EUTECH INSTRUMENTS Alpha-pH1000 User manual

EUTECH INSTRUMENTS

alpha-pH1000

pH and ORP Controller/Transmitter

Operating Instructions

68X216801 rev1 Technology Made Easy ...

08/01

Preface

This manual serves to explain the use of the αlpha-pH1000 series pH/ORP controller/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 as many anticipated applications of the αlpha-pH1000 pH/ORP 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.



1997 Eutech Instruments Pte Ltd. Revised in August 2001.

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.

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 5

4 OVERVIEW 6

4.1 Keypad and Display 6

4.2 Function Groups 7

4.3 Control Concept 8

5 MEASUREMENT 9

5.1 Display in Measurement mode 9

5.2 Security Codes 9

6 CALIBRATION MODE 11

6.1 pH Calibration 11

6.2 ORP – mV Calibration 12

6.3 ORP -% Calibration 13

7 ADVANCED SET-UP MODE 14

7.1 Electrode Offset (OFS) sub-function 14

7.2 Setting temperature (Set oC) sub-function 14

7.3 Control Relay A/Control Relay B (SP1/SP2) sub-function 16

7.4 Controller (Cntr) sub-function 18

7.5 Current Output (rng) sub-function 20

7.6 Configuration (ConF) sub-function 21

7.7 Calibration (CAL) sub-function 24

8 AUTO/MANUAL MODE 25

8.1 Auto mode (mode after switch-on) 25

8.2 Manual mode 25

9 TECHNICAL SPECIFICATIONS 26

10 ACCESSORIES 28

11 GENERAL INFORMATION 29

11.1 Warranty 29

11.2 Packaging 29

11.3 Return of Goods 29

11.4 Guidelines for Returning Unit for Repair 29

12 APPENDICES 30

12.1 Appendix 1 30

12.2 Appendix 2 31

12.3 Appendix 3 32

12.4 Appendix 4 33

alpha-pH 1000

1 INTRODUCTION

1.1 Description of Unit

Thank you for purchasing Eutech’s ¼ DIN alpha-1000 series pH/ORP process controllers. This unit

is used for measuring either pH or ORP parameter one at a time, and the operational mode is

switchable from the menu. You can use this unit to measure pH or ORP with proportional or limit

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 and other information are not erased if

power supply fails

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

•Automatic temperature compensation (ATC)

•Manual temperature compensation setting without the ATC probe, with independent setting

for calibration and process temperature

•0 to 2000 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

•Asymmetrical/symmetrical input for pH/ORP mode of operation

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

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

operational and error messages

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

•A third relay that can be set up to perform either Alarm or Wash function

•When set to work as Alarm relay, alerts you to set points exceeded for a set-point limits for

certain time and if the Pt100/Pt1000 wires are broken or disconnected during the ATC function

•Programmable duration and frequency in the Wash mode

•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

•Choice of 7 buffers from USA or NIST standards

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 neutralisation process.

alpha-pH 1000

2 ASSEMBLY AND INSTALLATION

2.1 Measurement and Control System

A typical measurement system consists of:

•a pH/ORP process controller

•a pH/ORP combination electrode with integrated or separate temperature sensor Pt 100/1000,

•an immersion, flow or process assembly with or without a potential matching pin (PMP)

•a final control element such as pump or valve

•a recorder and

•an appropriate pH or ORP measurement cable.

2.2 Unit Dimensions

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

max.175 max. 45

Mounting Cut-Out

Flat

asket

(

1mm

)

(TobeInsertedByCustomer)

Note: The Taped Corners Have to Be On Top

92 + 0.5

Power Mains

(220/110 VAC)

Flow Assembly

Measurement Cable

Process Assembly

hEl

Chart Recorder

pH Controller

ALARM

REL A

REL B

ESC

CAL

ENTER

REL A

AUTO

REL B

MANU

7.02

25.0

ATC

MEAS

alpha-pH1000

alpha-pH 1000

3 ELECTRICAL CONNECTION

3.1 Connection Diagram

nal OutputHold Input

Relay B

Relay A

Power Mains

Alarm/Wash

PE/S

PEAC: NL

78 9 10 11 12 13 14 15 17

15 16

* ) indicated contact positions are for currentless conditions

Pt 100

Potential Matchin

Pin (PMP) Si

nal Input pH/ORP

PE/S

18 19 20 21 22

S/S/

BNC

alpha-pH 1000

Symmetrical high-impedance

connections

Asymmetrical connections

Measuring Cable

pH Combination

Electrode

Temp. pH

BNC

0/PA

PE NLS

22 21

23 20 19 18

Potential

Matching Pin (PM)

alpha-pH 1000

3.2 Back Panel

Caution: Ensure electrical mains is disconnected before proceeding.

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.

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

1. AC mains live wire 10. Alarm/Wash relay working position (NO)

2. AC mains neutral wire 11. Alarm/Wash relay common

3. AC mains protective earth wire 12. Alarm/Wash relay resting 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:

18. Pt100/Pt1000 lead 1 terminal

19. Pt100/Pt1000 sense lead terminal

20. Pt100/Pt1000 lead 2 terminal

Note: If using a two-wire RTD, short terminal 19 to terminal 18.

Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100. See Appendix 1 for

directions on switching the RTD type.

21. pH/ORP (potential matching pin)

21. pH/ORP (shield)

0V/

Pt100/

RELAY A

100mA (F)

FUSE 250VAC

HOLD

ALARM / WASHRELAY B

Pt1000

PAL

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 (11 and 12). In the Wash mode, the relay works on a positive mode. Therefore, the Wash

device should be connected to the contacts 10 and 11.

alpha-pH 1000

4 OVERVIEW

4.1 Keypad and Display

4.1.1 Keypad

CAL

•Perform rapid 2-point 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

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

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.

7.00

25.0 ATC

SETUP

HOLD

CAL

MEAS CON

READY pH

ERR oC

•

••

•MEAS: Measurement mode

•

••

•SETUP: Set-up mode of function groups

•

••

•CAL: Calibration mode of pH/ORP and temperature

•

••

•READY: Comes on after a successful calibration

•

••

•HOLD: Relay position and current output are frozen

•

••

•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

•

••

•ERR: Error or alarm indicator

•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 probe fails; with ERR annunciator

appears on the display. Wash display if cleaning cycle is on.

Table of contents

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