HANNA HI 504 pH/ORP Process Controller Instruction Manual

HI 504
Panel-mounted,
Microprocessor-based
pH/ORP Process Controller
Instruction Manual
TABLE OF CONTENTS
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MODEL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . 5
PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . 6
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 6
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . 8
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MECHANICAL DIMENSIONS . . . . . . . . . . . . . . . . . 11
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CALIBRATION MODE . . . . . . . . . . . . . . . . . . . . . . 14
SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CONTROL MODE . . . . . . . . . . . . . . . . . . . . . . . . . 42
IN-LINE CLEANING . . . . . . . . . . . . . . . . . . . . . . . 51
IDLE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
HOLD MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
ANALOG OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . 56
PC COMMUNICATION . . . . . . . . . . . . . . . . . . . . . 58
SHORT MESSAGING SERVICE (SMS) . . . . . . . . . . . . 71
MODEM CONNECTION . . . . . . . . . . . . . . . . . . . . 79
pH/ORP PROBE CHECK . . . . . . . . . . . . . . . . . . . . 81
SOLUTION COMPENSATION . . . . . . . . . . . . . . . . . 82
TEMPERATURE COMPENSATION . . . . . . . . . . . . . . 83
LAST CALIBRATION DATA . . . . . . . . . . . . . . . . . . . . 85
OFFSET AND SLOPE DIRECT SELECTION . . . . . . . . 87
EVENT LOG FILE SCROLLING . . . . . . . . . . . . . . . . 89
FAULT CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . 91
SELFTEST PROCEDURES . . . . . . . . . . . . . . . . . . . . . 92
ALARM - ERROR CONFIGURATION . . . . . . . . . . . . 100
pH VALUES AT VARIOUS TEMPERATURES . . . . . . . . 103
ELECTRODE CONDITIONING AND MAINTENANCE . 104
DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . 108
CE DECLARATION OF CONFORMITY . . . . . . . . . . 113
3
WARRANTY
All Hanna Instruments meters are guaranteed for two
years (sensors, electrodes and probes for six months)
against defects in workmanship and materials when used for
their intended purpose and maintained according to instructions. This warranty is limited to repair or replacement free of
charge.
Damage due to accident, misuse, tampering or lack of prescribed maintenance are not covered.
If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model
number, date of purchase, serial number and the nature of
the failure. If the repair is not covered by the warranty, you
will be notified of the charges incurred. If the instrument is to
be returned to Hanna Instruments, first obtain a Returned
Goods Authorization number from the Customer Service department and then send it with shipping costs prepaid. When
shipping any instrument, make sure it is properly packaged
for complete protection.
Hanna Instruments reserves the right to modify the design,
construction and appearance of its products without advance notice.
Dear Customer,
Thank you for choosing a Hanna Product.
Please read this instruction manual carefully before using the
instrument. It will provide you with the necessary information
for correct use of the instrument, as well as a precise idea of
its versatility.
If you need additional technical information, do not hesitate
to e-mail us at [email protected] .
This instrument is in compliance with
directives.
MODEL IDENTIFICATION
The models HI 504XYZ-α are pH/ORP controllers.
The meaning of the last letters is according to the following
scheme:
© 2003 Hanna Instruments
All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner, Hanna Instruments Inc.
5
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred
during shipping. If there is any noticeable damage, notify
your Dealer or the nearest Hanna Customer Service Center
immediately.
Note
Save all packing materials until you are sure that the instrument functions correctly. Any damaged or defective items must
be returned in their original packing materials together with
the supplied accessories.
GENERAL DESCRIPTION
The product is a real time microprocessor-based pH/ORP
controller. It provides accurate measurements, flexible
control capabilities and dual alarm signals.
The system is composed of a case inside which the signal
conversion circuitry, the microprocessor circuitry and the output
power drivers are contained.
MAIN FEATURES
• Configurations: for measure and control of pH or ORP, with
two separate sets of control settings. Thus no loss of settings
occurs when changing from pH to ORP and vice versa.
• Display: large LCD with 4 ½ 17 mm digits and 3 ½ 10 mm
digits.
• LEDs: a green LED (alarm relay) and a red LED for signaling
the device status.
• Alarm relay: one output relay for alarm condition (fail safe
mode: COM and NC are connected).
• Daily programmable control timing.
• Diagnostic features.
• pH/ORP probe check.
• Temperature sensor (Pt100 or Pt1000 type) with automatic
recognition and damage test.
• Hold management, including hold digital input to enter
hold mode with an external trigger.
• Logging of the last 100 error, configuration, calibration and
cleaning events.
6
• Calibration and Setup procedures are password protected.
• Calibration: pH calibration at 2 points with two possible sets
of buffers (either 7.01 - 4.01 - 10.01 or 6.86 - 4.01 - 9.18),
or at 1 point with user-selectable value.
• Temperature compensation of the HANNA standard buffers.
• GLP features: old probe check, dead probe check, calibration time-out, last calibration data internally recorded (nonvolatile EEPROM memory): calibration date and time, pH
offset, pH slope, number of calibration points and correspondent pH values.
• Solution compensation of the pH reading.
• Manual temperature setting when the temperature probe is
not inserted or temperature is out of range.
• Input: pH/ORP electrode with BNC connector.
• Input: pH/ORP/Temperature Digital Transmitter (HI
504910) which can be connected up to 1.2 Km (0.5 miles)
far away.
• Output (0-20 or 4-20 mA): one analog output for recording of pH/ORP or controlling (only for models with PID).
• RS485 communication with Short Messaging Service (SMS)
for GSM phones.
• Data logging: 6000 samples pH/°C or ORP downloadable
through RS485 and HI92500 application software.
• Real time clock.
OPTIONAL FEATURES (depending on model)
• LEDs: four yellow LEDs are provided for signaling the energizing of relay 1, relay 2 (optional), relay 3 (optional) and
relay 4 (optional).
• Relays: 1, 2 or 4 output relays. The relays LEDs are switched
ON whenever the correspondent relay is energized (NO
and COM connected).
• Advanced Cleaning is provided through two cleaning commands
and variety of trigger events (relays 3 and 4 only).
• Output (0-20 or 4-20 mA): second independent analog
output for recording of temperature or controlling (only for
models with PID).
• PID control.
7
FUNCTIONAL DESCRIPTION
FRONT PANEL
1. Liquid Crystal Display
2. LCD key
enters and exits the event scrolling mode. During pH
calibration, alternately displays pH buffer value or current
temperature
3. SETUP key
enters and exits setup mode
4. CAL DATA key
last calibration data viewing (enters and exits)
5. CAL key
initiates and exits calibration mode
6. key
increases the blinking digit/letter by one when selecting a
parameter. Advances forward while in last calibration data
viewing mode or event scrolling mode. Increases the temperature setting when temperature probe is not inserted
7. key
decreases the blinking digit/letter by one when selecting a
parameter. Reverts backward while in last calibration data
viewing mode or event scrolling mode. Decreases the
temperature setting when temperature probe is not inserted
8. key
moves to the next digit/letter (circular buffer) when selecting a parameter. Same as key during last calibration
data viewing mode. Move to the next piece of information
for the current event while in event scrolling mode
9. CFM key
confirms current choice (and skips to the next item) ENTER
10. LEDs
Relay’s 1, 2, 3, 4 activation
11. LEDs
Controller Status, alarm activation
8
REAR PANEL
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
BNC Socket for pH or ORP electrode
Connection for Potential Matching Pin
Connection for electrode reference
Connections for Pt 100/Pt 1000 temperature sensor
Not Connected, for future use
Digital Transmitter input
HOLD input
Advanced Cleaning input (optional)
Power supply input
Alarm terminal
Relay 2 - second dosing terminal (optional)
Second analog output (optional)
Relay 1 - first dosing terminal
First analog output
HOLD output
Relay 4 - for Advanced Cleaning feature (optional)
Relay 3 - for Advanced Cleaning feature (optional)
RS485 output terminal
Unplug the meter before starting any electrical connections.
Disconnect the Potential Matching Pin when setup item I.04=”OFF”
9
SPECIFICATIONS
Range
-2.00 to 16.00 pH
-2000 to 2000 mV
-30 to 130.0 ºC
Resolution
0.01 pH
1 mV
0.1 ºC above -10 ºC; 1 ºC below
Accuracy
±0.02 pH
±2 mV
±0.5 ºC (-9.9 to 130.0 ºC); ±1 ºC (-30 to -10 ºC)
(@20°C/68°F)
Typical EMC Deviation
±0.2 pH
±10 mV
±0.5 ºC
Analog Input
4 to 20 mA
Digital Input for
RS485
the pH/ORP/°C Transmitter
Other Digital Insulated Inputs • 2 digital insulated inputs: 1 for hold and 1 for
the advanced cleaning
• ON state: 5 to 24 VDC
Digital Insulated Output
A digital insulated contact closed upon hold mode
Temperature compensation Automatic or manual from -30 to 130 ºC
Temperature probe
With 3-wire or 2-wire Pt100/Pt1000 sensor
(with automatic recognition and damage test)
Installation Category
II
Power Supply
(depending on model)
230±10% VAC, 115±10% VAC or 100±10% VAC;
50/60 Hz
Power Consumption
10 VA
Over Current Protection
400 mA 250V Quick Blow Fuse
Max. Oscillation Frequency 8 MHz
Relays 1, 2, 3, 4
10
Electromechanical relay SPDT contact outputs,
5A-250 VAC, 5A - 30 VDC (resistive load)
Fuse protected: 5A, 250V Quick Blow Fuse
Alarm Relay
Electromechanical Relay SPDT contact output,
5A - 250 VAC, 5A - 30 VDC (resistive load)
Fuse protected: 5A, 250V Quick Blow Fuse
Analog Output
• 2 independent outputs
• 0 - 22 mA (configuring as 0-20 mA or 4-20 mA)
Analog Output Resolution
0.1‰ f.s.
Analog Output Accuracy
± 2‰ f.s.
Data logging
6000 pH/°C or ORP samples
Environment
0 to 50 ºC; max 85% RH non-condensing
Casing
IP20 (housing); IP54 (front panel)
Enclosure
single case ½ DIN
Weight
approximately 1.6 kg (3.5 lb.)
MECHANICAL DIMENSIONS
FRONT VIEW
SIDE VIEW
11
INSTALLATION
Refer to diagram on page #9
• Input power: Connect a 3-wire power cable
to the terminal strip line (L), earth (PE) and
neutral (N) terminal connections.
Power: 100VAC-120mA / 115VAC-100mA / 230VAC-50mA.
Line Contact: 400mA fuse inside.
PE must be connected to ground; leakage current 1mA.
12
Note
Note
Note
Note
• Electrode: Connect the pH or ORP electrode to the BNC
socket (#1 at page 9).
To benefit from the differential (symmetrical) input, connect
the proper electrode wire (if available) or a cable with a
potential matching pin (grounding bar) to the relevant terminal (#2 at page 9) and enable the differential input
through the setup code I.04.
When it is not possible to immerse the Potential Matching Pin
together with the pH electrode in the solution (asymmetrical
input), disable the differential input through the setup code I.04.
In this case, detach the Potential Matching Pin from its connector. Failure to do so may cause damage of the reference
electrode.
• Pt 100/Pt 1000 Terminals: these contacts (#4 at page 9)
connect the Pt 100/Pt 1000 temperature sensor for automatic temperature compensation of pH measurement. In
the case of shielded wire, connect the shield to pin 4.
In the case of a 2-wire sensor connect the Pt 100/Pt 1000 to pins 1
and 3, and short pins 2 and 3 with
a jumper wire.
If the Pt 100/Pt 1000 has more than
2 wires, connect the two wires of
one end to pins 2 and 3 (pin 2 is
an auxiliary input to compensate
for the cable resistance) and one
wire from the other end to pin 1.
Leave the fourth wire unconnected, if present.
The instrument automatically recognizes the sensor type (Pt
100 or Pt 1000).
• Analog Outputs: when using shielded cable, if the shield
is not connected at the other end of the cable, then connect it to the “+” terminal, otherwise leave it floating.
All cables connected to rear panel should end with cable lugs.
A circuit breaker (rated 10A max.) must be connected in
close proximity to the equipment, and in a position easy to
reach by the operator, for disconnection of the instrument
and of all the devices connected to the relays.
13
CALIBRATION MODE
The calibration mode allows to calibrate the pH/ORP input,
temperature input and 4-20 mA analog outputs.
The controller is factory calibrated for all these parameters.
Periodical calibration of the instrument is recommended, in
particular when greatest accuracy is required and at least biyearly.
It is possible to calibrate the electrode over only one point,
but it is always good practice to perform a 2-point calibration.
To enter the calibration mode press the CAL key.
Enter the correct password and press the CFM key. If a wrong
password is entered, the instrument returns to the previous
mode.
Note
If the meter is set as an ORP controller (setup item G.00), the
pH calibration, pH reading offset adjustment, and pH offset
and slope are not available. If the meter is selected as a pH
controller, no ORP calibration can be selected.
Note
Any calibration procedure can be aborted at any time by
pressing the CAL key, and the instrument returns to the previous mode.
The pH/ORP controller can be calibrated through a onepoint or two-point calibration.
The pH calibration can not be performed if the pH electrode
is broken or leaking or the reference electrode is broken or
dirty and an error is active. The ORP calibration can not be
performed if the “Reference electrode broken or dirty” error is
active. For pH calibration the temperature probe should be
connected to the process meter.
All calibrations refer to the process controller. No calibration
for the Digital Transmitter can be performed by the process
controller, but the Digital Transmitter Calibrator must be used
for that.
14
The pH and ORP calibrations can not be initiated while the
process controller is configurated to take measurements from
the Digital Transmitter.
pH CALIBRATION
It is recommended to perform pH calibration when the probe
is replaced and after any cleaning action.
To perform any pH calibration procedure, the instrument has
to be set as pH controller.
Initial Preparation
Pour small quantities of pH 7.01 (HI 7007) and pH 4.01
(HI 7004) or pH 10.01 (HI 7010) solutions into individual
beakers. If possible, use plastic beakers to minimize any EMC
interference.
For accurate calibration use different beakers for each buffer
solution, the first one for rinsing the electrode and the second
one for calibration. By doing this, contamination between
buffers is minimized.
RINSE
CALIBRATION
HI 7007
HI 7007
• Enter the calibration mode, select the pH calibration (by
moving through the menu with the and keys), then
press the CFM key.
• Choose the pH buffer set between the two available ones:
the standard set (4.01, 7.01, 10.01) and the NIST set (4.01,
6.86, 9.18). For the standard set confirm the “Std”; for the
NIST set confirm the “niSt” (use the and keys for select
between the two options).
15
The default buffer set is the one used for last calibration,
even if the procedure was not completed.
• Once confirmed the set of buffer values, the primary LCD shows the
measured pH value, while the secondary LCD displays the first required buffer
value.
Two-point calibration
• Remove the protective cap from the pH
electrode and immerse it into the buffer
solution (e.g. pH 7.01) together with
the Potential Matching Pin and the temperature probe, then stir gently.
Note
The electrode should be submerged approximately 4 cm (11/2’’) in the solution.
The temperature probe has to be located
as close as possible to the pH electrode.
Note
When it is not possible to immerse the Potential Matching Pin
together with the pH electrode in the solution, disable the
differential input by setting setup item I.04 to “OFF”.
• When the reading becomes stable, the
probe indicator will stop flashing (after
about 30 seconds), and if the pH value
is close to the selected buffer, the
“CFM” indicator will start blinking, otherwise the “WRONG” indicator, the pot
and the BUF tags will start blinking.
• In the first case press the CFM key to confirm calibration.
The meter will show the scrolling message “Press CFM again
to confirm the current buffer or right to escape” (to prevent
from confirming the calibration point inadvertently).
Pressing again CFM, the secondary LCD will display the
second expected buffer value.
16
• In the second case (pH value not close to the buffer) the
meter will remain in the same state until the reading becomes unstable or the calibration mode is quitted.
• For the second buffer value it is possible to choose between pH 4.01 and pH 10.01 (or pH 4.01 and pH 9.18 if
the NIST set has been selected). Use the or key to
switch between the two possibilities.
• Once selected the buffer, the procedure is the same as for
the first calibration point.
Note
A time-out of 1.5 minutes is present for the pH electrode
response time. During calibration, if the pH reading is not
stable after 1.5 minutes, the device displays twice the scrolling message “time-out”, then shows “WRONG” and it is not
possible to complete calibration.
• At the end of calibration, with the meter set as pH controller, the instrument checks if the offset is between -30 and
30 mV and the slope between 53.5 and 62 mV/pH. If the
values are not within these ranges, the message “OLd
ProbE” scrolls twice across the LCD. The electrode is still
working, but it is necessary to perform a cleaning procedure (see “Electrode conditioning and maintenance” and
“In-line Cleaning” sections) or replace it.
If the offset is outside the -60 to 60 mV range, the “dEAd
ProbE” message will scroll across the LCD and the corresponding error is activated. The electrode has to be replaced
as soon as possible because there is no reliability on the
measured pH values.
One-point calibration
A one-point calibration at a value different from the standard
buffer values is possible by entering the desired calibration
value. This is the actual pH value at the current calibration
temperature.
• Enter the pH calibration mode (no matter if the standard or
NIST buffer set is selected), then press the
SETUP key while the secondary LCD is displaying the first buffer value (pH 7.01 or pH
6.86).
17
• The pH calibration value will switch
to 7.00, the first digit starts blinking
and it is possible to change its value
simply using the or key.
• Once selected the first digit value, press the key: the first
digit will be fixed and the second one will start blinking.
Pressing of the key repeatedly will result on circularly
moving on the secondary LCD.
• When the desired calibration value is reached (must be
within 0.00 to 16.00 pH), press the CFM key to confirm
and the calibration will proceed as described above.
• If the selected value is outside boundaries, the confirmation is not accepted and the first digit keeps blinking (waiting
for confirmation of a valid value).
Note
If SETUP key is pressed instead of CFM, the calibration value
selection is aborted and the meter reverts back to a two-point
calibration.
ORP CALIBRATION
To perform ORP calibration it is necessary to connect an HI
931001 or HI 8427 simulator to the BNC socket.
The meter has to be set as ORP controller.
• Set item I.04 to “OFF” to disable the Matching Pin.
• A two-point calibration has to be performed: the first point
value is 0 mV and the second one can be chosen between
350 mV and 1900 mV.
• Enter the calibration mode, select the ORP calibration (use
the and keys to move through setup menu) and press
the CFM key.
• Set the HI 931001 or HI 8427 simulator to 0 mV.
• The primary LCD will display the current mV measure and the secondary
LCD will show the first calibration
point (0 mV).
18
• When the reading becomes stable, if the ORP value is
close to the calibration point, the “CFM” indicator starts
blinking; otherwise the “WRONG” indicator blinks and
the “CAL” is fixed on.
• In the first case press CFM to confirm calibration. The
meter will proceed showing the scrolling message “Press
CFM again to confirm the current buffer or right to escape” (to prevent from confirming the calibration point
inadvertently). Pressing again CFM the secondary LCD will
display the second calibration point.
• In the second case (blinking “WRONG”) the meter will
remain in the WRONG state until the reading becomes
unstable or the calibration mode is exited by pressing the
CAL key.
• For the second calibration point it is possible to choose
between 350 mV or 1900 mV. Pressing the or key the
value on the secondary LCD will switch between the two
possibilities.
• Once selected the second calibration point, set the HI
931001 (350 mV) or HI 8427 (350 or 1900 mV) simulator to the same value and the calibration proceeds as for
the first point.
Note
In ORP calibration there is no time-out.
ANALOG OUTPUT CALIBRATION
The instrument can be provided with one or two analog outputs, each of them can be calibrated.
• Connect an Ammeter or the HI 931002 calibrator to the
analog output to measure the current erogated by the meter.
• Enter the calibration mode and move through the menu
using the or key until “Out 1” or “Out 2” message
appears on the primary LCD.
19
• Once visualized the selected output, press the key to
choose the range of the analog output (0-20 mA or 4-20
mA); then press the CFM key to confirm the choice.
• Once selected and confirmed the
range for the analog output, the
secondary LCD shows the first point
of calibration (1 or 4 mA) and the
primary LCD displays the range of
the actual calibration.
• With the tester check the real current value provided by the
instrument at the output port. If this value is different from
the expected one, it is possible to change the current
erogated by the instrument pressing the or key.
• Adjust the value until it matches with the first point of calibration, then press CFM to confirm. The instrument will
turn to the second calibration point (20 mA).
• The calibration procedure is the same as for the first point.
• Once the instrument is calibrated for both points (and confirmed), it will exit from the calibration menu.
TEMPERATURE CALIBRATION
• Prepare a beaker containing
crushed ice and water at 0°C (32°F)
and another one with hot water at
25°C (77°F) or 50°C (122°F).
• Use a Checktemp or another calibrated thermometer with a
resolution of 0.1° as a reference
thermometer.
• Immerse the temperature probe in
the beaker with ice and water as
near to the Checktemp as possible.
20
°C
°C
0 °C
(32 °F)
50 ºC
(122 ºF)
°C
0 °C
(32 °F)
Note
The instrument can support Pt100 or Pt1000 temperature
sensor and calibration can be performed with anyone of these
two probes.
• After entering the calibration mode, move through the menu
(using the or key) to choose the temperature and the
correct kind of used probe; the primary LCD shows “°C” and the
secondary LCD gives indication
about the kind of probe (“100” indicates a Pt100 probe, while
“1000” stands for a Pt1000
probe).
Press the CFM key to confirm selection.
• The calibration has to be performed
over two points: the first point has to
be 0°C and the second one can be
chosen between 25°C and 50°C.
Once confirmed the type of calibration, the primary LCD
will display the current temperature measure and the secondary LCD will show the first calibration point (0°C).
• When the reading becomes stable, if the temperature value
is close to the calibration point the CFM tag starts blinking, otherwise the WRONG indicator will flash.
• In the first case press the CFM key to confirm calibration.
The meter will proceed showing the scrolling message “Press
CFM again to confirm the current buffer or right to escape” (to prevent from confirming the calibration point
inadvertently).
• Pressing again the CFM key, the secondary LCD will display the second
calibration point.
• In the case the measured temperature is not close to the
calibration value, the meter remains in the WRONG status
until the reading becomes unstable or the calibration mode
21
is exited (by pressing the CAL key).
• When performing the second calibration point, it is possible to choose between two values, 25°C and 50°C. Pressing
the or key the value on the secondary LCD will switch
between the two possibilities.
• Once selected the value, immerse the temperature probe
in the second beaker as near as possible to the Checktemp
and the calibration procedure will be the same as for the
first point.
VOLT CALIBRATION
The instrument is factory calibrated; however the user may
also perform the Volt calibration, which is a procedure available for the meter configured as pH controller only.
During pH measurements the instrument reads a mV value
from the electrode and then converts it into a pH value.
• Set item I.04 to “OFF” to disable the Matching Pin.
• Connect a HI 931001 or HI 8427 simulator to the BNC
socket.
• Once entered the calibration mode,
move through the menu with or
key, select the Volt calibration (the
primary LCD shows “UOLt” message) and confirm it by pressing the
CFM key.
• After confirmation the primary LCD
will show the actual mV value and
the secondary LCD will display the
first calibration point.
• The calibration is performed over two points, 0 and 350 mV.
• Set the HI 931001 or HI 8427 simulator to 0 mV.
• When the reading becomes stable, if the measured value
is close to the calibration point the CFM tag starts blinking, otherwise the WRONG indicator will flash.
• In the first case press the CFM key to confirm calibration.
22
The meter will proceed showing the scrolling message “Press
CFM to confirm the current buffer or right to escape” (to
prevent from confirming the calibration point inadvertently).
• Pressing again CFM the secondary LCD will display the
second calibration point.
• Set the HI 931001 or HI 8427 simulator to 350 mV and
follow the same procedure as for the first point.
• If the measured value is not close to the calibration value,
the meter will remain in the WRONG status until the reading becomes unstable or the calibration mode is exited (by
pressing the CAL key).
23
SETUP MODE
The Setup Mode allows the user to set all needed characteristics of the meter.
To enter the mode, press the SETUP key and
enter the password when the device is in idle or
control mode.
If the correct password is not entered, the user can only view
the setup parameters (except for passwords) without modifying them (and the device remains in control mode). An
exception is certain setup items, or flags, which can activate
special tasks, when set and confirmed.
To each setup parameter (or setup item) is assigned a three
characters (one letter followed by two digits) setup code which
is entered and displayed on the secondary LCD. The first
character identifies the group of setup items, while the two
digits identify the particular item within that group.
The setup codes can be selected after password is entered
and CFM key is pressed. When CFM is pressed, the current
setup item is saved on EEPROM and the following item is
displayed.
The possible transitions in setup mode are the following:
ENTERING THE PASSWORD
• Press SETUP to enter the setup mode. The primary LCD will
display “0000”, while the secondary LCD shows “PAS”.
The first digit of the primary LCD will blink.
• Enter the first digit of the password by using the or key.
• Then move to the next digit with and
enter a digit as described above. Continue
for the last two digits.
24
• When the whole password has been inserted, press CFM to confirm it.
Note
The default password is set at “0000”.
ENTERING SETUP ITEMS
After confirmation of the password the
primary LCD will show the name of the
first setup group (see table) while the
secondary LCD will display the setup
code of the first item of the group.
• By pressing the or key it is possible to cycle through
the setup groups; the secondary LCD will always show the
code of the first item of the group.
• Once a group is selected, it is possible to choose an item manually.
Pressing the key, the first digit of
the setup code will start blinking.
Now it is possible to change its value
by pressing the or key.
• Pressing the key again, the first
digit will be fixed while the second
digit starts blinking and its value can
be changed as described above.
• By pressing the key again all the
digits will be fixed.
• If CFM key is pressed, the selected item is confirmed; the
secondary LCD will show the setup item code while the
primary LCD will display the current item value.
If a fixed set of values is available for the selected item, use
the or key to switch between them.
25
Otherwise, if a numeric value has to be entered for the
item, use the or key to change the value of the blinking digit and the key to cycle through the number’s
digits.
• Once a value is set, press the CFM key to confirm. The
instrument will turn to the next item and the new item’s
value will be displayed on the primary LCD.
• If a wrong value is confirmed, the
WRONG indicator starts blinking,
the new value is not accepted and
the instrument will not switch to the
next item until a correct value will
be confirmed.
• Instead of selecting the item manually, it is possible to cycle
through all the items of a selected group by pressing repeatedly CFM key. The procedure to modify the item’s value
is the same described above.
If the last item of the group is reached, by pressing the
CFM key again the primary display will show the group
name and it will be possible to change the group by pressing the or key.
Note
26
At any time for exiting the setup mode press the SETUP key. If
no modification has been confirmed, no setup item is
changed.
Note
While in the setup mode, if no activity is performed for about
5 minutes after entering the setup mode, the mode is automatically exited and the instrument returns to the previous
mode.
The below table lists the setup codes along with the description of
the specific setup items, their valid values and whether the item is
present for ORP mode.
Titles in Italic character (eg. “SETPOINT 1 “) represent different
subgroups within the same group. The subgroup name (eg.
“Set1”) is showed when entering the first item of the subgroup. To scroll through subgroups, use the key.
Depending on the device model, some of the below items or
item values may not be available.
Code
Valid Values
Default
Present
for ORP
G.00 pH/ORP input
“PH”, “OrP” (see note 10)
“PH”
yes
G.01 Temperature compensation
“AtC”: Automatic
“AtC”
“USEr”: Manual (see notes 9, 25)
no
G.02 Manual or probe error
temperature
-30 to 130.0 ºC
(see notes 9, 25)
25.0
no
G.10 Factory ID
0000 to 9999 (see note 20)
0000
yes
00
yes
GENERAL (“GEnE”)
G.11 Process ID alias RS485 address 00 to 99 (see note 20)
G.12 Hardware Identifier
(see notes 4, 20)
7 digits identification number, read only
yes
G.98 Calibration/hold password
0000 to 9999 (see notes 2, 20) 0000
yes
G.99 General password
0000 to 9999 (see notes 2, 20) 0000
yes
“OFF”: Control mode disabled
“On”: Control mode enabled
yes
CONTROL (“CtrL”)
C.00 Control enable
“OFF”
SETPOINT 1 (“SEt1”)
C.10 Setpoint 1 mode (M1)
(see note 1)
“OFF”: Disabled
“OOHI”
yes
“OOHI”: ON-OFF, high set point
“OOLO”: ON-OFF, low set point
“PIdH”: P.I.D., high set point / “PIdL”: P.I.D., low set point
C.11 Setpoint 1 (S1)
(see note 1)
-2.00 to 16.00 pH or
-2000 to 2000 mV
8.00 pH or
500 mV
yes
27
Code
Valid Values
Default
Present
for ORP
C.12 Hysteresis for setpoint 1 (H1) 0.00 to 18.00 pH or
(see note 1)
0 to 4000 mV
1 pH or
50 mV
yes
C.13 Deviation for setpoint 1 (D1) 0.50 to 18.00 pH or
(see note 1)
25 to 4000 mV
1 pH or
50 mV
yes
C.14 Reset time for setpoint 1
0.1 to 999.9 minutes
999.9 mins
yes
C.15 Rate time for setpoint 1
0.0 to 999.9 minutes
0.0 mins
yes
C.20 Setpoint 2 mode (M2)
(see note 1)
“OFF”: Disabled
“OOLO”
“OOHI”: ON-OFF, high set point
“OOLO”: ON-OFF, low set point
“PIdH”: P.I.D., high set point
“PIdL”: P.I.D., low set point
yes
C.21 Setpoint 2 (S2)
(see note 1)
-2.00 to 16.00 pH or
-2000 to 2000 mV
6.00 pH or
-500 mV
yes
C.22 Hysteresis for setpoint 2 (H2) 0.00 to 18.00 pH or
(see note 1)
0 to 4000 mV
1 pH or
50 mV
yes
C.23 Deviation for setpoint 2 (D2) 0.50 to 18.00 pH or
(see note 1)
25 to 4000 mV
1 pH or
50 mV
yes
C.24 Reset time for setpoint 2
0.1 to 999.9 minutes
999.9 mins
yes
C.25 Rate time for setpoint 2
0.0 to 999.9 minutes
0.0 mins
yes
C.30 Alarm relay delta value
for setpoint 1 (A1)
(see notes 1, 22)
0.50 to 18.00 pH
or
25 to 4000 mV
1.00 pH
or
100 mV
yes
C.31 Alarm relay delta value
for setpoint 2 (A2)
(see notes 1, 22)
0.50 to 18.00 pH
or
25 to 4000 mV
1.00 pH
or
100 mV
yes
C.32 Maximum relay ON time
1-60 minutes
(after that an alarm is generated)
60
yes
C.33 Alarm mask time
00:30
yes
SETPOINT 2 (“SEt2”)
ALARM (“ALAr”)
00:00 to 30:00 minutes
PROGRAMMABLE CONTROL TIMING (“tIME”)
28
C.41 Hold time start
00:00 to 23:59 (see note 8)
00:00
yes
C.42 Hold time stop
00:00 to 23:59 (see note 8)
00:00
yes
Code
Valid Values
Default
Present
for ORP
C.51 Monday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.52 Tuesday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.53 Wednesday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.54 Thursday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.55 Friday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.56 Saturday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.57 Sunday hold mode
enable
“OFF”: Disabled
“On”: Enabled
“OFF”
yes
C.60 Proportional control mode
period
01:00 - 30:00 minutes
05:00
yes
C.70 Hold mode end delay
00 to 99 seconds
00
yes
OUTPUT (“OutP”)
RELAYS (“rELA”)
O.01 Relay 1 mode
(see notes 19, 21)
“OFF”: Disabled
“SEt1”
“SEt1”: Control, setpoint 1
“SEt2”: Control, setpoint 2
“SCLE”: Simple cleaning
“HOLd”: Energized in hold mode
yes
O.02 Relay 2 mode
(see notes 19, 21)
“OFF”: Disabled
“SEt2”
“SEt1”: Control, setpoint 1
“SEt2”: Control, setpoint 2
“SCLE”: Simple cleaning
“HOLd”: Energized in hold mode
yes
O.03 Relay 3 mode
(see notes 15, 19)
“OFF”: Disabled
“OFF”
yes
“SCLE”: Simple cleaning
“ACLE”: Advanced cleaning / “HOLd”: Energized in hold mode
O.04 Relay 4 mode
(see notes 15, 19)
“OFF”: Disabled
“OFF”
yes
“SCLE”: Simple cleaning
“ACLE”: Advanced cleaning / “HOLd”: Energized in hold mode
29
Code
Valid Values
Default
0.05 Hold digital output
“OFF”: Disabled
“HOLd”
“HOLd”: Enabled upon hold mode
Present
for ORP
yes
ANALOG OUTPUT #1 (“Out1”)
O.10 Analog output 1 mode
(see notes 6, 21)
“rECO”: Recorder
“SEt”: Control, setpoint 1
“rECO”
yes
O.11 Analog output 1 type
“0-20”: 0-20 mA
“4-20”: 4-20 mA
4-20 (6)
yes
O.12 Measurement value for
-2.00 to 16.00 pH
0.00 pH or
analog output 1 minimum or -2000 to 2000 mV
-2000 mV (6)
(O_VARMIN1)
(O_VARMIN1 R O_VARMAX1-1 pH or 50 mV,
O_VARMIN1 R O_HOLD1R O_VARMAX1)
yes
O.13 Measurement value for
-2.00 to 16.00 pH
14.00 pH or
analog output 1 maximum or -2000 to 2000 mV
2000 mV (6)
(O_VARMAX1)
(O_VARMIN1 R O_VARMAX1-1 pH or 50 mV,
O_VARMIN1 R O_HOLD1R O_VARMAX1)
yes
O.14 Analog output 1 value upon “USEr”: User selected value
“HOLd”
hold mode (see note 16)
“HOLd”: Previous value is frozen
yes
O.15 Analog output 1 value upon -2.00 to 16.00 pH
7.00 pH or
hold mode if O.14=”USEr” or -2000 to 2000 mV
0 mV (6)
(O_HOLD1)
(it must be within the O_VARMIN1
to O_VARMAX1-1 interval)
yes
ANALOG OUTPUT #2 (“Out2”)
30
O.20 Analog output 2 mode
(see notes 21, 26)
“rECO”: Recorder (temperature) “rECO” (pH)
“SEt”: Control, setpoint 2 (pH) or “OFF” (ORP)
or
“OFF”: Disabled
“SEt”: Control, setpoint 2 (ORP)
yes
O.21 Analog output 2 type
“0-20”: 0-20 mA
“4-20”: 4-20 mA
yes
“4-20”
O.22 Measurement value for
-30 to 130.0 ºC
0 ºC
analog output 2 minimum (O_VARMIN2 R O_VARMAX2-10 ºC,
(O_VARMIN2)
O_VARMIN2 R O_HOLD2R O_VARMAX2)
no
O.23 Measurement value for
-30 to 130.0 ºC
+100.0 ºC
analog output 2 maximum (O_VARMIN2 R O_VARMAX2-10 ºC,
(O_VARMAX2)
O_VARMIN2 R O_HOLD2R O_VARMAX2)
no
Code
Valid Values
Default
Present
for ORP
O.24 Analog output 2 value upon “USEr”: User selected value
“HOLd”
hold mode (see note 16)
“HOLd”: Previous value is frozen
no
O.25 Analog output 2 value upon -30 to 130.0 ºC
25ºC
hold mode if O.24=”USEr” (it must be within the O_VARMIN2
(O_HOLD2)
to O_VARMAX2-1 interval)
no
BAUD RATE (“bAud”)
O.30 Baud rate (see note 20)
1200, 2400, 4800, 9600, 19200 19200
O.31 Modem calls answer enable “OFF”: Disabled
(see note 20)
“On”: Enabled
yes
“OFF”
yes
I.00 Measurement input selection “Prob”: BNC
(see note 12)
“trAn”: Digital Transmitter
“Prob”
yes
I.03 Digital Transmitter address
(used only if I.00=”trAn”)
00 to 99
00
yes
I.04 Potential matching pin
(see notes 24, 25)
“OFF”: unused (asymmetrical input) “On”
“On”: in use (symmetrical input)
yes
I.10 Calibration time-out
00 to 99 days (00 means disabled) 90
no
I.11 Life check time
(see notes 11, 25)
“OFF”: life check disabled
1: 1 hour
2: 2 hours
4: 4 hours
“OFF”
yes
I.12 Minimum pH probe slope
(see note 25)
45 to 75 mV/pH
45 mV/pH
no
I.13 pH electrode impedance
test enable (see note 25)
“OFF”: disabled
“On”: enabled
“On”
no
I.14 Reference electrode impedance “OFF”: disabled
test enable (see note 25)
“On”: enabled
“On”
yes
I.15 Max ref. electrode impedance 0.5 to 100.0 kΩ
(see note 25)
50.0 kΩ
yes
INPUT (“InPU”)
REAL TIME CLOCK (“rtC”)
r.00 Current day
01 to 31 (see note 20)
from RTC (5)
yes
r.01 Current month
01 to 12 (see note 20)
from RTC (5)
yes
r.02 Current year
2000 to 2099 (see note 20)
from RTC (5)
yes
31
Code
Valid Values
Default
r.03 Current time
00:00 to 23:59 (see note 20)
from RTC (5)
Present
for ORP
yes
CELLULAR/PC CONNECTION (“PHOn”)
P.00 RS485 Connection type
(see note 20)
“PC”: PC Connection
“PC”
“CELL”: Cellular module connection
yes
P.01 PIN Number (see note 20)
0000 to 9999
yes
0000
P.02 Telephone number #1
(see notes 20, 27)
00000000000000000000 - - - - - - - - - - - - - - - - - - - to 99999999999999999999
yes
(“- - - - - - - - - - - - - - - - - - - -” indicates no number)
P.03 Telephone number #2
(see notes 20, 27)
00000000000000000000 - - - - - - - - - - - - - - - - - - - to 99999999999999999999
yes
(“- - - - - - - - - - - - - - - - - - - -” indicates no number)
P.04 Number of remaining
000 to 200
messages (see notes 20, 28) and 222
100
yes
P.05 Number of repeated
SMSs (see notes 20, 29)
2
yes
P.06 Delay between two
05 to 60 minutes
subsequent SMSs (see notes 20, 30)
10
yes
P.07 SIM expiration day
(see notes 20, 31)
01 to 31
01
yes
P.08 SIM expiration month
(see notes 20, 31)
01 to 12
01
yes
P.09 SIM expiration year
(see notes 20, 31)
2000 to 2099
2010
yes
F.00 pH or ORP actual value
(see notes 17, 25)
measured value -1.00 pH or
-200 mV to measured value
+1.00 pH or +200 mV
measured
value
yes
F.01 pH or ORP reading offset
adjustment (see note 25)
-1.00 to +1.00 pH or
-200 to +200 mV
0.00 pH
or 0 mV
yes
F.10 Temperature actual value measured value -10.0 ºC to
(for ATC only, see notes 18, 25) measured value +10.0 ºC
meas. value
(see note 17)
no
F.11 Temperature reading offset -10.0 to +10.0 ºC
adjustment (for ATC only, see notes 18, 25)
0.0 ºC
no
0 to 5
READING OFFSETS (“OFFS”)
32
Code
Valid Values
Default
Present
for ORP
SOLUTION COMPENSATION (“SOLC”)
S.00 Solution compensation enable “On”: compensation enabled
“OFF”: compensation disabled
“OFF”
no
S.10 pH value for point #1
-2.00 to 16.00 pH
7.00 pH
no
S.11 Temperature value for
point #1 (SCT1)
-30 to 130.0 ºC
|SCT1-SCT2| S 1.0 ºC
20 ºC
no
S.20 pH value for point #2
-2.00 to 16.00 pH
7.00 pH
no
S.21 Temperature value for
point #2 (SCT2)
-30 to 130.0 ºC
|SCT1-SCT2| S1.0 ºC
30 ºC
no
IN-LINE CLEANING (“CLEA”)
SIMPLE CLEANING (“SCLE”)
L.00 Rinsing time
5 to 99 s
20 s
yes
L.01 Pause time
10 to 9999 minutes
1440 minutes
yes
ADVANCED CLEANING (“ACLE”)
L.10 Pre-rinsing time
0 to 99 s
20 s
yes
L.11 Detergent washing
0 to 99 s
10 s
yes
L.12 Rinsing time
5 to 99 s
20 s
yes
L.13 Pause time
Min. pause time (L.14) to
9999 minutes
1440 minutes
yes
L.14 Minimum pause time
10 to Pause time (L.13)
10 minutes
yes
L.15 Cleaning trigger
“ ti”: Timer only
“ ti”
yes
“ E”: Digital input or RS485 (external) only
“ti E”: Timer and digital input or RS485 (external)
“tiEM”: Timer masked by digital input (external)
L.16 Repeated cleaning number
0 to 10
0
yes
L.17 Number of cleaning
without detergent
0 to 10
0
yes
ERROR CONFIGURATION (“Erro”)
E.00 Alarm for setpoint 1
error configuration
0 to 5
and 24 to 29 (see note 7)
3
yes
E.01 Alarm for setpoint 2
error configuration
0 to 5
and 24 to 29 (see note 7)
5
yes
33
Code
Valid Values
Default
Present
for ORP
E.02 Max relay ON time
error configuration
0 to 5
and 24 to 29 (see note 7)
3
yes
E.03 Life check error configuration 0 to 11
(see note 11)
and 24 to 35 (see note 7)
9
yes
E.10 pH electrode broken
or leakage
0 to 11
and 24 to 35 (see note 7)
9
no
E.11 Reference electrode broken
or dirty or not immersed
0 to 47 (see note 7)
21
yes
E.12 Old pH probe
error configuration
0 to 11
and 24 to 35 (see note 7)
0
no
E.13 Dead pH probe
error configuration
0 to 11
and 24 to 35 (see note 7)
2
no
E.14 Calibration time-out
error configuration
0 to 11
and 24 to 35 (see note 7)
0
no
E.20 Temperature broken probe
error configuration
0 to 11
and 24 to 35 (see note 7)
3
no
E.40 Digital Transmitter
error configuration
0 to 11
and 24 to 35 (see note 7)
9
yes
E.50 Cellular error configuration
0 to 11 (see note 7)
3
yes
E.90 Power reset
error configuration
0 to 11
and 24 to 35 (see note 7)
2
yes
E.91 EEPROM corruption
error configuration
6 to 11
and 30 to 35 (see note 7)
9
yes
E.92 Watchdog error configuration 0 to 11
and 24 to 35 (see note 7)
2
yes
E.99 Level or pulse alarm relay
signal (see note 13)
“LE”: Level
“PULS”: Pulse
“LE”
yes
t.00 Display test
“OFF”: To skip without testing
“GO”: To start the display test
“OFF”
yes
t.01 Keyboard test
“OFF”: To skip without testing “OFF”
“GO”: To start the keyboard test
yes
t.02 EEPROM test
“OFF”: To skip without testing “OFF”
“GO”: To start the EEPROM test
yes
TEST (“tESt”)
34
Code
Valid Values
Default
Present
for ORP
t.03 Relays and LEDs test
“OFF”: To skip without testing
“GO”: To start the test
“OFF”
yes
t.04 Analog output 1 test
“OFF”: To skip without testing
“GO”: To start the test
“OFF”
yes
t.05 Analog output 2 test
“OFF”: To skip without testing
“GO”: To start the test
“OFF”
yes
t.06 Hold digital input test
“OFF”: To skip without testing
“GO”: To start the test
“OFF”
yes
t.07 Advanced cleaning
“OFF”: To skip without testing “OFF”
yes
digital input test
“GO”: To start the test
Warning: cleaning actions could be triggered by the input going high during the
test (see note 23).
t.08 Watchdog test
“OFF”: To skip without testing “OFF”
“GO”: To start the watchdog test
yes
Notes (1): M1 can not be set to “OOHI” or “OOLO” if O.10 is set to
“SEt” and vice versa;
if M1 = “OOHI” then 16.00 pH or 2000 mV S S1+A1;
if M1 = “OOLO” then -2.00 pH or -2000 mV R S1-A1;
if M1 = “PIdH” then D1 R A1 and 16.00 pH or 2000 mVSS1+A1;
if M1 = “PIdL” then D1 R A1 and -2.00 pH or -2000 mV R S1-A1;
M2 can not be set to “OOHI” or “OOLO” if O.20 is set to “SEt”
and vice versa;
if M2 = “OOHI” then 16.00 pH or 2000 mV S S2+A2;
if M2 = “OOLO” then -2.00 pH or -2000 mV R S2-A2;
if M2 = “PIdH” then D2 R A2 and 16.00 pH or 2000 mVSS2+A2;
if M2 = “PIdL” then D2 R A2 and -2.00 pH or -2000 mV R S2-A2;
if M1 = “OOHI” and M2 = “OOLO” then S1-H1S S2+H2;
if M1 = “OOLO” and M2 = “OOHI” then S2-H2S S1+H1;
if M1 = “PIdH” and M2 = “OOLO” then S1S S2+H2;
if M1 = “OOLO” and M2 = “PIdH” then S1+H1R S2;
35
if M1 = “PIdL” and M2 = “OOHI” then S1R S2-H2;
if M1 = “OOHI” and M2 = “PIdL” then S1-H1S S2;
if M1 = “PIdH” and M2 = “PIdL” then S1S S2;
if M1 = “PIdL” and M2 = “PIdH” then S2S S1;
were the minimum deviation (DN) is 0.5 pH (pH) or 25 mV (mV).
(2): The calibration/hold password allows only calibrations
and hold mode through keyboard for service personnel, while
the general password allows everything (including calibration). Obviously, the general password and the calibration/
hold password cannot be viewed among other items when
the “SETUP” key is pressed without entering the right general
password. The pH controller is sold with the general password set to “0000”.
(3): When a wrong setup value is confirmed, the pH controller does not skip to the next setup item, but remains in the
current item displaying a blinking “WRONG” indicator till
the parameter value is changed by the user (the same thing
happens also for the setup code selection). In some situations user cannot succeed in getting a parameter set to the
desired value if related parameters are not changed accordingly first (e.g. to set a pH high set point to 10.00 the high
alarm must be set to a value greater than 10.00 first).
(4): The hardware identifier is a read only value.
(5): When the controller is powered, RTC is checked to see if
an RTC reset occurred since last software initialization (if one
ever took place). If this is the case the RTC is initialized with
the default date and time 01-01-2000 - 00:00. An EEPROM
reset does not affect the RTC settings.
(6): Output is pH or mV depending on the controlled magnitude setting (pH or ORP).
36
(7): The value for error configuration is coded like this:
37
(8): The hold mode is never enabled by the control timing if
the “hold time start” is the same as the “hold time end”.
Items “C.41” and “C.42” apply to all days. The hold mode
can be enabled all day by using items “C.51” through “C.57”.
(9): See the “Temperature compensation” subsection for more
details on how the Automatic temperature compensation and
Manual temperature compensation work.
(10): Whenever the pH/ORP selection item is changed from
pH into ORP or vice versa all of the calibration and setup
data regarding pH (when changing to ORP) or ORP (when
changing to pH) are kept. They are automatically restored if
the controlled parameter is changed back later. The following setup items cannot vary when changing from pH to ORP
or vice versa (because they are items strictly related to the
instrument and not to the controlled magnitude): Factory ID,
Process ID alias RS485 address, Calibration/hold password,
General password, Baud rate, Modem calls answer enable,
Cellular/PC connection items, Hardware identifier and RTC
date and time. For proper operation while working with the
Digital Transmitter, this item must be equal to the correspondent one in the Digital Transmitter. If the two values do not
coincide a “Digital Transmitter error” is generated.
(11): A life check error is generated if the pH reading does not
vary for more than ±0.10 pH within the time selected through
the “life check time” item (pH controller) or mV reading for
more than ±10 mV within the same time (ORP controller).
(12): When the Digital transmitter (HI 504910) is used, the
temperature is measured by the transmitter along with pH
(pH controller), or ORP (ORP controller). These measurements are sent to the Process Controller. The calibration data
set for the Digital Transmitter is kept within the transmitter and
thus it is separated from the BNC set. This means that the
calibration slope and offset and the other GLP data are automatically switched from the BNC set to the Digital Transmitter set and vice versa when the measurement input is switched
from “Prob” to “trAn” respectively. For example, if the user
was using a pH electrode connected to the BNC, and at a
later time he starts using the transmitter, and after that the
measurement input selection is reverted back to “Prob”, it is
not necessary to calibrate the pH electrode again.
38
(13): The alarm relay can be energized continuously (by selecting “LE” for “level”) or with a pulse (by selecting “PULS”
for “pulse”). The pulse length is fixed to about 5 seconds.
(14): When the instrument is configured as ORP controller
some of the above items or the item values are not anymore
available to the user.
(15): Relay 3 an relay 4 must be both set to “ACLE” in order
to have the advanced cleaning enabled. If only one of them
is set to “ACLE” then it will behave as it were set to “OFF”.
When the advanced cleaning is enabled, relay 3 is used for
water pouring while relay 4 is used for detergent pouring.
(16): “HOLd” and “USEr” are effective only when “O.10”
and “O.20” are set to “rECO”. In the other cases the analog
output is set automatically to the minimum value upon hold
mode (i.e. “O.14”, “O.15” and “O.24”, “O.25” have no
effect if “O.10” = “SEt” and “O.20” = “SEt” respectively).
(17): “measured value” is the reading value with a null reading offset adjustment.
(18): if the device is set for MTC (item G.01 to “USEr”) then
items F.10 and F.11 cannot be modified nor seen. When item
G.01 is changed from “AtC” into “USEr”, item F.11 is automatically zeroed.
(19): When the relays set to “SCLE” are all set to something
else, the simple cleaning action, if in progress, is aborted
immediately. When relay 3 or relay 4 or both of them are set
to something else than “ACLE”, and the advanced cleaning
is in progress, cleaning is aborted immediately (but a complete rinsing phase is done before the actual end of the cleaning session).
(20): These items do not vary when the pH/ORP input selection (“G.00”) is changed.
(21): If the relay 1 mode or the relay 2 mode is set to “SEt1”,
the analog output 1 mode can not be set to “SEt” and vice
versa. Similarly, if the relay 1 mode or the relay 2 mode is set
to “SEt2”, the analog output 2 mode can not be set to “SEt”
and vice versa.
(22): Alarm relay delta value for setpoint 1 determines the
value of the correspondent alarm threshold by being added
39
to or subtracted from the setpoint value for a high (ON/OFF
or PID) or low (ON/OFF or PID) setpoint respectively. The
same is true for Alarm relay delta value for setpoint 2. A
small fixed hysteresis (0.2 pH for pH and 30 mV for ORP)
must be passed to have the alarm turned off (for a high
alarm the alarm is turned off below high alarm - hysteresis,
while for a low alarm the alarm is turned off above low alarm
+ hysteresis).
(23): The actual start of a cleaning action depends on how
relay 3, relay 4 and the Advanced Cleaning parameters have
been configured.
(24): If the item is set to “On”, the “m” tag near the secondary display will be fixed on.
If the item is set to “OFF” the connector for the Potential
Matching Pin must be left floating. Failure to do so may
cause damage of the reference electrode.
(25): When the Digital Transmitter is in use, the correspondent setting in the digital transmitter is used and this item is
not visible.
(26): This item is not visible for models without PID or without the second setpoint.
(27): An SMS will be sent to this telephone number (if different from “- - - - - - - - - - - - - - - - - - - -”) when an error
(configured for the SMS sending) occurs.
(28): This item sets the maximum number of SMS that the
instrument can send. Before this number reaches 0, an advising message will be sent to the phone number P.02 (and
P.03). This feature has been introduced to avoid the discharging of the credit of the SIM card. Once all the available
messages have been sent, the user is supposed to extract the
SIM card from the instrument and check the remaining credit
and expiration date of the card.
The item shows always the remaining available number of
SMS that can be sent, so its value is decremented every SMS
submission.
If the user sets this item to “222”, then no check will be made
on the maximum number of SMS and the instrument could
send an unlimited number of messages. In this case the item
value will not be decremented and no check will be made on
40
the SIM expiration date.
(29): Every SMS sent by the instrument requires a reception
confirmation from the user (phone call to the instrument). If
this confirmation does not arrive (for example because the
message was lost or did not reach the Short Message Service
Center), it is possible to set the instrument in order to send
again the message. The maximum number of repeated messages is set through this item (see P.06 for the delay between
two subsequent messages). If this item is set to 0, then no
confirmation is waited by the instrument.
(30): This item sets the delay between the sending of two
subsequent messages. It has effect only if item P.05 value is 1
or greater.
(31): The SIM’s expiration date has to be inserted manually
through these items (P.07 - P.09). The user is supposed to
update these items every time a recharge of the card occurs.
Three advising messages are sent to the telephone number
configured in item P.02 (and P.03) when the card is going to
expire (two weeks before, one week before and the day before).
If the user sets the item P.04 to “222” then no check will be
made on the SIM expiration date.
41
CONTROL MODE
The control mode is the normal operational mode for this meter.
During control mode HI 504 fulfills the following main tasks:
• convert information from pH/ORP and temperature inputs
to digital values and show them on the display;
• control relays and generate the analog outputs as determined by the setup configuration;
• display alarm condition;
• perform cleaning actions according to the relays configuration;
• start and stop hold mode according to the programmed
control timing;
• RS485 management.
In addition, the meter can log working data through RS485
connection. These data include:
• pH, mV and oC measured values;
• last calibration data;
• setup configuration (also from a remote workstation);
• event data.
In a normal situation, during control mode, the green LED is
ON and the error LED (red) is OFF. The red LED is never
fixed ON and blinks only upon an error.
The green LED is associated to the alarm relay and is OFF if
the alarm is active.
To deactivate the control mode set CONTROL ENABLE to
“OFF” in setup menu (CONTROL (“CtrL”) group).
When measurements are in overflow, the upper or lower range
limit is shown on the LCD with blinking digits.
RELAY MODES
There are four relay options that can be configured through
the setup menu to perform different tasks.
Once enabled, relays 1 and 2 can be used in four modes:
1. setpoint 1 (Analog output #1 must be set to recorder, “rECO”);
2. setpoint 2 (Analog output #2 must be set to recorder, “rECO”);
3. simple cleaning;
4. hold mode.
42
In the first two cases the configuration of Setpoint (1 or 2)
determines the operating mode of the relay. Once enabled,
the control relay can be configured to control as a ON/OFF
or PID control of the acid/base dosage.
A High-hight Alarm is imposed for acid/base dosage time
when the relays are energized continuously. This parameter
can be set through setup procedure (CONTROL group, setup
item C.32). When the upper time boundary is reached, an
alarm is generated and device stays in alarm condition until
relay is de-energized.
If the “hold mode” is selected for the relay, then it is energized only when the meter is in hold mode. In this case there
is no time boundary for the ON state of the relay.
The option for relays 3 and 4 can be configured to operations in three modes:
1. simple cleaning;
2. advanced cleaning;
3. hold mode.
ON/OFF CONTROL MODE
Once a relay is enabled (set 1, set 2), the setpoint can be
configured to be activated as a high limit (“OOHI”) or as a
low limit (“OOLO”). In both cases the following values have
to be defined through setup:
• setpoint value (pH/mV; setup item C.11 or C.21);
• hysteresis for setpoint (pH/mV value; setup item C.12 or C.22).
A control device can be wired to the contact output.
Connect the device to the COM and NO
(Normally Open) or NC (Normally
Closed) terminals of the relay.
The ON relay state occurs when relay is energized (NO and
COM connected, NC and COM disconnected).
The OFF relay state occurs when relay is de-energized (NO
and COM disconnected, NC and COM connected).
The following graph shows relay state along with pH measured value (similar graph can be derived for mV control).
As shown below, when the measured pH exceeds the setpoint
threshold, the relay(s) is (are) energized, until the pH mea43
sure falls below setpoint value minus hysteresis.
Such a behavior is suitable to control an acid dosing pump.
ON
OFF
Setpoint –
Hysteresis
Setpoint
14
A relay enabled as a low setpoint, is energized when the pH
value is below the setpoint and is de-energized when the pH
value is above the sum of setpoint and the hysteresis. This
operational mode may be used to control an alkaline dosing
pump.
ON
OFF
Setpoint
Setpoint +
Hysteresis
14
P.I.D. CONTROL MODE
PID control is designed to eliminate the cycling associated
with ON/OFF control in a rapid and steady way by means of
the combination of the Proportional, Integral and Derivative
control methods.
With the proportional function, the duration of the activated
control is proportional to the error value (Duty Cycle Control
Mode); as the measurement approaches setpoint, the ON
(relay energized) period diminishes.
44
The following graph describes the pH process controller behavior. Similar graph may apply to the mV controller.
t0
t0+Tc
t0+2Tc
t0+3Tc
During proportional control the process controller calculates
the relay activation time at certain moments t0, t0+Tc, t0+2Tc
etc. The ON interval (the shaded areas) is then dependent to
the error amplitude.
With the integral function (reset), the controller will reach a
more stable output around the setpoint providing a more
accurate control than with the ON/OFF or proportional action only.
The derivative function (rate action) compensates for rapid
changes in the system reducing undershoot and overshoot of
the pH value.
During PID control, the ON interval is dependent not only to
the error amplitude but even to the previous measurements.
Definitely PID control provides more accurate and stable control than ON/OFF controllers and it is best suitable in system
with a fast response, quickly reacting to changes due to addition of acid or base solution.
An example of how the response overshoot can be improved with
a proper rate action setting is depicted in the following graphic.
pH
RATE ACTION COMPENSATES FOR RAPID CHANGES
t
45
PID TRANSFER FUNCTION
The transfer function of a PID control is as follows:
Kp + Ki/s + s Kd = Kp(1 + 1/(s Ti) +s Td)
with Ti = Kp/Ki, Td = Kd/Kp,
where the first term represents the proportional action, the
second is the integrative action and the third is the derivative
action.
Proportional action can be set by means of the Proportional
Band (PB). Proportional Band is expressed in percentage of the
input range and is related to Kp according to the following:
Kp = 100/PB.
100%
Controller
output
0
Error
Proportional Band
The proportional action is set directly as “Deviation” in pH
and mV units respectively. Relation between Deviation (D)
and PB is:
D = Range * PB/100
Each setpoint has a selectable proportional band: PB1 for
setpoint1 and PB2 for setpoint2. Two further parameters must
be provided for both setpoints:
Ti = Kp/Ki, reset time, measured in minutes
Td = Kd/Kp, rate time, measured in minutes.
Ti1 and Td1 will be the reset time and rate time for setpoint1,
while Ti2 and Td2 will be the reset time and the rate time for
setpoint2.
46
TUNING A PID CONTROLLER
The proportional, integrative, derivative terms must be tuned,
i.e. adjusted to a particular process. Since usually the process variables are not completely known, a “trial and error”
tuning procedure must be applied to get the best possible
control for the particular process. The target is to achieve a
fast response time and a small overshoot.
Many tuning procedures are available and can be applied
to HI 504. A simple and profitable procedure is reported in
this manual and can be used in almost all applications.
The user can vary five different parameters, i.e. the setpoint
(S1 or S2), the deviation (D1 or D2), the reset time, the rate
time and the proportional control mode period Tc .
Note
User can disable the derivative and/or integrative action (for
P or PI controllers) by setting Td = 0 and/or Ti = MAX (Ti)
respectively through the setup procedure.
SIMPLE TUNING PROCEDURE
The following procedure uses a graphical technique of analyzing a process response curve to a step input.
Note This procedure allows only a rough setting of the PID parameters and could not fit all the processes.
It is suggested that I and D parameters be set by technical
personnel, because their inadequate values may cause undesired behaviors of the system.
Note
Connecting an external device (chart recorder or PC) to the
controller, the procedure is easier and doesn’t need the use
of hand plotting the process variable (pH or mV).
1. Starting from a solution with a pH or mV value different
from the dosed liquid (at least a 3 pH or 150mV difference)
turn on the dosing device at its maximum capacity without
the controller in the loop (open loop process). Note the
starting time.
2. After some delay the pH or mV starts to vary. After more
delay, the pH or mV will reach a maximum rate of change
(slope). Note the time that this maximum slope occurs and
the pH or mV value at which it occurs. Note the maximum
slope in pH or mV per minute. Turn the system power off.
3. On the chart draw a tangent to the maximum slope point until
intersection with the horizontal line corresponding to the initial
47
pH or mV value. Read the system time delay Tx on the time axis.
4. The deviation, Ti and Td can be calculated from the following:
• Deviation = Tx * max. slope (pH or mV)
• Ti = Tx / 0.4 (minutes)
• Td = Tx * 0.4 (minutes).
5. Set the above parameters and restart the system with the
controller in the loop. If the response has too much overshoot or is oscillating, then the system can be fine-tuned
slightly increasing or decreasing the PID parameters one
at a time.
Example:
the chart recording in the figure
aside was obtained continuously
dosing an alkaline solution to a
weak acid solution in a tank. The
initial settings will be:
Max. slope = 3 pH/5 mins = 0.6
pH/min
Time delay = Tx = approx. 7 mins
Deviation = Tx * 0.6 = 4.2 pH
Ti = Tx / 0.4 = 17.5 mins
Td = Tx * 0.4 = 2.8 mins
ALARM RELAY
The alarm relay functions in the following manner:
FS•C = NO (Normally Open)
Energized Relay
COM
FS•O = NC (Normally Closed)
De-energized Relay
During normal operation (no alarm condition) the alarm relay is energized; during an alarm condition or power failure
the relay will be de-energized. As long as a separate battery
power system is used an alarm will sound.
Example:
High alarm set at 10 pH
Low alarm set at 4 pH
48
An hysteresis will eliminate the possibility of continuous sequences ‘energizing/de-energizing’ of the alarm relay when
the measured value is close to the alarm setpoint. The hysteresis amplitude is 0.2 pH for pH and 30 mV for ORP.
Moreover the alarm signal is generated only after an user
selectable time period (alarm mask) has elapsed since the
controlled value has overtaken one alarm threshold. This
additional feature will avoid fake or temporary alarm conditions.
Note
If the power supply is interrupted, the relay is de-energized as
if in alarm condition to alert the operator.
In addition to the user-selectable alarm relays, the meter is
equipped with the Fail Safe alarm feature.
The Fail Safe feature protects the process against critical
errors arising from power interruptions, surges and human
errors. This sophisticated yet easy-to-use system resolves these
predicaments on two fronts: hardware and software. To eliminate problems of blackout and line failure, the alarm function
operates in a “Normally Closed” state and hence alarm is
triggered if the wires are tripped, or when the power is down.
This is an important feature since with most meters the alarm
terminals close only when an abnormal situation arises, however, due to line interruption, no alarm is sounded, causing
extensive damage. On the other hand, software is employed
to set off the alarm in abnormal circumstances, for example, if
the dosing terminals are closed for too long a period. In both
cases, the red LED will also provide a visual warning signal.
The Fail Safe mode is accomplished by connecting the external alarm circuit between the FS•C (Normally Open) and
the COM terminals. This way, an alarm will warn the user
when pH goes over the alarm thresholds, the power breaks
down and in case of a broken wire between the process meter
49
and the external alarm circuit.
Note
In order to have the Fail Safe feature activated, an external
power supply has to be connected to the alarm device.
CONTROL THROUGH ANALOG OUTPUT
Instead of configuring relays, it is possible
to have an output signal (selectable
among 0-20 mA and 4-20 mA) proportional to the PID action at the analog output terminals.
With this output, the actual output level amplitude is varied
continuously (with an update delay of 5 seconds) between
the maximum and the minimum values rather than varying
the proportion of ON and OFF times (duty cycle control).
The output signal range can be selected through setup items
O.11 (output #1) and O.21 (output #2).
A device with analog input (e.g. a pump with a 0-20 mA
input) can be connected to these terminals.
The analog output #1 is associated to setpoint 1 and the
analog output #2 to setpoint 2.
To have a control through analog output, a setpoint has to
be configured to “PidL” or “PidH” and the corresponding
output has to be set to Control instead of Recorder: “SEt”
value in setup item O.10 (analog output #1) or O.20 (analog output #2).
In this case no relay can be associated with the same setpoint
to be used for the control, otherwise it is not possible to set
O.10 (or O.20) to “SEt”. On the other hand if a control
through analog output is already associated with a setpoint,
it is not possible to configure a relay to the same setpoint.
50
IN-LINE CLEANING
The cleaning feature allows an automatic cleaning action of
the electrodes. To perform cleaning, the controller activates
an external device (pump).
Cleaning can be of two types:
• Simple cleaning: with water only, it can be triggered only
by a timer (periodical cleaning) or by an error for which a
cleaning action can be configured (i.e. a “Reference electrode broken or dirty” error).
• Advanced cleaning (optional): with water and detergent,
it can be triggered by the following events:
• timer (setup item L.15 set to “ti”);
• digital input or RS485 command (external trigger; setup
item L.15 set to “E”);
• timer and digital input or RS485 command (external trigger; setup item L.15 set to “ti E”);
• timer masked by external digital input (an external digital
input disables the cleaning; setup item L.15 set to “tiEM”);
• error for which a cleaning action is configured (i.e. a
“Reference electrode broken or dirty” error).
The type of cleaning action is selected through the relays
configuration and the time between two consequent cleaning
(if timer configured) has to be set through setup item L.01 for
simple cleaning and L.13 for advanced cleaning.
Cleaning actions do never take place if no relay is configured for cleaning. The advanced cleaning requires both relays
3 and 4 configured for that kind of cleaning: relay 3 is associated with water and relay 4 corresponds to detergent.
A minimum pause time has to be set for advanced cleaning
(setup item L.14) to avoid continuous cleaning due to the
external trigger. A cleaning action with detergent can be followed by one or more actions without detergent, when desired.
Simple cleaning actions are performed in the following order:
• Rinsing time: the device enters hold mode; all relays configured for simple cleaning are energized. If the device is in
normal measurement mode, the “rinSinG” message scrolls
on the LCD; otherwise (i.e. the device is in setup mode) the
cleaning is performed, but no message appears.
51
• Hold mode end delay (set by item C.70): if the device
was controlling when the cleaning action started, then the
hold mode end delay must expire before restarting control.
Advanced cleaning actions are performed in the following order:
• Pre-rinsing time: the device enters hold mode and relay
3 is energized. If the device is in normal measurement mode,
the “PrE-rinSinG” message scrolls on the LCD.
• Detergent washing time: relay 4 is energized (and relay
3 continues to be energized). If the device is in normal
measurement mode, the “dEtErGEnt” message scrolls on
the LCD. It is possible to configure some cleaning without
detergent (setup item L.17). In this case the message displayed is “no dEtErGEnt”.
• Rinsing time: relay 4 is de-energized (and relay 3 continues to be energized). If the device is in normal measurement
mode, the “rinSinG” message scrolls on the LCD.
• Hold mode end delay: if the device was controlling when
the cleaning action started, then the hold mode end delay
must expire before restarting control.
The time each of these actions last for can be configured
through setup menu, items L.00 or L.10, L.11, L.12.
When performing a cleaning action (either “simple “ or “advanced”) with the device in normal measurement mode, the
secondary LCD displays a countdown for the seconds remaining to the cleaning action end.
If the “Repeated cleaning number” value (setup item L.16) is
different from 0, then the advanced cleaning is repeated a
number of times equal to this value after the first cycle (e.g.
one more cycle if L.16=1).
52
Note
If a cleaning session is being performed, it is possible to stop
it by pressing and holding the and keys together (
key first) or through RS485 by sending the appropriate command. When the advanced cleaning is aborted, in any case
a complete rinsing phase is performed before the actual termination of the cleaning action. If the abortion is issued during the rinsing phase, the phase continues normally till its
natural end.
Note Calibration of whatever input or output can not be initiated
while the Simple or Advanced Cleaning is in progress. Conversely, cleaning can not be triggered while whatever calibration is being performed.
53
IDLE MODE
During idle mode the device performs only measurements
but it does not activate relays in order to control the process
or let out a control signal to the analog output.
In a normal situation the alarm relay is energized (no alarm
condition) and the green LED is ON, the red LED is also fixed
ON to warn users the device is not controlling the process,
the yellow LEDs are OFF.
Moreover, the alarm relay could be de-energized upon an
error (whether that happens or not, depends on the customized alarm configuration; see “Alarm” section for more details).
Nevertheless, the error due to alarm threshold overtaking
does never generate an alarm during idle mode since all the
control functions have been disabled by the user.
The red LED flashes in any case upon an error.
Idle mode is useful to disable control actions when the external devices are not properly settled or whenever any fault
circumstance is detected.
To set the meter to idle mode it is sufficient to disable the
control mode (setup item C.00 to “OFF”).
When measurements are in overflow, the upper or lower range
limit is shown on the LCD with blinking digits.
54
HOLD MODE
This function is started by:
• calibration;
• setup;
• cleaning in place;
• the hold digital insulated input1 when it is on; normally,
the signal level is polled at least every 4 seconds;
• the proper key combination ( and keys together) for
service; the same key combination is used both to start
and to stop the hold mode (the key combination acts as
the hold digital input). To activate the hold mode in this
way, password is required;
• the daily programmable control timing (see setup items
C.41 through C.57);
• an error event (see also the “Alarm - Error Configuration”
section);
• the hold start/stop RS485 command;
• the service hold (Calibration and Setup) in the Digital Transmitter.
During hold mode, control and control relays are disabled.
If the meter is in idle or control mode
and displaying measurements, the last
measured value (both for temperature
and pH/ORP) is frozen on the display;
the secondary LCD shows “HLd”;
the temperature value can be displayed on the secondary
LCD by pressing and holding the key; when the key is
released the “HLd” message comes back on the secondary
LCD.
If the pH or mV or temperature values
are not available because the meter
did note take any measurement before going to hold mode, then the
primary or the secondary LCD shows
dashes.
1
There are two digital insulated inputs: one for hold mode and one for advanced cleaning.
55
All the alarm signals (red LED, alarm relay, fault currents) are
suspended while in hold mode (the correspondent error events
are not closed), unless the hold mode is being triggered by
one or more errors and no other trigger source (different from
an error) is active.
The analog output follows these rules:
• if it is configured for control (i.e. setup item O.10 or O.20
set to “SEt”), its value is set to the minimum (e.g. 4 mA for
4-20 mA output);
• if it is configured for a recorder, its value is either set to a
user-selected value through the setup item O.15 or O.25
(when item O.14 or O.24 is set to “USEr”) or frozen to the
last value, i.e. the output value just before entering the
hold mode (when item O.14 or O.24 is set to “HOLd”).
After the cause which made the instrument enter the hold
mode expires, the device exits hold mode but control and
alarms remain disabled for a delay which can be user-selected (0 to 99s) through setup item C.70. In that situation
measurements are normally acquired, displayed and recorded
through the analog output or the RS485.
Note Alarms (red LED, alarm relay, fault currents) are not disabled
if the hold mode is being triggered by an error and no other
trigger source is active.
56
ANALOG OUTPUT
The meter is provided with two insulated current outputs.
It is possible to configure the operating mode of each output
through setup menu (items O.10 and O.20).
If the meter is configured as an ORP controller, the output
#2 can be enabled to operate in control mode only (setup
item O.20 set to “SEt”; see the “Control through analog output” section for more details).
If the meter is set as a pH controller, each available output
can be used as recorder or in control mode.
To configure an output to control mode the corresponding
item (O.10 for output #1 and O.20 for output #2) has to be
set to “SEt” (see the “Control through analog output” section
for more details).
When set to recorder (setup item O.10 or O.20 set to
“rECO”), the output #1 gives a current signal proportional
to the actual pH value, while the output #2 gives a signal
proportional to the temperature value.
By default, the minimum and maximum values of analog
output correspond to the minimum and maximum of meter’s
range. For example, for a selected analog output of 4-20
mA associated to output #1, the default values are -2.00
and 16.00 pH corresponding to 4 and 20 mA respectively.
These values can be changed by the user to have the analog
output matching a different pH range; for example, 4mA =
3.00pH and 20mA = 5.00pH.
To change the default values, enter the setup mode and
change the items O.12 and O.13 for output #1, and O.22
and O.23 for output #2.
The analog output signal range (0-20 mA or 4-20 mA) of
each output is also selectable through the setup items O.11
and O.21.
57
PC COMMUNICATION
RS485 standard is a digital transmission method that allows
long lines connections. Its current-loop system makes this
standard suitable for data transmission in noisy environments.
Data transmission from the instrument to the PC is possible
with the HI 92500 Windows® compatible application software offered by Hanna Instruments and an RS232 to RS485
adapter with Send Data Control connected to the serial port
of your PC.
The user-friendly HI 92500 offers a variety of features such
as logging selected variables or plotting the recorded data. It
also has an on-line help feature to support you throughout
the operation.
The readings logged into the HI 504 internal memory can
be downloaded through HI 92500.
HI 92500 makes it possible for you to use the powerful means
of the most diffused spreadsheet programs. Simply run your
favorite spreadsheet program and open the file downloaded
by HI 92500. It is then possible to elaborate the data with
your software (e.g. graphics, statistical analysis).
To install HI 92500 you need a 3.5" drive and few minutes
to follow the instructions conveniently printed on the disk’s
label.
Contact your Hanna Dealer to request a copy.
SPECIFICATIONS
The RS485 standard is implemented in HI 504 with the following characteristics:
Data rate:
up to 19200 bps (manually selected)
Communication:
Bidirectional Half-Duplex
Line length:
up to 1.2 Km typ. with 24AWG cable
Loads:
up to 32 typ.
Internal termination: none
Windows® registered Trademark of “Microsoft Co.”
58
CONNECTIONS
The connections for the 6-pin RS485 terminal provided are
as follows:
There is an internal short between the two A pins and between the two B pins.
The instrument has no internal line termination. To terminate
the line, an external resistor equal to the characteristic line
impedance (typically 120Ω) must be added at both ends of
the line.
The RS485 can connect up to 31 HI 504 on the same physical network. All the units are slave devices and are monitored
and controlled by a single master station (typically an industrial PLC or PC).
Each HI 504 unit is identified by its Process ID number,
included in the 00 to 99 interval, which corresponds to the
Process ID configured through the setup item G.11.
(If the instrument does not recognize the address within the
command string, then it discards all the following bytes).
As additional feature, the controller is also provided with two
pins (5V and GND) in order to apply the Fail Safe Open Line
protection method. To avoid erroneous readings in Open59
Line conditions, pull-up and pull-down resistors should be connected as shown.
The Fail-Safe resistors are connected only to
one unit in the line, and their value depends
on the application and characteristic impedance of the connection cable.
The GND pin of the interface connector and all the interface
signals are optoisolated from the ground of the instrument,
the electrode and the temperature sensor.
Before connecting the meter to the computer, consult the computer manual.
The process controller can only work as a slave component.
In other words it can work as a remote terminal equipment
answering to the commands only.
RS485 PROTOCOL FOR HI 504
Commands are composed of four parts: addresses, command identifier, parameter, end of command.
Some commands are used when the master is requesting
information from the controller, other when the master wants
to set a parameter in the process memory (RAM or EEPROM).
The end of commands corresponds to the CR char (0x0d).
The master software must send the command string with a
maximum delay of 20ms between each character.
The program on the master must not allow setting commands
other than keyboard or cleaning start/stop commands if the
general password has not been entered. After the general
password recognition through the “PWD” command, a 1minute time-out is let before the process meter locks again,
i.e. if the PC program waits for more than 1 minute between
two subsequent setting commands, the second one is not
fulfilled and the “PWD” command must be issued again.
60
Following is the complete list of commands available:
Command
Parameter
Remarks
NNMDR
not available
Requests firmware code
(always available)
NNHOP
not available
Requests hardware options
NNSNR
not available
Requests hardware identifier
(always available)
NNSTS
not available
Requests instrument status
(relays, LEDs, configuration
change flag, etc.)
NNPHR
not available
Requests last pH reading
(instrument configured for pH)
NNMVR
not available
Requests last mV reading
(always available)
NNTMR
not available
Requests temperature reading
(instrument configured for pH)
NNCAR
not available
Requests all last calibration data
(always available)
NNGET
CNN
NNPWD
C1C2C3C4
NNSET
NNEVF
Requests setup item C.NN.
Use the NNSNR command if
hardware identifier is needed.
(NNGET command is
answered with
“<ProcessID><CAN>”
for the hardware identifier)
Sends the general password
(always available)
CNNP1P2C1C2C3C4 Sets setup item C.NN with
parameter P1P2C1C2C3C4(*)
(not available in setup mode)
not available
Requests event log file
(available in idle, event
scrolling or last calibration data
scrolling mode w/control OFF)
61
Command
Parameter
Remarks
NNEVN
not available
Requests new events
(always available)
NNAER
not available
Requests active errors
(always available)
NNCLS
not available
To start advanced cleaning
(always available)
NNCLP
not available
To abort cleaning
(always available)
NNHLD
not available
To enter/exit the hold mode
(always available; pwd required)
NNKDS
null
Same as LCD key
NNKCD
null
Same as CAL DATA key
NNKUP
null
Same as key
NNKRG
null
Same as key
NNKST
null
Same as SETUP key
NNKCL
null
Same as CAL key
NNKDW
null
Same as key
NNKCF
null
Same as CFM key
NNK 02
null
Same as LCD+CAL+SETUP keys
(*) C1C2C3C4 are ASCII chars corresponding to the setup item
content; P1P2 are two additional bytes used for sign and half
digit as follows:
P1
=
+
if>0
P1
=
-
if<0
P2
=
0
if most significant digit is not used
P2
=
1
if most significant digit is used
When an item is shorter than 4 digits the Ci characters are
filled with blanks.
62
Following are examples for setup item format:
• item C.32, maximum relay ON time: parameter value =
15, format = “+015◊ ◊ “, where ◊ indicates a blank;
• item C.21, setpoint 2 value while in ORP mode: parameter
value = -1200 mV, format = “-01200”;
• item G.01, temperature compensation: parameter value
= “AtC”, format = “+0*AtC”.
For all items with a fixed set of choices, blank spaces on the
left of the value displayed are replaced with “*” (as many “*”
characters are needed to reach the maximum string length,
which is for example 3 for item C.57).
Blanks must be put on the tail for all items in order to have
always a total length of 6 characters (see the setup table).
The same parameter format used for setup item setting is
used also for setup item getting (i.e. when a
“NNGETCNN<CR>” command is received from the PC,
the reply “NN<STX>P1P2C1C2C3C4<ETX>” is sent back).
To perform a “NNSETCNN...” command the general password has to be sent in advance through the “NNPWD...”
command. See above for the password effectiveness time-out.
Some special setup items can not be set through RS485 commands. In particular it is not possible to access any setup
item that performs a test on the instrument and it is not possible to configure the hardware identifier (setup item G.12).
Note No validity check of the sent item value is done upon reception of a “NNSETCNN<CR>” command: this check is done
by Hanna HI 92500 software.
The “NNSET...” and “NNGET...” commands when used for
password items, baud rate, hardware identifier, F.00 and F.10
items, P.00 through P.09 items, are answered with
“NN<CAN>”.
As soon as the process controller realizes that a command
has been received, it sends one of the following answers:
1) “NN”, ACK (char 0x06) if the process controller recognizes the set command and performs the requested task;
2) “NN”, STX (char 0x02), DATA, ETX (char 0x03) if the re63
ceived command is a request of data;
3) “NN”, NAK (char 0x15) if the process controller does not
recognize the command or if the command syntax is wrong;
4) “NN”, CAN (char 0x18) if the process controller can not
answer to the request (e.g. the current process model does
not support the request, the given general password is
wrong, etc.)
The “NN” in the front of the answer is the Process ID
(“00” to “99”).
The time-out for the above answers is:
1) answer to “STS”, “PHR”, “MVR”, “TMR”, “AER” commands:
30 ms @ 19200 or 9600 bit/s, 40 ms @ 4800 bit/s, 60 ms
@ 1200 bit/s (for the complete answer, from STX to ETX).
2) answer to other commands: 2s (for the first character of the
answer).
The minimum delay between the last received and the first
sent character is 15 ms to allow the master to set itself into
receiving mode.
Here are descriptions of the answers format (for setup item
request see above):
The NNSNR request produces the following answer:
“NN<STX><7-character long ASCII string representing hardware identifier><ETX>” (e.g. “29<STX>1234567<ETX>” if
the Process ID alias RS485 address is 29 and the hardware
identifier is 1234567).
The NNGET command is answered with “NN<CAN>” when
used for the hardware identifier.
The NNMDR request produces the following answer:
“NN<STX>FP504XYZVV--ABCD<ETX>”
where VV is the firmware version, e.g.”10” for 1.0;
XYZ are the three model digits, e.g. XYZ=214 for dual setpoint,
ON/OFF and PID control, dual analog output;
AB is the first HI 92500 software version compatible with the
firmware, even if it may not be able to exploit all the features of
the firmware, e.g. “34” for 3.4;
CD is the first HI 92500 software version fully compatible with
this firmware, e.g. “45” for 4.5.
64
The NNPHR, NNMVR, NNTMR requests produce the following answer:
“NN<STX><ASCII string for a float>S<ETX>”
where S means “status” and can be equal to “A” (control and
alarm ON), “C” (control ON and alarm OFF), “N” (control
OFF).
The NNHOP request produces the following answer:
“NN<STX>C1C2C3C4<ETX>”
where C1C2 are the ASCII representation of byte B1 described
below (e.g. B1 = 0xF3 C1 = “F”, C2 = “3”), C3C4 are the
ASCII representation of byte B2 described below (e.g. B2 = 0x1D
C3 = “1”, C4 = “D”). The meaning of B1 and B2 is:
B2 bit 0 optional relay 2 (1: available; 0: not available)
B2 bit 1 Digital Transmitter input
(1: available; 0: not available)
B2 bit 2 PID control (1: available; 0: not available)
B2 bit 3 free for future use (and set to 0)
B2 bit 4 free for future use (and set to 0)
B2 bit 5 free for future use (and set to 0)
B2 bit 6 free for future use (and set to 0)
B2 bit 7 free for future use (and set to 0)
B1 bit 0 serial port (1: available, 0: not available)
B1 bit 1 serial port type (0: RS485)
B1 bit 2 analog outputs (1: available, 0: not available)
B1 bit 3 second analog output (1: available, 0: not avail
able; no meaning if bit 2 = 0)
B1 bit 4 optional relay 3 and relay 4
(1: available, 0: not available)
B1 bit 5 hold digital output (1: available)
B1 bit 6 4-20 mA input (1: available, 0: not available)
B1 bit 7 relay 1,2,3,4 type (0: electromechanical)
The answer to the NNSTS command is:
“NN<STX>C1C2C3C4<ETX>”
where C1C2 are the ASCII representation of byte B1 described
below (e.g. B1 = 0xF3 C1 = “F”, C2 = “3”), C3C4 are the
ASCII representation of byte B2 described below (e.g. B2 = 0x1D
C3 = “1”, C4 = “D”).
65
The meaning of B1 and B2 is:
B2 bit 0 alarm relay (1: energized, 0: de-energized)
B2 bit 1,2 red LED (bit 2 = 0 and bit 1 = 0: LED is OFF;
bit 2 = 1 and bit 1 = 0: LED is fixed
ON; bit 2 = 1 and bit 1 = 1: LED blinks)
B2 bit 3 relay #1 (1: energized, 0: de-energized)
B2 bit 4 relay #2 (1: energized, 0: de-energized)
B2 bit 5 relay #3 (1: energized, 0: de-energized)
B2 bit 6 relay #4 (1: energized, 0: de-energized)
B2 bit 7 hold digital output (1: ON, 0: OFF)
B1 bit 0 control (1: ON, 0: OFF)
B1 bit 1,2 setup mode (bit 2=0 and bit 1=0: not in setup
mode; bit 2=1 and bit 1=0: setup mode, view
only; bit 2=1 and bit 1=1: setup mode, unlocked)
B1 bit 3 calibration mode with device unlocked
(1: yes, 0: no)
B1 bit 4 setup updated (set to 1 after a device power-up or
a device reset or a change in setup made through
the instrument keyboard; reset to 0 after receiving
a GET command)
B1 bit 5 calibration mode (set to 1 after a device power-up
or whatever complete calibration; reset to 0 after
receiving a CAR command)
B1 bit 6 hold mode (1: ON, 0: OFF)
B1 bit 7 free for future use (and set to 0)
The NNCAR request produces the following answer:
1) Process controller configured for pH:
If pH is not calibrated: “NN<STX>0<ETX>”
If calibration has been performed: “NN<STX>1 date time offset
slope1 slope2 buf1 buf2 N<ETX>”
The items in italic are separated by blank spaces and have the
following formats:
date ddmmyy
(“020498” for April 2, 1998)
time hhmm
(“1623” for 4:23 pm)
offset ASCII string for a float (example: “-0.2”)
slope1 ASCII string for a float (example: “62.5”)
slope2 ASCII string for a float (example: “60.4”)
66
buf1 ASCII string for a float (example: “7.01”)
buf2 ASCII string for a float (example: “4.01”)
When some of the above items is missing (for example buf3 when
a 2-point calibration is performed) it is indicated with a “N” letter.
2) Process controller configured for ORP:
If mV is not calibrated: “NN<STX>0<ETX>”
If calibration has been performed: “NN<STX>1 date time N N N
buf1 buf2 N<ETX>”
The items in italic are separated by a blank spaces and have the
following formats:
date ddmmyy
(“020498” for April 2, 1998)
time hhmm
(“1623” for 4:23 pm)
buf1 ASCII string for a float (example: “0”)
buf2 ASCII string for a float (example: “1900”)
None of the items above can be missing when the Process Controller is configured to measure and control ORP (as it always has to be
calibrated on two points).
Note
When the “measurement input selection” item is set to “Digital Transmitter” the last calibration data retrieved through
this command refer to Digital Transmitter and is stored in that
device.
The event log file is requested through the NNEVF<CR>
command. The maximum length of the event log file is 100
records. Here is the format for the answer:
If there is no generated error or event, the answer has the format
“NN<STX>0<ETX>”, otherwise:
“NN<STX>events_no event_code1 start_date1 start_time1
end_date1 end_time1 desA1desB1 ...
event_code2 start_date2 start_time2 end_date2 end_time2
desA2desB2 ...
event_codem start_datem start_timem end_datem end_timem
desAmdesBm<ETX>”
where m is the number of events. Each token is followed
by a blank space, except the last one (“desBm”), directly
followed by the <ETX> character.
“events_no” is the number of events and its format is the
ASCII format for a number (“1”, “2”.... “99”, “100”).
67
The meaning of “start_datei” and “start_timei” is:
• for errors: date and time at which the error was generated;
• for setup events: date and time of a setup item change;
• for calibration events: date and time of a calibration;
• for cleaning events: start date and time of cleaning action.
The meaning of “end_datei” and “end_timei” is:
• for errors: end date and time if the error is not active anymore;
• for setup events: no meaning;
• for calibration events: no meaning;
• for cleaning events: no meaning.
The tokens format is described here below:
event_codei (errors)
event_codei (setup)
event_codei (calibration)
event_codei (cleaning)
start_datei
start_timei
end_datei (active errors)
end_datei (not active err.)
end_timei (active errors)
end_timei (not active err.)
desAi (errors)
desA1 (setup)
desAi (calibration)
desAi (cleaning)
desBi (errors)
desB1 (setup)
desBi (calibration)
desBi (cleaning)
ERNN
(e.g. “ER01” for Setp.1 alarm)
SCNN
(e.g. “Sr01” for current month)
CALE
(always the string “CALE”)
CLEA
(always the string ”CLEA”)
ddmmyy
(“010798” for July 1, 1998)
hhmm
(e.g. “1735” for 5:35 pm)
N
(just the letter “N”)
ddmmyy
(“020798” for July 2, 1998)
N
(just the letter “N”)
hhmm
(e.g. “0920” for 9:20 am)
N
(just the letter “N”)
P1P2C1C2C3C4 (setup item format, prev. value)
“XXPHX”, “XOrPX”, “XX^CX”, “4-20X”, “UOLtX”,
“0-201”, “4-201”, “0-202”, “4-202” (“4-20X”
is the 4-20 input channel)
“AdCL” for advanced cleaning,
“SICL” for simple cleaning
N
(just the letter “N”)
P1P2C1C2C3C4 (setup item format, new value)
N
(just the letter “N”)
N
(just the letter “N”)
See above in this section for the description of setup item
format “P1P2C1C2C3C4”.
Events are logged in the event log file in chronological order,
i.e. record number 1 refers to the oldest event. When the
event log file is full, the oldest event is replaced with the
oncoming one.
In order to speed up the updating of a remote monitor for the
events, the NNEVF<CR> command is supported by
NNEVN<CR>, the new event request command, which is
68
Note
Note
answered with the list of events occurred since the last reception of a NNEVF<CR> or NNEVN<CR> command.
Here is the format for answer to NNEVN<CR>:
“NN<STX>0<ETX>” if there is no new event, otherwise:
“NN<STX>new_events_no event_code1 start_date1
start_time1 end_date1 end_time1 desA1desB1 ...
event_code2 start_date2 start_time2 end_date2 end_time2
desA2desB2 ...
event_codem start_datem start_timem end_datem end_timem
desAmdesBm<ETX>”
where m is the number of events. Each token is followed
by a blank space, except the last one (“desBm”), directly
followed by the <ETX> character.
“new_events_no” is the number of new events and its
format is the ASCII format for a number (“1”, “2”.... “99”,
“100”).
When a NNEVF<CR> or NNEVN<CR> command is
received by the instrument, the new events list is reset and
a following NNEVN<CR> command will be answered
with “NN<STX>0<ETX>” if no event took place in the
meantime. Thus, if the answer to NNEVN<CR> command is not received correctly, to update a remote monitor
for events, the NNEVF<CR> command for the whole
event log file must be used.
After a reset of the instrument, the answer to NNEVN<CR>
is the same as NNEVF<CR> (all events are new).
A modified record due to the closing of an error is not transmitted by NNEVN<CR>, so again the NNEVF<CR> command is needed.
A small subset of the event log file, with information about
the active errors, can be downloaded through the
NNAER<CR> command, always available, even during controlling. The answer is:
“NN<STX>C1C2C3C4C5C6<ETX>”
where C1C2 are the ASCII representation of byte B1 described
below (e.g. B1 = 0xF3 C1 = “F”, C2 = “3”), C3C4 are the
ASCII representation of byte B2 described below (e.g. B2 = 0x1D
C3 = “1”, C4 = “D”), C5C6 are the ASCII representation of
byte B3 described below (e.g. B3 = 0xBE C5 = “B”, C6 =
“E”).
69
The meaning of B1, B2, B3 is:
Alarm for setpoint 1
B3 bit 0
B3 bit 1
Alarm for setpoint 2
Maximum relay ON time exceeded
B3 bit 2
B3 bit 3
Life check error
B3 bit 4
pH electrode broken or leakage
B3 bit 5
Reference electrode broken or leakage
B3 bit 6
Old pH probe
Dead pH probe
B3 bit 7
B2 bit 0
Calibration timeout
B2 bit 1
Temperature probe broken
free for future use (and set to 0)
B2 bit 2
B2 bit 3
Digital transmitter error
B2 bit 4
Power reset
EEPROM corruption
B2 bit 5
B2 bit 6
Watchdog reset
B2 bit 7
free for future use (and set to 0)
B1 bit 0
free for future use (and set to 0)
B1 bit 1
free for future use (and set to 0)
B1 bit 2
free for future use (and set to 0)
B1 bit 3
free for future use (and set to 0)
B1 bit 4
free for future use (and set to 0)
B1 bit 5
free for future use (and set to 0)
free for future use (and set to 0)
B1 bit 6
B1 bit 7
free for future use (and set to 0)
Note
Note
Note
70
Each bit is equal to 1 if the correspondent error is ON
and equal to 0 if the correspondent error is OFF.
After issued the NNHLD<CR> command to enter the hold
mode, the command has to be issued again for exit from the
mode. If the device is already in hold mode when the
NNHLD<CR> is issued the first time, the command has no
effect.
When a “NAK” or “CAN” char is sent, the whole process
reception buffer is cleared.
When the meter is receiving and answering to commands
other than “PHR”, “MVR”, “TMR”, “AER”, “STS”, the primary LCD displays “r485”.
SHORT MESSAGING SERVICE (SMS)
It is possible to connect the Hanna HI 504900 GSM module to the RS485 port of the instrument. This connection enables
the instrument to send SMSs to one (or two) cellular phone(s)
and through this feature the device can be monitored at every moment. Moreover if an error occurs on the HI 504, it is
possible to have an SMS sent to the cellular phone(s) advising immediately the user about the problem.
To use the SMS feature, a SIM card able to make voice
calls must be used.
The SMS feature can be enabled through the setup item P.00
by selecting “CELL” for cellular module connection instead of
“PC” connection.
Note
Before enabling this feature it is necessary to enter the PIN of
the SIM card of the GSM module (setup item P.01) and one
or two phone numbers associated with the service (setup items
P.02 and P.03) to which the messages will be sent.
The phone numbers have to be inserted using the international format excluding the starting “+” character and without
any space inside the number. For example if the cellular number is “+39123456789” (+39 is the country code), the
number to be stored in the HI 504 is “39123456789”.
When the item P.02 (or P.03) is selected,
the primary display will show the first
four digits of the correspondent phone
number. A minus sign is added in the
front of the number to indicate that the
first four digits are shown and the first digit will blink to indicate the possibility to modify the value.
The user can select the desired digit using the or key.
“-” character indicates that the digit is not used (leave dashes
on the right of the number).
71
By pressing the key, the first digit will be fixed on and it will
be possible to select the next digit.
When the fourth digit is reached, by pressing the key again,
the number on the primary display will scroll of one position
to the left and the fifth digit of the phone number will be
shown on the fourth position. The minus sign in the front of
the number disappears because the shown digits are not the
first four ones anymore.
By pressing the or key it is possible to modify the value
of the blinking digit and pressing the key it is possible to
skip to the next digit. When the end of the phone number is
reached, the user has to fill the remaining positions with “-”
character.
The space reserved for a phone number is of 20 digits. When
the last position is reached, by pressing the key, the primary display will return to the first four digits (recognizable by
the minus sign in the front of the number). In this way it is
possible to run cyclically through the number by pressing
repeatedly the key.
72
When the desired phone number is entered, press CFM to
confirm.
The WRONG tag will blink if the user tries to confirm an
incorrect number (the first digit of the number has to be on
the first position and the “-” character have not to be present
in the middle of the number). The WRONG tag will disappear only when a digit of the phone number is modified.
Note
Two cases have to be distinguished when the cellular module
connection is selected.
1) If one or two phone numbers have been set in items P.02
and P.03, then when the connection is activated (when
“CELL” is confirmed on item P.00), the two numbers will be
saved on the SIM card of the instrument with the codes
“HI504PH1” and “HI504PH2” and the GSM module initialized.
During the saving of the phone
numbers, “CELL” and the MEM
tag will blink alternatively on the
LCD.
The numbers are saved on the first two locations of the
phonebook area in the SIM card. If there are other phone
numbers previously stored on these locations, they will be
overwritten. If only one phone number is entered in item P.02
(or P.03) then the location correspondent to the other number on the SIM card phonebook area will be automatically
erased.
2) On the other case, if no phone number has been set in
items P.02 and P.03 (both the items filled with “- - - - - - - - - - - - - - - - - - -”), then when the connection is
activated (when “CELL” is confirmed on item P.00) the instrument tries to read the SIM card looking for some number associated with the code “HI504PH1” or “HI504PH2”
(previously saved by the instrument on the SIM card). If it
finds any, then the phone number(s) will be loaded by the
instrument (items P.02 and P.03 automatically updated),
73
Note
the cellular module initialized and
the SMS service activated. During
the reading of the SIM card, “CELL”
and the MEM tag will blink alternatively on the LCD.
Otherwise, if the instrument does
not find any correct number, then
it will not be possible to activate
the SMS service and the WRONG
tag will blink on the LCD.
If the PIN set in P.01 is wrong, then it will be not possible to
confirm the cellular module connection.
If the first attempt to initialize the GSM engine fails because
of a wrong PIN, then no other attempt will be allowed until
the setup item P.01 is modified (prevention of sending three
wrong PINs. Infact if it happens, the user has to extract the
SIM card and manually enter the PUK using his own cellular
phone to unlock the SIM card).
The communication baud rate is set through the item O.30
and it is the same both for a “PC” connection and for the HI
504900 GSM module connection. Normally there is no need
to modify the default baud rate (19200).
Note
It is important to set the desired baud rate before enabling
the SMS service. The GSM cellular mode will automatically
recognize the baud rate during the initialization. Once activated the SMS service, it is important NOT to change the
baud rate during the normal functioning of the instrument.
If a baud rate changing is required, first switch setup item
P.00 to “PC”, then change the baud rate (setup item O.30),
and finally reactivate the SMS service switching item P.00 to
“CELL”.
To have an error associated with the SMS service, the user
has to select a proper configuration in the Error group (see
“Setup mode” section).
When an error configurated for the SMS service is switched
on, the following message will be sent to the programmed
phone numbers: “Rem_msg: xxx; The following error occurred
on HI504: XXXXX”.
“xxx” stands for a three digits number indicating the remaining messages; “XXXXX” stands for a text string correspondent
74
to the activated error.
Here is reported a list of all the possible error strings:
• “Alarm for setpoint 1”
• “Alarm for setpoint 2”
• “Max relay ON time error”
• “Life check error”
• “pH electrode broken or leakage”
• “Reference electrode broken or leakage”
• “Old pH probe error”
• “Dead pH probe error”
• “Calibration timeout error”
• “Temperature probe broken error”
• “Analog input error”
• “Digital transmitter error”
• “Power reset error”
• “Cellular error”
• “EEPROM corruption error”
• “Watchdog error”
After the submission of the message, a phone call is made by
the instrument to the programmed number(s). This is done
because the SMS can be received with a considerable delay
due to network overload, while the phone call takes place
immediately and has a long ring which is more likely to be
heard. The phone call advises the user that something happened on the HI 504 and a SMS is going to be received. It
is not necessary for the user to answer the phone call and it is
suggested to close it without any answer.
When an error occurs, a confirmation of the message reception is waited by the instrument. The confirmation can be
done by the receiver simply calling the HI 504 phone number (number of the GSM module). The instrument will answer
and send an SMS with its current status (this confirmation is
managed as an information request; see further on for details).
It is possible to configure the instrument to have repeated
messages sent if confirmation is not received immediately (see
items P.05 and P.06). This user-selectable feature has been
introduced to prevent losing of the warning message due for
example to overload of the telephone lines. The P.05 item sets
the number of repeated messages to send (0 is associated
75
with no repetition: only one warning message will be sent
and no confirmation waited), while the P.06 item sets the
delay (in minutes) between two subsequent messages.
When the instrument receives a phone call (coming from
one of the programmed cellular numbers), it interprets the
calling as an information request and answers hanging up
and sending an SMS with its current status report (number of
remaining messages, pH or ORP and temperature values,
current active errors). The message will be as for example:
“Rem_msg: 150; pH: 8.32; Temp: 25.8; Alr set1; Rel on”.
The maximum number of characters for an SMS is 160, so
that, if many errors are active, it is possible that the message
be truncated. To avoid this problem, a coded notation is
used to identify the active errors.
Here is the list of the error strings coded notation:
• Alarm for setpoint 1: “Alr set1”
• Alarm for setpoint 2: “Alr set2”
• Max relay ON time error: “Rel on”
• Life check error: “Life chk”
• pH electrode broken or leakage: “pH brk”
• Reference electrode broken or leakage: “Ref brk”
• Old pH probe error: “Old prb”
• Dead pH probe error: Dead prb”
• Calibration timeout error: “Cal tout”
• Temperature probe broken error: “Temp brk”
• Analog input error: “Anlg in”
• Digital transmitter error: “Tx err”
• Cellular error: “Cell err”
• Power reset error: “Pwr rst”
• EEPROM corruption error: “EEPr cor”
• Watchdog error: “Wtc dog”
If no error is active, then the correspondent string will be:
“No error”.
If at the information request the instrument is in Hold mode,
the “Hold” string is added before the pH (or ORP) indication. If the instrument is performing a cleaning action, The
“Cleaning” string is added before the readings information.
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Note
Note
The information about SIM charge and expiration date are
not saved in the SIM card but are managed by the network
operator; the instrument can not get directly the information.
To prevent the discharge of the SIM card, the user has to
configure manually (accordingly with the credit stored on the
SIM card) the maximum number of SMSs that can be sent
(item P.04).
Every time an SMS is submitted, the item P.04 is updated and
it will always indicate the remaining number of messages that
can be sent by the instrument.
When the number of remaining messages is going to reach
zero (the lower limit depends on the value of item P.05), the
message “Rem_msg: xxx; Maximum number of Sms reached.
Please check the HI 504 SIM card charge level” will be sent
by the instrument to the programmed phone number(s). This
particular situation is managed as an error occurrence and
a confirmation of the SMS reception is waited.
In this case the user is supposed to extract the SIM card from
the cellular module as soon as possible and to check the
remaining credit (using its own cellular phone and calling
the network operator).
When a confirmation is given to the message, the “Cellular
error” is switched on and no more messages will be sent by
the instrument in case of error occurrences. To disactivate the
“Cellular error”, it is necessary to modify the item P.04.
Every time a recharge of the cellular module SIM card is
performed, the corresponding expiration date has to be manually updated in the Setup menu (items P.07 - P.09). A check is
performed daily between the current (see “Real time clock”
subgroup in Setup menu) and the expiration date. Two weeks
before the expiration date, the message “Rem_msg: xxx; The
HI504 SIM card will expire on: DD-MM-YYYY. Please recharge
or substitute it” is sent to the programmed phone number(s).
The same message will be sent again also one week before,
and the day before the expiration date.
This particular warning message does not need confirmation.
In this case the user has to recharge or substitute the SIM
card. The sending of the repeated warning messages will be
77
reset when the expiration date is changed. If the expiration
date is reached without any updating of the items P.07 - P.09,
then the “Cellular error” will be switched on and no more
messages will be sent by the instrument until the error is
disactivated.
To disactivate this error it is necessary to update the SIM expiration date.
If the user has unlimited credit on the SIM card, the item P.04
has to be set to “222”, which is interpreted by the instrument
as unlimited number of SMSs that can be sent. In this case
the value of remaining messages will not be decremented
and no check will be performed on the SIM card expiration
date. Moreover, at the beginning of each SMS it will not be
present the remaining-messages information (“Rem_msg:
xxx”).
Note
Note
Note
78
It is possible to ask information (about the current pH, ORP
and temperature readings and active errors) to the HI 504
also from a cellular phone different from the one(s) selected
through the item P.02 (and P.03). This is accomplished by
sending to the instrument the SMS “+Pxx”, where “xx” indicates the ID of the HI 504 (setup item G.11).
The instrument will recognize the command and reply sending the requested information.
If a communication problem occurs during the normal functioning of the instrument, the “Cellular error” will be switched
on and no SMS can be submitted until this error will be
disactivated (when this error occurs, the instrument will try
repeatedly to initialize the cellular engine and the error will
be disactivated only after a successful initialization, or if the
SMS service is disabled by setting item P.00 to “PC”).
All the settings of the SMS group in the Setup menu are the
same for both pH and ORP configuration.
MODEM CONNECTION
A modem connection can be established between HI 504
and a remote computer over a telephone line. The connection with a standard modem allows the user to ask the
controller from a remote position about its status, measurements and to change some parameters, while for receiving
alarm indications it is necessary to install the HI 504900
GSM module.
Setup item O.31 (“Modem calls answer enable”) must be set
to “On”.
When using the Hanna HI 504900 cellular module, it has to
be enabled by setting P.00 to “CELL” (in addition to O.31 set to
“On”); when using a standard modem, set P.00 to “PC”.
A SIM card able to receive data calls must be used.
Many devices can be monitored through a remote modem
connection, simply connecting all the devices and the modem (or Hanna cellular module) to the same RS485 network.
Only one device has to be configured through O.31 to answer to modem calls. That device will be the one controlling
the modem (or cellular module). To avoid conflicts, the following must never be done:
• put more than one modem or GSM module in the same
RS485 network;
• set O.31 to “On” in more than one device in the same
RS485 network;
• set P.00 to “CELL” in more than one device in the same RS485
network (SMSs can not be sent from more than one HI 504);
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• set O.31 to “On” in one device and P.00 to “CELL” in
another one within the same RS485 network;
• put a PC monitor within the RS485 network.
Provided the above, any Hanna instrument with RS485 port
can be attached to the network and monitored remotely.
The modem must be configured (only once while setting up
the network) through a PC with an RS232 terminal program
(as HyperTerminal) or Hanna HI 92500 application software (“Options” menu : “Configure modem”). That configuration is performed automatically by HI 504 for the GSM
module. The string to be sent to the modem for configuring it
is: “AT&F0V1&D0&C0&S0X3E0&K0&Y0&W0<CR>”, (<CR>
= Carriage Return). In case the above command causes an
error in the modem answer, then it has to be divided into
smaller pieces: “AT&F0<CR>”, “ATV1<CR>”,
“AT&D0<CR>”, “AT&C0<CR>”, “AT&S0<CR>”,
“ATX3<CR>”, “ATE0<CR>”, “AT&K0<CR>”,
“AT&Y0<CR>”, “AT&W0<CR>”. This is needed because if
during processing of AT commands in the same line one of
them leads to an error, the following commands are not processed. After slicing the configuration string into pieces, send
them all to the modem one by one till the end, even if one or
more of them give errors. The connection may be established
and work well even if some error occurs during configuration.
When making a call, after the data connection is established,
the “NNPWD...” command (where “NN” is the address of the
device controlling the modem, i.e. the one with O.31 set to
“On”) must be issued by the remote computer within 15 seconds.
When the data connection is up, the RS485 protocol for a
remote connection is all the same as for a local network (see
the previous section). An automatic disconnection takes place
if no character is received in the RS485 network in 3-4 minutes.
When a modem connection is up, the cellular module does
not send any SMS. If an error for which the SMS sending is
enabled is active after closing the modem connection, an
alarm SMS will be sent by the HI 504 after disconnection.
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pH/ORP PROBE CHECK
Note
Note
The pH electrode and the reference electrode for both pH
and ORP can be automatically monitored through HI 504.
Setup items involved are I.13 (pH electrode impedance test
enable), I.14 (reference electrode impedance test enable),
I.15 (maximum reference electrode impedance) and I.04 (potential matching pin enable).
A “pH electrode broken or leakage error” (error code: 10) is
generated whenever the pH electrode impedance is less than
approximately 1 MΩ. This error can be due to breakage of the
electrode glass or short circuits caused by moisture or dirt.
A “reference electrode broken or dirty or not immersed” error
(error code: 11) is generated whenever the reference electrode impedance is greater than the value set in item I.15
(maximum reference electrode impedance range is 0.5 to
100.0 KΩ, default is 50.0 KΩ). This error can be due to
soiling of the reference electrode. It can occur also when
either the reference electrode or the matching pin are not
immersed in the solution. An automatic cleaning procedure
can be triggered by this error (see the “Alarm - Error configuration” section for more details).
The pH electrode test is performed when the following conditions are satisfied:
• the test has been enabled through the setup item I.13;
• the device is in one of the following modes: idle, last calibration data scrolling, event log file scrolling;
• the device is not in hold mode;
• the device is configured to measure pH.
If an amplified electrode is used, the pH electrode test
must be disabled through the setup item I.13.
The reference electrode test is performed when the following
conditions are satisfied:
• the matching pin has been enabled through the setup
item I.04;
• the test has been enabled through the setup item I.14;
• the device is in one of the following modes: idle, last calibration data scrolling, event log file scrolling;
• the device is not in hold mode.
When testing or calibrating the instrument through a
pH/ORP simulator like HI 931001 or HI 8427, temporarily set the items I.13 and I.04 to “OFF”.
81
SOLUTION COMPENSATION
The instrument is provided with a solution compensation function which can be enabled through setup menu (setup item
S.00). This function is a compensation curve (actually a line)
defined through 2 couples of pH and temperature values:
• point #1: pH1 , T1
• point #2: pH2 , T2
The only restriction on the values of pH and temperatures is
|T1-T2| U 1.0°C.
When the solution compensation is enabled, the pH reading
will be equal to:
pH (with solution compensation) = pH (without solution compensation) + [(pH1-pH2)/(T1-T2) x (25-T2) + pH2] - [(pH1-pH2)/
(T1-T2) x (T-T2) + pH2]
where T is the current temperature reading (Celsius degree
units).
With this kind of compensation formula, the pH value with
solution compensation will be the same (i.e. (pH1-pH2)/(T1T2) x (25-T2) + pH2) at point #1 and point #2.
This solution compensation feature is useful, for example, in
the following case:
HI 504 is measuring pH=pH1 at temperature T1; a sample
is taken out and carried in the laboratory room to be checked
with a reference pH-meter; in the meantime the temperature
decreases to T2 and also the pH value measured with the
reference pH-meter changes to pH2 (due to the chemical
properties of the solution); if the same solution compensation
formula is applied in both HI 504 and the reference pHmeter, they will read the same value.
To enable the solution compensation, set the S.00 item in the
setup menu to “ON”.
The solution compensation is disabled in any case when calibrating pH.
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TEMPERATURE COMPENSATION
If the setup item G.01 is set to “AtC” an automatic temperature compensation will be performed using the temperature
value acquired with the Pt100/Pt1000 input.
If the probe appears to be unconnected, or anyway it does
not give a valid temperature (temperature outside the -30 to
130°C range), the instrument will generate a broken temperature probe error, which will be handled as stated in the
error configuration. In this case the temperature will be automatically set to the setup item G.02 (“Manual or probe error
temperature”) and the setup item G.01 will be automatically
set to “USEr” (see below).
After that, the Pt100/Pt1000 input continues to be monitored
to track the Pt100/Pt1000 error closing.
The setup item G.01 is automatically changed back to “AtC”
when the Pt100/Pt1000 error is closed.
During error condition, if the user decides to start working in
manual mode (and so manually close the error), he has to
go in setup menu (item G.01), change the value to “AtC”
(automatic compensation) without giving confirmation, then
change again to “USEr” and finally give confirmation by
pressing the CFM key.
If the setup item G.01 is set to “USEr” a manual temperature
compensation will be performed, no matter whether the temperature probe is connected to the Pt100/Pt1000 input or
not.
The start value for temperature, when entered the manual
mode, is the one stored at G.02 (“Manual or probe error
temperature”).
If the user wants to change the temperature value while in
manual mode, he has to press the or key. Pressing once
the key it will add 0.1°C to the actual temperature value,
while pressing the key it will subtract 0.1°C.
83
For quickly changing the temperature value press and hold
down the (or ) key: the temperature will be incremented
(decremented) of 0.1°C until the total amount is 0.4°C, and
then the increment (decrement) will turn to 1°C.
During these operations both the temperature value displayed
and setup item G.02 are updated (the last one is updated
with a maximum delay of 10s).
Note
84
When the Digital Transmitter is used, the temperature compensation is performed in the transmitter.
LAST CALIBRATION DATA
If the meter is set as pH controller, the following data about
the last calibration are stored in the EEPROM:
• Date
• time
• offset, in mV
• slope, in mV/pH
• up to two buffers.
If the meter is set as ORP controller, the data stored in the
EEPROM are the following:
• Date
• time
• first calibration point
• second calibration point.
While displaying these data the pH/ORP controller remains
in control mode.
To enter the last calibration data
mode, press the CAL DATA key.
If the meter has never been calibrated
or an EEPROM reset has occurred, no
calibration data is shown when CAL
DATA is pressed. The “no CAL” message will blink for a few seconds, then
the meter skips back to the previous
mode.
If the meter is set as pH controller, once entered the last calibration data, the following messages could scroll twice on
the primary LCD before showing the calibration date:
• “Old probe”
• “Dead probe”
• “Probe needs calibration”.
Otherwise the last calibration date will
appear on the primary LCD displayed
as DD.MM format, while the secondary display will show the last two digit
of the year.
85
Pressing the key, the meter will cycle through the following
steps in reverse order, i.e. beginning from last buffer.
Note
At any time pressing LCD or CAL DATA key the meter will
return to the regular operating display.
• Press the or key to view the
time of last calibration. The secondary display will show “HOU” to
indicate “hour and minute” while the
primary LCD will show the time as
HH:mm format.
• Press the or key again to view
the offset in mV at the time of last
calibration. The secondary display
will show “OFF” to indicate “offset”.
• Press the or key again to view
the slope in mV/pH at the time of
last calibration. The secondary display will show “SLO” to indicate
“slope”.
• Press the or key again to view
the first memorized buffer at the time
of last calibration. The secondary
display will show “BUF1” to indicate
“first buffer”.
• Press the or key again to view
the second memorized buffer (if
present) at the time of last calibration. The secondary display will show
“BUF2” to indicate “second buffer”.
• Press the or key again to return to the first CAL DATA display
(date) at the time of last calibration.
Note When the “Measurement input selection” item is set to “Digital Transmitter” the displayed last calibration data refer to the
Digital Transmitter and is stored in that device. This does not
mean that the calibration data of the process controller are
lost, but they come back when changing back the “Measurement input selection” later.
86
OFFSET AND SLOPE DIRECT SELECTION
It is possible to edit directly the values of the offset and the
slope to calibrate the instrument.
• Press the CAL DATA key entering the last calibration data
scrolling and then press the SETUP key.
• A password entry is required. If a wrong password is confirmed, the instrument reverts back to the normal mode.
• Otherwise, if correct password is confirmed, the LCD will appears as
follows: the secondary LCD shows
“OFF” to indicate “offset” while the
primary one shows offset default
value. The first digit on the primary
LCD is blinking, and it is possible to
change it by pressing or key.
• Pressing the key will move to the
second digit while the first one will
be fixed.
• Pressing repeatedly the key will move cyclically through
the digits of the primary LCD.
• Once selected the desired value, press CFM to confirm the
calibration offset.
• If the offset is invalid, the “WRONG”
indicator will blink on the display.
Note
If LCD or CAL DATA key is pressed before CFM, calibration
is aborted without changing the previous calibration data.
87
• If an offset calibration has been
made, the instrument will turn to
“slope” calibration (as indicated by
the “SLO” message on the secondary display. The slope value is shown
on the primary LCD and the first digit
is blinking to permit modifications).
• Press the or key to modify the value or key to move
to the next digit.
• Once selected the desired value, press CFM to confirm.
• After confirmation the instrument will turn back to normal
mode.
• If the slope is invalid, the ”WRONG” indicator will blink
on the LCD.
88
Note
Press LCD or CAL DATA key to exit calibration. The slope will
be set to the default value (57.5 mV/pH).
Note
After direct selection of offset and slope, calibration data can
be viewed by pressing the CAL DATA key while in normal
mode, but no pH-buffer values will be displayed during the
data scrolling on the LCD.
EVENT LOG FILE SCROLLING
The event log file is composed by a maximum of 100 recorded events, which include errors, calibration events (type
of calibration, date, time), configuration changes and cleaning events (type of cleaning, start date and time).
To enter the event log file scrolling, press the LCD key while in
control, hold or idle mode (the log feature is not available in
setup or calibration mode). Event scrolling does not affect
control actions, which continue normally.
If there is no event in the event log file, nothing happens
when the LCD key is pressed.
Otherwise the primary display will show
the code of the last logged event while
the secondary LCD will show the number (index) of the event.
For each event the following is reported in any case:
• error code (displayed “Er” followed by the error number)
or setup item code (displayed “S” followed by the setup
item code) or “CALE” indication or “CLEA” indication;
• event index (the oldest event has index 0, the latest event
has the higher index) shown on the secondary LCD.
In addition, the following information can be visualized:
• for errors: • start date
• start time
and if error is not on anymore:
• end date
• end time.
• for configuration changes:
• date of change
• time of change
• previous value
• new value
• for calibrations:
• date of calibration
• time of calibration
• calibrated unit (“pH”, “OrP”, “°C”, “4-20”,
“UoLt”, “0-20 1”, “4-20 1”, “0-20 2”, “4-20 2”)
89
• for cleaning events:
• start date
• start time
• type of cleaning (“AdCL” for advanced
cleaning; “SICL” for simple cleaning).
Once entered the log event scrolling, press the or key to
move through the events.
If the event is an error still active, the error code on the primary LCD will blink, otherwise it will be fixed.
To have a look at the additional information of a selected
event press the key (it will cycle through the additional
information).
Note
To exit the log event scrolling, press the LCD key.
Note The logged event information can be downloaded to a PC
through the HI 92500 application software.
90
FAULT CONDITIONS
The below fault conditions may be detected by the software:
• EEPROM data error
• serial communication internal bus failure
• software dead loop.
EEPROM data error can be detected through EEPROM test
procedure at start-up or when explicitly requested using setup
menu, or during normal operational mode if a checksum
control fails.
When an EEPROM error is detected during normal mode, a
fault alarm is generated according to the user configuration
for the EEPROM corruption error (see “Alarm” section).
To close an error an EEPROM test (see “Selftest procedures”
section) or reset is required.
As soon as an EEPROM error is detected, the scrolling message “EEPROM reset needed - Press up button to reset stored
data or right button to ignore” will appear on the primary
LCD.
If the key is pressed, the process controller restarts operation, but alarm actions are performed as configured by the
user (see “Alarm - Error configuration” section). Note that
the device will be in Hold mode in any case.
If the key is pressed, all the data stored in the EEPROM are
erased and the default values loaded. After that, the device
must be completely recalibrated.
An internal bus error is detected when internal transmission
is not acknowledged or a bus fault occurs for more than a
certain number of unsuccessful transmission attempts (due
for example to a damage occurred to one of the ICs connected to the internal bus). After that the controller displays a
sliding message “Serial bus error”.
91
If the error is due to impossible communication with the
EEPROM or the RTC, all the pH/ORP controller tasks are
stopped, the alarm relay is de-energized, the red LED blinks
and the “Serial bus error” slides forever (repair can not be
postponed).
A software watchdog is provided in order to detect dead loop
conditions or other causes that make the software stuck. If it
happens, a software reset is generated after a time-out of 1
second.
SELFTEST PROCEDURES
The selftest procedure can be made only entering the setup
menu and selecting one of the items of the “tESt” group (t.00
- t.08).
Note
All the tests are made while in setup mode, where a time-out
is present. If no action is performed for about 5 minutes, the
mode is automatically exited and the instruments returns to
previous mode.
DISPLAY TEST
The display selftest procedure consists of lighting up all the
display segments together.
• To start the procedure select setup
item t.00 and an “OFF” blinking message will appear on the
primary LCD.
• Press the (or ) key once and
the message will switch to a blinking “GO”.
• Press CFM key to confirm or the
(or ) key again to return to
the previous status.
• If confirmation is given when the
“OFF” message is blinking, no action is performed and it will move
to the next setup item (t.01).
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• The display test is announced by a scrolling “Display test”
message.
• All the segments light up for a
few seconds and then switch off
before exiting the display test procedure and moving to the next
setup item (t.01).
KEYBOARD TEST
• To enter the keyboard test procedure select setup item t.01.
A blinking “OFF” message will appear on the primary LCD.
• Press the (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM to confirm or the (or ) key again to return
to the previous state.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the next
setup item (t.02).
• Once confirmed, the keyboard selftest procedure begins
with the scrolling message “Button test - Press LCD and
CAL and SETUP together to escape”.
• The LCD will then show only a
colon.
• As soon as one more key is pressed, the appropriate segment out of 88:88 corresponding to the pressed key will
light up on the screen.
93
For example, if SETUP and keys are pressed together the
LCD will look like this:
Note
A maximum of two keys may be pressed simultaneously to
be properly recognized.
• To exit the keyboard test procedure press LCD, CAL and
SETUP simultaneously; the instrument will remain in the
setup menu and move to the next item (t.02).
EEPROM SELFTEST
The EEPROM selftest procedure involves verifying the stored
EEPROM checksum.
• To enter the EEPROM test procedure select the setup item
t.02 and an “OFF” blinking message will appear on the
LCD.
• Press the (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM key to confirm or the (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the next
setup item (t.03).
• After confirmation, the selftest procedure begins with the “tESt”
message blinking for a few seconds.
94
• During this time the instrument performs the EEPROM check,
and if the checksum is correct, the “Stored data good”
message will scroll on the primary display.
• After that, the meter will remain in setup menu and move to
the next setup item.
• If the checksum fails, a fault alarm is generated and the
following message appears on the LCD: “Stored data error
- Press “UP” button to reset stored data or “RIGHT” button
to ignore”.
• If the key is pressed the process controller restarts operation, but alarm actions are performed as configured by the
user (see “Alarm - Error configuration” section).
Note that the device will be in Hold mode in any case.
• If the key is pressed, all the data stored in the EEPROM
are erased and the default values loaded.
• Once performed the selected action, the instrument will
remain in the setup menu and move to the next setup item
(t.03).
RELAYS AND LEDS TEST
• To enter the relays and LEDs test procedure select the setup
item t.03 and an “OFF” blinking message will appear on
the LCD.
• Press the (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM key to confirm or the (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the next
setup item (t.04).
• Once confirmed the test, all the relays and LEDs (if anyone
was active) are switched off and the message “Relays and
LEDs test - Press CFM to escape” will scroll on the primary
LCD during all the test.
95
• Some keys are used to toggle relays and LEDs ON and
OFF:
- the LCD key toggles the alarm relay and the alarm LED;
- the CAL DATA key toggles the red LED;
- the key toggles relay 1 and the corresponding LED;
- the key toggles relay 2 and the corresponding LED;
- the SETUP key toggles relay 3 and the corresponding LED;
- the CAL key toggles relay 4 and the corresponding LED;
- the key toggles the digital insulated hold output.
• LEDs are verified simply by looking at them, while relays
can be verified through a multimeter set for continuity test.
• To exit the test press the CFM key and the previous configuration of the relays is reestablished. The instrument will remain
in the setup menu and move to the next setup item (t.04).
ANALOG OUTPUT TEST
The analog output test is done through the setup items t.04
(analog output 1) and t.05 (analog output 2).
• To enter the analog output test procedure select the corresponding setup item and an “OFF” blinking message will
appear on the LCD.
• Press the (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM key to confirm or the (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the next
setup item.
• Once confirmed the test, a start output value (mA) is proposed and displayed on the primary
LCD. This value is let out to the analog output and coincides with the
minimum value of the analog output type chosen with setup item O.11
96
(analog output 1) and O.21 (analog output 2).
• A new output value can be edited manually. It is possible
to change the value of the first blinking digit by pressing
the or key.
• To move to the next digit press the key once; the first digit
will be fixed and the second one will start blinking.
• Pressing repeatedly the key will result in cycling through
the digits on the primary LCD.
• Once a value is selected, the corresponding current is
immediately erogated by the selected output and no confirmation is required.
• The minimum and maximum values let out are 3.6, 22 mA
for the 4-20 mA output and 0, 22 mA for the 0-20 mA
output. This depends on the possibility of the fault currents
to be let out (see “Alarm - error configuration” section for
more details).
• To verify the erogated current use a multimeter connected
to the corresponding output.
• To exit the test press the CFM key; the instrument will remain in the setup menu and move to the next setup item.
HOLD DIGITAL INPUT TEST
This test is made to verify if the instrument recognizes the
digital input signal at the hold input.
• To enter the test procedure select the setup item t.06 and an
“OFF” blinking message will appear on the LCD.
• Press the (or ) key once and the message will switch to
97
a blinking “GO”.
• Press CFM key to confirm or the (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the next
setup item (t.07).
• Once the test is confirmed, the primary LCD will display the “HOLd”
message, while the secondary LCD
shows the status (“OFF” or “On”)
of the digital input corresponding to
the hold command.
• Toggle the digital input between high and low levels and
verify the corresponding status on the secondary LCD.
• To exit the test press the CFM key; the instrument will remain
in the setup menu and move to the next setup item (t.07).
ADVANCED CLEANING DIGITAL INPUT TEST
• To enter the test procedure select the setup item t.07 and an
“OFF” blinking message will appear on the LCD.
• Press the (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM key to confirm or the (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the next
setup item (t.08).
• Once the test is confirmed, the
“ACLE” message will appear on the
primary LCD, while the secondary
LCD shows the status (“OFF” or
“On”) of the digital input corresponding to the advanced cleaning.
• To perform this test, relays #3 and #4 have to be configured for the advanced cleaning, otherwise the cleaning
will never start and on the secondary display is indicated
the digital input status only.
• To avoid continuous cleaning it is necessary to configure
the minimum pause time between two consequent clean98
ing (setup item L.14).
• To exit the test press the CFM key; the instrument will remain in the setup menu and move to the next setup item
(t.08).
Note
During the test the relays are activated, the primary LCD will always
show the “ACLE” message and on the secondary display will be
shown the actual status of the digital input (“On” or “OFF”).
WATCHDOG TEST
This test executes a dummy dead loop that causes a watchdog reset signal to be generated.
• To enter the test procedure select the setup item t.08 and an
“OFF” blinking message will appear on the LCD.
• Press the (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM key to confirm or the (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blinking, no action is performed and it will move to the beginning
of the test setup menu.
• Once confirmed the test, the “Reset test” message will scroll
once on the primary LCD, and then the start-up procedure
is initiated.
99
ALARM - ERROR CONFIGURATION
Note
100
This section is dedicated to all the possible error causes for
alarm generation, and to the actions performed according to
the alarm configuration (setup menu “Error configuration”).
Each alarm cause can be referred to an error to which an error
code is assigned and which is logged in a dedicated memory
space (see “Event logging” section for more details).
Five configuring actions are foreseen upon generation of an
alarm:
1. Alarm relay de-energized;
2. Auto-cleaning (control actions are stopped during autocleaning mode; can be enabled only for the “Reference
electrode broken or dirty” error);
3. 3.6 or 22 mA fault current for the 4-20 mA output; 22 mA
fault current for the 0-20 mA output;
4. Hold mode (entered in any case for the following errors:
EEPROM corruption, serial bus error).
5. SMS sending to the selected telephone numbers in order
to advise of error occurrence.
The red LED flashes in any case upon generation of an
alarm, i.e. it can not be disabled by changing the error configuration.
Here is a table with errors, error codes and default error handling configuration:
(*): When the Digital Transmitter is used, these errors are
generated in the Digital Transmitter, but they are handled as
if they were generated in the Process Controller.
• If the condition to generate a “Reference electrode broken
or dirty” error is met, the error is not generated immediately, but first auto-cleaning is performed up to 2 times (the
cleaning type depends upon relays configuration).
If the Reference electrode is not OK after two auto-cleanings,
the “Reference electrode broken or dirty” error is generated.
Note
Note
The second auto-cleaning cycle is done only when the first
one is not enough.
Both the cleaning modes (simple and advanced cleaning),
when enabled through the relay mode items, are triggered
upon the “Reference electrode broken or dirty” error.
• The “pH electrode broken or leakage” and the “Reference
electrode broken or dirty” errors are never generated if the
correspondent tests are not enabled through setup items I.13
and I.14. The Reference electrode test can not be made if the
Potential matching pin is not in use (see setup item I.04).
• The 3.6 mA fault current is always off unless the 4-20 mA
output has been configured; the 22 mA fault current is
always off unless the 0-20 mA or 4-20 mA output has
been configured.
The 3.6 mA and the 22 mA fault current cannot be both set
to ON. If two errors are active when output is configured
as 4-20 mA (#1 or #2), and one of them is configured for
the 22 mA fault current, while the other one is configured
for the 3.6 mA fault current, the 22 mA current is let out to
the analog output.
The fault current is automatically disabled when the analog output is used for controlling (item O.10 equal to “SEt”),
no matter whether the fault current itself has been configured “On” or “OFF”.
• In case of a “Temperature probe broken” error, the fault current, if configured, is let out to both analog outputs (unless
O.20 is equal to “SEt”). In all the other cases only the first
analog output (for pH and ORP) can let out the fault current.
• The “Cellular error” is never activated if the serial lines are
not configured for cellular module connection. The error
will be active if the instrument is not able to communicate
101
with the cellular engine (for example because the serial
cable is broken or because the cellular engine is not powered), if the number of available SMS is finished (menu
item P.04) or if the SIM expiration date is overrun.
• The “Power reset” and the “Watchdog reset” errors are active
only for the short time of the start-up session (selftests, process name and version displaying). That start-up session ends
when the first measurement is acquired and displayed.
• When the Hold mode is enabled for the “Life check error”,
this error can be closed automatically if the measurement
vary enough.
Note
Note
102
The alarm relay (when configured to be activated) is deenergized (fail-safe ON) continuously or with a pulse of about
5 seconds. This parameter can be configured through setup
item E.99 (“LE” stands for level and “PULS” for pulse). If
pulse is configured, a new pulse will be let out upon every
new error, no matter whether the red LED is already blinking
(i.e. some error is active) or not. When the pulse finish, the
relay is energized but the error remains still active (red LED
blinking) until the error is closed.
The “Digital Transmitter error” is generated by one of the
following causes:
1. Digital Transmitter is off;
2. connection problems between the Process Controller and
the Digital Transmitter;
3. EEPROM data corruption in the Digital Transmitter;
4. Digital Transmitter not calibrated;
5. the Process Controller is configured to pH while the Digital Transmitter is configured to ORP, or vice versa;
6. other failures in the Digital Transmitter excluding: life check
error, pH electrode broken or leakage, Reference electrode
broken or dirty, old pH probe, dead pH probe, temperature
probe broken error. These errors are handled separately and
exactly in the same way as if they were generated in the Process Controller.
To understand which cause generated the “Digital Transmitter error”, the Digital Transmitter must be examined through
its calibrator.
pH VALUES AT VARIOUS TEMPERATURES
Temperature has a significant effect on pH. The calibration
buffer solutions are effected by temperature changes to a lesser
degree than normal solutions.
For manual temperature calibration please refer to the following chart:
TEMP
°C
°F
32
0
41
5
10 50
15 59
20 68
25 77
30 86
35 95
40 104
45 113
50 122
55 131
60 140
65 149
70 158
4.01
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09
4.11
4.12
6.86
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83
6.84
6.84
6.85
6.85
pH VALUES
7.01 9.18
9.46
7.13
9.39
7.10
9.33
7.07
9.27
7.04
9.22
7.03
9.18
7.01
9.14
7.00
9.10
6.99
9.07
6.98
9.04
6.98
9.01
6.98
8.99
6.98
8.97
6.98
8.95
6.99
8.93
6.99
10.01
10.32
10.24
10.18
10.12
10.06
10.01
9.96
9.92
9.88
9.85
9.82
9.79
9.77
9.76
9.75
For instance, if the buffer temperature is 25°C, the display
should show pH 4.01, 7.01 or 10.01 at pH 4, 7 or 10
buffers, respectively.
At 20°C, the display should show pH 4.00, 7.03 or 10.06.
The meter reading at 50°C will then be 4.06, 6.98 or 9.82.
103
ELECTRODE CONDITIONING AND MAINTENANCE
PREPARATION
Remove the electrode protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE
PRESENT.
This is normal with electrodes and they will disappear when
rinsed with water.
During transport tiny bubbles of air may have formed inside
the glass bulb. The electrode cannot function properly under
these conditions. These bubbles can be removed by "shaking
down" the electrode as you would do with a glass thermometer.
If the bulb and/or junction are dry, soak the electrode in
HI 70300 Storage Solution for at least one hour.
If the electrode does not respond to pH changes, the battery
may be run down and should be replaced.
TEST MEASUREMENT
Rinse the electrode tip with distilled water.
Immerse the tip (bottom 4 cm / 1½") in the sample and stir
gently for approx. 30 seconds.
For a faster response and to avoid cross contamination of
the samples, rinse the electrode tip with the solution to be
tested, before taking your measurements.
STORAGE
To minimize clogging and assure a quick response time, the
glass bulb and the junction should be kept moist and not
allowed to dry out. This can be achieved by installing the
electrode in such a way that it is constantly in a well filled with
the sample (stream or tank).
When not in use, replace the solution in the protective cap
with a few drops of HI 70300 Storage Solution or, in its
absence, HI 7082 KCl 3.5M Solution.
Follow the Preparation Procedure above before taking measurements.
Note
104
NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for the
connection to the controller must be intact and there must be
no points of broken insulation on the cable or cracks on the
electrode stem or bulb.
Connectors must be perfectly clean and dry. If any scratches
or cracks are present, replace the electrode. Rinse off any salt
deposits with water.
CLEANING PROCEDURE
General
IMPORTANT
Soak in Hanna HI 7061 General Cleaning
Solution for approximately ½ hour.
Removal of films, dirt or deposits on the membrane/junction:
Protein
Soak in Hanna HI 7073 Protein Cleaning Solution for 15 minutes.
Inorganic
Soak in Hanna HI 7074 Inorganic Cleaning
Solution for 15 minutes.
Oil/grease Rinse with Hanna HI 7077 Oil and Fat Cleaning Solution.
After performing any of the cleaning procedures rinse the
electrode thoroughly with distilled water and soak the electrode in HI 70300 Storage Solution for at least 1 hour before
reinstalling it.
TROUBLESHOOTING
Evaluate your electrode performance based on the following.
• Noise (Readings fluctuate up and down) could be due to
clogged or dirty junction: refer to the Cleaning Procedure
above.
• Dry Membrane/Junction: soak in Storage Solution
HI 70300 for at least 1 hour. Check to make sure the
installation is such as to create a well for the electrode bulb
to constantly remain moist.
• Drifting: soak the electrode tip in warm Hanna Solution HI
7082 for one hour and rinse tip with distilled water.
• Low Slope: refer to the cleaning procedure above.
• No Slope:
- Check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found).
105
- Make sure cable and connections are not damaged nor
lying in a pool of water or solution.
• Slow Response/Excessive Drift: soak the tip in Hanna Solution HI 7061 for 30 minutes, rinse thoroughly in distilled
water and then follow the Cleaning Procedure above.
• For ORP Electrodes: polish the metal tip with a lightly abrasive paper (paying attention not to scratch the surface)
and wash thoroughly with water.
Note
106
With industrial applications, it is always recommended to
keep at least one spare electrode handy. When anomalies
are not resolved with a simple maintenance, change the electrode (and recalibrate the controller) to see if the problem is
alleviated.
DEFINITIONS
DEVIATION
Same as proportional band, but expressed in units of the
controlled magnitude (eg. 1pH, 50 mV).
EEPROM
Electrically Erasable Programmable Read-only Memory (permanent memory).
FAIL SAFE ALARM
Signaling of the alarm by de-energizing the alarm relay instead of energizing it. That protects against power failures
and interruptions of the alarm relay external wires.
GLP
Good Laboratory Practice.
HYSTERESIS
Interval that must be passed over by the controlled magnitude in the opposite direction after having activated a relay,
before deactivating it, in order to avoid uninterrupted activation/deactivation of the relay.
IN-LINE CLEANING
Automatic procedure to stop control, clean the electrode and
then activate control again.
NIST
National Institute of Standards and Technology.
PID
Proportional Integrative Derivative control.
POTENTIAL MATCHING PIN Pin for connection of the potential matching (or grounding)
steel bar, which must be immersed into the measured fluid,
and is used together with a differential input to avoid damage of the reference electrode due to ground loop current.
PROPORTIONAL BAND Interval, measured in percentage of the input range, where
the proportional action spans from 0 to 100 %.
PWM
Pulse Width Modulation.
RAM
Random Access Memory (non-permanent memory).
RTC
Real Time Clock.
SETPOINT
Value at which the measurement needs to be controlled.
SOLUTION COMPENSATION
Technique for compensating the differences on the
pH of the solution under measurement when its temperature
varies.
THRESHOLD
Value above/below which a control or alarm relay is activated or deactivated.
TRIGGER
An event or command that acts like a mechanical trigger in
initiating a process.
WATCHDOG
Mechanism for issuing a reset of the device in case it gets
stuck.
107
ACCESSORIES
pH CALIBRATION SOLUTIONS
HI 7004M or HI 7004L
HI 7006M or HI 7006L
HI 7007M or HI 7007L
HI 7009M or HI 7009L
HI 7010M or HI 7010L
pH 4.01 Buffer Solution, 230 or 500 mL bottle
pH 6.86 Buffer Solution, 230 or 500 mL bottle
pH 7.01 Buffer Solution, 230 or 500 mL bottle
pH 9.18 Buffer Solution, 230 or 500 mL bottle
pH 10.01 Buffer Solution, 230 or 500 mL bottle
ORP SOLUTIONS
HI 7020M or HI 7020L
HI 7091M or HI 7091L
HI 7092M or HI 7092L
200-275mV Buffer Solution, 230 or 500 mL bottle
Pretreatment Reducing Solution, 230 or 460 mL bottle
Pretreatment Oxidizing Solution, 230 or 460 mL bottle
ELECTRODE STORAGE SOLUTIONS
HI 70300M or HI 70300L Storage Solution, 230 or 460 mL bottle
HI 7082
3.5M KCl Electrolyte, 4x50 mL
ELECTRODE CLEANING SOLUTIONS
HI 7061M or HI 7061L
HI 7073M or HI 7073L
HI 7074M or HI 7074L
HI 7077M or HI 7077L
General Cleaning Solution, 230 or 460 mL bottle
Protein Cleaning Solution, 230 or 460 mL bottle
Inorganic Cleaning Solution, 230 or 460 mL bottle
Oil & Fat Cleaning Solution, 230 or 460 mL bottle
OTHER ACCESSORIES
HI 504900
HI 504910
Hanna GSM Module
Digital Transmitter
BL PUMPS
Dosing Pumps with Flow Rate from 1.5 to 20 LPH
ChecktempC
ChecktempF
Stick Thermometer (range -50 to 150°C)
Stick Thermometer (range -58 to 302°F)
HI 5001/5
Stainless steel Pt100 probe with standard 1/2’’ external threads
on both ends for in-line and immersion installation; 5 m
(16.5’) cable
Glass Pt100 probe with external PG13.5 thread and 5 m
(16.5’) cable
HI 5002/5
108
HI 5011/5
HI 5012/5
Stainless steel Pt1000 probe with standard 1/2’’ external
threads on both ends for in-line and immersion installation;
5 m (16.5’) cable
Glass Pt1000 probe with external PG13.5 thread and 5 m
(16.5’) cable
HI 60542-0
HI 60545-0
HI 60501-0
HI 605011
1 set of O-rings for HI 60542 electrode holder
1 set of O-rings for HI 60545 electrode holder
1 set of O-rings for HI 60501 electrode holder
PVC mounting flange for HI 60501 electrode holder
HI 8427
HI 931001
HI 931002
HI 8614
HI 8614L
HI 8615
HI 8615L
pH / ORP Electrode Simulator
pH / ORP Electrode Simulator with LCD Display
4-20 mA Simulator
pH Transmitter
pH Transmitter with LCD
ORP Transmitter
ORP Transmitter with LCD
HI 92500
Windows® Compatible Application Software
109
pH AND ORP ELECTRODE HOLDERS
HI 60542
In-line electrode holder for direct pipe installation
HI 60545
Bypass loop electrode holder
110
HI 60501
Specifications
Immersion electrode holder for tanks, vessels, baths and open
channels
HI 60542
HI 60545
Electrode Holder Material
PVC
PVC
PVC
O-Ring Material
NBR
NBR
NBR
Min. & Max. Temperature
HI 60501
-10°C (14°F) & 60°C (144°F)
Min. Immersion Length
Max. Immersion Length
---
---
10 cm (3.9’’)
69 cm (27.1’’)
Max. Pressure
8 BAR (116 PSI) @25°C
--or 3 BAR (43.5 PSI) @50°C
111
pH AND ORP ELECTRODES
Hanna Instruments produces a wide range of pH and ORP electrodes specifically designed for needs of industrial uses. For a complete list of available electrodes visit our
web site at www.hannainst.com or contact your dealer.
The below table lists all the Combination, Flat tip, PVDF-body, polymer filled electrodes
with Matching Pin, operating pressure: up to 6 bar (87 psi)
(*) Available with GP sensor type only
(**) Fluoride-resistant glass sensor (F-<2g/L, temperature<60°C, pH>2)
(***) Not for ORP electrodes
112
CE DECLARATION OF CONFORMITY
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the
environment in which they are used.
Operation of these instruments in residential areas could cause unacceptable
interferences to radio and TV equipment.
To maintain the EMC performance of equipment, the recommended cables
noted in the user's manual must be used.
Any variation introduced by the user to the supplied equipment may degrade the
instruments' EMC performance.
To avoid electrical shock, do not use these instruments when voltage at the
measurement surface exceed 24VAC or 60VDC.
To avoid damage or burns, do not perform any measurement in microwave ovens.
Unplug the instruments from power supply before the replacement of the fuse.
External cables to be connected to the rear panel should be terminated with cable
lugs.
113
USER NOTES
114
115
MAN504R2
06/03
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