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Instruction Manual
αlpha-DO500
2-Wire Dissolved Oxygen Transmitter
Dissolved Oxygen/ºC meter
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68X216876 Rev 1 May 06
Preface
This manual serves to explain the use of the αlpha-DO 500 Transmitter. The
manual functions in two ways, firstly as a step by step guide to help the user operate
the instrument. Secondly, it serves as a handy reference guide. This instruction
manual is written to cover many anticipated applications of the αlpha-DO 500
Transmitter. If you have doubts in the use of the instrument, please do not hesitate to
contact the nearest Eutech Instruments Authorised Distributor.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on part of Eutech
Instruments.
Eutech Instruments cannot accept any responsibility for damage or malfunction of the
unit due to improper use of the instrument.
Copyright ©2006 All rights reserved.
Eutech Instruments Pte Ltd.
Table of Contents
1. Introduction ...........................................................................................................1
1.1 Before You Begin ................................................................................................................... 1
1.2 Intended Use .......................................................................................................................... 1
1.3 Safety Instructions.................................................................................................................. 2
1.4 Putting Out of Service / Correct Disposal of the Unit ............................................................. 2
2. Getting Started ......................................................................................................3
2.1 Description of Instrument .......................................................................................................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 Measurement mode ............................................................................................................. 11
3.2 Menu Overview .................................................................................................................... 12
4. Calibration Mode .................................................................................................13
4.1 Entering Calibration Mode.................................................................................................... 13
4.2 Calibration in mg/l or ppm of Oxygen................................................................................... 14
4.2.1 1-Point Calibration ....................................................................................................... 14
4.2.2 2-Point Calibration ....................................................................................................... 15
4.3 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 Enter Setup mode ................................................................................................................20
5.2 Configuration Settings..........................................................................................................21
5.3 Offset Settings...................................................................................................................... 23
5.4 Temperature Settings........................................................................................................... 25
5.5 Range Settings..................................................................................................................... 27
5.6 Hold Settings ........................................................................................................................ 28
5.7 Out of Range Settings .......................................................................................................... 29
5.8 Viewing Calibration Point ..................................................................................................... 30
5.9 Viewing Electrode Condition ................................................................................................ 31
5.10 Resetting .............................................................................................................................. 32
6. Technical Specifications.....................................................................................33
7. List of Accessories .............................................................................................35
7.1 Eutech Instruments ..............................................................................................................35
7.2 Oakton Instruments ..............................................................................................................36
8. Troubleshooting ..................................................................................................37
9. General Information ............................................................................................38
9.1 Warranty............................................................................................................................... 38
9.2 Return of Goods ................................................................................................................... 38
9.3 Guidelines for Returning Unit for Repair .............................................................................. 38
9.4 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 αlpha-DO 500
1. Introduction
1.1 Before You Begin
We thank you for purchasing the αlpha-DO 500 Transmitter.
The construction of the αlpha-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 αlpha-DO 500 Transmitter.
The instruction manual must always be stored close at hand, in a place
accessible to all people working with the αlpha-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
αlpha-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 αlpha-DO 500 Transmitter
(housings, sensors, etc.).
– Comply with local environmental and operational conditions.
1
Instruction Manual αlpha-DO 500
1.3 Safety Instructions
- The αlpha-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 αlpha-DO 500 Transmitter must only be operated under the
specified operating conditions (see section 5.9).
- The αlpha-DO 500 Transmitter must not be repaired by the
customer.
- No modifications to the αlpha-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
• First disconnect the unit from the power supply and then undo all electrical
connections.
• 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.
2
Instruction Manual αlpha-DO 500
2. Getting Started
2.1 Description of Instrument
The Eutech Instruments’ αlpha-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 αlpha-DO 500 Transmitter has many user-friendly and safety features
which include:
• Push-button keypad for calibration and setup
• Built-in non-volatile memory to ensure that calibration and other
information are not erased if power supply fails
• Menu-driven program that simplifies setup
• Automatic temperature compensation (ATC)
• Manual temperature compensation setting without the ATC probe, with
independent setting for calibration and process temperature
• Large dual display LCD for easy reading with clear multiple annunciators,
operational mode indicators and error indicators.
• Galvanically isolated current output of 4 to 20mA
• Hold function to freeze output current (22mA)
• Out of range current indication (3.8mA)
• Protection against electromagnetic interference
3
Instruction Manual αlpha-DO 500
2.2 Measurement and Control System
A typical measurement system consists of:
• A αlpha-DO 500 Transmitter
• A dissolved oxygen sensor with integrated or separate Pt100 temperature
sensor
• An appropriate measurement cable
• An immersion, flow or process assembly
• A chart recorder
Housing and
Sensors
Alpha DO500 Transmitter
2-wire Dissolved Oxygen Transmitter
Measurement Cable
Chart Recorder
lpha DO500
ESC
CAL
ENT
4 - 20 mA
Power Adaptor
(12 to 24 V DC)
4
Instruction Manual αlpha-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:
• SL2 – 12 to 24 V DC power
• 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. DO Input, +ve terminal 1. DC Power Supply +ve terminal
2. DO Input, -ve terminal 2. DC Power Supply –ve terminal
3. No Connection 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
5
Instruction Manual αlpha-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 100Ω 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
6
Instruction Manual αlpha-DO 500
2.4 Installation
2.4.1 Mechanical Dimensions
lpha DO500
ESC
CAL
2-wire Dissolved Oxygen Transmitter
2.4.2 Wall Mount
ENT
Cover the catch slots at
2
both sides with overlays
Pierce through holes at
11
both sides
7
Instruction Manual αlpha-DO 500
2.4.3 Panel Mount
Prepare panel cut-out of
1
1
92.0 mm X 92.0 mm
Remove back cover of
2
DO Transmitter and slide it
through panel cut-out
Gasket
Panel
Panel
Insert threaded rods through catch
4
until DO Transmitter is held against panel
Attach catch to both sides
3
of DO Transmitter
8
Instruction Manual αlpha-DO 500
2.5 Display & Keypad
2.5.1 Display Overview
The Liquid Crystal Display (LCD) of the αlpha-DO 500 Transmitter has two
alpha-numerical displays (Upper and a Lower).
• Upper display: Measured dissolved oxygen reading (in % saturation or
ppm or mg/l) is displayed when the Transmitter is in normal operation
(measurement) mode.
• 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.
Mode Indicators
MEAS
SETUP
CAL
Measurement mode (Refer Section 3.1)
Setup mode (Refer Section 5)
Calibration mode (Refer Section 4)
Status Annunciators
SETUP MEAS
READY
HOLD
K=
-
ERR
-
Upper Display
CAL
Lower Display
%
ppm
mg/l
°C
ATC
READY
HOLD
ATC
ERR
Appears when the reading is stable
Appears in Setup mode and Calibration mode to indicate that the relay function
is frozen
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.
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
9
(Refer Section 5.4)
Instruction Manual αlpha-DO 500
Units of Measurement Indicators
%
ppm
mg/l
ºC
Dissolved Oxygen in Percentage Saturation
Dissolved Oxygen in Parts Per Million
Dissolved Oxygen in milligram per liter
Temperature in Celsius (Refer Section5.4)
2.5.2 Key Functions
CAL
lpha DO500
ESC
ENT
Key Description
CAL
Enter Calibration mode
Enter Setup mode.
Access sub screens (parameters) within a group of settings in Setup
ENT
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)
2-wire Dissolved Oxygen Transmitter
Returns to Measurement mode when both keys are pressed
simultaneously.
10
Instruction Manual αlpha-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
°C
25.0
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:
From measurement mode you can access:
• Calibration mode (by pressing CAL key)
• Setup mode (by pressing ENT key)
For more details, refer section 4 for Calibration mode and section 5 for Setup
mode.)
To guarantee accurate readings, the measuring system (the DO
Transmitter and the sensor) must be calibrated regularly.
ATC
11
Instruction Manual αlpha-DO 500
3.2 Menu Overview
READY
MEAS
CAL
ENT
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
CAL
ENT ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
%
°C
ATC
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ENT
ENT
ENT
ENT ENT
ENT
ENT
ENT
12
Instruction Manual αlpha-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’.
READY
MEAS
ATC
%
°C
CAL
HOLD
CAL
To quit Calibration Mode
ENT
Calibration Mode
Calibration in or
Calibration in saturation
mg/l ppm
%
&
- See Section 4.3
- See Section 4.4
NOTES:
• 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.
• The calibration is always carried out in the units of measurement (mg/l
or ppm or %) selected in setup mode.
13
Instruction Manual αlpha-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.
1
CAL
HOLD
From measurement mode press CAL key to enter calibration mode as
11
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin calibration.
Select 1-point calibration: The display shows ‘1Pt CAL’. If ‘2Pt CAL’ is
2
shown, press ▲ or ▼ key to select ‘1Pt CAL’.
Press ENT key to confirm the selection.
3
The buffer annunciator
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.
HOLD
HOLD
2
CAL
READY
HOLD
CAL
Measured value should be
within +/- 50 % of high-point
2
2
CAL
3
ENTENTENT
mg/l
READY
MEAS
CAL
HOLD
ERR
Calibration error occurs if measured value
is not within +/- 50% of high-point
during 1-point calibration
4
mg/l
°C
ATC
+
mg/l
appears in LCD. The lower display shows ‘HI’,
Press ▲ or ▼ key to adjust the reading to 8.24 mg/l. The Transmitter
allows adjusting up to ±50% 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
4
measurement mode.
14
Instruction Manual αlpha-DO 500
A
NOTES:
• If the displayed value is more than ±10% 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.
• 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.
1
CAL
HOLD
ENT
HOLD
HOLD
2
CAL
READY
HOLD
ENT
2
2
CAL
ENT
READY
HOLD
Measured value should be
<10 % of high-point
CAL
CAL
4
ENT
mg/l
READY
MEAS
3
mg/l
ENT
HOLD
Calibration error occurs
if measured value is
<10% of high-point
during 1st point calibration
if measured value is not
within +/-50% of high-point
during 2nd point calibration
CAL
ERR
or
5
mg/l
°C
TC
+
mg/l
From measurement mode press CAL key to enter calibration mode as
11
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin first calibration point.
Select 2-point calibration: The display shows ‘1Pt CAL’. Press ▲ or ▼
2
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.
15
Instruction Manual αlpha-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
4
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.
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 ±50% 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
55
measurement mode.
NOTES:
• If the displayed value is more than ±10% 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.
• 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 αlpha-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).
4
%
°C
ATC
+
%
HOLD
CAL
1
HOLD
CAL
2
READY
HOLD
HOLD
Measured value should be
within +/- 50 % of high-point
2
2
CAL
CAL
3
%
ENTENTENT
READY
MEAS
CAL
HOLD
ERR
Calibration error occurs if measured value
is not within +/- 50% of high-point
during 1-point calibration
From measurement mode press CAL key to enter calibration mode as
11
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin first calibration point.
Select 1-point calibration: The display shows ‘1Pt CAL’. If ‘2Pt CAL’ is
2
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%.
The calibration is completed. The DO Transmitter reverts to
4
measurement mode.
17
Instruction Manual αlpha-DO 500
NOTES:
• 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.
• 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)
1
CAL
HOLD
ENT
HOLD
HOLD
From measurement mode press CAL key to enter calibration mode as
11
described in section 4.1. The LCD shows ‘CAL Do’. Press ENT key to
begin first calibration point.
CAL
CAL
2
READY
HOLD
ENT
2
2
READY
ENT
HOLD
Measured value should be
<10 % of high-point
CAL
CAL
4
ENT
READY
MEAS
3
ENT
%%
HOLD
Calibration error occurs
if measured value is
during 1st point calibration
if measured value is not
within +/-50% of high-point
during 2nd point calibration
CAL
ERR
<10% of high-point
or
5
%%
°C
ATC
+
Select 2-point calibration: The display shows ‘1Pt CAL’. Press ▲ or ▼
2
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.
18
Instruction Manual αlpha-DO 500
Press ENT key to confirm the reading.
NOTES:
• The transmitter proceeds to the second point of calibration
if the displayed reading is less than 10%
• 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
4
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.
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
55
measurement mode.
NOTES:
• If the displayed value is more than ±10% 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
• 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)
19
Instruction Manual αlpha-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.
READY
MEAS
ENT
%
°C
ATC
SETUP
HOLD
ENT
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
ENT
SETUP
HOLD
SETUP
HOLD
ENT
ENT ENT
ENT
20
Instruction Manual αlpha-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.
SETUP
HOLD
4
4
4
ENT
ENT
ENT
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
ppm
mg/l
2
%
ENT
2
2
SETUP
ENT
HOLD
This screen is skipped
if % is selected
ENT
3
SETUP
HOLD
ENT
SETUP
HOLD
SETUP
HOLD
1
11
SETUP
ENT
HOLD
SETUP
HOLD
SETUP
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 ENT key to access configuration setting (COF).
Selecting unit of measurement for DO: The display shows the ‘SEt
2
Unit’. The right corner of the LCD shows currently configured unit of
measurement for dissolved oxygen.
5
ENT
5
ENT
5
ENT
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 units of measurement for pressure: The upper display shows
4
‘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.
Setting pressure value: The upper display shows previously set
55
pressure value (if any); otherwise it shows the default value. The lower
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.
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Instruction Manual αlpha-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.
22
Instruction Manual αlpha-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.
SETUP
HOLD
1
From measurement mode press ENT key to enter setup mode as
11
SETUP
ENT
HOLD
This screen is skipped
if Offset is zero
1 2
%
2 sec.
SETUP
HOLD
SETUP
HOLD
SETUP
ENT
HOLD
2
ENT
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.
Selecting to modify offset: The upper display shows ‘OFS’. Press ▲ or
2
▼ key to select ‘YES’ or ‘nO’.
- Select YES to set an offset (or adjust the existing offset)
3
%
ENT
- Select nO to skip offset adjustment
Press ENT key to confirm your selection.
If ‘YES’ was selected:
Adjust the offset value: The upper display shows the currently
3
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.
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Instruction Manual αlpha-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.
24
Instruction Manual αlpha-DO 500
A
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.
SETUP
HOLD
°C
ATC
4
1
From measurement mode press ENT key to enter setup mode as
11
ENT
SETUP
HOLD
SETUP
HOLD
2
2
ENT
ENT
SETUP
HOLD
SETUP
HOLD
3
°C
TC
5 6
ENT
SETUP
HOLD
SETUP
HOLD
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).
Enable/disable ATC: The upper display shows ‘AtC’. The lower display
2
shows the last configured ATC selection (‘On’ or ‘OFF’).
Press ▲ or ▼ key to enable (AtC On) or disable (AtC OFF) automatic
temperature compensation.
ENT
ENT
Press ENT key to confirm your selection.
If ATC enabled (AtC On):
Setting temperature offset: The upper display shows the last
3
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.
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Instruction Manual αlpha-DO 500
As the lower display value changes, the Transmitter adjusts the
4
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):
Setting process temperature: The lower display shows ‘PºC’ and
55
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.
Press ENT key to confirm the process temperature.
Setting calibration temperature: The lower display shows ‘CºC’
6
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 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.
26
Instruction Manual αlpha-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.
Unit of
Measurement
Default
Lower Limit (LO)
Zoom Window
Default
Upper Limit (HI)
% saturation 0.00 199.9
ppm 0.00 19.9
mg/l 0.00 19.9
SETUP
HOLD
1
ENT
SETUP
HOLD
2
%
ENT
SETUP
HOLD
3
%
ENT
From measurement mode press ENT key to enter setup mode as
11
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).
Press ENT key to access range settings (SEt rng).
Select lower limit: The lower display shows ‘LO’. The upper display
2
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 confirm the value.
Select upper limit: The lower display shows ‘HI’. The upper display
3
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.
27
Instruction Manual αlpha-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.
SETUP
HOLD
1
ENT
SETUP
HOLD
SETUP
HOLD
2
ENT
2
ENT
From measurement mode press ENT key to enter setup mode as
11
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).
The upper display shows ‘HLd’ and the lower display shows the last
2
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 αlpha-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.
SETUP
HOLD
1
ENT
SETUP
HOLD
SETUP
HOLD
2
ENT
2
ENT
From measurement mode press ENT key to enter setup mode as
11
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).
The upper display shows ‘org’ and the lower display shows the last
2
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 αlpha-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.
SETUP
HOLD
1
ENT
SETUP
HOLD
2
%
ENT
From measurement mode press ENT key to enter setup mode as
11
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
The buffer annunciator appears in the LCD. The upper display shows
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.
30
Instruction Manual αlpha-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
SETUP
HOLD
1
ENT
SETUP
HOLD
K=
2
ENT
From measurement mode press ENT key to enter setup mode as
11
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
The electrode annunciator appears in the LCD. The upper display
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 αlpha-DO 500
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.
SETUP
HOLD
1
ENT
SETUP
HOLD
SETUP
HOLD
2
ENT
2
ENT
From measurement mode press ENT key to enter setup mode as
11
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).
The upper display shows ‘rSt’. The lower display shows ‘CAL’. Press ▲
2
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 αlpha-DO 500
6. Technical Specifications
General Specification
(a) Dissolved Oxygen (% saturation)
Measuring Range 0.00 to 199.9 %
Resolution 0.1 %
Relative Accuracy ± 1.5% of full-scale reading
(b) Dissolved Oxygen (ppm or mg/l)
Measuring Range 0.00 to 19.99 ppm or 0.00 to 19.99 mg/l
Resolution 0.01 ppm or 0.01 mg/l
Relative Accuracy ± 1.5% of full-scale reading
(c) Temperature
Measuring range 0.0 to +100.0 oC
Resolution 0.1
Relative accuracy ± 0.5 oC
Sensor
Calibration
(a) Dissolved Oxygen
Number of calibration points 1 or 2 points
(b) Temperature
Offset Adjustment ± 10 ˚C
o
C
Pt100 (2 wire or 3 wire)
Compensation
Temperature Compensation Automatic or Manual (0 to 50 oC)
Pressure Compensation 0.74 to 3.00 BAR
Salinity Compensation 0.0 to 50.0 ppt
Output Parameters
Output Current 4 to 20 mA (Galvanically Isolated)
Over/Under Range Output Current ON Select : 3.8 mA
HOLD Output Current ON Select : 22 mA
Load Resistance 600 ohms (max.) at 24V
Display
LCD 7 segments display with symbols for status information
Electrical Data and Connections
DO Input Screw Terminal (3.5mm pitch)
Connection terminal 8-pin & 3-pin terminal blocks
550 mmHg to 2250 mmHg (225 cmHg)
10.7 to 43.5 PSI
(Manual setting and automatic correction)
(Manual setting and automatic correction)
OFF Select: 4 mA (under range), 20 mA (over range)
OFF Select : Last measured current
33
Instruction Manual αlpha-DO 500
Other
Power Input 12 to 24 VDC
Dimensions (W x H x D) 96mm x 96mm x 66 mm
Weight (Estimated) 210g
Ambient Temp. operating range 0 to 40 oC
Maximum Relative Humidity 80% up to 31 oC decreasing linearly to 50% at 40oC
34
Instruction Manual αlpha-DO 500
7. List of Accessories
7.1 Eutech Instruments
Transmitter Replacement and Accessories
Item Description Order Code
Alpha-DO 500 Transmitter ECDOCTP0500
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) 01X241605
Set of 5 O-rings & membranes (DOTPII-S) 01X241606
Large O-ring (DO GENS/TPIIS) 32X246702
Tool for DOGEN-S Membrane Housing 15X241503
DO Refilling Electrolyte for EC-DOGEN-S (480ml bottle) ECDOGENSOLNBT
DO Refilling Electrolyte for EC-DOTPII-S (480ml bottle) ECDOTPIISOLNBT
ECDOGEN-S
ECDOTPII-S
35
Instruction Manual αlpha-DO 500
7.2 Oakton Instruments
Controller Replacement and Controller Accessories
Item Description Order Code
Alpha-DO 500 Transmitter 35151-10
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 Teflon membranes, 2 membrane O-
rings, 1 body seal O-ring, 125mL electrolyte
Set of 5 O-rings & Teflon membranes 35201-65
Replacement electrolyte solution for 35201-50, 500 mL 35640-71
NOTE:
• To order Oakton accessories, contact the nearest Oakton distributor
35201-50
35201-70
36
Instruction Manual αlpha-DO 500
8. Troubleshooting
Problem
Power on, but no display a) Loose connections
Unstable dissolved oxygen
reading
Oscillating temperature
readings
Slow response a) Dirty / Oily electrode a) Clean electrode
Blinking ATC
Blinking electrode
annunciator
Or (Dissolved oxygen)
Or (Temperature)
Cause
b) Power cables not in correct
polarity (+ & -)
c) Incorrect output voltage of
the power supply
a) Air bubbles in electrode
b) Dirty electrode
a) Electrical noise interference
a) No temperature probe
connection during ATC mode
a) Error in calibration
a) Dissolved oxygen electrode
is not connected
a) Temperature probe is not
connected when ATC
enabled
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) 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
37
Instruction Manual αlpha-DO 500
9. General Information
9.1 Warranty
Eutech Instruments warrants this product to be free from significant
deviations in material and workmanship for a period of one year from the date
of purchase. If repair is necessary and not the result of abuse or misuse
within the warranty period, please return by freight pre-paid and amendment
will be made without any charge. Eutech Instrument Customer Service Dept.
will determine if the product problem is due to deviations or customer abuse.
Out-of-warranty products will be repaired on an exchange basis at cost.
9.2 Return of Goods
Before returning goods for any reason whatsoever, the Customer Service
Dept. has to be informed in advance. Items must be carefully packed to
prevent damage during shipment, and insured against possible damage or
loss. Eutech Instruments/ Oakton Instruments will not be responsible for any
damage resulting from careless or insufficient packing.
Warning: Shipping damage as a result of inadequate packaging is the
user's/distributor’s responsibility. Please follow the guidelines below before
shipment.
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 αlpha 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.
38
Instruction Manual αlpha-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 Salinity (ppt)
o
C
0 32.0 14.6 13.8 13.0 12.1 11.3
1 33.8 14.2 13.4 12.6 11.8 11.0
2 35.6 13.8 13.1 12.3 11.5 10.8
3 37.4 13.4 12.7 12.0 11.2 10.5
4 39.2 13.1 12.4 11.7 11.0 10.3
5 41.0 12.7 12.1 11.4 10.7 10.0
6 42.8 12.8 11.8 11.1 10.5 9.8
7 44.6 12.1 11.5 10.9 10.2 9.6
8 46.4 11.8 11.2 10.6 10.0 9.4
9 48.2 11.5 11.0 10.4 9.8 9.2
10 50.0 11.3 10.7 10.1 9.6 9.0
11 51.8 11.0 10.5 9.9 9.4 8.8
12 53.6 10.7 10.3 9.7 9.2 8.6
13 55.4 10.5 10.1 9.5 9.0 8.5
14 57.2 10.3 9.9 9.3 8.8 8.3
15 59.0 10.1 9.7 9.1 8.6 8.1
16 60.8 9.8 9.5 9.0 8.5 8.0
17 62.6 9.6 9.3 8.8 8.3 7.8
18 64.4 9.4 9.1 8.6 8.2 7.7
19 66.2 9.2 8.8 8.5 8.0 7.6
20 68.0 9.1 8.7 8.3 7.8 7.4
21 69.8 8.9 8.6 8.1 7.7 7.3
22 71.6 8.7 8.4 8.0 7.6 7.1
23 73.4 8.6 8.3 7.9 7.4 7.0
24 75.2 8.4 8.1 7.7 7.3 6.9
25 77.0 8.2 8.0 7.6 7.2 6.7
26 78.8 8.1 7.8 7.4 7.0 6.6
27 80.6 8.0 7.7 7.3 6.9 6.5
28 82.4 7.8 7.6 7.1 6.8 6.4
29 84.2 7.7 7.4 7.0 6.6 6.3
30 86.0 7.6 7.3 6.9 6.5 6.1
31 87.8 7.4 7.1 6.7 6.4 6.0
32 89.6 7.3 7.0 6.6 6.3 5.9
33 91.4 7.2 6.9 6.5 6.2 5.8
34 93.2 7.1 6.8 6.5 6.1 5.7
35 95.0 7.0 6.7 6.4 6.0 5.6
36 96.8 6.8 6.5 6.2 5.9 5.5
37 98.6 6.7 6.4 6.1 5.8 5.4
38 100.4 6.6 6.3 6.0 5.7 5.3
39 102.2 6.5 6.3 5.9 5.6 5.2
40 104.0 6.4 6.3 5.8 5.5 5.2
o
F 0 10 20 30 40
39
Instruction Manual αlpha-DO 500
10.2 Appendix 2 – Abbreviations Used in LCD
Abbreviation Description
AtC
bAr
bUFF
CAL
CHg
CºC
ELE
FCt
Hg
HI
HLd
LO
OFS
Or
Org
PºC
PrE
PSI
rng
rSt
Set
Unt
Ur
1.Pt
2.Pt
Automatic Temperature Compensation
Pressure in Bar
Buffer
Calibration
Pressure in centimeter of mercury
Calibration Temperature
Electrode condition
Factory defaults
Pressure in millimeter of mercury
High limit
Hold
Low limit
Offset
Reading is over range
Out of range
Process Temperature
Pressure
Pressure in pounds per square inch
Range
Reset
Setting
Unit
Reading is under range
1-point calibration
2-point calibration
40
For more information on Eutech Instruments’ products, contact your nearest
distributor or visit our website listed below:
Eutech Instruments Pte Ltd.
Blk 55, Ayer Rajah Crescent,
#04-16/24 Singapore 139949
Tel: (65) 6778 6876
Fax: (65) 6773 0836
E-mail: marketing@eutechinst.com
Web-site: www.eutechinst.com
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