Eutech Instruments DO 1000 User Manual

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Instruction Manual

αlpha-DO 1000

Dissolved Oxygen Controller/Transmitter

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68X242101 Rev 3, 06/04

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Preface

This manual serves to explain the use of the αlpha-DO1000 series Dissolved Oxygen controller/transmitter. The manual functions in two ways: firstly as a stepby-step guide to help the user operate the instrument. Secondly, it serves as a handy reference guide. This instruction manual is written to cover as many anticipated applications of the αlpha-DO1000 Dissolved Oxygen controller/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 Pte Ltd.

Eutech Instruments cannot accept any responsibility for damage or malfunction of the unit due to improper use of the instrument.

Eutech Instruments Pte Ltd.

Rev 3, 06/04

Operating Manual alpha DO 1000

Safety Information

The Eutech Controller/ Transmitter shall be installed and operated only in the manner specified in the Instruction manual. Only skilled, trained or authorized person should carry out installation, setup and operation of the instrument.

Before powering up the unit, make sure that power source it is connected to, is as specified in the top label. Failure to do so may result in a permanent damage to the unit.

The unit has live and exposed parts inside. If it has to be opened, make sure that the power to the unit is off and disconnected.

The unit is Fuse protected. In the event the fuse has to be replaced, use only those as specified in the manual.

Operating Manual alpha DO 1000

TABLE OF CONTENTS

1 INTRODUCTION ..................................................................................... 1

1.1 Description of Unit................................................................................................................1

1.2 Applications...........................................................................................................................1

2 ASSEMBLY AND INSTALLATION .........................................................2

2.1 Measurement and Control System .....................................................................................2

2.2 Unit Dimensions....................................................................................................................2

3 ELECTRICAL CONNECTION .................................................................3

3.1 Connection Diagram.............................................................................................................3

3.2 Back Panel.............................................................................................................................4

4 OVERVIEW.............................................................................................. 6

4.1 Keypad and Display..............................................................................................................6

4.1.1 Keypad......................................................................................................................6

4.1.2 Display......................................................................................................................6

4.2 Function Groups...................................................................................................................7

4.2.1 How to view operating parameters without access to change them: ......................7

4.3 Control Concept....................................................................................................................8

5 MEASUREMENT.....................................................................................9

5.1 Display in Measurement mode............................................................................................9

5.1.1 Check electrode performance...................................................................................9

5.1.2 Checking set points...................................................................................................9

5.2 Security Codes.....................................................................................................................10

5.2.1 How to enter and change parameters in Calibration mode ..................................10

5.2.2 Clearing the Calibration security code from the display.......................................10

5.2.3 How to enter and change parameters in Advanced Setup mode ...........................10

5.2.4 Clearing the Advanced Setup Security Code from the Display .............................11

6 CALIBRATION MODE .......................................................................... 12

6.1 Dissolved Oxygen Calibration...........................................................................................12

6.2 Dissolved Oxygen Calibration in % Saturation of Oxygen ...........................................13

7 ADVANCED SET-UP MODE.................................................................15

7.1 Electrode Offest (OFS), Salinity and Pressure sub-function .........................................15

7.2 Setting the Salinity Value...................................................................................................16

7.3 Setting the Pressure Value (mmHg or Pascal) ................................................................16

7.4 Setting Temperature (Set °C) sub-function .....................................................................1 7

7.4.1 Selecting Automatic or Manual Temperature Compensation................................17

7.4.2 Temperature calibration (ATC mode only)............................................................17

7.4.3 Setting Manual Temperature Compensation .........................................................18

7.5 Control Relay A/Control Relay B (SP1/SP2) sub-function ............................................18

7.5.1 Entering the Set point 1 (or Set point 2) sub-function...........................................19

7.5.2 Selecting the Set Point Values................................................................................19

7.5.3 Choosing High or Low Set-points..........................................................................19

7.5.4 Selecting a Hysteresis (Dead Band) Value............................................................20

7.5.5 Setting an On-Delay Time Lag...............................................................................20

7.5.6 Setting an Off-Delay Time Lag...............................................................................21

7.6 Controller (Cntr) Sub-Function........................................................................................22

Operating Manual alpha DO 1000

7.6.1 Entering the Controller sub-function.....................................................................22

7.6.2 Choosing the controller type (limit or proportional).............................................22

7.6.3 Choosing Break/Make Contact Relay Type ...........................................................23

7.6.4 Selecting Proportional Range Value, Xp...............................................................23

7.6.5 Maximum Pulse Length (tPL) or Maximum Frequency (FPF).............................24

7.7 Current Output (rng) sub-function ..................................................................................25

7.7.1 Entering Current Output sub-function...................................................................25

7.7.2 Choosing the Output Type......................................................................................25

7.7.3 Selecting Dissolved Oxygen Value at 0(4)mA........................................................25

7.7.4 Selecting Dissolved Oxygen value at 20mA...........................................................26

7.8 Configuration (ConF) sub-function..................................................................................26

7.8.1 Entering the Configuration sub-function ...............................................................26

7.8.2 Selecting the Units Of Measure (mg/l, ppm or %).................................................27

7.8.3 Selecting the Alarm Time Lag ................................................................................27

7.8.4 Selecting Steady or Pulse Contact for the Alarm Relay ........................................27

7.8.5 Selecting Dissolved Oxygen Probe Type................................................................28

7.8.6 Reverting to Factory Default Settings....................................................................28

7.9 Calibration (CAL) sub-function........................................................................................29

7.9.1 Entering Calibration mode from Advanced Set-up mode ......................................29

8 AUTO/MANUAL MODE ........................................................................ 30

8.1 Auto Mode (Mode After Switch-On)................................................................................30

8.2 Manual Mode ......................................................................................................................30

9 TECHNICAL SPECIFICATIONS ...........................................................32

10 ACCESSORIES..................................................................................... 33

10.1 Assembly Accessories.........................................................................................................33

11 GENERAL INFORMATION ................................................................... 34

11.1 Warranty .............................................................................................................................34

11.2 Packaging.............................................................................................................................34

11.3 Return of Goods..................................................................................................................34

11.4 Guidelines for Returning Unit for Repair .......................................................................34

12 APPENDICES........................................................................................ 35

12.1 Appendix 1 – Jumper Positions for 110 or 230 volts ......................................................35

12.2 Appendix 2 – Salinity vs Temperature (@ 760 mmHg) .................................................36

12.3 Appendix 3 - Explanation on the Function of Hysteresis...............................................37

12.4 Appendix 4 – Limit and Proportional Control Functions..............................................38

1 INTRODUCTION

1.1 Description of Unit

Thank you for purchasing Eutech’s ¼ DIN alpha-1000 series Dissolved Oxygen process controller. This unit is used for measuring either in % saturation, mg/l or ppm, one at a time, and the operational mode is switchable from the menu. You can use this unit to measure Dissolved Oxygen with limit or proportional control. This controller has many user-friendly and safety features which include:

• Menu-driven program that simplifies set-up

• Built-in Memory backup to ensure that calibration data and other information

are not erased if power supply fails

• Push-button one-/two-point calibration and electrode offset adjustment from the keypad

• Automatic temperature compensation (ATC)

• Manual temperature compensation with independent setting for calibration

and process temperature

• 0 to 1999 second time delay adjustment on all relays – minimise false alarms

• Separately adjustable high and low set point hysteresis (dead bands)

prevent chattering of relays around the set points

• Three control modes: limit control, proportional pulse length or proportional pulse frequency

• Large dual display LCD for easy reading with clear multiple annunciators, alarm status and operational message annunciators

• Two switching contacts as set-point triggering relays and an alarm output relay

• Separate alarm relay alerts you when set points have exceeded the limits and if the Pt100 wires are broken or disconnected during the ATC function

• Hold function freezes output current (0/4...20mA) and releases control relays

• LED indicators signal control activities to monitor controller status from a

distance

• Protection against electromagnetic interference - galvanically isolated 0/4 - 20mA output provides safety for data logging and control purposes

1.2

Applications

Use this controller in panel mounted enclosures for applications such as water treatment and monitoring, galvanic-decontamination, chemical processing, food processing, clean or waste water control and neutralization process.

Operating Manual alpha DO 1000

2 ASSEMBLY AND INSTALLATION

2.1 Measurement and Control System

A typical measurement system consists of:

• an αlpha-DO1000 process controller

• a Dissolved Oxygen probe with integrated temperature sensor Pt100

• an immersion, flow or process assembly

• a final control element such as pump or valve, and

• a chart recorder

Flow Assembly

lpha-DO 1000 Controller

lpha-DO 1000

Measurement Cable

DO Electrode

2.2 Unit Dimensions

Power Mains

(220/110 VAC)

The field-tested control panel housing is 96 x 96 mm; with protection class IP 54 (front).

Note: The Taped Corners Have to Be On Top

Flat Gasket (1mm)

(TobeInsertedByCustomer)

Chart Recorder

Alarm / Siren

System

92 + 0.5

Mounting Cut-Out

max. 175

max. 45

Operating Manual alpha DO 1000

3 ELECTRICAL CONNECTION

ENSURE that the power cable is physically separated from the power

supply.

3.1 Connection Diagram

Power Mains

18 19 20

PE/S

Pt100

Relay 1

PEAC: NL

Relay 2

78 9

Signal Input DO

Alarm

-ve

12 13

+ve

* ) indicated contact positions are for currentless or no error conditions

PE/S

Signal OutputHold Input

151715

Operating Manual alpha DO 1000

3.2 Back Panel

The back panel consists of two connectors. The first connector is the 17-way PCB edge connector and the other is the 5-way connector.

ENSURE that the power cable is physically separated from the power supply.

Connection for the 17-way screw terminals (from left to right):

Pin No Description Pin No Description

1 AC mains live wire 10 Alarm relay resting position (NO)

2 AC mains neutral wire 11 Alarm relay common

3 AC mains protective earth wire 12 Alarm relay working position (NC)

4 Low set relay resting position (NC) 13 Hold function switch terminal 1

5 Low set relay common 14 Hold function switch terminal 2

6 Low set relay working position (NO) 15 No connection

7 High set relay resting position (NC) 16 0/4 - 20 mA for -ve connection

8 High set relay common 17 0/4 - 20 mA for +ve connection

9 High set relay working position (NO)

Connections for the 5-way screw terminals (please refer to DO probe wiring instruction manual):

Pin No Description DO Probe Wiring Colour

18 Pt100 lead 1 White

19 Pt100 sense lead Red

20 Pt100 lead 2 Black

21 Cathode, –ve connection Green

22 Anode, +ve connection Yellow

Operating Manual alpha DO 1000

DO Probe

Pt100

FUSE 250VAC

(F)

100mA

LNPE

RELAY1

LARMRELAY2

HOLD

IMPORTANT: The Alarm relay functions as an “Active Low” device

i.e. it switches OFF under Alarm condition. Therefore the Alarm display device should be connected to the ‘NC’ contacts of the relay.

Operating Manual alpha DO 1000

4 OVERVIEW

4.1 Keypad and Display

4.1.1 Keypad

• Perform rapid calibration

• Allows entry to Set up mode

• Select individual functions within the function group of Set up mode

• Store input data in the Set up mode

• Start calibration in the calibration mode

• Select various function groups in the Set up mode.

• Set parameters and numerical values in sub functions of Set up mode

4.1.2 Display

The LCD display features two numerical displays that show status messages and measured values for easy, quick reference. The display provides short-text information for setting parameters and configuration.

READY

If pressed continuously, the setting speed increases

• Control the relays in the MANUAL function

• Return to the Measurement mode when both keys are pressed together

• Switch between AUTO and MANUAL relay operation using a code

• Display limit set-point values for the switch contacts in AUTO relay operation

mode

• Switch between RELAY A and RELAY B in MANUAL relay operation mode

MEAS CALSETUPHOLD

-8.8.8.8

-1.8.8.8

• Display for RELAY A/B. Green LED indicates measured value within limit while RED LED indicates measured value outside limit.

• Alarm display if limit value overshoot or the ATC connection is broken.

• HOLD: Relay position and current output are frozen

• SETUP: Set-up mode of function groups

ppmt

mg/l

• MEAS: Measurement mode

• CAL: Calibration mode of Dissolved Oxygen

• READY: Comes on after a successful calibration

ATC

• ATC: Comes on in the ATC mode. Disappears in the Manual temperature Compensation mode. “ATC” flashes if the temperature probe is faulty in its ATC mode

Operating Manual alpha DO 1000

4.2 Function Groups

The main function and sub-function groups are organised in a matrix format for configuration and selection of parameters. The main function groups are:

 Offset adjustment (OFS). See Section 7.1.

 Temperature Measurement / compensation settings (SEt °C). See Section 7.4.

 Control relay 1 configuration (SP1). See Section 7.5.

 Control relay 2 configuration (SP2). See Section 7.5.

 Control type (Cntr). See Section 7.6.

 Current output (rng). See Sections 7.7.

 Configuration (ConF). See Section 7.8.

 Calibration (CAL dO). See Sections 6 & 7.9.

HOLD SETUP HOLD SETUP HOLD HOLDSETUP SETUP

ofs

HOLD SETUP

Sp1

HOLD SETUP HOLD SET UP

Sp2

HOLD SETUP

Cal

The set-up parameters can be viewed or changed by entering a security code. See Section 5.2 for security code information.

4.2.1 How to view operating parameters without access to change them:

1. Press the ENTER key. The display will prompt the user to enter a security code (S.Cd). Leave the security code at “000” (do not enter a security code).

2. Press ENTER key again. This allows you only to view (not change) any sub-functions’ settings.

3. Press the ▲ or ▼ keys to scroll through the sub-functions.

4. Press the ENTER key at a particular sub-function to view in detail.

5. Press the ENTER key to return to the sub-function menu.

6. Press the ▲ or ▼ keys simultaneously (as an Escape key) at any time to return to the Measurement mode.

000

Note: To simplify operations, the controller will not display parameters

that are not relevant to a particular sub-function. For example: If the user set the controller for Limit control, it will not display pulse length/frequency settings.

Operating Manual alpha DO 1000

4.3 Control Concept

The main function and sub-function groups are organised in a matrix format as shown below. These functions can be accessed via the front keypad for configuration and selection of parameters.

MEASURE

CODE

OFFSET

SET C

SET-POINT 1

SET-POINT 2

CONTROLLER

OUTPUT RANGE

CONFIGURATION

CALIBRATION

Set Offset Set Salinity Set Pressure

Switch On / Off ATC

Set value 1

Set value 2

Controller type

Current Outpu t

0..20/4..20 mA

Set Measuremen t

Units

Calibration

Points

Process tem p.

(MTC)

MIN / MAX

Function

MIN / MAX

Funct ion

N.O./N.C.

contact

mg/l at 0/4 mA

Alarm D elay

Calibrate

Calib. temp.

Hysteresis 1

Hysteresis 2

Proportional

range X

mg/l at 20 mA

Alarm contact

cont./wiper c ontact

Electrode

(MTC)

Status

Calibrate Pt100

Pick-up delay

contact 1

Pick-up delay

contact 2

Cycle time bzw. max. frequency

Electro de Type

Dropout delay

contact 1

Dropout delay

contact 2

Reset to factory default set tings

The controller offers two levels of password protection: (1) for direct access to calibration function and (2) for setting or editing specific controller parameters or functions in the SETUP mode to suit individual requirements.

Note: The passwords are not user-defined and have been set by

factory. It is very important to keep these passwords strictly confidential to avoid unauthorised tampering of the system at all times.

Note: If the user reads parameters only, the controller automatically

reverts to Measurement mode if none of the keys is pressed for 30 seconds.

Operating Manual alpha DO 1000

5 MEASUREMENT

5.1 Display in Measurement mode

When the controller is initially powered on, it automatically enters into the Measurement mode after the large dual LCD displays all segments briefly.

The upper display shows the measured Dissolved Oxygen value, while the lower display shows the temperature value. Annunciators at the right side of the display indicate measurement units: ppm, mg/l or % measurement. Similarly annunciators or icons at the top or left side of the display shows the current status of controller, e.g. “HOLD”, “SETUP”, “MEAS”, “CAL”, “READY”, etc.

5.1.1 Check electrode performance

To read current electrode slope and offset values without changing them:

1. Press the CAL key followed by the ENTER key without adjusting the security code (leave code at “000”). The upper display shows the condition of the probe. The lower display reading shows the temperature reading.

2. Press the ENTER key a second time to return to Measurement mode.

Note: If security code is changed to a value other than “000”,

pressing the ENTER key will return to the Measurement mode, without displaying electrode information.

5.1.2 Checking set points

To read current set point values without changing them:

1. Press the RELAY Selection (Rel A / Rel B) key. The upper display shows the set point for Relay A; the lower display shows “SP1”.

2. After two seconds the upper display shows the set-point value for Relay B; the lower display shows “SP2”.

3. After an additional two seconds, the controller returns to the Measurement mode.

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