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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.
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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
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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)