Thermo Fisher Scientific DO 500 User Manual

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Page 1

Alpha DO 500

Transmitter

Dissolved Oxygen

Page 2

AQUAfast, Cahn, ionplus, KNIpHE, pHISA, pHuture, Pure Water, Sage, Sensing the Future, SensorLink, ROSS, ROSS Ultra, Sure-Flow, Titrator PLUS and TURBO2 are registered trademarks of Thermo Fisher.

1-888-pHAX-ION, A+, All in One, Aplus, AQUAsnap, AssuredAccuracy, AUTO-BAR, AUTOCAL, AUTO DISPENSER, Auto-ID, AUTO-LOG, AUTO-READ, AUTO-STIR, Auto-Test, BOD AutoEZ, Cable-Free, CERTI-CAL, CISA, DataCOLLECT, DataPLUS, digital LogR, DirectCal, DuraProbe, Environmental Product Authority, Extra Easy/Extra Value, FAST QC, GAP, GLPcal, GLPcheck, GLPdoc, ISEasy, KAP, LabConnect, LogR, Low Maintenance Triode, Minimum Stir Requirement, MSR, NISS, One-Touch, One-Touch Calibration, One-Touch Measurement, Optimum Results, Orion Star, Pentrode, pHuture MMS, pHuture Pentrode, pHuture Quatrode, pHuture Triode, Quatrode, QuiKcheK, rf link, ROSS Resolution, SAOB, SMART AVERAGING, Smart CheK, SMART STABILITY, Stacked, Star Navigator 21, Stat Face, The Enhanced Lab, ThermaSense, Triode, TRIUMpH, Unbreakable pH, Universal Access are trademarks of Thermo Fisher.

Guaranteed Success and The Technical Edge are service marks of Thermo Fisher.

No Cal, ORION, perpHect, PerpHecT, PerpHecTion,

Page 3

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.

Page 4

Table of Contents

1. Introduction ...........................................................................................................1

1.1 Before You Begin ................................................................................................................... 1

1.2 Intended Use .......................................................................................................................... 1

1.3 Safety Instructions.................................................................................................................. 2

1.4 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 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 Thermo Scientific.................................................................................................................. 35

7.2 Eutech Instruments ..............................................................................................................36

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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

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Page 7

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.

Alpha pH500

Power Su pply

Chart recorde r

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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

Housing and Sensors

Alpha DO500 Transmitter

2-wire Dissolved Oxygen Transmitter

Measurement Cable

Chart Recorder

Alpha DO500

ESC

CAL

ENT

4 - 20 mA

Power Adaptor (12 to 24 V DC)

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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. DO Input, +ve terminal

2. DO Input, -ve terminal

1. DC Power Supply +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

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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

2-wire Dissolved Oxygen Transmitter

ENT

2.4.2 Wall Mount

Cover the catch slots at

both sides with overlays

Pierce through holes at

both sides

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Instruction Manual Alpha 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

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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

Mode Indicators

MEAS

SETUP

CAL

Measurement mode (Refer Section 3.1)

Setup mode (Refer Section 5)

Calibration mode (Refer Section 4)

Status Annunciators

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

SETUP MEAS

READY

HOLD

ERR

CAL

Lower Display

ppm mg/l

°C

ATC

(Refer Section 5.4)

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Instruction Manual Alpha 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

lpha DO500

ESC

CAL

2-wire Dissolved Oxygen Transmitter

ENT

Key Description

CAL

ENT

Enter Calibration mode

Enter Setup mode.

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

°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:

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.

x Calibration mode (by pressing CAL key)

x Setup mode (by pressing ENT key)

ATC

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Instruction Manual Alpha DO 500

3.2 Menu Overview

READY

MEAS

CAL

°C ATC

ENT

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

CAL

ENT ENT

ENT

SETUP

HOLD

ENT ENT

Page 19

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’.

READY

MEAS

CAL

°C

ATC

HOLD

CAL

ENT

Calibration in or Calibratio n in saturation

Calibration Mode

mg/l ppm %

- See Sectio n 4.3

- See Sectio n 4.4

To quit Calibration Mode

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

HOLD

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.

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.

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 calibration is completed. The DO Transmitter reverts to

measurement mode.

CAL

HOLD

READY

HOLD

Measured value should be

within +/- 50 % of high-point

CAL

HOLD

CAL

mg/l

MEAS

READY

ENTENTENT

HOLD

ERR

Calibration error occurs if measured value

is not within +/- 50% of high-point

during 1-point calibration

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.

mg/l

°C

ATC

CAL

mg/l

Page 21

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 To exit from calibration mode without confirming calibration, press 

and  keys together.

x 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

HOLD

ENT

HOLD

CAL

READY

HOLD

CAL

HOLD

READY

ENT

HOLD

CAL

mg/l

ENT

CAL

mg/l

READY

ENT

HOLD

Measured value should be

<10 % of high-point

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

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

MEAS

ERR

CAL

mg/l

°C

ATC

mg/l

begin first calibration point.

Select 2-point calibration: The display shows ‘1Pt CAL’. Press  or 

key to select ‘2Pt CAL’.

Press ENT key to confirm the selection.

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.

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.

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 To exit from calibration mode without confirming calibration, press 

and  keys together.

x When calibrating with manual temperature compensation, the

Page 23

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).

HOLD

CAL

READY

HOLD

Measured value should be

within +/- 50 % of high-point

CAL

HOLD

CAL

MEAS

READY

ENTENTENT

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

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

shown, press  or  key to select ‘1Pt CAL’.

Press ENT key to confirm the selection.

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

measurement mode.

°C

ATC

CAL

Page 24

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 To exit from calibration mode without confirming calibration, press 

and  keys together.

x When calibrating with manual temperature compensation, the

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

HOLD

ENT

HOLD

CAL

READY

HOLD

CAL

HOLD

READY

ENT

HOLD

Measured value should be

<10 % of high-point

CAL

ENT

READY

MEAS

ENT

CAL

ENT

HOLD

ERR

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

°C

ATC

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.

Select 2-point calibration: The display shows ‘1Pt CAL’. Press  or 

key to select ‘2Pt CAL’.

Press ENT key to confirm the selection.

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.

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.

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 To exit from calibration mode without confirming calibration, press 

and  keys together

x When calibrating with manual temperature compensation, the

Page 26

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

SETUP

ATC

ENT

HOLD

ENT

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

ENT

ENT ENT

ENT

Page 27

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.

SETUP

HOLD

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

ppm

mg/l

ENT

SETUP

ENT

HOLD

This screen is skipped

if % is selected

ENT

SETUP

HOLD

ENT

SETUP

HOLD

SETUP

HOLD

SETUP

ENT

HOLD

SETUP

ENT

HOLD

SETUP

ENT

HOLD

(COF). Press ENT key to access configuration setting (COF).

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:

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.

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.

Setting pressure value: The upper display shows previously set

pressure value (if any); otherwise it shows the default value. The lower

ENT

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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.

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

SETUP

ENT

HOLD

This screen is skipped

if Offset is zero

1 2

2 sec.

SETUP

HOLD

SETUP

HOLD

SETUP

ENT

HOLD

ENT

(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

 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:

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.

ENT

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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.

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

SETUP

ENT

HOLD

SETUP

HOLD

SETUP

ENT

HOLD

SETUP

ENT

HOLD

°C

ATC

5 6

SETUP

HOLD

SETUP

ENT

HOLD

(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

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):

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.

ENT

°C

ATC

ENT

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Instruction Manual 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):

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.

Press ENT key to confirm the process temperature.

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 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.

Unit of

Measurement

Default

Lower Limit (LO)

% saturation 0.00 199.9

ppm 0.00 19.9 mg/l 0.00 19.9

Zoom Window

Default

Upper Limit (HI)

SETUP

HOLD

SETUP

ENT

HOLD

SETUP

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 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

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

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.

ENT

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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.

SETUP

HOLD

SETUP

ENT

HOLD

SETUP

HOLD

ENT

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).

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.

SETUP

HOLD

SETUP

ENT

HOLD

SETUP

HOLD

ENT

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).

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.

SETUP

HOLD

SETUP

ENT

HOLD

ENT

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).

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.

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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

SETUP

HOLD

SETUP

ENT

HOLD

ENT

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).

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 Alpha 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

SETUP

ENT

HOLD

SETUP

HOLD

ENT

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).

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 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

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

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

HOLD Output Current ON Select : 22 mA

Load Resistance 600 ohms (max.) at 24V

Display

LCD 7 segments display with symbols for status

Electrical Data and Connections

DO Input Screw Terminal (3.5mm pitch) Connection terminal 8-pin & 3-pin terminal blocks

Pt100 (2 wire or 3 wire)

550 mmHg to 2250 mmHg (225 cmHg)

10.7 to 43.5 PSI (Manual setting and automatic correction)

(Manual setting and automatic correction)

ON Select : 3.8 mA OFF Select: 4 mA (under range), 20 mA (over range)

OFF Select : Last measured current

information

Page 40

Instruction Manual Alpha 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

0 to 40 oC range Maximum Relative Humidity 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 Order Code

Alpha DO 500 Transmitter TSDOCTP0500 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

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Instruction Manual Alpha DO 500

7.2 Eutech 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:

x To order Eutech accessories, contact the nearest Oakton distributor

35201-50

35201-70

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Instruction Manual Alpha DO 500

8. Troubleshooting

Problem

Power on, but no display

Unstable dissolved oxygen reading

Oscillating temperature readings

Slow response a) Dirty / Oily electrode a) Clean electrode Blinking ATC a) No temperature probe

Blinking electrode

annunciator

Or (Dissolved oxygen)

Or (Temperature) a) Temperature probe is

Cause

a) Loose connections 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

connection during ATC mode

a) Error in calibration a) Ensure calibration standard

a) Dissolved oxygen

electrode is not connected

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

solution is not contaminated. Ensure electrode is clean.

a) Ensure electrode makes

good contact with Transmitter

a) Ensure electrode makes

good contact with Transmitter

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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 Salinity (ppt)

F 0 10 20 30 40

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

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Instruction Manual Alpha DO 500

10.2 Appendix 2 – Abbreviations Used in LCD

Abbreviation Description

AtC

bAr

bUFF

CAL

CHg

CºC

ELE

FCt

HLd

OFS

Org

PºC

PrE

PSI

rng

rSt

Set

Unt

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

Page 47

Page 48

Water Analysis Instruments

North America

166 Cummings Center Beverly, MA 01915 USA Toll Free: 1-800-225-1480 Tel: 1-978-232-6000 Dom. Fax: 1-978-232-6015 Int’l Fax: 978-232-6031

Europe

P.O. Box 254, 3860 AG Nijkerk Wallerstraat 125K, 3862 CN Nijkerk, Netherlands Tel: (31) 033-2463887 Fax: (31) 033-2460832

Asia Paciﬁc

Blk 55, Ayer Rajah Crescent #04-16/24, Singapore 139949 Tel: 65-6778-6876 Fax: 65-6773-0836

www.thermo.com/process

68X216876 Rev 4