck sind separate Rohröffnungen mit einem Durchmesser von 0,5 Zoll
vorgesehen. Um zu gewährleisten, daß die Emmissionsbestimmungen erfüllt werden, sind
eventuell Abschirmkabel erforderlich, insofern di Kabel nicht in geerdeten Metallrohren
geführt werden.
The power leads for the pump are routed through the ½-inch conduit fittings located on the
side of the pump module (Figure 20). To maintain the NEMA 4X rating of the enclosure,
the conduit fitting (not supplied), must be a sealing type. To make the wire connections,
open the front cover and remove the electrical cover by removing the four corner screws.
The recommended size of the power supply leads is 18 AWG, but must be in the range of
12 AWG to 18 AWG. The insulation must be rated at least 300Vrms/600Vpk. The power
supply leads are hooked up to the power connector J1. The power leads are twisted
together to fit in the compartment formed by the electrical cover and the circuit board.
68
Figure 20
5.7.1
Pump Module and Electrical Connections
Line Voltage Selection for Electrolyte Pump
Note: Misapplication of AC
line power to this
instrument can cause
damage to the instrument.
Prior to connection, verify
that the Voltage Select
Switch is set for the proper
AC line requirement.
This instrument is factory set and properly fused for 115 Vac line requirements. To convert
the instrument for 230 Vac line requirements, proceed as follows:
1. Slide the actuator to the 230 V position (Figure 20).
2. Remove fuses F1 and F2 (Figure 20) and replace them with 0.1A fuses (refer to
Section 8.3 Fuse Replacement).
69
70
SECTION 6 BASIC START-UP
Note: This section is not used for the Industrial pH Electrode (Cat. No. 48276-00).
6.1 Introduction
In the following sections the various preliminary tasks necessary to make the Process
pH/ORP System operational are defined in their recommended sequence. Once these
preliminary steps are performed, and the controller is programmed to the desired settings,
the system is ready for operation. The same procedure can be applied to ORP installations.
6.2 Adding Electrolyte
Process pH reference electrolyte (Cat. No. 24291-49 or 24291-17) is recommended for use
with the Hach Process pH Electrode and the Hach One Process ORP Electrode. One bottle
(500 mL) of electrolyte lasts over one month. The electrolyte timer gives a warning of low
electrolyte 30 days after the timer is set. See Section 2.2.7 Reference Solution Timer for
setting the timer for operation.
6.2.1
Assembling the Electrolyte Line
Use the entire length of Teflon tubing supplied with the system for best performance.
Excess tubing should be coiled up. Prepare the Teflon tubing as follows:
1. Make a square cut at the two tubing ends, using a razor or cutter blade. DO NOT use
scissors or cutting pliers that cause a permanent loss of shape of the tubing end.
2. Thread the Teflon tubing through a rigid conduit for better tubing protection.
6.2.2
Connection to the Pump Module
1. Thread the Teflon tubing into the pump module through the strain relief bushing
supplied in the pump module installation kit. See Figure 26 on page 89.
2. Loosen the four plate screws over the pump face and remove the plate.
3. Install the pump tubing assembly in the pump (with 3-way stopcock underneath the
pump) and reinstall the pump plate by tightening the four screws by small steps to
obtain an even tension. The screws should be hand tightened, do not use a tool to
tighten. Make sure the pump tubing is correctly aligned in the center of the pump.
4. Connect the electrolyte reservoir tubing on the fitting at the top of the pump tubing.
5. Fully unscrew the male fitting of the connector under the 3-way stopcock
(Priming Tee).
6. Thread the Teflon tubing into the male fitting under the 3-way stopcock. Next, thread
the Teflon tubing into the ferrule with the cone pointing to the male fitting (refer to the
instruction card supplied by the vendor for the ferrule).
7. Push the Teflon tubing with the ferrule completely in the female fitting under the
3-way stopcock. Screw on the male fitting and tighten by hand only.
6.2.3
Connection to the pH Electrode
Note: Make sure to thread
the electrolyte tubing into
the part of the mounting kit
that is to be placed above
the electrode arrest ring
(collar and O-ring for
the immersion kit or
compression fitting for
the in-line kit).
1. Using the second ferrule and male compression fitting supplied in the installation kit,
prepare the second Teflon tubing end in the same manner used in Section 6.2.2
Connection to the Pump Module, Steps 6 and 7.
2. Unscrew and remove the protective plug on the pH electrode head. Push the Teflon
tubing with ferrule into the electrode head. Screw on the compression fitting and
tighten by hand only (see Figure 25 on page 85).
71
6.3 Purging the System
1. Remove the storage cap from the electrode.
2. Loosen the four screws on the face of the pump to allow fluid through the
pump tubing.
3. Connect the syringe (with the plunger all the way in) to the side port of the
priming tee.
4. Turn the priming tee handle to the FILL position (Figure 21 [Fill]).
5. Withdraw about 3 mL of electrolyte. Expel about 0.5 mL of electrolyte to clear any
trapped air bubbles in the tee. Turn the priming tee handle to the PURGE position
(Figure 21 [Purge]). With the syringe still attached, tighten the four pump head
screws. Be sure the tube through the pump runs straight across the fingers, and is
not pinched permanently closed.
6. Purge all the air from the electrode line by holding the electrode up-side-down and
pushing electrolyte through with the syringe (Figure 21 [Purge]).
Do not push air back into the system. Turn the priming tee handle to the RUN position
(Figure 21 [Run]).
7. Disconnect the syringe.
8. Turn the pump on and look for fluid flow out of the electrode.
Note: If any air bubbles are
detected, purge
the system.
9. Reset electrolyte time (see Section 2.2.7 Reference Solution Timer).
72
6.4 Calibration
See Section 2.3 Calibration.
Figure 21
Priming Tee Operation
73
74
SECTION 7 SERIAL INTERFACE
7.1
Installation
WARNING
Wiring connected in this
box must be rated at least
300Vrms/600Vpk.
ADVERTENCIA
Los cables de senalizacion conectados a esta caja deben tener una clasificacion de por lo menos
300Vrms/600Vpk.
ADVISO
A hacao dw sinal conectada nesta caixa deve ter classificaco de pelo menos 300Vrms/600Vpk.
ATTENTION
Le cablage de signalisation raccordé dans ce boîtier doit convenir pour une tension nominale
d'au moins 300Vrms/600Vpk.
WARNHINWEIS
Die diesem kasten angeschlossene signal verdrahtung mub nit mindestens 300Vrms/600Vpk
bemessen sein.
Note: Assembly and repair
must occur at an
electrostatic discharge
(ESD) safe workstation at
which the work surface,
tools, and operator are
properly grounded. ESD
can cause damage to the
electronics module,
including possible damage
to the microprocessor and
memory chips.
1. Determine the desired mode of operation and set the jumpers as needed (see
Figure 22).
2. Disconnect power to the meter.
3. Remove the front panel of the meter by removing the four corner screws. Disconnect
the existing wires from the front panel by unplugging the connector(s) (see Figure 18
on page 64).
4. Attach the serial interface board as shown in Figure 18 on page 64 and fasten with
three 6-32 screws.
5. Determine the wiring configuration (see Figure 22). Prepare wires by stripping the
outer jacket back 7 inches, and then cutting the shield wire to 3 inches.
Note: Use a twisted-pair,
shielded cable. Use of
non-shielded cables may
result in radio wave
emission levels higher than
permitted under the
compliance
regulations listed.
6. Remove the wire shield (see Figure 17 on page 63) by removing the two screws. Route
the wires through the correct conduit fitting.
7. Connect the shield wires to the shield connection (see Figure 17 on page 63). Unplug
the RS-232 connector from the circuit board on the front panel, and hook up the wires
(see Figure 18 on page 64).
8. Replace the wire shield by routing the wires through the notches, and verifying that
the shield wire stays under the wire shield. Plug the connectors into the circuit board,
and replace the front panel of the meter.
75
Figure 22
RS-232C Interface Configuration
1 2
3
4 5 6 7
TB1
1
13
Host Computer
25 CKT D-Subminiature Female
Connection
PIN 1 (SHLD) Note 1
PIN 3 (RXD)
PIN 2 (TXD)
PIN 7 (COM)
PIN 4 (RTS) to PIN 5 (CTS)
TB1-2 (TXD)
TB1-3 (RXD)
TB1-1 (COM)
14
25
Host Computer
PIN 6 (DSR) to PIN 20 (DTR)
PINS 8-19, 21-25 NOT USED
25 CKT D-Subminiature Female
Note 1: Shield ground is normally tied at one end of
cable only to prevent ground looping.
1 2
3
4 5 6 7
TB1
5
Host Computer
9 CKT D-Subminiature Female
Connection
TB1-2 (TXD)
TB1-3 (RXD)
TB1-1 (COM)
PIN 2 (RXD)
PIN 3 (TXD)
PIN (COM)
PIN 7 (RTS) to PIN 8 (CTS)
PIN 6 (DSR) to PIN 4 (DTR)
PINS 1, 9 Not Used
9
6
Host Computer
9 CKT D-Subminiature Female
1 2
3
4 5 6 7
TB1
1
13
Connection
Citizen Printer
25 CKT D-Subminiature Male
TB1-2 (TXD)
TB1-1 (COM)
PIN 1 (SHLD) Note 1
PIN 3 (RXD)
PIN 7 (COM)
Note 1: Shield ground is normally tied at one end of
cable only to prevent ground looping.
76
14
25
Citizen Printer Connection
25 CKT D-Subminiature Male
7.2 RS-232C Interface Configuration
The RS-232C interface configuration is suitable in cases where the distance between the
analyzer and an external device is relatively short (50 feet or less). Longer distances make
the interface connection vulnerable to electrical interference and data transmission errors.
For distances longer than 50 feet use the current loop configuration. To select the RS-232C
format, jumper No. 2 must be set to the closed position and jumper No. 1 must be open
(Figure 22, and Table 8).
Table 8 Jumper Settings for RS-232C
1
2
3
4
open
closed
open
open
Jumper No.
Position
Note: Shield ground is
normally tied at one end
of cable only (prevents
ground looping).
Connections are made at TB1 on the serial interface board (Figure 18 on page 64 and
Figure 22). For typical RS-232C connections from the instrument to an IBM personal
computer, and the two most common cable configurations, see Figure 22.
Note: If the lines can be
disabled through hardware
or software, then this
jumper is
not needed.
If some other system is used to communicate with the instrument, see Table 6 on page 47
and Table 9 for generic cable configuration and definition of terms. Because there is no
handshaking with the pH meter, the RTS and CTS lines must be jumpered at the host
computer. The DSR and DTR lines also must be jumpered at the host computer. If these
lines can be disabled through hardware or software at the host computer, the jumpers are
not required.
Table 9 Dip Switch Descriptions
Jumper No.
Function
1
Selects current loop interface
2
Selects RS-232C interface
3
Selects analyzer as the output voltage source in current loop mode
4
Selects analyzer as the input source in current loop mode
7.3 Current Loop Configuration
A current loop interface configuration is used to transmit data over longer distances via a
twisted-pair cable with each pair individually shielded.
The current loop interface mode is selected by placing jumper No. 1 in the closed position
and jumper No. 2 in the open position (Figure 23 and Table 10). X’s are based on current
loop sourcing; see Table 11. Connection in the current loop configuration is made using
posts 4 through 7 of TB1 on the circuit board. There is no standard format for connector
pin use in a current loop configuration; the user must wire connectors and cables as
required for the individual installation.
Table 10 Jumper Settings for Current Loop
Jumper No.
Position
1
2
3
4
closed
open
X
X
In the recommended connection configuration, the voltage source for both the input and
output loops is provided by the external computer or printer interface. This configuration
provides an optical isolation between the analyzer and the current loop. In the second
connection configuration, the analyzer is set up to provide both of the voltage sources.
77
Table 11 Current Loop Customer Connection Box
Post No.
Description
Function
7
Current loop in (+)
Data input loop, positive
8
Current loop in (-)
Data input loop, negative
9
Current loop out (+)
Data output loop, positive
10
Current loop out (-)
Data output loop, negative
This configuration does not provide the isolation that may be required at the computer or
printer interface. Table 9 explains the function of each of the individual jumper closures.
Table 12 RS-232C Cable Configuration
pH/ORP Meter
TB1Connection
Host Computer/Printer
Connection
TB1-3 (TXD)
(RXD)
TB1-2 (RXD)
(TXD)
TB1-1 (COM)
(COM)
(RTS) to (CTS)*
(DSR) to (DTR)*
* If the lines can be disabled through hardware or software, then
this jumper is not needed.
Table 13 RS-232C Line Signal Definitions
Signal Name
Description
TXD
Transmitted Serial Data (Output)
RXD
Received Serial Data (Input)
RTS
Request To Send (Output). This signal requests permission to transmit data.
Hardware handshaking uses this signal.
CTS
Clear To Send (Input). This signal indicates the equipment is ready to receive
data. Hardware handshaking uses this signal.
DSR
Data Set Ready (Input). This signal indicates that the remote equipment has a
data block ready to transmit. Hardware handshaking uses this signal.
DTR
Data Terminal Ready (Output). This signal indicates that the equipment has a
data block ready to transmit. Hardware handshaking uses this signal.
COM
Signal Ground (Common Return)
SHLD
Protective Ground used for shielding
78
Figure 23
Recommended Current Loop Hookup
Current Source
20 mA Source
7
6
1
Computer or
Printer Receiver
Current Source
20 mA Source
5
Computer
Transmitter
4
Current Loop Configuration
With Analyzer Providing Current Sources*
Current Source
7
Computer or
Printer Receiver
6
1
Current Source
5
4
Computer
Transmitter
*Note: The analyzer is not isolated from the current loop in this configuration.
79
80
SECTION 8 ELECTRODE AND PUMP MAINTENANCE
Note: Pump Module is not used with the Industrial pH Electrode (Cat. No. 48276-00).
8.1 Electrode Maintenance
8.1.1
General Electrode Maintenance
The measuring glass portion of the electrode is not greatly affected if the unit is stored dry
for short periods of time. The electrode will rehydrate upon reinstallation, however, it may
take five minutes or more to rehydrate completely, depending on the sample conditions.
For longer periods of time outside the sample stream, store the reference portion of the
electrode in Electrode Storage Solution (Cat. No. 50301-49). If the reference junction
dries out, rehydrate by soaking in a pH 4 buffer with KCl for about eight hours. If the
junction is not completely rehydrated, the electrode will suffer slow response times and a
possible inefficiency of slope.
Handle the electrode carefully to protect the pH-sensitive membrane. One way to protect
the membrane is to have the protective cap in place whenever the electrode is removed
from the process stream. If the electrode is to remain out of the process stream for more
than on hour, make sure the cotton in the protective cap is saturated with Electrode Storage
Solution (Cat. No. 50301-49). If a conditioning solution is not available, use pH 4.01 or
7.00 buffers or tap water.
8.1.2
Removing Existing Electrode
Note: Avoid permanent
electrode damage by
shutting off the EC1000
Analyzer before
disconnecting the
electrode at the
quick disconnect.
1. Turn off power to the EC1000 Analyzer.
2. Turn off power to the electrolyte pump.
3. Disconnect the electrode cable and reference tubing from the electrode body.
4. Unscrew the electrode from the Hach Process pH/ORP Cell Holder, and remove the
bushing or collar from the old electrode.
5. Place a new sensor assembly onto the new electrode body, as described below.
6. Place the bushing or collar on the new electrode so that it is positioned in the same
way as it was on the previously used electrode.
7. Connect the electrode cable.
8. Connect the electrode reference tube to the electrode check valve with the
compression nut and ferrule. Finger tighten only.
8.1.3
Sensor Replacement
The replaceable sensor assembly (pH or ORP) is screwed into the threaded hole on the
bottom of the electrode body (see Figure 24). Be sure both the inside of the hole and the
sensor are dry before attaching. A cotton swab is included with the sensor to clear the
hole of any moisture and debris. Two o-rings are required to make the seal. Use the
plastic sensor wrench to tighten the sensor assembly. The plastic loading nut of the sensor
assembly should be flush with the end of the electrode body when properly seated.
1. With the sensor wrench, remove the old sensor. Clear debris and old o-rings from
the socket using a cotton swab (make sure the o-rings have been removed from
the electrodes).
2. Rinse the sensor socket with deionized water and dry it with a clean cotton swab.
3. Rinse the pin end of the new sensor with deionized water and carefully dry it with the
cotton swab.
81
4. Screw the new sensor assembly into the electrode body using the sensor wrench. Two
o-rings are required for proper seating. Make sure the loading nut is flush with the end
of the electrode body (see Figure 24).
8.1.4
Replacing Electrolyte
One 500-mL bottle of electrolyte lasts over one month. The reservoir volume is 700 mL.
When replenishing electrolyte for an existing electrode, clean and calibrate the electrode.
If you are replenishing electrolyte in the reservoir that has not emptied completely,
the system does not require purging. If the reservoir electrolyte dropped to a level that
introduced air into the electrolyte tubing, the system requires purging (see Section 8.1.6
Purging the System).
82
Figure 24
Sensor Replacement
83
8.1.5
Crystal Formation in Reference Tube
The electrolyte solution for the reference portion of the electrode contains 1.5N KCl in
40% glycerol in water solution. Should some portion of the electrode dry out, crystals
may interfere with the free flow of electrolyte. These deposits are easily removed by
disassembling the check valve (see Figure 25 on page 85) and immersing the entire
electrode and tube in hot water (approximately 45 °C/100 °F) for three to five minutes.
After the blocked areas are immersed for several minutes, reassemble the electrode. Take
the syringe full of electrolyte and attach it to the priming tee. Turn the priming tee handle
to the purge position (see Figure 21 on page 73). Push out several milliliters of electrolyte,
and reconnect the electrode to the pump. Turn the priming tee handle to the run position
(see Figure 21 on page 73).
8.1.6
Purging the System
1. Remove the storage cap from the electrode.
2. Loosen the four screws on the face of the pump to allow fluid to flow through the
pump tubing.
3. Connect the syringe (with the plunger all the way in) to the side port of the
priming tee.
4. Turn the priming tee handle to the FILL position (see Figure 21 on page 73 [Fill]).
5. Withdraw about 3 mL of electrolyte. Expel about 0.5 mL of electrolyte to clear any
trapped air bubbles in the tee. Turn the priming tee handle to the PURGE position (see
Figure 21 on page 73 [Purge]). With the syringe still attached, tighten the four pump
head screws. Be sure the tube through the pump runs straight across the fingers, and is
not pinched closed.
Note: If air bubbles are
detected, re-purge
the system.
6. Purge all the air from the electrode line by holding the electrode up-side-down and
pushing electrolyte through with the syringe (see Figure 21 on page 73 [Purge]) Do
not push air back into the system. Turn the priming tee handle to the RUN position
(see Figure 21 on page 73 [Run]).
7. Disconnect the syringe.
8. Turn the pump on and look for fluid flow out of the electrode.
9. Reset electrolyte time (see Section 2.2.7 Reference Solution Timer).
8.1.7
Storage and Conditioning
8.1.7.1
pH Electrode Storage and Conditioning
For best results, attach the pH sensor and condition for at least one hour in buffer or
sample with the reference electrolyte pump on. Recalibration after the first day of use is
recommended. If the electrode is taken out of use and stored, flush the reference line with
deionized water using the syringe and luer lock adapter. Using the syringe, blow out the
deionized water with air. Store the electrode wet in reference electrolyte.
8.1.7.2
ORP Electrode Storage and Conditioning
Attach the sensor and clean the electrode in 1M HCl for 15 minutes before use.
Recalibration after the first day of use is recommended. If the electrode is taken out of use
and stored, flush the reference line with a syringe filled with deionized water. Blow out the
deionized water with air using the same syringe. Store the electrode wet in
reference electrolyte.
84
Figure 25
Hach One pH Process Electrode
85
8.1.7.3
Industrial pH Electrode Shelf Life and Storage
Rotate and check electrode stock once a year. Prolonged storage on the shelf can cause the
reference electrode to dry out. To avoid this, perform a routine maintenance as follows:
1. Remove the electrode from its storage box and remove the cap.
2. Rinse away any crystals.
3. Saturate the cotton in the protective cap with Electrode Storage Solution (Cat. No.
50301-49).
4. Replace the cap on the electrode.
5. Wrap tape around the joint of the cap edge and the electrode body.
6. Replace the electrode in its storage box and mark the date on the box.
Store the electrode between 0 °C (32 °F) and 50 °C (122 °F).
8.1.8
pH Electrode Cleaning
WARNING
The hydrochloric acid
(HCl) and sodium
hydroxide (NaOH)
used in the procedure
may be hazardous if
inappropriately handled
or accidentally misused.
Read all warnings on the
Material Safety Data
Sheets (MSDS) and
reagent labels.
ADVERTENCIA
El ácido clorhídrico y el hidróxido de sodio que se usan en este procedimiento pueden ser
peligrosos si se usan impropiamente, debido a mal manejo o accidente. Lea toda la informatción
de la Hoja de Datos de Seguridad para este material, y las advertencias en las etiquetas de
los reactivos.
AVISO
O ácido clorídrico e o hidróxido de sódio usados neste procedimento podem ser perigosos se
forem manipulados incorrectamente ou fortuitamente mal utilizados. Leia todas as advertências
e informação das Folhas de Dados de Segurança de Material (FDSM) nas etiquetas do reagente.
ATTENTION
L'acide chlorhydrique et l'hydroxyde de sodium utilisés dans cette procédure peuvent être
dangereux s'ils sont manipulés de façon inappropriée ou accidentellement mal utilisés. Lire
toutes les informations de la fiche de données de sécurité et les avertissements sur les étiquettes
des réactifs.
WARNHINWEIS
Die in diesem Verfahren verwendeten Salzsäuren und Natriumhydroxide können im Falle einer
ungeeigneten Behandlung oder eines zufälligen Mißbrauchs gefährliche Folgen haben.
Beachten Sie bitte alle Materialsicherheits-Datenblätter und die Warnungen auf
der Reagensetikette.
When the electrode response becomes sluggish, the electrode may be fouled or the
glass bulb may be contaminated. Clean or recondition the electrode. Normal cleaning
or reconditioning of the electrode is accomplished in the following steps. Immerse the
electrode tip in 0.1N HCl for two minutes. Follow by immersion in 0.1 N NaOH and again
in 0.1N HCl, each for a two-minute period. Rinse with water, and soak in water for at least
15 minutes. Oils and fats can be removed by immersing the electrode tip in a detergent
solution such as Alconox (Cat. No. 20880-00). Use a brush or ultrasonic bath if necessary.
Avoid scratching the glass bulb. Organic films may be removed from the glass bulb by
using an appropriate solvent, such as methanol or acetone.
86
8.1.9
ORP Electrode Cleaning
Fouling of the platinum sensing element of the ORP electrode can cause sluggish response
and drift. To clean the electrode, soak it in 1N HCl for 15 minutes. Recalibrate before
replacing it in the sample.
8.1.10
Industrial pH Electrode Cleaning
Some process streams contain materials that adhere to the glass of the electrode.
Frequency of required cleaning is determined from experience with the sample stream
being tested. Loose or lodged debris can usually be removed by placing the electrode
under a flowing spigot or the jet of a wash bottle.
Wipe the glass membrane gently with a soft, wet cloth or a paper tissue. Never use
abrasive cleaners on the glass membrane. Remove oil deposits by cleaning in a solution of
liquid dishwashing detergent and warm water. Do not use ammonia or ammoniacontaining cleaning solutions. If necessary, use 1% HCl or other dilute acid solution to
clean the glass. Do not leave the electrode in the acid for more than 30 seconds. Always
wash the electrode thoroughly with a mild detergent after cleaning with acid, then rinse in
deionized water. After cleaning with an acid solution, allow the electrode to soak for an
hour in a neutral (pH 7.00) buffer solution
The plastic housing can be cleaned with almost any mild detergent.
8.2 Pump Maintenance
8.2.1
Changing Pump Tubing
Under ambient pressures and temperatures, the pump tubing should give at least 3 to 6
months of useful service. Though the rate of electrolyte dispensed decreases over time,
this is not critical. As long as some electrolyte is flowing, the reference junction should
remain cleared. Check for pump tubing failure by observing the reference outlet tube of
the electrode while the pump is running and the priming tee is in the RUN position.
A full drop of electrolyte should appear in less than 5 minutes (5 pumps).
If it does not appear, purge the system (see Section 8.1.6 Purging the System) to make sure
the reference line is not clogged. Replace the tubing if the reference line is clear (see
Figure 26 on page 89).
1. Cut a section of the replacement pump tubing (Part No. 43623-00) to 3.5 inches.
2. Remove the pulse dampener by disconnecting it from the pump tubing. Shake the fluid
out of the pulse dampener.
3. Disconnect the pump tubing at the inlet side.
4. Loosen the four plate screws over the pump face.
5. Pull out the old tubing and install the new tubing.
6. Reconnect the tubing and pulse dampener.
7. At this point, proceed as you would for purging the system (see Section 8.1.6 Purging
the System).
87
8.3
Fuse Replacement
WARNING
For continued protection
against fire, replace
fuses with only fuses
of specified type and
current rating.
ADVERTENCIA
Para una continua protección contra incendios, reemplace los fusibles únicamente por los del
tipo y capacidad recomendados.
AVISO
Para proteçao contínua contra fogo, troque os fusíveis somente por fusíveis do tipo especificado
para a força da corrente.
ATTENTION
Pour assurer la protection contre les risques d'incendies, remplacez les fusibles uniquement par
des fusibles du même type et pour la même intensité.
WARNUNG
Zur Wahrung des kntinuierlichen Brandschutzes durfen die Sicherungen nur mit Sicherungen
des gleichen Typs und mit gleichen Stromkennwerten verwendet werden.
8.3.1
Meter Fuse Replacement
Note: UL/CSA type fuses
are required for use in
North America, and IEC
type fuses are required for
use in Europe.
One of the fuses is located on the power supply board (see Figure 18 on page 64). The
second fuse is located inside the back cover (see Figure 17 on page 63).
1. To replace the fuses, disconnect power to the meter.
2. Remove the front panel of the meter by removing the four corner screws.
3. Disconnect the wires from the front panel by unplugging the connector(s).
4. Remove the wire shield.
5. Remove the power supply board fuse from the fuse holder using a screwdriver.
6. Remove the back panel fuse by pulling the fuse from the fuse clips.
7. Replace the fuses with 0.2A fuses for 115 V operation or 0.1A fuses for
230 V operation.
8. Reverse the above instructions to reassemble the meter.
88
Figure 26
Pump Module Plumbing Diagram
89
8.3.2
Pump Fuse Replacement
Note: UL/CSA type fuses
are required for use in
North America, and IEC
type fuses is required for
use in Europe.
The fuses are located on the circuit board under the electrical cover (see Figure 20 on page
69). To replace the fuses, disconnect power to the pump and remove the electrical cover by
removing the four corner screws (see Figure 20 on page 69). There are three fuses on the
board. Both sides of the power line are fused with F1 and F2. Replace these two fuses with
0.2A fuses for 115 V operation or 0.1A fuses for 230 V operation. Fuse F3 is replaced
with a 0.5A fuse for either line voltage operation.
8.4 Pump Motor Replacement
1. Turn the power switch off and disconnect all power to the pump assembly!
2. Open the pump cover by loosening the two thumb screws on the right-hand side of
the cover.
3. Remove the pump tubing from the pump assembly and replace the pump cover so no
parts are lost.
4. Remove four screws from the electronics cover inside the pump enclosure.
5. Disconnect the two wires that lead to the pump motor from the terminal strip labeled
J2 on the circuit. The terminal strip is located on the upper right hand side of the
circuit board.
6. Remove the two screws that attach the pump assembly to the inside of the enclosure.
7. Remove the pump assembly from the enclosure.
8. Locate the two screws that attach the pump motor to the pump assembly and carefully
remove them, being careful not to lose the two nuts in the pump housing.
9. Carefully remove the motor and bracket from the pump assembly. Set the old motor
aside and align the shaft pin on the new motor with the cam in the pump assembly.
10. Rotate the motor until the mounting holes on the motor align with the slots on the
pump assembly.
11. Making sure the mounting nuts are still in the pump housing, install the new motor
and the bracket removed in Step 8 onto the pump assembly.
12. Install the two screws removed in Step 6.
13. Install the pump assembly into the enclosure and replace the two mounting screws.
14. Reconnect the two motor wires to the terminal strip connector labeled J2 on the upper
right hand side of the circuit board, replace the electronics cover and secure it with the
four screws removed in Step 4.
15. Remove the pump cover and place the pump tubing back into the pump assembly.
Replace the pump cover and evenly tighten the four thumb screws.
16. Reconnect the power source.
90
SECTION 9 TROUBLESHOOTING
9.1 Troubleshooting the EC1000 Controller
9.1.1
Test Diagnostic Menu
The diagnostic menu is a special menu for troubleshooting and setting the user
programmable keyboard lockout code. The menu is entered from the normal operating
mode (displaying pH or mV) by pressing both ENTER and CLEAR at the same time. Once
entered, the user can scroll through the following menu entries:
Note: Entry into the diagnostics menu is not allowed if the keyboard is locked.
See Section 2.2.6 Keylock.
DISPlay TeST: Pressing ENTER at this menu entry runs the display through a sequence of
test patterns to determine if the displays are functioning correctly.
The test patterns are as follows:
1. All LEDs on.
followed by:
2. All LEDs off.
3. A * scrolling through the main display.
4. An 8 scrolling through the lower display.
5. The display stepping through the digits 0, 1,2...9
ReLaY TeST: Pressing ENTER at this menu entry runs the relays through sequence
operations to determine if the relays are functioning correctly.
The relay operation can be checked two ways. The first is to listen for six relay clicks. For
an additional check, check the relay contacts with a digital volt meter (DVM). The relay
sequence is as follows:
1. Close all relays.
2. Open all relays.
3. Close the Alarm 1 relay.
4. Close the Alarm 2 relay.
91
5. Close the System Warning relay.
6. Open all relays.
SIO TeST: Pressing ENTER at this menu entry runs a serial I/O loop test.
To run this test, connect the serial output back to the serial input (Note: The output to input
connection can be made at any point, depending on how much of the system is tested.)
This test sends out an ASCII string, and then checks to see if the same string is received.
RECorder TeST: The sub-menus under this entry are ZERO, FS, and ½ FS.
These entries test the recorder output end points and linearity by outputting recorder zero,
full scale, and ½ full-scale.
ConTRoLler TeST: The sub-menus under this entry are ZERO, FS, and ½ FS.
These entries test the controller output endpoints and linearity by outputting controller
zero, full scale, and ½ full-scale.
Figure 27
Jumper for D/A Test
1
2
J3
1
2
3
4
J2
1
2
J1
Note: A special jumper
must be added for this test
(Figure 27).
D/A-A/D loop TEST: This test does a bit weight D/A - A/D loop test.
A good test displays OK followed by 512 +2. A bad test displays FAILED.
CALibration DeFaulTs: The sub-menus under this entry restore the factory defaults for
the pH electrode calibration, the temperature electrode calibration, or the mV offset.
COLD StaRT: This entry restores all variables except input calibration data to
default values.
KEYboard LOCKout code: This entry changes the keyboard lockout code.
Pressing ENTER brings up an edit display of KEY=1234, with the first digit flashing.
Note: The actual number in the display is the current keyboard lockout code.
After the number is edited to the desired code, press ENTER to accept the new keyboard
lockout code.
Note: If the calibration is outside of an acceptable range, an error message is displayed and the
calibration is not accepted.
92
INPut CALibration: This entry calibrates the 4 to 20 mA inputs for the pH electrode and
temperature electrodes.
The four submenu entries are 4MA PH, 20MA PH, 4MA TEM, and 20MA TEM. The
calibration is done as follows: A 4 mA source is connected to the pH input. Select the
4MA PH menu entry, and press ENTER to accept the calibration.
The display returns to the 20MA PH display. Continue with the remaining three steps.
93
9.1.2
Error Codes
Table 14 Error Codes
Error
Code
Display
E00
EEFAIL
EEPROM
failure
E01
REF TIME
Reference
Indicates the reference electrode needs Refill the electrolyte (see Section 8.1.4
timer time-out refilling. Occurs 30 days after last reset. Replacing Electrolyte) and clear the warning
(see Section 2.2.8 Warnings).
E02
SOFT SRT
Software
restart
The microprocessor enters an
abnormal operating mode, and internal
diagnostics resume normal operation.
Clear the warning (see Section 2.2.8 Warnings).
If E02 occurs frequently, call the service
department.
E03
COLD SRT
Cold start
Requested from the diagnostic menu
(Section 9.1.1 Test Diagnostic Menu) or
new software installed. Returns all
settings and calibrations to factory
defaults.
Clear the warning (see Section 2.2.8 Warnings).
Re-enter the operator settings, and re-calibrate
the electrode.
E04
PROBE ER
pH probe
open
The electrode wiring is disconnected,
or the electrode is defective.
Determine, then resolve the problem with the
electrode by referring to Section 9.2
Troubleshooting the pH Electrode. The warning
will self clear when the problem is resolved
E05
PROBE ER
pH probe
shorted
The electrode wiring is shorted, or the
electrode is defective.
Determine, then resolve the problem with the
electrode by referring to Section 9.2
Troubleshooting the pH Electrode. The warning
will self clear when the problem is resolved
E06
PROBE ER
Temperature
probe open
The electrode wiring is disconnected,
or the electrode is defective.
Determine, then resolve the problem with the
electrode by referring to Section 9.2
Troubleshooting the pH Electrode. The warning
will self clear when the problem is resolved
E07
PROBE ER
Temperature
probe
shorted
The electrode wiring is shorted, or the
electrode is defective.
Determine, then resolve the problem with the
electrode by referring to Section 9.2
Troubleshooting the pH Electrode. The warning
will self clear when the problem is resolved
E08
MARG CAL
Marginal pH
offset
Calibration is outside the normal range.
During a calibration, a marginal pH
offset warning is set if the required
offset is greater than ±100 mV.
Recalibrate the instrument or clean or replace
the electrode. The warning will self clear when
the problem is resolved, or it may be cleared
manually (see Section 2.2.8 Warnings).
E09
MARG CAL
Marginal pH
gain
During a calibration, a marginal pH gain
warning is set if the required slope is
outside the range of 50.6 to 71.2 mV.
Recalibrate the instrument or clean or replace
the electrode. The warning will self clear when
the problem is resolved, or it may be cleared
manually (see Section 2.2.8 Warnings).
E10
MARG CAL
Marginal
temperature
offset
During a calibration, a marginal
temperature offset warning is set if the
required offset is greater than ±20 °C.
Recalibrate the instrument or clean or replace
the electrode. The warning will self clear when
the problem is resolved, or it may be cleared
manually (see Section 2.2.8 Warnings).
E11
MARG CAL
Marginal
temperature
gain
During a calibration, a marginal
temperature gain warning is set if the
required offset is greater than ±20 °C.
Recalibrate the instrument or clean or replace
the electrode. The warning will self clear when
the problem is resolved, or it may be cleared
manually (see Section 2.2.8 Warnings).
E12
PWR FAIL
Power failure
The power to the instrument has been
shut off since the last time this warning
was reset.
Clear the warning (see Section 2.2.8 Warnings).
Error
Description
Probable Cause
Corrective Action
One or more of the data cells either
fails to program or losses data.
NOTE
In the case of loss of data, internal
diagnostics automatically restore
the data.
Clear the warning (see Section 2.2.8 Warnings).
Cycle power off, then on and check system
warnings. A recurring E00 warning indicates
EEPROM damage. Replace the microprocessor
circuit board. Frequent E00 indicates EEPROM
may be near failure. Replace the
microprocessor circuit board.
94
9.1.3
System Warnings
Table 15 System Warnings
Display
Error Description
Probable Cause
Corrective Action
ROM ER**
ROM failure
The instrument ROM failed.
Replace the microprocessor board.
RAM ER
RAM failure
The instrument RAM failed.
Replace the microprocessor board.
MARGINAL
Marginal calibration
During a calibration, the required pH offset
is greater than ±100 mV; the required pH
slope is outside the range of 50.6 to
71.2 mV; or the required temperature offset
is other than +20 °C.
Recalibrate the instrument or clean or
replace the electrode.
INVALID
Invalid keyboard
entry
A wrong key was pressed during
programming or calibration or the value
entered is outside the acceptable range.
Review the procedure to determine the
correct entry. Redo calibration
or programming.
LOCKED
Keyboard lockout
The keyboard was locked during
programming or calibration.
Unlock the keyboard (see Section
2.2.6 Keylock).
H
(flashing in the
first display
location)
Output Hold
The output hold function has been enabled
and the recorder, controller, and alarm
outputs are held for 30 minutes (Refer to
Table 1 on page 19).
None
*
(in the first display
location)
Solution TC
The solution temperature compensation is
active. (Refer to Section 2.2.5 Initial Setup)
None
Alarm LED’s
flashing
Alarm Ack
The alarm acknowledge function is active.
This function disables the alarms for 30
minutes. (Refer to Table 1 on page 19).
None
95
9.2 Troubleshooting the pH Electrode
Table 16 pH Electrode Troubleshooting*
Symptom
Probable Cause
Corrective Action
The electrode does
not calibrate
The wiring to the controller
is incorrect.
Check the electrode cable to controller wiring (see Section 5.6.5 Electrode
Wiring). Make sure the wire connectors are contacting the metal wires and
not the wire insulation.
Air in the reference lines.
Verify that electrolyte is exiting the electrode reference outlet. Wipe the end
of the electrode dry, and observe the reference outlet tube with the pump
running and the priming tee in the RUN position. A full drop of electrolyte
should become visible within 5 minutes (5 pumps). If a drop does not
appear, purge the system (see Section 6.3 Purging the System) (also see
Symptom: No electrolyte flow).
pH sensor is internally
shorted.
Remove the pH sensor. Verify that two O-rings are being used. Inspect the
O-rings for damage and replace if necessary. Completely dry both the
inside of the socket and sensor assembly. Reinstall. (Refer toSection 8.1.3
Sensor Replacement).
The calibration procedure
is incorrect.
Calibrate again using the correct procedure (refer to Section 2.3
Calibration). Use only Hach buffers when in the AUTO calibration mode. If
other buffers are used, use the MANUAL calibration mode (refer to Section
2.3 Calibration).
The glass bulb is broken.
(evidenced by reading the
same potential in two
different buffers)
Reconfirm that the buffers are different before making this judgment.
Replace the pH sensor bulb.
The controller is defective.
Check the controller with the Test Plug provided in the installation kit.
• Turn off the power to the controller.
• Remove the electrode plug connector from the controller and replace it
with the Test Plug.
• Turn on the power to the controller.
• The controller should read from -350 to 350 mV and 40 to 60 °C if
functioning properly.
If not functioning properly, replace the controller.
Reference has become
poisoned. (This is often
preceded by an E08 error
message which becomes an
INVALID error message.)
Replace electrode.
Air in reference lines.
Verify that electrolyte is exiting the electrode reference outlet. Wipe the end
of the electrode dry and observe the reference outlet tube with the pump
running and the priming tee in the RUN position. If a full drop of electrolyte
does not become visible within 5 minutes (5 pumps), purge the system (see
Section 6.3 Purging the System) (also see Symptom: No electrolyte flow).
Air in the sample line.
If a pocket of air passes over or gets trapped at the end of the electrode, the
reading becomes momentarily erratic. This usually is remedied by
reorienting the electrode so that air bubbles do not block the sensor (see
Section 5.5 Installing the pH/ORP Electrode).
The pH reading is being
taken on the reference
electrolyte instead of the
solution being measured.
This is typified by an
oscillating pH reading with a
period of about one minute.
most commonly happens
when testing high purity
water.
Orient the reference outlet so it is downstream of the pH glass bulb.
Or, increase the rate of flow past the electrode.
The pH glass bulb is broken
Replace the pH sensor. (See Section 8.1.3 Sensor Replacement).
Streaming potential
Ground the solution near the electrode (especially in high purity water).
The pH readings
are erratic.
96
Table 16 pH Electrode Troubleshooting* (continued)
Symptom
Probable Cause
Corrective Action
The response
is slow.
The electrode is fouled. The
sample coated the pH glass
bulb with a solid film.
Clean the pH glass bulb (see Section 8.1.8 pH Electrode Cleaning).
The sample is cold and/or of
low ionic strength.
Raise the temperature of the sample.
The electrode has insufficient
conditioning.
Condition a new or dry electrode for at least one hour in the process
sample. Perform a grab sample calibration after conditioning.
The reference electrolyte is
not flowing out of the
electrode.
Verify that a full drop of reference electrolyte forms within 5 minutes at the
end of the reference outlet tube of the electrode. If this does not occur, refer
to the next Symptom: There is no electrolyte flow.
No electrolyte flow. Pump tubing is pinched off.
Be sure pump tubing runs straight across pump fingers and is not pinched
against the black pump body. (See Section 8.2.1 Changing Pump Tubing).
Long term drift in
the pH reading.
Excessive use of
electrolyte.
The priming tee is in the
wrong position.
Verify that the priming tee is in the RUN position (Figure 21 on page 73).
The reference electrolyte
bottle is empty.
Refill the electrolyte bottle with Process pH Reference Electrolyte (Cat. No.
24291-00). Purge the system (see Section 6.3 Purging the System).
Air in the reference line.
Purge the system (see Section 6.3 Purging the System).
The pump tubing is worn out.
To verify, remove the priming
tee, and turn on the pump.
Within 5 minutes a drop of
electrolyte should form at the
end of the tube exiting
the pump.
Replace the pump tubing (see Section 8.2.1 Changing Pump Tubing). May
be required every three months.
The reference line is clogged
(evidenced by the inability to
force electrolyte out of the
electrode reference outlet
during purging).
Determine if the clog is in the electrode or the Teflon reference tubing by
disconnecting the compression nut and ferrule from the electrode
electrolyte inlet. Purge the system (see Section 6.3 Purging the System). If
the clog is in the reference tubing, disconnect the priming tee and reference
tubing from the pump tubing, and soaking it in hot tap water. Blow the clog
free with a syringe. Replace the tubing if this does not work.
The electrode is clogged.
Unclog by attaching the syringe luer lock adapter, found in the maintenance
kit, to the reference inlet of the electrode. Fill the syringe with water, and
attach it to the adapter. Remove the reference outlet screw with a small
screw driver. (see Figure 25 on page 85) Apply pressure to the syringe until
water drips out of the reference tube outlet. If this does not free the clog,
soak the electrode in hot tap water overnight and repeat the above process.
If the clog remains, replace the electrode.
Leaks in the reference line
(evidenced by puddles of wet
crystals in the pump
enclosure, at the electrode
reference inlet, or along the
Teflon reference tubing).
Tighten all fittings. If a leak occurs at a compression nut and ferrule fitting,
be sure the ferrule is correctly oriented (see Figure 25 on page 85,
Detail A). Leaks also may indicate a clogged system.
Pump plate screws not tight.
Tighten screws securely to pump face.
(See Section 8.2.1 Changing Pump Tubing)
* Note: The Industrial pH Electrode does not include an electrolyte pump, disregard symptoms associated with the electrolyte pump.
97
9.3 Troubleshooting the ORP Electrode
Table 17 Troubleshooting the ORP Electrode
Symptom
Probable Cause
Corrective Action
mV reading does
not correspond to
cited mV value for
standard.
Reference electrode/preamp
offset. The Ag/AgCl reference
half cell uses a 1.5 M KCl in
40% glycerol electrolyte
solution. This has a potential
of 32 +10 mV versus SCE. In
addition, the electrode
preamp can contribute a +35
mV offset. (See Table 2 on
page 27).
Zero the preamp. See Section 2.3.3.1 Preamp Zero.
Fouled sensor
Clean electrode in 1 M HCl. (See Section 8.1.8 pH Electrode Cleaning)
ORP sensor is internally
shorted
Remove ORP sensor. Inspect it for wetness inside the glass stem. If wet,
replace. If dry, verify that two O-rings are being used, inspect them for
damage and replace if necessary. Completely dry both the inside of the
electrode socket and outside of the sensor assembly. Reinstall. (Refer to
Section 8.1.3 Sensor Replacement).
Reference has become
poisoned
Flush with large amounts of reference electrolyte. If this is not successful,
replace the entire electrode.
Air in the reference line
Verify that electrolyte is exiting the reference outlet. Wipe the end of the
electrode dry, and observe the reference outlet tube with the pump running
and the priming tee in the RUN position. A full drop of electrolyte should
become visible within 5 minutes (5 pumps). If a drop does not appear,
purge the system (see Section 6.3 Purging the System) (also see
Symptom: No electrolyte flow).
Air in the sample line
If a pocket of air passes over or gets trapped at the end of the electrode, the
reading becomes momentarily erratic. This usually is remedied by
reorienting the electrode so that air bubbles do not block the sensor
(see Section 5.5 Installing the pH/ORP Electrode).
ORP Sensor is broken.
Remove the ORP sensor from the electrode body and inspect it for wetness
within the glass stem (see Section 8.1.3 Sensor Replacement) If wet,
replace sensor. If dry, verify that two O-rings are being used, inspect them
for damage and replace if necessary. Completely dry both the inside of the
electrode socket and outside of the sensor assembly. Reinstall. (Refer to
Section 8.1.3 Sensor Replacement).
The mV readings
are erratic.
There is no
electrolyte flow.
See Section 9.2 Troubleshooting the pH Electrode
98
Table 18 Diagnostic Test Menu
Key
Option
Sub Menu
Description
(Press ENTER
and CLEAR
simultaneously
for Diagnostic
Menu)
DISP TST
NONE
Perform a display pattern test
RLY TEST
NONE
Perform a relay open/close test
SIO TEST
NONE
Perform a SIO loop-back test
REC TEST
ZERO
Drive recorder output to full scale
FS
Drive recorder output to zero
1/2 FS
Drive recorder output to 1/2 scale
ZERO
Drive controller output to zero
CTRL TST
FS
Drive controller output to full scale
1/2 FS
Drive controller output to 1/2 scale
D/A TEST
NONE
D/A - A/D loop test (jumper must be installed)
CAL DFT
PH DFT
Sets the pH probe calibration to default values
MV DFT
Sets the mV offset to the default of zero
TEMP DFT
Sets the temperature probe calibration to default values
COLD SRT
NONE
Perform a cold start
KEYLOCK
.NONE
Set keyboard lockout code
INP CAL
4MA MV
Calibrate 4 mA input current loop on mV input
20 MA MV
Calibrate 20 mA input current loop on mV input
4 MA TEM
Calibrate 4 mA input current loop on temperature input
20 MA TEMP
Calibrate 20 mA input current loop on temperature input
99
Table 19 Setup Menu
Key
Option
SETUP
ALARMS
Description
ALARM 1 (AL)
ALARM 2 (AL)
RECORDER
Mode (rEC)
WINDOW (rEC)
OUT TRIM (rEC)
CONTROL
(see INIT SET
OUTPUT 2)
MODE (AL1)
Alarm 1 mode (ph high/low, mV high/low,
temperature high/low
SET PNT (AL1)
Alarm 1 setpoint for pH (-2.00 to +16.00 PH), mV (-2000.0 to
+2000.0 MV) and temperature (-5.00 to +105 °C)
HYST (AL1)
Alarm 1 Hysteresis for pH (+0.01 to +2.00 PH), mV (+1.0 to
+100.0 MV) and (+0.1 to +2.0 °C)
DLY TIME (AL1)
Alarm 1 delay time (0 to 30 SECS)
MODE (AL2)
Alarm 2 mode (ph high/low, mV high/low,
temperature high/low
SET PNT (AL2)
Alarm 2 setpoint for pH (-2.00 to +16.00 PH), mV (-2000.0 to
+2000.0 MV) and temperature (-5.00 to +105 °C)
HYST (AL2)
Alarm 2 Hysteresis for pH (+0.01 to +2.00 PH), mV (+1.0 to
+100.0 MV) and (+0.1 to +2.0 °C)
DLY TIME (AL2)
Alarm 2 delay time (0 to 30 SECS)
Recorder output mode (pH, mV, temperature)
MINIMUM (rEC)
Lower limit of recorder in terms of pH (-2.00 to +16.00 PH),
mV (-2000.0 to +2000.0 MV) and temperature
(-5.00 to +100 °C)
MAXIMUM (rEC)
Upper limit of recorder in terms of pH (-2.00 to +16.00 PH),
mV (-2000.0 to +2000.0 MV) and temperature
(-5.00 to +100 °C)
O TRIM (rEC)
Trim recorder zero (in terms of mA output)
FS TRIM (rEC)
Trim recorder full scale (in terms of mA output)
MODE (Con)
Controller mode (pH/mV)
SET PNT (Con)
Controller setpoint for pH (-2.00 to +16.00 PH),
mV (-2000.0 to +2000.0 MV)
DEAD BND (Con)
Controller dead band for pH (+0.00 to +2.00 PH),
mV (000.0 to +100.0 MV)
PRESET (Con)
Preset output for controller (0.0 to 100%)
GAIN (Con)
Controller gain (0.00 to 99.99)
RESET (Con)
Controller reset action (0.00 to 99.99/HR)
RATE (Con)
TITR CUR (Con)
OUT TRIM (Con)
RECORD 2
MODE (rEC)
WINDOW (rEC)
OUT TRIM (rEC)
Controller rate action (00.00 to 99.99 MIN)
MODE (Cur)
Titration curve type (LINEAR+, LINEAR-, CURVE)
POINTS (Cur)
Data point entry for titration curve
O TRIM (Con)
controller
FS TRIM (Con)
controller
Recorder output mode (pH, mV)
MINIMUM (rEC)
Lower limit of recorder in terms of pH (-2.00 to +16.00 PH),
mV (-2000.0 to +2000.0 MV)
MAXIMUM (rEC)
Upper limit of recorder in terms of pH (-2.00 to +16.00 PH),
mV (-2000.0 to +2000.0 MV)
O TRIM (rEC)
Trim recorder zero (in terms of mA output)
FS TRIM (rEC)
Trim recorder full scale (in terms of mA output)
100
Table 19 Setup Menu (continued)
Key
Option
Setup
(cont.)
INIT SET
Description
C COMP (Inl)
SERIAL (Inl)
KEY LOCK
MODE ( °C)
Type of temperature compensation (automatic, manual)
SET PNT ( °C)
Temperature setpoint for manual temperature compensation
(-5.0 to +105 °C)
SOL TC
Solution temperature compensation (- 0.1 pH to + 0.1 pH)
BAUD (SEr)
Baud rate of serial I/O (300, 600, 1200, 2400, 4800, 9600)
PARITY (SEr)
Parity of serial I/O (odd, even, none)
DATA BIT (SEr)
Number of data bits of serial I/O (7/8)
STOP BIT (SEr)
Number of stop bits of serial I/O (7/8)
PRT DLY (SEr)
Enabled or Disabled
PRT INTR (SEr)
Print interval (00 to 99 MIN) (0 turns print interval off)
PRT LST (SEr)
Print a listing
OUTPUT 2
Output #2 Setup (Control, Record 2)
SIG AVG (Inl)
pH signal average value (00 to 10 SECS)
M UNLOCK (LoC)
Momentarily unlock the keyboard (30 minute time-out)
UNLOCK (LoC)
Unlock the keyboard
LOCK (LoC)
Lock the keyboard
REF SOLN
TMR RST (rEF)
Reset the reference solution timer
WARNINGS
DISP WRN
Display system warnings
CLR WARN
Clear system warnings
Table 20 Calibration Menu
Key
Option
CAL
STD 1 (CAL)
STD 2 (CAL)
(Appears only after
STD 1 is completed)
Description
AUTO STD (SD 1)
pH calibration point 1 with auto regulation of buffer value
MAN STD (SD 1)
pH calibration point 1 with manual entry of buffer value
AUTO STD (SD 2)
pH calibration point 2 with auto regulation of buffer value
MAN STD (SD 2)
pH calibration point 2 with manual entry of buffer value
GRAB SMP (CAL)
REVIEW (CAL)
TEMP (CAL)
pH calibration using a grab sample
OFFSET (CAL)
Display pH electrode offset calibration
SLOPE (CAL)
Display pH electrode slope calibration
STD 1 (CAL)
Display pH and mV value—use for cal point 1
STD 2 (CAL)
Display pH and mV value—use for cal point 2
TEMP 1 (CAL)
Temperature calibration point 1
TEMP 2 (CAL)
Temperature calibration point 2 (appears only after TEMP 1
is completed)
MV ZERO (CAL)
User input mv offset
101
102
GENERAL INFORMATION
At Hach Company, customer service is an
important part of every product we make.
With that in mind, we have compiled the following
information for your convenience.
107
108
REPLACEMENT PARTS
EC1000 PROCESS pH STRUCTURE AND ACCESSORIES
Description
Cat. No
EC1000 pH System with Flat Bulb Electrode...................................................................................................... 46400-01
EC1000 pH System with Round Bulb Electrode ................................................................................................. 46400-00
EC1000 ORP System with ORP Electrode .......................................................................................................... 48270-00
EC1000 pH System with Industrial Electrode .....................................................................................................48200-00
Each EC1000 pH/ORP system includes:
EC1000 Controller
Installation Kit, Pump Module
Pump Module
Electrolyte, 4/pkg
Instruction Manual
Replacement Instruction Sheet
Installation Kit, Controller
pH Electrode, Flat or Round Bulb, or ORP electrode
MOUNTING KITS
Description
Cat. No.
Submersible Mounting Kit ................................................................................................................................... 46401-00
In-Line Mounting Kit ...........................................................................................................................................46402-00
Flow-Thru Cell Mounting Kit .............................................................................................................................. 46403-00
OPTIONAL ACCESSORIES
Description
Cat. No.
Ampule Breaker (for Light’s Solution Ampules)................................................................................................. 21968-00
Extension Cable, Quick Disconnect on both ends (20 ft.) (6 m) ......................................................................... 49550-00
Four Conductor Cable (per ft.) ............................................................................................................................. 46894-00
Junction Box......................................................................................................................................................... 47122-00
Teflon Tubing Kit, 15.24 m (50 ft.)...................................................................................................................... 46399-00
Power Cord, 125V (7 ft.), with strain relief UL/CSA (for 115 Vac line)............................................................. 46306-00
Power Cord, 230V (7 ft.), with strain relief with Continental European Plug, IEC ............................................ 46308-00
RS-232C Kit......................................................................................................................................................... 46326-00
Quick Disconnect Cable, Male on one end, unterminated on the other end (20 ft.) (6 m) .................................. 48263-00
REPLACEMENT PARTS
Description
Cat. No.
Barb Fitting, 1/16″ .................................................................................................................................................. 31002-00
Cable, Zeroing, for ORP electrode.......................................................................................................................48277-00
Check Valve.......................................................................................................................................................... 46863-00
Circuit Board Assembly, Display......................................................................................................................... 46322-00
Circuit Board Assembly, Power Supply............................................................................................................... 46324-00
Compression Fittings, 1/16″ (electrode) ................................................................................................................. 43631-00
Compression Nut (for electrode mounting kit) .................................................................................................... 46861-00
Coupling, ¼″ ........................................................................................................................................................ 43615-00
CPVC Tee Fitting (1.5″ NPT) .............................................................................................................................. 45338-00
EC1000 Controller Installation Kit ...................................................................................................................... 46404-00
EC1000 System Manual....................................................................................................................................... 48275-18
Electrolyte Pump Motor (motor only).................................................................................................................. 43624-00
Electrolyte Pump and Motor Replacement Kit .................................................................................................... 30468-00
Electrolyte Reservoir Bottle ................................................................................................................................. 46310-00
Ferrule, 1/16″ .......................................................................................................................................................... 43634-00
Filter, For Electrolyte Bottle................................................................................................................................. 44953-00
Fitting, Male Luer Lock, ¼″................................................................................................................................. 43633-00
Fuse, 100 mA, 250V, Slow Blow (T), IEC (for 230 Vac line) ............................................................................. 44787-00
Fuse, 100 mA, 250V, Slow Blow (T), UL/CSA (for 230 Vac line)...................................................................... 46371-00
109
REPLACEMENT PARTS (continued)
Description
Cat. No.
Fuse, 200 mA, 250V, Slow Blow (T), UL/CSA (for 115 Vac line) ..................................................................... 46353-00
Fuse, 500 mA, 250V, Slow Blow (T), UL/CSA (for transformer secondary) ..................................................... 46354-00
Installation Kit, Pump Module ............................................................................................................................ 46405-00
Maintenance Kit, Pump Module ......................................................................................................................... 46406-00
Mounting Collar................................................................................................................................................... 46860-00
o-ring for sensor (2) ............................................................................................................................................. 48208-00
o-ring, for electrode mounting kit (flow cell) ...................................................................................................... 40214-00
ORP Electrode ..................................................................................................................................................... 48300-00
ORP Glass Sensor................................................................................................................................................ 48261-00
pH Electrode with cable, Bulb............................................................................................................................. 48250-00
pH Electrode with cable, Flat .............................................................................................................................. 48250-01
pH Electrode without cable, Bulb........................................................................................................................ 48280-00
pH Electrode without cable, Flat ......................................................................................................................... 48280-01
pH Electrode without cable, Industrial, Flat ........................................................................................................ 48276-00
pH Glass Sensor, Bulb ......................................................................................................................................... 48253-00
pH Glass Sensor, Flat........................................................................................................................................... 48254-00
Pulse Dampener/Bubble Trap Assembly ............................................................................................................. 30483-00
Stopcock, Priming "T"......................................................................................................................................... 43637-00
Strain Relief Grip, 1/16″ (for electrolyte tubing) ................................................................................................... 43617-00
Syringe, 10cc ....................................................................................................................................................... 22024-00
Tubing, Polyurethane (per ft.) (for pump module) .............................................................................................. 43623-00
Tubing, Teflon, 1/16″ OD (per ft.) (electrolyte reservoir) ...................................................................................... 44989-00
Tubing, Polyethylene, 1/16″ ID (per ft.)................................................................................................................. 45524-00
Wrench, sensor..................................................................................................................................................... 48264-00
ELECTROLYTE AND STANDARDS
Description
Cat. No.
Buffer pH 4.0 Powder Pillows (pk 50) ................................................................................................................ 22269-66
Buffer pH 7.0 Powder Pillows (pk 50) ................................................................................................................ 22270-66
Buffer pH 10.0 Powder Pillows (pk 50) .............................................................................................................. 22271-66
Buffer Solution pH 4.0 (473 mL) ........................................................................................................................ 12223-11
Buffer Solution pH 7.0 (473 mL) ........................................................................................................................ 12222-11
Light’s Solution ORP Standard ............................................................................................................................ 26125-20
Process pH Electrolyte (500 mL)......................................................................................................................... 24291-49
Process pH Electrolyte (500 mL) pk 4................................................................................................................. 24291-04
Process pH Electrolyte (3.78 liters) ..................................................................................................................... 24291-17
EC1000 Controller Installation Kit.................................................................................................................. 46404-00
Includes:..................................................................................................................................................... Qty
Fuse 0.100A, 250V Slow-Blow (T), UL/CSA ........................................................................................... 1
Fuse 0.100A, 250V Slow-Blow (T), IEC ................................................................................................... 1
Mounting kit including: .............................................................................................................................. 1
screws 10 - 32 x 1 SST Phil .................................................................................................................... 4
clamps, Worm Drive Hose 3- ½ SST ...................................................................................................... 2
Test plug, mV/temperature simulator (connector equipped with 2 resistors)............................................. 1
110
pH Electrolyte Pump Installation Kit............................................................................................................... 46405-00
Includes: .............................................................................................................................................. Qty
Buffer, pH 4.01 Powder pillow pK/50 ................................................................................................. 1
Buffer, pH 7.00 Powder pillow pK/50 ................................................................................................. 1
Electrolyte Reservoir Bottle Assembly with polyethylene tubing 1/16″ I.D. and Foot Strainer............ 1
Ferrule PTF-200 1/16″ O.D. .................................................................................................................. 2
Fitting, compression PTF-203, 1/16″ O.D. ............................................................................................ 2
Pump Tubing Assembly with 3-way stopcock and connectors ........................................................... 1
Strain Relief Grip ................................................................................................................................. 1
Syringe, 10 cc....................................................................................................................................... 1
Tubing, Teflon 1/16″ O.D. (20 ft.) .......................................................................................................... 1
pH Electrolyte Pump Maintenance Kit............................................................................................................ 46406-00
Includes: .............................................................................................................................................. Qty
Coupling, ¼″ ........................................................................................................................................ 1
Ferrule, PTF-200, 1/16 O.D. ................................................................................................................... 2
Filter, Foot Strainer, 149 Micron ......................................................................................................... 1
Fitting, Barb, 1/16″ ................................................................................................................................. 1
Fitting, Barb, 1/16″ ................................................................................................................................. 1
Fitting, Cprs, 1/16″ OD, Tubing ¼″........................................................................................................ 2
Fitting, Male Luer Lock, ¼″ ................................................................................................................ 2
Stopcock, 3-Way Luer Lock ................................................................................................................ 1
Syringe, 10cc Luer-Lock Tip ............................................................................................................... 1
Tubing, Polyurethane, 1/8″ (38 cm/15 inches)....................................................................................... 1
111
112
HOW TO ORDER
By Phone:
6:00 a.m. to 5:00 p.m. MST
Monday through Friday
(800) 227-HACH (800-227-4224)
By Mail:
Hach Company
P.O. Box 389
Loveland, Colorado 80539-0389 U.S.A.
By Telex:
160840 (Hach Loveland)
By FAX:
(970) 669-2932 (Hach Loveland)
Information Required
• Hach account number (if available)
• Billing address
• Shipping address
• Your name and phone number
• Purchase order number
• Catalog number
• Brief description or model number
• Quantity
Technical and Customer Service
Hach Technical and Customer Service Department personnel are eager to answer
questions about our products and their use and to take your orders. Specialists in
analytical methods, they are happy to put their talents to work for you.
Call 1-800-227-4224.
International Customers
Hach maintains a network of dealers and distributors throughout the world. In Europe,
Mediterranean, Africa and the Middle East, customers can contact their local
distributor or obtain help from:
Hach Europe, S.A./N.V.
Chaussée Namur, 1
B-5150 Floriffoux (Namur), Belgium
Telephone: (32) (81) 44.71.71
FAX: (32) (81) 44.13.00
In Canada
Hach Sales and Service Canada Ltd.
1313 Border Street, Unit 34
Winnipeg, Manitoba R3H 0X4
Telephone: (204) 632-5598
FAX: (204) 694-5134
Hach Company World Headquarters
P. O. Box 389
Loveland, Colorado, U.S.A. 80539-0389
Telex: 160840
Telephone: (1) (970) 669-3050
113
REPAIR SERVICE
For instrument service, please contact the Hach Service Center serving your location.
In the United States:
Hach Company
100 Dayton Ave.
Ames, Iowa 50010
(800) 227-4224 (USA only)
Phone: (515) 232-2533
FAX: (515) 232-1276
In Canada:
Hach Sales & Service Canada Ltd.
1313 Border Street, Unit 34
Winnipeg, Manitoba
R3H 0X4
(800) 665-7635 (Canada only)
Telephone: (204) 632-5598
FAX: (204) 694-5134
In Latin America, the Caribbean, the Far East, the Indian Subcontinent, Africa
(except Mediterranean Africa) or Pacific Basin:
Hach Company World Headquarters,
P.O. Box 389
Loveland, Colorado 80539-0389 U.S.A.
Telephone (970) 669-3050
Telex: 160840
FAX: (970) 669-2932
In Europe, the Middle East, or in Mediterranean Africa:
Hach Europe, S.A./N.V.
Chaussée de Namur, 1
B-5150 Floriffoux (Namur), Belgium
Telephone: (32) (8l) 44.71.71
FAX: (32) (81) 44.13.00
114
APPENDIX A Process pH Electrode Without Internal Preamp
To accommodate other manufacturers meters, Hach offers the free-flowing reference
electrode system without an internal preamplifier. A shielded cable is connected directly to
the reference and pH sensing half cell and can be terminated with a connector which is
compatible with the existing meter. No temperature measuring device is included with the
system, and must be supplied by the meter manufacturer if temperature compensated pH
measurement is desired.
Included in the system are the pH electrode and sensor (in flat or round bulb
configuration), electrolyte pump, electrolyte, and the manual. Flow cells must be ordered
separately. Setup, maintenance and troubleshooting procedures found in the manual apply
to electrodes without preamps as well.
PROCESS pH ELECTRODE WITHOUT PREAMP STRUCTURE AND ACCESSORIES
Description
Cat No.
Process pH Electrode System without Preamp, Round Bulb Sensor................................................................... 48275-00
Process pH Electrode System without Preamp, Flat Sensor ................................................................................ 48275-01
Each System includes:
Electrolyte, 4/pkg
Installation Kit
Instruction Manual
Maintenance Kit
pH, Electrode, Flat or Round Bulb
Pump Module
OPTIONAL ACCESSORIES
Description
Cat. No.
Teflon Tubing Kit, 15.24 m (50 ft.)...................................................................................................................... 46399-00
REPLACEMENT PARTS
Description
Cat. No.
Barb Fitting, 1/16" ................................................................................................................................................. 31002-00
Check Valve.......................................................................................................................................................... 46863-00
Compression Fittings, 1/16" ..................................................................................................................................43631-00
Compression Nut (for mounting electrode) ......................................................................................................... 46861-00
CPVC "T" Fitting (1.5" NPT) .............................................................................................................................. 45338-00
Electrolyte Reservoir Bottle ................................................................................................................................. 46310-00
Ferrule, 1/16" ......................................................................................................................................................... 43634-00
Fitting, Male Luer Lock, 1/4" ................................................................................................................................43633-00
Mounting Collar ................................................................................................................................................... 46860-00
O-ring (for electrode mounting kit (flow-thru cell)) ............................................................................................40214-00
O-ring (for sensors) .............................................................................................................................................. 48208-00
Pulse Dampener/Bubble Trap Assembly ............................................................................................................. 30483-00
pH Electrode Without Preamp, Bulb.................................................................................................................... 48290-00
pH Electrode Without Preamp, Flat ..................................................................................................................... 48290-01
Replaceable pH Sensor, Bulb ............................................................................................................................... 48253-00
Replaceable pH Sensor, Flat ................................................................................................................................48254-00
Pump Module Installation Kit .............................................................................................................................. 46405-00
Pump Module Maintenance Kit ........................................................................................................................... 46406-00
Stopcock, Priming "T" ......................................................................................................................................... 43637-00
Strain Relief Grip, 1/16" (electrolyte tubing) ........................................................................................................ 43617-00
Syringe, 10 cc....................................................................................................................................................... 22024-00
Tubing, Polyurethane (per ft.) (pump module) .................................................................................................... 43623-00
Tubing, Teflon, 1/16" OD (per ft.) ......................................................................................................................... 44989-00
Tubing, Polyethylene, 1/16" (per ft.) (electrolyte reservoir).................................................................................. 45524-00
Wrench, for sensor replacement........................................................................................................................... 48264-00
115
116
APPENDIX B Supplemental Compliance Information
Instrument Engineering Bulletin
The Hach EC1000 shows an accuracy shift when exposed to radio frequency interference
of 3 and 10 volts per meter. What this means to you is that if the displayed data is not
stable (within the accuracy and repeatability specifications) and other interferences are
not suspected as the cause, inspect the area for portable phones, paging service tower/
antennas, or any other transmitting communication device. For example, if the user of the
instrument detects a measurement deviation while using a hand-held radio communication
device to relay information to a base station, the interference is clearly caused by the
hand-held radio communication device. To resolve the interference problem, move the
hand-held radio communication device at least 3 to 4 meters from the instrument to
provide isolation.
As shown in the following table, the instrument reading may deviate slightly at specific
frequencies. Any electronic instrument is sensitive to radio waves if the power is great
enough. However typical transmitting power is limited by regulatory controls and field
strengths greater than 3 to 10 volts per meter are seldom experienced.
Frequency Display w/o RF Display w/10V RF Temperature w/o RF Temperature w/10 V/m
(MHz)
(pH)
(pH)
(°C)
(°C)
30
9.3
8.29
23.3
26.9
36
9.12
8.12
21.3
18.00
38
9.12
8.12
21.3
18.00
50
9.12
7.47
21.3
18.30
57
9.12
6.51
21.3
17020
65
9.12
8.59
21.3
20.20
76
9.3
7.47
23.8
21.5
82
9.12
6.31
21.3
16.90
90
9.3
7.94
23.8
28.6
115
9.12
-1.66
21.3
3.50
120
9.12
4.70
21.3
1.40
124
9.3
7.58
23.9
29.6
125
9.12
8.52
21.3
20.00
142
9.12
2.63
21.3
10.00
176
9.12
8.83
21.3
20.60
181
9.3
7.23
24
22.2
200
9.12
8.29
21.3
19.40
220
9.12
8.69
21.3
20.20
229
9.3
4.17
24
13
260
9.12
8.42
21.3
20.10
265
9.3
7.49
24.1
19.7
271
9.3
7.1
24.1
20.00
300
9.12
8.33
21.3
19.10
304
9.3
4.48
24.2
15.7
322
9.31
7.33
24.2
20.2
326
9.12
8.81
21.3
20.40
328
9.31
6.9
24.2
21.8
348
9.12
8.98
21.3
—
361
9.28
8.99
21.8
—
117
APPENDIX B, continued
Frequency Display w/o RF Display w/10V RF Temperature w/o RF Temperature w/10 V/m
(MHz)
(pH)
(pH)
(°C)
(°C)
373
9.28
385
9.29
420
9.3
430
9.12
450
9.12
3.89
21.8
13.2
5.56
21.8
15.9
6.57
21.9
18.2
8.79
21.3
22.10
8.86
21.3
22.20
470
9.3
8.47
22
26.10
490
9.12
8.45
21.3
29.20
510
9.12
8.75
21.3
30.70
550
9.12
9.12
21.3
27.00
647
9.12
8.95
21.3
23.30
118
INDEX
A
E
Acid error ..............................................................21
Adding Electrolyte ................................................71
air bubbles .............................................................72
alarm cable ............................................................64
alarm connections .................................................63
Alarm features .......................................................17
ALARMS ........................................................47, 48
Alarms .............................................................28, 66
ALARMS submenu ..............................................25
Assembling the Electrolyte Line ...........................71
AUTO TC .............................................................34
Editing a Setup Value ...........................................25
electrode ................................................................63
Electrode Wiring ...................................................67
Electrolyte pump ...................................................17
F
Flow-Thru Cell .....................................................61
flow-thru cell .........................................................22
Flow-Thru Cell Installation ..................................62
Fuse Replacement .................................................88
G
B
Gain .......................................................................49
GENERAL SETUP ...............................................47
baud rate ................................................................45
baud rates ..............................................................34
H
C
Hach One ORP Electrode .....................................21
Hach One pH Electrode ........................................21
Hach One pH Process Electrode ...........................85
Hysteresis ..............................................................28
hysteresis ...............................................................28
Calibration ............................................................37
Calibration Procedure Variations ..........................40
Calibration Review ...............................................41
Changing Pump Tubing ........................................87
Connection to the pH Electrode ............................71
Connection to the Pump Module ..........................71
control loop ...........................................................49
CONTROLLER ....................................................47
controller .........................................................17, 63
controller connections ...........................................66
Controller Front Panel ..........................................18
Controller GAIN ...................................................31
Controller Installation/ Panel Mount ....................58
Controller PRESET ...............................................31
Controller RATE ...................................................31
Controller RESET .................................................31
Crystal Formation .................................................84
Current Loop Configuration .................................77
Current Loop Customer Connection Box .............78
Curve .....................................................................52
Customer Service ..................................................57
I
Initial Setup ...........................................................33
in-line application .................................................22
In-Line Electrode Installation ...............................62
Installation ............................................................75
Installing the pH/ORP Electrode ..........................60
Invalid Calibration Indication ...............................39
J
Jumper Settings for Current Loop ........................77
Jumper Settings for RS-232C ...............................77
K
keyboard lockout ...................................................35
Keylock .................................................................35
L
D
Light’s Solution ....................................................42
Line Voltage Selection ....................................66, 69
Data communication format selections .................45
DATABIT .............................................................35
DEAD BanD .........................................................31
Dead Band .............................................................49
Default Settings .....................................................27
Dip Switch Descriptions .......................................77
119
Pump Module and Electrical Connections ............69
Pump Motor Replacement ....................................90
Pump Wiring .........................................................68
Purging the System .........................................72, 84
M
MAN TC ...............................................................34
Manual entry of buffer value ................................40
Marginal Calibration Indication ............................38
maximum tubing length ........................................59
Meter Fuse Replacement .......................................88
MODE ...................................................................30
Mounting the Controller .......................................57
Mounting the Pump ..............................................59
mV Offset .............................................................43
R
Rate (Derivative) ...................................................52
Recommended Current Loop Hookup ..................79
RECORDER .........................................................47
recorder .................................................................63
Recorder 2 .............................................................33
Recorder and Controller ........................................66
Recorder Output ....................................................29
Reference Solution Timer .....................................36
Remote Input Commands .....................................46
Removing Existing Electrode ...............................81
Replacing Electrolyte ............................................82
Reset (Integral) .....................................................52
RS-232 Remote Commands ..................................47
RS-232C Cable Configuration ..............................78
RS-232C Interface Configuration .........................77
RS-232C Line Signal Definitions .........................78
N
negative sodium error ...........................................21
O
One Point Calibration with a Buffer .....................41
One-Point Grab Sample Calibration .....................40
Operating the User Programmable Setup .............25
ORP Calibration/mV Zero ....................................42
ORP Electrode Check ...........................................43
ORP Electrode Cleaning .......................................87
ORP Electrode Storage and Cleaning ...................84
OUTput TRIM ......................................................30
S
sampling techniques ..............................................22
Sensor Replacement ..............................................81
SERIAL I/O submenu ...........................................33
serial interface board .............................................45
SET PoiNT ............................................................31
Set Point ................................................................49
SET PoiNT entry ..................................................25
SETUP menu ........................................................25
Setup Menu ...........................................................28
setup menu ............................................................25
Setup Menu Default Value ...................................27
SIGnal AVeraGe entry ..........................................33
SIO connections ....................................................63
Sodium Error .........................................................21
Sodium Ion Error Graph .......................................21
solution temperature compensation (SOL TC) submenu ..........................................................33
Stability Indicator .................................................38
stop bits .................................................................45
STOPBIT ..............................................................35
Storage and Conditioning .....................................84
submersible application ........................................22
Submersible Sensor Installation ............................62
System Components .............................................23
P
Panel Mounting .....................................................57
PARITY ................................................................34
parity .....................................................................45
pH Calibration .......................................................38
pH Control Loop ...................................................24
pH Controller Basics .............................................49
pH Electrode Cleaning ..........................................86
pH Electrode Storage and Conditioning ...............84
PID control algorithm ...........................................49
PID Output ............................................................30
Pole Mounting .......................................................59
Potential of Zobell’s Solution ...............................43
Power ....................................................................65
power connections ................................................63
Power Cord Color Code ........................................65
Pre-amp Zero ........................................................42
Preparation of Redox Standard Solutions .............42
Preset .....................................................................49
Priming Tee Operation ..........................................73
print format ...........................................................45
PRINTER ..............................................................48
Pump Fuse Replacement .......................................90
Pump Installation ..................................................60
Pump Maintenance ...............................................87
120
T
Temperature Calibration .......................................41
temperature compensation (C COMP) submenu ..33
Temperature Compensation Setup ........................33
TITRation CURve .................................................31
Two-Point Calibration with Auto Recognition of
Hach Buffers .............................................39
W
Wall Mounting ......................................................59
Warning Codes .....................................................37
Warnings ...............................................................36
WINDOW menu ...................................................30
Wire Preparation ...................................................64
Wiring Meter .........................................................63
word length ...........................................................45
Z
Zobell’s Solution ...................................................42
121
122
123
48275-44
EC 1000 pH / ORP QUICK REFERENCE GUIDE
SETUP KEY MENU
OPTION
MENU ITEM
DESCRIPTION
ALARM OPTIONS
ALARM 1 (AL)
ALARM 2 (AL)
MODE (AL1)
Alarm 1 mode (pH high/low, mV high/low, temperature high/low)
SET PNT (AL1)
Alarm 1 setpoint for pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV) and temperature (-5.00 to +105 °C)
HYST (AL1)
Alarm 1 Hysteresis for pH (+0.01 to +2.00 PH), mV (+1.0 to +100.0 MV) and temperature (+0.1 to +2.0 °C)
DLY TIME (AL1)
Alarm 1 delay time (0 to 30 SECS)
MODE (AL2)
Alarm 2 mode (pH high/low, mV high/low, temperature high/low)
SET PNT (AL2)
Alarm 2 setpoint for pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV) and temperature (-5.00 to +105 °C)
HYST (AL2)
Alarm 2 Hysteresis for pH (+0.01 to +2.00 PH), mV (+1.0 to +100.0 MV) and temperature (+0.1 to +2.0 °C)
DLY TIME (AL2)
Alarm 2 delay time (0 to 30 SECS)
RECORDER OPTIONS
Mode (rEC)
WINDOW (rEC)
OUT TRIM (rEC)
Recorder output mode (pH, mV, temperature)
MINIMUM (rEC)
Recorder lower limit in terms of pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV) and temperature (-5.00 to +100 °C)
MAXIMUM (rEC)
Recorder upper limit in terms of pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV) and temperature (-5.00 to +100 °C)
ZERO TRIM (rEC)
Trim recorder zero (in terms of mA output)
FS TRIM (rEC)
Trim recorder full scale (in terms of mA output)
CONTROL OPTIONS (see INIT SET OUTPUT 2)
MODE (Con)
Controller mode (pH/mV)
SET PNT (Con)
Controller setpoint for pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV)
DEAD BND (Con)
Controller dead band for pH (+0.00 to +2.00 PH), mV (000.0 to +100.0 MV)
PRESET (Con)
Preset output for controller (0.0 to 100%)
GAIN (Con)
Controller gain (0.00 to 99.99)
RESET (Con)
Controller reset action (0.00 to 99.99/HR)
RATE (Con)
Controller rate action (00.00 to 99.99 MIN)
TITR CUR (Con)
OUT TRIM (Con)
MODE (Cur)
Titration curve type (LINEAR+, LINEAR-, CURVE)
POINTS (Cur)
Data point entry for titration curve
ZERO TRIM (Con)
Trim controller zero (in terms of mA output)
FS TRIM (Con)
Trim controller full scale (in terms of mA output)
© 1997, Hach Company All Rights Reserved
10-25-94 1ED
SETUP KEY MENU (Continued)
OPTION
MENU ITEM
DESCRIPTION
RECORD 2
MODE (rEC)
WINDOW (rEC)
OUT TRIM (rEC)
Recorder output mode (pH, mV)
MINIMUM (rEC)
Lower limit of recorder in terms of pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV)
MAXIMUM (rEC)
Upper limit of recorder in terms of pH (-2.00 to +16.00 PH), mV (-2000.0 to +2000.0 MV)
O TRIM (rEC)
Trim recorder zero (in terms of mA output)
FS TRIM (rEC)
Trim recorder full scale (in terms of mA output)
INIT SET
C COMP (Inl)
SERIAL (Inl)
MODE ( °C)
Type of temperature compensation (automatic, manual)
SET PNT ( °C)
Temperature setpoint for manual temperature compensation (-5.0 to +105 °C)
SOL TC
Solution temperature compensation (- 0.1 pH to + 0.1 pH)
BAUD (SEr)
Baud rate of serial I/O (300, 600, 1200, 2400, 4800, 9600)
PARITY (SEr)
Parity of serial I/O (odd, even, none)
DATA BIT (SEr)
Number of data bits of serial I/O (7/8)
STOP BIT (SEr)
Number of stop bits of serial I/O (7/8)
PRT DLY (SEr)
Enabled or Disabled
PRT INTR (SEr)
Print interval (00 to 99 MIN) (0 turns print interval off)
PRT LST (SEr)
Print a listing
OUTPUT 2
Output #2 Setup (Control, Record 2)
SIG AVG (Inl)
pH signal average value (00 to 10 SECS)
KEY LOCK
M UNLOCK (LoC)
Momentarily unlock the keyboard (30 minute time-out)
UNLOCK (LoC)
Unlock the keyboard
LOCK (LoC)
Lock the keyboard
REF SOLN
TMR RST (rEF)
Reset the reference solution timer
WARNINGS
DISP WRN
Display system warnings
CLR WARN
Clear system warnings
EC 1000 pH / ORP QUICK REFERENCE GUIDE
CALIBRATION MENU—CAL KEY
OPTION
STD 1 (CAL)
STD 2 (CAL) *
MENU ITEM
DESCRIPTION
AUTO STD (Sd 1)
pH calibration point 1 with auto recognition of buffer value
MAN STD (Sd 1)
pH calibration point 1 with manual entry of buffer value
AUTO STD (Sd 2)
pH calibration point 2 with auto recognition of buffer value
MAN STD (Sd 2)
pH calibration point 2 with manual entry of buffer value
GRAB SMP (CAL)
REVIEW (CAL)
TEMP (CAL)
pH calibration using a grab sample
OFFSET (CAL)
Display pH electrode offset calibration
SLOPE (CAL)
Display pH electrode slope calibration
STD 1 (CAL)
Display pH and mV value—use for CAL point 1
STD 2 (CAL)
Display pH and mV value—use for CAL point 2
TEMP 1 (CAL)
Temperature calibration point 1
TEMP 2 (CAL)
Temperature calibration point 2 (appears only after TEMP 1 is completed)
MV ZERO (CAL)
* Appears only after STD 1 is completed.
User input mV offset
DIAGNOSTICS TEST MENU (press ENTER and CLEAR simultaneously)
OPTION
MENU ITEM
DESCRIPTION
DISP TST
NONE
Perform a display pattern test
RLY TEST
NONE
Perform a relay open/close test
SIO TEST
NONE
Perform a SIO loop-back test
ZERO
Drive recorder output to full scale
FS
Drive recorder output to zero
1/2 FS
Drive recorder output to 1/2 scale
REC TEST
ZERO
Drive controller output to zero
FS
Drive controller output to full scale
1/2 FS
Drive controller output to 1/2 scale
NONE
D/A - A/D loop test (jumper must be installed)
PH DFT
Sets the pH probe calibration to default values
MV DFT
Sets the mV offset to the default of zero
TEMP DFT
Sets the temperature probe calibration to default values
COLD SRT
NONE
Perform a cold start
KEYLOCK
NONE
Set keyboard lockout code
4 MA MV
Calibrate 4 mA input current loop on mV input
20 MA MV
Calibrate 20 mA input current loop on mV input
4 MA TEM
Calibrate 4 mA input current loop on temperature input
20 MA TEM
Calibrate 20 mA input current loop on temperature input
CTRL TST
D/A TEST
CAL DFT
INP CAL
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