Eutech Instruments αlpha-DO500 Instruction Manual

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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.

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.

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.

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

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)

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

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

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

both sides with overlays

Pierce through holes at

both sides

Instruction Manual αlpha-DO 500

2.4.3 Panel Mount

Prepare panel cut-out of

92.0 mm X 92.0 mm

Remove back cover of

DO Transmitter and slide it through panel cut-out

Gasket

Panel

Insert threaded rods through catch

until DO Transmitter is held against panel

Attach catch to both sides

of DO Transmitter

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

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

(Refer Section 5.4)

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