EUTECH INSTRUMENTS ?lpha-pH500 Specifications

Alpha DO 500
Transmitter
Dissolved Oxygen
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Preface
This manual serves to explain the use of the Alpha DO 500 transmitter. It functions in
two ways, firstly as a step by step guide to help you to operate the transmitter.
Secondly, it serves as a handy reference guide. It is written to cover as many
anticipated applications of the transmitter as possible. If there are doubts in the use
of the transmitter, please do not hesitate to contact the nearest Authorized
Distributor.
Thermo Scientific will not accept any responsibility for damage or malfunction to the
transmitter caused by improper use of the instrument.
Remember to fill in the guarantee card and mail it back to your authorized distributor.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on the part of
Thermo Scientific.
Copyright ”2009 All rights reserved.
Table of Contents
1. Introduction ...........................................................................................................1
1.1
1.2
1.3
1.4
Before You Begin ................................................................................................................... 1
Intended Use .......................................................................................................................... 1
Safety Instructions.................................................................................................................. 2
Taking Out of Service / Correct Disposal of the Unit ............................................................. 2
2. Getting Started ......................................................................................................3
2.1 Description of Instrument ....................................................................................................... 3
Power Supply Requirements (SL2 Position) ................................................................................... 3
2.2 Measurement and Control System......................................................................................... 4
2.3 Connecting Peripherals.......................................................................................................... 5
2.3.1 Connection Terminals.................................................................................................... 5
2.3.2 Connecting Dissolved Oxygen Electrode ...................................................................... 6
2.3.3 Connecting Temperature Probe .................................................................................... 6
2.4 Installation .............................................................................................................................. 7
2.4.1 Mechanical Dimensions................................................................................................. 7
2.4.2 Wall Mount..................................................................................................................... 7
2.4.3 Panel Mount................................................................................................................... 8
2.5 Display & Keypad ................................................................................................................... 9
2.5.1 Display Overview........................................................................................................... 9
2.5.2 Key Functions .............................................................................................................. 10
3. Normal Operation ................................................................................................11
3.1
3.2
Measurement mode ............................................................................................................. 11
Menu Overview .................................................................................................................... 12
4. Calibration Mode .................................................................................................13
4.1
4.2
4.3
Entering Calibration Mode.................................................................................................... 13
Calibration in mg/l or ppm of Oxygen................................................................................... 14
4.2.1 1-Point Calibration ....................................................................................................... 14
4.2.2 2-Point Calibration ....................................................................................................... 15
Calibration in% Saturation of Oxygen .................................................................................. 17
4.3.1 1-Point Calibration ....................................................................................................... 17
4.3.2 2-Point Calibration: ...................................................................................................... 18
5. Setup Mode ..........................................................................................................20
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
Enter Setup mode ................................................................................................................ 20
Configuration Settings .......................................................................................................... 21
Offset Settings...................................................................................................................... 23
Temperature Settings........................................................................................................... 25
Range Settings..................................................................................................................... 27
Hold Settings ........................................................................................................................ 28
Out of Range Settings .......................................................................................................... 29
Viewing Calibration Point ..................................................................................................... 30
Viewing Electrode Condition ................................................................................................ 31
Resetting .............................................................................................................................. 32
6. Technical Specifications.....................................................................................33
7. List of Accessories .............................................................................................35
7.1
7.2
Thermo Scientific.................................................................................................................. 35
Eutech Instruments .............................................................................................................. 36
8. Troubleshooting ..................................................................................................37
9. General Information ............................................................................................38
9.1
9.2
9.3
9.4
Warranty............................................................................................................................... 38
Return of Goods ................................................................................................................... 38
Guidelines for Returning Unit for Repair .............................................................................. 38
Maintenance and Cleaning .................................................................................................. 38
10. Appendices .......................................................................................................39
10.1 Appendix 1 – Salinity vs. Temperature (@ 760mmHg)........................................................ 39
10.2 Appendix 2 – Abbreviations Used in LCD ............................................................................ 40
Instruction Manual
Alpha DO 500
1. Introduction
1.1 Before You Begin
We thank you for purchasing the Alpha DO 500 Transmitter.
The construction of the Alpha DO 500 Transmitter employs leading edge
technology and complies with safety regulations currently in force.
Notwithstanding this, improper use could lead to hazards for the user or a
third-party, and/or adverse effects on the plant or other equipment. Therefore,
the operating instructions must be read and understood by the persons
involved before work is started with the Alpha DO 500 Transmitter.
The instruction manual must always be stored close at hand, in a place
accessible to all people working with the Alpha DO 500 Transmitter.
If you have questions, which are not or insufficiently answered in this
instruction manual, please contact your authorized supplier. They will be glad
to assist you.
1.2 Intended Use
Alpha DO 500 Transmitters are intended solely for dissolved oxygen (DO)
and temperature measurement, as described in this instruction manual.
Any other use, or use not mentioned here, that is incompatible with the
technical specifications is deemed inappropriate. The operator is solely
responsible for any damage arising from such use.
Other prerequisites for appropriate use include:
– Comply with the instructions, notes and requirements set out in this
instruction manual.
– Comply with all local safety regulations concerning safety at work.
– Comply with all information and warnings in the documentation dealing
with the products used together with the Alpha DO 500 Transmitter
(housings, sensors, etc.).
– Comply with local environmental and operational conditions.
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Instruction Manual
Alpha DO 500
1.3 Safety Instructions
- The Alpha DO 500 Transmitter should be installed and operated
only by personnel familiar with the instrument and who are
qualified for such work.
- A defective Transmitter must neither be installed nor put into
service.
- The Alpha DO 500 Transmitter must only be operated under the
specified operating conditions (see section 5.9).
- The Alpha DO 500 Transmitter must not be repaired by the
customer.
- No modifications to the Alpha DO 500 Transmitter are allowed. The
manufacturer/supplier accepts no responsibility for damage
caused by unauthorized modifications. The risk is borne entirely
by the user.
1.4 Taking Out of Service / Correct Disposal of the Unit
Taking out of Service
x First disconnect the unit from the power supply and then undo all electrical
connections.
x Remove the unit from the wall / panel.
Correct Disposal of the Instrument
When the DO Transmitter is permanently taken out of service, obey the local
environmental regulations for correct disposal or send the instrument to your
local distributor, they will take care of proper disposal.
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Instruction Manual
Alpha DO 500
2. Getting Started
2.1 Description of Instrument
The Thermo Scientific Alpha DO 500 Transmitter is used for measuring
dissolved oxygen and temperature values. The dissolved oxygen values can
be measured using industrial dissolved oxygen sensors. The temperature
values can be measured using 2-wire or 3-wire Pt100 sensors. The DO
Transmitter can be used for applications such as water treatment and
monitoring, galvanic-decontamination, chemical processing, food processing,
clean or wastewater control and neutralization processes.
The Alpha DO 500 Transmitter has many user-friendly and safety features
which include:
x
Push-button keypad for calibration and setup
x
Built-in non-volatile memory to ensure that calibration and other
information are not erased if power supply fails
x
Menu-driven program that simplifies setup
x
Automatic temperature compensation (ATC)
x
Manual temperature compensation setting without the ATC probe, with
independent setting for calibration and process temperature
x
Large dual display LCD for easy reading with clear multiple
annunciators, operational mode indicators and error indicators.
x
Galvanically isolated current output of 4 to 20mA
x
Hold function to freeze output current (22mA)
x
Out of range current indication (3.8mA)
x
Protection against electromagnetic interference
Power Supply Requirements (SL2 Position)
This transmitter requires a 12 to 24V DC power supply. Other Transmitters
and/or a chart recorder may be connected in series.
1. Insert positive loop wire from power supply to pin 1, tighten screw.
2. Insert negative loop wire to pin 2, tighten screw. This wire may be linked to a
chart recorder or to negative terminal of power supply.
1
Power Supply
Alpha pH500
2
Chart recorder
3
Instruction Manual
Alpha DO 500
2.2 Measurement and Control System
A typical measurement system consists of:
x
A Alpha DO 500 Transmitter
x
A dissolved oxygen sensor with integrated or separate Pt100
temperature sensor
x
An appropriate measurement cable
x
An immersion, flow or process assembly
x
A chart recorder
Alpha DO500 Transmitter
Chart Recorder
Alpha DO500
ESC
CAL
ENT
2-wire Dissolved Oxygen Transmitter
4 - 20 mA
Housing and
Sensors
Measurement Cable
4
Power Adaptor
(12 to 24 V DC)
Instruction Manual
Alpha DO 500
2.3 Connecting Peripherals
2.3.1 Connection Terminals
Remove Back Cover:
Remove the screws from the four corners at the back of the DO Transmitter.
Remove the back cover. The connectors are exposed on the back PCBA as
shown in the Figure 1 below.
Connectors:
x
SL2 – 12 to 24 V DC power
x
SL1 – Dissolved Oxygen electrode & Temperature probe connections
(wiring has to be done in the detachable connector
SL2
SL1
Figure 1: Outer Side of Back PCBA
SL1 Connections
SL 2 Connections
1. DC Power Supply +ve
terminal
2. DC Power Supply –ve
terminal
3. No Connection
1. DO Input, +ve terminal
2. DO Input, -ve terminal
3. No Connection
4. No Connection
5. PT100 Compensate
(Short to pin 6 for 2-wire
RTD)
6. PT100 Sense
7. PT100 Ground
8. No Connection
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Instruction Manual
Alpha DO 500
2.3.2 Connecting Dissolved Oxygen Electrode
Refer the instruction sheet that comes with your Dissolve Oxygen electrode
to identify polarity (+ve and –ve) of DO wires.
1. Connect DO +ve wire to Pin 1 of SL1 connector
2. Connect DO -ve wire to Pin 2 of SL1 connector
2.3.3 Connecting Temperature Probe
For Automatic Temperature Compensated (ATC) readings, a 100: Pt RTD
temperature probe (2-wire or 3-wire) can be connected to the Transmitter.
3-Wire Probe:
1. Connect PT100 compensate wire to Pin 5 of SL1 connector
2. Connect PT100 sense wire to Pin 6 of SL1 connector
3. Connect PT100 GND wire to Pin 7 of SL1 connector
2-Wire Probe:
1. Short Pin 5 & 6 of SL1 connector using a small piece of wire.
2. Connect PT100 sense wire to Pin 6 of SL1 connector
3. Connect PT100 GND wire to Pin 7 of SL1 connector
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Instruction Manual
Alpha DO 500
2.4 Installation
2.4.1 Mechanical Dimensions
Alpha DO 500
ESC
CAL
ENT
2-wire Dissolved Oxygen Transmitter
2.4.2 Wall Mount
1
2
Pierce through holes at
both sides
Cover the catch slots at
both sides with overlays
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Instruction Manual
Alpha DO 500
2.4.3 Panel Mount
1 Prepare panel cut-out of
92.0 mm X 92.0 mm
2 Remove back cover of
DO Transmitter and slide it
through panel cut-out
Gasket
Panel
Panel
4 Insert threaded rods through catch
until DO Transmitter is held against panel
3 Attach catch to both sides
of DO Transmitter
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Instruction Manual
Alpha DO 500
2.5 Display & Keypad
2.5.1 Display Overview
The Liquid Crystal Display (LCD) of the Alpha DO 500 Transmitter has two
alpha-numerical displays (Upper and a Lower).
x
Upper display: Measured dissolved oxygen reading (in % saturation or
ppm or mg/l) is displayed when the Transmitter is in normal operation
(measurement) mode.
x
Lower display: Measured temperature value is displayed when the
Transmitter is in normal operation (measurement) mode. In Calibration
mode, calibration points are displayed here.
The two displays indicate function names, options & settings in Setup mode.
Refer ‘Appendix 2 – Abbreviations Used in LCD’ for more details.
The LCD also consists of various mode indicators, status annunciators and
unit of measurement indicators.
Upper Display
SETUP MEAS CAL
-
%
READY
HOLD
ppm
mg/l
K=
-
°C
ERR
ATC
Lower Display
Mode Indicators
MEAS
Measurement mode (Refer Section 3.1)
SETUP
Setup mode (Refer Section 5)
CAL
Calibration mode (Refer Section 4)
Status Annunciators
READY
Appears when the reading is stable
HOLD
Appears in Setup mode and Calibration mode to indicate that the relay function
is frozen
ATC
Appears when Automatic Temperature Compensation (ATC) is enabled.
Not visible when Manual Temperature Compensation (MTC) is enabled.
Flashes if the temperature probe is faulty in its ATC mode. (Refer Section 5.4)
ERR
Appears when an error occurs
Buffer annunciator. Appears in calibration mode or viewing calibrated point
Electrode annunciator. Appears when viewing electrode properties or during
calibration error
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Instruction Manual
Alpha DO 500
Units of Measurement Indicators
%
Dissolved Oxygen in Percentage Saturation
ppm
Dissolved Oxygen in Parts Per Million
mg/l
Dissolved Oxygen in milligram per liter
ºC
Temperature in Celsius (Refer Section5.4)
2.5.2 Key Functions
lpha DO500
ESC
CAL
ENT
2-wire Dissolved Oxygen Transmitter
Key
CAL
Description
Enter Calibration mode
Enter Setup mode.
ENT
Access sub screens (parameters) within a group of settings in Setup
mode.
Confirm (save) setup parameters and numerical values
Start/Confirm calibration in Calibration mode.
Select a group of settings in Setup mode.
Select parameters and increment/decrement numerical values in Setup
and Calibration modes.
(When pressed continuously, speed of values increment/decrement
increases)
Returns to Measurement mode when both keys are pressed
simultaneously.
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Instruction Manual
Alpha DO 500
3. Normal Operation
3.1 Measurement mode
When the DO Transmitter is powered on, the display shows all the LCD
segments briefly, and then automatically enters into the Measurement mode.
MEAS
READY
99.0
25.0
%
°C
ATC
The mode indicator ‘MEAS’ at the top of the display indicates that the
Transmitter is in Measurement mode. The upper alpha-numerical display
shows the measured dissolved oxygen value, while the lower display shows
the temperature value. The indicator “%”, “ppm” or “mg/l” at the upper right
side of the display indicates the current measurement mode. (Refer section
5.2 for switching measurement modes)
NOTE:
To guarantee accurate readings, the measuring system (the DO
Transmitter and the sensor) must be calibrated regularly.
From measurement mode you can access:
x
Calibration mode (by pressing CAL key)
x
Setup mode (by pressing ENT key)
For more details, refer section 4 for Calibration mode and section 5 for Setup
mode.)
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Instruction Manual
Alpha DO 500
3.2 Menu Overview
CAL
CAL
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
HOLD
MEAS
%
READY
°C
ATC
SETUP
HOLD
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
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Instruction Manual
Alpha DO 500
4. Calibration Mode
4.1 Entering Calibration Mode
While in measurement mode, press CAL key to access calibration mode.
LCD indicates ‘CAL dO’.
MEAS
CAL
%
READY
CAL
ENT
HOLD
°C
ATC
To quit Calibration Mode
Calibration Mode
Calibration in mg/l or ppm - See Section 4.3
Calibration in % saturation - See Section 4.4
&
NOTES:
x
To exit calibration mode at any time during calibration, press and keys simultaneously (escape). The DO Transmitter returns to the
measurement mode and the old calibration values remain active.
x
The calibration is always carried out in the units of measurement (mg/l
or ppm or %) selected in setup mode.
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Instruction Manual
Alpha DO 500
4.2 Calibration in mg/l or ppm of Oxygen
The DO Transmitter is capable of calibration of up to 2 points for dissolved
oxygen. All new calibration values will automatically override existing
calibration data. Make sure the unit of measurement is set to mg/l or ppm.
(Refer Section 5.2 for switching unit of measurements).
If you wish to abort the DO calibration, press and keys simultaneously
and the DO Transmitter reverts to measurement mode.
4.2.1 1-Point Calibration
The 1-point calibration is done at high-point using 8.24 mg/l of dissolved
oxygen solution.
CAL
1
CAL
HOLD
3
2
ENT
CAL
ENT
HOLD
HOLD
4
MEAS
ENT
READY
READY
mg/l
mg/l
°C
ATC
Measured value should be
within +/- 50 % of high-point
CAL
+
22
CAL
HOLD
HOLD
mg/l
ERR
Calibration error occurs if measured value
is not within +/- 50% of high-point
during 1-point calibration
1
From measurement mode press CAL key to enter calibration mode as
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin calibration.
2
Select 1-point calibration: The display shows ‘1Pt CAL’. If ‘2Pt CAL’ is
shown, press or key to select ‘1Pt CAL’.
Press ENT key to confirm the selection.
3
The buffer annunciator
appears in LCD. The lower display shows ‘HI’,
indicating the high-point is being calibrated. Immerse the electrode in
8.24 mg/l dissolved oxygen solution. Immerse the temperature probe in
the solution if ATC is enabled. The upper display shows the measured
value of dissolved oxygen of the solution. Allow the reading to stabilize.
LCD shows ‘READY’ annunciator when the reading is stable.
Press or key to adjust the reading to 8.24 mg/l. The Transmitter
allows adjusting up to r50% of the measured value.
Press ENT key to confirm the reading.
NOTE: The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is more than
r50% of the high-point value.
4
The calibration is completed. The DO Transmitter reverts to
measurement mode.
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Instruction Manual
Alpha DO 500
NOTES:
x
If the displayed value is more than r10% of the high-point value, the
Transmitter indicates a calibration error by showing ‘ERR’ and blinking
electrode annunciator. If this happens, press and keys together
to return to measurement mode. Restart the calibration from Step1.
x
x
To exit from calibration mode without confirming calibration, press and keys together.
When calibrating with manual temperature compensation, the
Transmitter automatically changes from preset ‘process temperature’ to
‘calibration temperature’. After leaving calibration mode, the transmitter
switches back to the ‘process temperature’. (Refer section 5.4 for
temperature settings)
4.2.2 2-Point Calibration
The 2-point calibration is carried out at Low-point (zero dissolved oxygen
solution) and then at high-point using 8.24 mg/l of dissolved oxygen solution.
CAL
1
CAL
2
CAL
ENT
HOLD
4
HOLD
HOLD
5
MEAS
ENT
READY
READY
mg/l
mg/l
°C
ATC
+
ENT
CAL
22
3
CAL
ENT
HOLD
ENT
READY
HOLD
CAL
mg/l
HOLD
mg/l
ERR
Measured value should be
<10 % of high-point
Calibration error occurs
if measured value is
<10% of high-point
during 1st point calibration
or
if measured value is not
within +/-50% of high-point
during 2nd point calibration
1
From measurement mode press CAL key to enter calibration mode as
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin first calibration point.
2
Select 2-point calibration: The display shows ‘1Pt CAL’. Press or key to select ‘2Pt CAL’.
Press ENT key to confirm the selection.
3
The buffer annunciator
appears in LCD. The lower display shows
‘LO’, indicating the low-point is being calibrated. Immerse the electrode
in a low level of dissolved oxygen solution (0.0 mg/l). Immerse the
temperature probe in the solution if ATC is enabled. The upper display
shows the measured value of dissolved oxygen of the solution. Allow the
reading to stabilize. LCD shows ‘READY’ annunciator when the reading
is stable.
Press ENT key to confirm the reading.
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Instruction Manual
Alpha DO 500
NOTE: The transmitter proceeds to the second point of calibration if the
displayed reading is less than 10% of the high-point value.
NOTE: The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is more than 10% of
the high-point value.
If the low-point calibration is successful, the Transmitter proceeds to the
second point. The lower display shows ‘HI’. Take the electrode out of low
oxygen solution and immerse it in a higher dissolved oxygen
concentration (8.24 mg/l) solution.
4
The upper display shows the measured value of dissolved oxygen of the
solution. Allow the reading to stabilize. LCD shows ‘READY’ annunciator
when the reading is stable.
Press or key to adjust the reading to 8.24 mg/l. The Transmitter
allows adjusting up to r50% of the measured value.
Press ENT key to confirm the reading.
NOTE: The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is more than
50% of the high-point value.
The calibration is completed. The DO Transmitter reverts to
measurement mode.
5
NOTES:
x
If the displayed value is more than r10% of the high-point value, the
Transmitter indicates a calibration error by showing ‘ERR’ and blinking
electrode annunciator. If this happens, press and keys together
to return to measurement mode. Restart the calibration from Step1.
x
x
To exit from calibration mode without confirming calibration, press and keys together.
When calibrating with manual temperature compensation, the
Transmitter automatically changes from preset ‘process temperature’ to
‘calibration temperature’. After leaving calibration mode, the transmitter
switches back to the ‘process temperature’. (Refer section 5.4 for
temperature settings)
16
Instruction Manual
Alpha DO 500
4.3 Calibration in% Saturation of Oxygen
The DO Transmitter is capable of calibrating up to 2 points for dissolved
oxygen. All new calibration values will automatically override existing
calibration data. Make sure the unit of measurement is set to %. (Refer
Section 5.2 for switching unit of measurements).
If you wish to abort the operation during DO calibration, press and keys
simultaneously and the DO Transmitter reverts to measurement mode.
4.3.1 1-Point Calibration
The 1-point calibration is done in air (100% oxygen saturation).
CAL
1
CAL
HOLD
3
2
ENT
CAL
ENT
HOLD
READY
4
MEAS
%
ENT
%
READY
HOLD
°C
ATC
Measured value should be
within +/- 50 % of high-point
CAL
+
22
CAL
%
HOLD
HOLD
ERR
Calibration error occurs if measured value
is not within +/- 50% of high-point
during 1-point calibration
1
From measurement mode press CAL key to enter calibration mode as
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin first calibration point.
2
Select 1-point calibration: The display shows ‘1Pt CAL’. If ‘2Pt CAL’ is
shown, press or key to select ‘1Pt CAL’.
Press ENT key to confirm the selection.
3
The buffer annunciator
appears in LCD. The lower display shows
‘100.0’. Allow the electrode to equilibrate in air. The upper display shows
the measured value of dissolved oxygen saturation. Allow the reading to
stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
Press ENT key to confirm the reading.
NOTE: The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is not within
50% to 150%.
4
The calibration is completed. The DO Transmitter reverts to
measurement mode.
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Instruction Manual
Alpha DO 500
NOTES:
x
If the displayed value is not within 50% to 150%, the Transmitter
indicates a calibration error by showing ‘ERR’ and blinking electrode
annunciator. If this happens, press and keys together to return to
measurement mode. Restart the calibration from Step1.
x
x
To exit from calibration mode without confirming calibration, press and keys together.
When calibrating with manual temperature compensation, the
Transmitter automatically changes from preset ‘process temperature’ to
‘calibration temperature’. After leaving calibration mode, the transmitter
switches back to the ‘process temperature’. (Refer section 5.4 for
temperature settings)
4.3.2 2-Point Calibration:
The 2-point calibration is carried out with standard DO buffer of 0% oxygen
saturation and then in air (100% oxygen saturation)
CAL
1
CAL
2
CAL
ENT
HOLD
4
5
MEAS
%
READY
HOLD
ENT
%
READY
HOLD
°C
ATC
+
ENT
CAL
22
3
CAL
ENT
HOLD
READY
%
HOLD
CAL
ENT
%
HOLD
ERR
Measured value should be
<10 % of high-point
Calibration error occurs
if measured value is
<10% of high-point
during 1st point calibration
or
if measured value is not
within +/-50% of high-point
during 2nd point calibration
1
From measurement mode press CAL key to enter calibration mode as
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin first calibration point.
2
Select 2-point calibration: The display shows ‘1Pt CAL’. Press or key to select ‘2Pt CAL’.
Press ENT key to confirm the selection.
3
The buffer annunciator
appears in LCD. The lower display shows
‘0.0’. Immerse the electrode in 0% standard DO buffer solution. Immerse
the temperature probe in the solution if ATC is enabled. The upper
display shows the measured value of dissolved oxygen of the solution.
Allow the reading to stabilize. LCD shows ‘READY’ annunciator when
the reading is stable.
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Instruction Manual
Alpha DO 500
Press ENT key to confirm the reading.
NOTES:
x
The transmitter proceeds to the second point of calibration
if the displayed reading is less than 10%
x
The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is more
than 10%
If the 0% calibration is successful, the Transmitter proceeds to the
second point. The lower display shows ‘100.0’. Take the electrode out of
0% oxygen solution, rinse in clean water, dry it and then allow the
electrode to equilibrate in air. The upper display shows the measured
value of dissolved oxygen saturation. Allow the reading to stabilize. LCD
shows ‘READY’ annunciator when the reading is stable.
4
Press ENT key to confirm the reading.
NOTE: The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is not with
50% to 150%
The calibration is completed. The DO Transmitter reverts to
measurement mode.
5
NOTES:
x
If the displayed value is more than r10% of the high-point value, the
Transmitter indicates a calibration error by showing ‘ERR’ and blinking
electrode annunciator. If this happens, press and keys together
to return to measurement mode. Restart the calibration from Step1
x
x
To exit from calibration mode without confirming calibration, press and keys together
When calibrating with manual temperature compensation, the
Transmitter automatically changes from preset ‘process temperature’ to
‘calibration temperature’. After leaving calibration mode, the transmitter
switches back to the ‘process temperature’ (Refer section 5.4 for
temperature settings)
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Instruction Manual
Alpha DO 500
5. Setup Mode
5.1 Enter Setup mode
The setup mode allows you to customize the settings of the DO Transmitter to suite
your requirements. While in measurement mode, press the ENT key to access setup
mode. LCD shows ‘SETUP’ mode indicator and the first page of setup (OFS – offset
settings). Press or key to access other pages of the setup mode. To exit from
setup mode any time press and keys simultaneously (escape). The
Transmitter returns to measurement mode.
MEAS
%
READY
°C
ATC
SETUP
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
HOLD
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
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Instruction Manual
Alpha DO 500
5.2 Configuration Settings
Configuration settings let you configure the DO Transmitter to different units of
measurements (%, mg/l or ppm) set salinity and pressure values.
1
4
2
SETUP
5
SETUP
SETUP
ENT
HOLD
%
SETUP
ENT
ENT
HOLD
HOLD
ENT
HOLD
ENT
4
3
2
SETUP
SETUP
HOLD
ENT
HOLD
ppm
5
SETUP
SETUP
ENT
This screen is skipped
if % is selected
4
2
5
SETUP
SETUP
SETUP
ENT
HOLD
HOLD
ENT
HOLD
HOLD
ENT
HOLD
mg/l
ENT
1
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press ENT key to access configuration setting (COF).
2
Selecting unit of measurement for DO: The display shows the ‘SEt
Unit’. The right corner of the LCD shows currently configured unit of
measurement for dissolved oxygen.
Press or key to select the desired unit of measurement (% or ppm
or mg/l). Press ENT key to confirm your selection.
If ppm or mg/l is selected for unit of measurement:
3
Setting salinity value: The lower display shows ‘SAL’. The upper
display shows currently configured salinity value. (default is 0.0 ppt)
Press or key to adjust the upper display to the required
salinity value. Allowable range is 0.0 to 50.0ppt.
Press ENT key to confirm the value.
NOTE: This screen does not appear if % was selected in step 2.
The DO transmitter moves to step 4.
4
Setting units of measurement for pressure: The upper display shows
‘PrE’. The lower display shows currently configured unit of measurement
for pressure. Press or key to select the required unit of
measurement for pressure (Hg or PSI or Bar). Press ENT key to confirm
the selection.
5
Setting pressure value: The upper display shows previously set
pressure value (if any); otherwise it shows the default value. The lower
21
Instruction Manual
Alpha DO 500
display shows the unit measurement selected in the step 4.
Press or key to set the required pressure value. Press ENT key to
confirm the value. The Transmitter reverts to COF screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.3 Offset Settings
In applications where continuous DO measurement is required, it may not be
convenient to remove the electrode for calibration. In such cases, an on-line offset
adjustment is recommended. The DO Transmitter allows you set an offset of up to ±
2.00ppm or ± 2.00 mg/l or ± 10.0% to compensate for errors in the electrode.
The DO Transmitter adds or subtracts the offset value from the measured DO value
and displays the corrected value. However, if you need to offset the value beyond the
average offset you would expect in your application type, consider a full calibration or
even electrode replacement.
1
SETUP
1
ENT
HOLD
SETUP
%
2
2 sec.
HOLD
SETUP
3
ENT
HOLD
This screen is skipped
if Offset is zero
SETUP
%
ENT
HOLD
2
SETUP
ENT
HOLD
1
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COFS). Press or key to select offset settings screen (OFS).
Press ENT key to access offset settings (OFS).
The Transmitter displays the current offset value (if any) for 2 seconds
and switches to the next screen.
2
Selecting to modify offset: The upper display shows ‘OFS’. Press or
key to select ‘YES’ or ‘nO’.
- Select YES to set an offset (or adjust the existing offset)
- Select nO to skip offset adjustment
Press ENT key to confirm your selection.
If ‘YES’ was selected:
3
Adjust the offset value: The upper display shows the currently
configured offset value (if any), otherwise zero. The lower display
shows currently measured DO reading (including the current offset
value). Allow the reading to stabilize. LCD shows ‘READY’
annunciator when the reading is stable.
Press or key to adjust the upper display to required offset.
Press ENT key to confirm the value. The Transmitter reverts to
OFS screen.
23
Instruction Manual
Alpha DO 500
If ‘nO’ was selected:
The existing offset value (if any) is unaffected and the Transmitter
reverts to OFS screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.4 Temperature Settings
Temperature settings allow you to enable or disable Automatic Temperature
Compensation (ATC) of the Transmitter.
Set the Transmitter to manual temperature compensation (disable ATC) when the
temperature of sample or process liquid is constant and a temperature probe is not
available. When you disable ATC, the Transmitter allows you to set your process
temperature (PºC) and calibration temperature (CºC). This allows calibration at a
different temperature other than the process temperature.
1
SETUP
SETUP
HOLD
HOLD
ENT
ENT
HOLD
HOLD
ENT
HOLD
°C
°C
ATC
ATC
5
2
SETUP
1
4
3
2
SETUP
SETUP
ENT
6
SETUP
SETUP
ENT
HOLD
ENT
HOLD
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select temperature settings screen (SEt
ºC).
Press ENT key to access temperature settings (SEt ºC).
2
Enable/disable ATC: The upper display shows ‘AtC’. The lower display
shows the last configured ATC selection (‘On’ or ‘OFF’).
Press or key to enable (AtC On) or disable (AtC OFF) automatic
temperature compensation.
Press ENT key to confirm your selection.
If ATC enabled (AtC On):
3
Setting temperature offset: The upper display shows the last
configured temperature offset value (if any), otherwise zero. The
lower display shows currently measured temperature reading
(including last configured offset value). LCD shows ‘ATC’
annunciator in lower-right corner.
Place a thermometer, which is known to be accurate, in your
sample or process liquid. Make sure your temperature probe is
placed in the same liquid. Compare the stabilized temperature
reading displayed on the Transmitter with the thermometer. If there
is a difference between the two readings (offset), you can adjust the
reading of the Transmitter. Press or key to adjust the lower
display to the correct temperature value.
25
Instruction Manual
4
Alpha DO 500
As the lower display value changes, the Transmitter adjusts the
upper display reading automatically to suit the new offset value. Up
to ± 10 ºCF offset is allowed.
Press ENT key to confirm the value. The Transmitter reverts to
SET ºC screen.
If ATC disabled (AtC OFF):
5
Setting process temperature: The lower display shows ‘PºC’ and
the upper display shows the last configured process temperature.
Press or key to adjust the upper display to desired process
temperature. Allowable range: 0.0 to 100.0°C.
6
Setting calibration temperature: The lower display shows ‘CºC’
and the upper display shows the last configured calibration
temperature. Press or key to adjust the upper display to
desired calibration temperature. Allowable range: 0.0 to 100.0°C.
Press ENT key to confirm the process temperature.
Press ENT key to confirm the calibration temperature. The
Transmitter reverts to SET ºC screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.5 Range Settings
The range settings allow you to map the Transmitter output current range (4-20 mA)
to dissolve oxygen reading range (Zoom window). You can define the lowest DO
reading of the Transmitter to 4mA (LO) and the highest DO reading to 20mA (HI).
The current output can then be connected to a chart recorder to plot the DO
variations.
Zoom Window
Default
Default
Lower Limit (LO)
Upper Limit (HI)
0.00
199.9
0.00
19.9
0.00
19.9
Unit of
Measurement
% saturation
ppm
mg/l
1
%
ENT
HOLD
3
2
SETUP
SETUP
SETUP
ENT
%
ENT
HOLD
HOLD
1
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select range settings screen (SEt rng).
2
Select lower limit: The lower display shows ‘LO’. The upper display
shows the last configured lower limit, otherwise the default lower limit.
Press or key to adjust the upper display to desired value.
Press ENT key to access range settings (SEt rng).
Press ENT key to confirm the value.
3
Select upper limit: The lower display shows ‘HI’. The upper display
shows the last configured upper limit, otherwise the default upper limit.
Press or key to adjust the upper display to desired value.
Press ENT key to confirm the value. The Transmitter reverts to SET rng
screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.6 Hold Settings
When you switch the Transmitter to calibration mode or setup mode, the transmitter
goes to the ‘HOLD’ status (indicating ‘HOLD’ in the display) and freezes the current
output at a specific value. Hold setting allows you to define the output current of the
Transmitter when the Transmitter is in ‘HOLD’ status.
1
2
SETUP
SETUP
ENT
ENT
HOLD
HOLD
2
SETUP
ENT
HOLD
1
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select hold settings screen (SEt HLd).
Press ENT key to access hold settings (SEt HLd).
2
The upper display shows ‘HLd’ and the lower display shows the last
configured hold setting (‘On’ or ‘OFF’). Press or key to select the
required choice for hold.
- Select On to freeze the current output at 22mA
- Select OFF to freeze the current output at its last measured value.
NOTE: The last current output value depends on the last measured DO
reading and the range settings defined in the section 5.5
Press ENT key to confirm your selection. The Transmitter reverts to SET
HLd screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.7 Out of Range Settings
When the Transmitter measures a dissolved oxygen value which does not fall within
the DO range (Zoom window) defined in the ‘Range Settings’, the reading is said to
be ‘out of range’. Out of range setting allows you to define the output current of the
Transmitter when the Transmitter measures an ‘out of range’ DO reading.
1
2
SETUP
SETUP
ENT
ENT
HOLD
HOLD
2
SETUP
ENT
HOLD
1
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select out of range settings screen (SEt
org).
Press ENT key to access out of range settings (SEt org).
2
The upper display shows ‘org’ and the lower display shows the last
configured out of range setting (‘On’ or ‘OFF’). Press or key to
select the required choice.
- Select On to set output current to 3.8mA
- Select OFF to set output current to the boundary values:
That is: To set output current to 4mA when DO reading goes
bellow lower limit of the zoom window and,
To set output current to 20mA when the DO reading goes
above the upper limit of the zoom window.
Press ENT key to confirm your selection. The Transmitter reverts to SET
org screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.8 Viewing Calibration Point
Calibration setting lets you view the high-point at which the calibration has been
performed in the Transmitter.
1
2
SETUP
SETUP
ENT
1
%
ENT
HOLD
HOLD
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select viewing calibration settings screen
(CAL).
Press ENT key to view calibration settings (CAL).
2
appears in the LCD. The upper display shows
The buffer annunciator
the value of the high-point at which the calibration has been carried out.
The corresponding unit of measurement of calibration is displayed.
NOTE: If the Transmitter has not been calibrated yet for the currently
selected unit of measurement, the LCD shows an empty
reading (“---“ ) in the upper display.
Press ENT key to exit calibration settings screen. The Transmitter
reverts to SET CAL screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
5.9 Viewing Electrode Condition
The electrode condition (correction factor=K) is an indication of its current working
condition with respect to its original condition. The correction factor is calculated and
stored in the Transmitter each time calibration is done.
Electrode Correction Factor (K) = Theoretical reading of the electrode
Default reading of the electrode
1
2
SETUP
SETUP
ENT
ENT
HOLD
HOLD
1
K=
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select viewing electrode condition screen
(ELE).
Press ENT key to view electrode condition (ELE).
2
appears in the LCD. The upper display
The electrode annunciator
shows the current correction factor of the electrode (K)
NOTE:
If the Transmitter has not been calibrated yet for the currently
selected unit of measurement, the LCD shows an empty
reading (“---“ ) in the upper display.
Press ENT key to exit the electrode condition screen. The Transmitter
reverts to ELE screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
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5.10 Resetting
Resetting restores the Transmitter to its factory default settings. It resets the
calibration to factory defaults without resetting other parameters of the Transmitter.
1
2
SETUP
SETUP
ENT
ENT
HOLD
HOLD
2
SETUP
ENT
HOLD
1
From measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(COF). Press or key to select resetting screen (rSt).
Press ENT key to access resetting (rSt).
2
The upper display shows ‘rSt’. The lower display shows ‘CAL’. Press or key to select :
CAL :
to reset calibration values to factory defaults, when confirmed
by pressing ENT key
FCt :
to reset all the parameters, including calibration, when
confirmed by pressing ENT key
NOTE: You can press and keys simultaneously (escape) to
exit resetting mode if you do not wish to reset the Transmitter at
this time.
Press ENT key to confirm the resetting selection. The Transmitter
performs reset function. LCD indicates that the reset has been performed
by blinking your selection (‘CAL’ or ‘FCt’). The Transmitter reverts to rSt
screen.
Press or key to access other setup screens or press and key
simultaneously (escape) to return to measurement mode.
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Instruction Manual
Alpha DO 500
6. Technical Specifications
General Specification
(a) Dissolved Oxygen (% saturation)
Measuring Range
Resolution
Relative Accuracy
(b) Dissolved Oxygen (ppm or mg/l)
Measuring Range
Resolution
Relative Accuracy
(c) Temperature
Measuring range
Resolution
Relative accuracy
Sensor
Calibration
(a) Dissolved Oxygen
Number of calibration points
(b) Temperature
Offset Adjustment
Compensation
Temperature Compensation
Pressure Compensation
Salinity Compensation
Output Parameters
Output Current
Over/Under Range Output
Current
HOLD Output Current
Load Resistance
Display
LCD
Electrical Data and Connections
DO Input
Connection terminal
0.00 to 199.9 %
0.1 %
± 1.5% of full-scale reading
0.00 to 19.99 ppm or 0.00 to 19.99 mg/l
0.01 ppm or 0.01 mg/l
± 1.5% of full-scale reading
0.0 to +100.0 oC
0.1 oC
± 0.5 oC
Pt100 (2 wire or 3 wire)
1 or 2 points
± 10 C
Automatic or Manual (0 to 50 oC)
0.74 to 3.00 BAR
550 mmHg to 2250 mmHg (225 cmHg)
10.7 to 43.5 PSI
(Manual setting and automatic correction)
0.0 to 50.0 ppt
(Manual setting and automatic correction)
4 to 20 mA (Galvanically Isolated)
ON Select : 3.8 mA
OFF Select: 4 mA (under range), 20 mA (over
range)
ON Select : 22 mA
OFF Select : Last measured current
600 ohms (max.) at 24V
7 segments display with symbols for status
information
Screw Terminal (3.5mm pitch)
8-pin & 3-pin terminal blocks
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Instruction Manual
Alpha DO 500
Other
Power Input
Dimensions (W x H x D)
Weight (Estimated)
Ambient Temp. operating
range
Maximum Relative Humidity
12 to 24 VDC
96mm x 96mm x 66 mm
210g
0 to 40 oC
80% up to 31 oC decreasing linearly to 50% at
40oC
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Instruction Manual
Alpha DO 500
7. List of Accessories
7.1 Thermo Scientific
Transmitter Replacement and Accessories
Item Description
Alpha DO 500 Transmitter
General Purpose Epoxy-body Dissolved Oxygen Electrode
with PT100, range: 0.50 - 20 ppm, 5m cable length, tinned
open-ended
Special Purpose Epoxy-body Low Dissolved Oxygen
Electrode with PT100, range: 0.03 -20 ppm, 5m cable length,
tinned open-ended.
Set of 5 O-rings & membranes (DOGEN-S)
Set of 5 O-rings & membranes (DOTPII-S)
Large O-ring (DO GENS/TPIIS)
Tool for DOGEN-S Membrane Housing
DO Refilling Electrolyte for EC-DOGEN-S (480ml bottle)
DO Refilling Electrolyte for EC-DOTPII-S (480ml bottle)
35
Order Code
TSDOCTP0500
ECDOGEN-S
ECDOTPII-S
01X241605
01X241606
32X246702
15X241503
ECDOGENSOLNBT
ECDOTPIISOLNBT
Instruction Manual
Alpha DO 500
7.2 Eutech Instruments
Controller Replacement and Controller Accessories
Item Description
Alpha DO 500 Transmitter
General purpose epoxy-body dissolved oxygen electrode with
Pt100 temperature sensor, 0-20 ppm, 10 foot cable length,
tinned open-ended.
DO probe maintenance kit; Includes 2 PTFE membranes, 2
membrane O-rings, 1 body seal O-ring, 125mL electrolyte
Set of 5 O-rings & PTFE membranes
Replacement electrolyte solution for 35201-50, 500 mL
Order Code
35151-10
35201-50
35201-70
35201-65
35640-71
NOTE:
x To order Eutech accessories, contact the nearest Oakton distributor
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Instruction Manual
Alpha DO 500
8. Troubleshooting
Problem
Power on, but no
display
Cause
a) Loose connections
b) Power cables not in
correct polarity (+ & -)
c) Incorrect output voltage
of the power supply
Unstable dissolved
oxygen reading
a) Air bubbles in electrode
b) Dirty electrode
Oscillating
temperature readings
a) Electrical noise
interference
Slow response
Blinking ATC
a) Dirty / Oily electrode
a) No temperature probe
connection during ATC
mode
a) Error in calibration
Blinking electrode
annunciator
Or (Dissolved
oxygen)
Or (Temperature)
a) Dissolved oxygen
electrode is not
connected
a) Temperature probe is
not connected when
ATC enabled
37
Solution
a) Ensure cables make good
contact
b) Re-wire loop cables with
correct polarity
c) Use a power supply with
specified output voltage
a) Tap electrode to remove air
bubbles
b) Clean electrode and
recalibrate
a) Ensure shield wire is
properly connected to pin 7
a) Clean electrode
a) Ensure temperature
sensing cable makes good
contact
a) Ensure calibration standard
solution is not
contaminated. Ensure
electrode is clean.
a) Ensure electrode makes
good contact with
Transmitter
a) Ensure electrode makes
good contact with
Transmitter
Instruction Manual
Alpha DO 500
9. General Information
9.1 Warranty
This transmitter is supplied with a one-year warranty against significant deviations in
material and workmanship from date of purchase and a six-month warranty for probe.
Each instrument will have a warranty card with a specific serial number. The
warranty card must be endorsed by the Authorized Distributor at the point of sale.
If repair or adjustment is necessary and has not been the result of abuse or misuse
within the designated period, please return – freight pre-paid – and correction will be
made without charge. Thermo Scientific/ Eutech will determine if the product problem
is due to deviations or customer misuse.
Out of warranty products will be repaired on a charged basis.
Exclusions
The warranty on your instrument shall not apply to defects resulting from:
x Improper or inadequate maintenance by customer
x Unauthorized modification or misuse
x Operation outside of the environment specifications of the products
9.2 Return of Goods
Authorization must be obtained from our Customer Service Department or authorized
distributor before returning items for any reason. A “Return Goods Authorization”
(RGA) form is available through our authorized distributor. Please include data
regarding the reason the items are to be returned. For your protection, items must be
carefully packed to prevent damage in shipment and insured against possible
damage or loss. Thermo Scientific will not be responsible for damage resulting from
careless or insufficient packing. A restocking charge will be made on all unauthorized
returns.
NOTE: Thermo Scientific reserves the right to make improvements in design,
construction, and appearance of products without notice
9.3 Guidelines for Returning Unit for Repair
Use the original packaging material if possible when shipping the unit for repair.
Otherwise wrap it with bubble pack and use a corrugated box for additional protection.
Include a brief description of any faults suspected for the convenience of Customer
Service Dept., if possible.
9.4 Maintenance and Cleaning
Maintenance
The lpha DO 500 Transmitter contains no user repairable components. Please
contact Eutech Instruments or its distributor if there is any problem with the unit.
Cleaning
To remove dust, dirt and spots, the external surfaces of the DO Transmitter may be
wiped with a damp, lint-free cloth. A mild household cleaner can also be used if
necessary.
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Instruction Manual
Alpha DO 500
10. Appendices
10.1 Appendix 1 – Salinity vs. Temperature (@ 760mmHg)
The following table shows the Dissolved Oxygen values at different salinity values, at
different temperatures, at barometric pressure of 760 mmHg. For other pressure
levels, the Transmitter automatically corrects the value based on the pressure value
input.
Temperature
o
C
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
o
Salinity (ppt)
F
0
10
20
30
40
32.0
33.8
35.6
37.4
39.2
41.0
42.8
44.6
46.4
48.2
50.0
51.8
53.6
55.4
57.2
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
84.2
86.0
87.8
89.6
91.4
93.2
95.0
96.8
98.6
100.4
102.2
104.0
14.6
14.2
13.8
13.4
13.1
12.7
12.8
12.1
11.8
11.5
11.3
11.0
10.7
10.5
10.3
10.1
9.8
9.6
9.4
9.2
9.1
8.9
8.7
8.6
8.4
8.2
8.1
8.0
7.8
7.7
7.6
7.4
7.3
7.2
7.1
7.0
6.8
6.7
6.6
6.5
6.4
13.8
13.4
13.1
12.7
12.4
12.1
11.8
11.5
11.2
11.0
10.7
10.5
10.3
10.1
9.9
9.7
9.5
9.3
9.1
8.8
8.7
8.6
8.4
8.3
8.1
8.0
7.8
7.7
7.6
7.4
7.3
7.1
7.0
6.9
6.8
6.7
6.5
6.4
6.3
6.3
6.3
13.0
12.6
12.3
12.0
11.7
11.4
11.1
10.9
10.6
10.4
10.1
9.9
9.7
9.5
9.3
9.1
9.0
8.8
8.6
8.5
8.3
8.1
8.0
7.9
7.7
7.6
7.4
7.3
7.1
7.0
6.9
6.7
6.6
6.5
6.5
6.4
6.2
6.1
6.0
5.9
5.8
12.1
11.8
11.5
11.2
11.0
10.7
10.5
10.2
10.0
9.8
9.6
9.4
9.2
9.0
8.8
8.6
8.5
8.3
8.2
8.0
7.8
7.7
7.6
7.4
7.3
7.2
7.0
6.9
6.8
6.6
6.5
6.4
6.3
6.2
6.1
6.0
5.9
5.8
5.7
5.6
5.5
11.3
11.0
10.8
10.5
10.3
10.0
9.8
9.6
9.4
9.2
9.0
8.8
8.6
8.5
8.3
8.1
8.0
7.8
7.7
7.6
7.4
7.3
7.1
7.0
6.9
6.7
6.6
6.5
6.4
6.3
6.1
6.0
5.9
5.8
5.7
5.6
5.5
5.4
5.3
5.2
5.2
39
Instruction Manual
Alpha DO 500
10.2 Appendix 2 – Abbreviations Used in LCD
Abbreviation
AtC
Description
Automatic Temperature Compensation
bAr
Pressure in Bar
bUFF
Buffer
CAL
Calibration
CHg
Pressure in centimeter of mercury
CºC
Calibration Temperature
ELE
Electrode condition
FCt
Factory defaults
Hg
Pressure in millimeter of mercury
HI
High limit
HLd
Hold
LO
Low limit
OFS
Offset
Or
Reading is over range
Org
Out of range
PºC
Process Temperature
PrE
Pressure
PSI
Pressure in pounds per square inch
rng
Range
rSt
Reset
Set
Setting
Unt
Unit
Ur
Reading is under range
1.Pt
1-point calibration
2.Pt
2-point calibration
40
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