Eutech Instruments ALPHA PH 800 User Manual

EUTECH INSTRUMENTS

ααααlpha-pH800

pH and ORP Controller/Transmitter

Operating Instructions

68X216813 03/99

Preface

Thank you for purchasing the αlpha-pH800 series pH/ORP controller/transmitter.

This manual serves to explain the us e of th e αlpha-pH800 series pH/ORP controller/transm itter. The manual functions in two ways, fir stly as a ste p by step guide to help t he user op erate the instr um ent. Second l y, it serv es as a handy referenc e guide. T his instr uctio n m anual is writ ten to c over as many anticipated applications of the αlpha-pH800 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, an d does not r eprese nt a com m itment 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. Blk 55, Ayer Rajah Crescent #04-14/24, Singapore 139 949. Tel: (65) 778 6876; Fax: (65) 773 0836; e-mail:

marketing@eutechinst.com; Home page: http://www.eutechinst.com

TABLE OF CONTENTS

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

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

1.2 Applications................................................................................................ 2

2 ASSEMBLY AND INSTALLATIONS............................................................. 3

2.1 Measurement and Control System........................................................ 3

2.2 Unit Dimensions.......................................................................................3

3 ELECTRICAL CONNECTIONS....................................................................... 4

3.1 Connection Diagram................................................................................ 4

3.2 Back Panel................................................................................................ 6

4 OVERVIEW....................................................................................................... 8

4.1 Keypad and Display................................................................................. 8

Function Groups................................................................................................... 9

4.2 Control Concept ....................................................................................... 9

5 MEASUREMENT............................................................................................ 10

5.1 Display in Measurem ent m ode ............................................................ 10

6 CALIBRATION............................................................................................... 11

6.1 pH Calibration......................................................................................... 11

6.2 ORP – mV Calibration........................................................................... 13

7 ADVANCED SET UP MODE......................................................................... 14

7.1 Electrode Offset (OFS) sub-function................................................... 14

7.2 Setting temperature (Set

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

7.4 Configuration (ConF) sub-function ...................................................... 22

7.5 Calibration (CAL) sub-function............................................................. 23

8 TECHNICAL SPECIFICATIONS................................................................... 24

9 ACCESSORIES ............................................................................................... 25

10 GENERAL INFORMATION....................................................................... 25

10.1 Warranty.................................................................................................. 25

10.2 Packaging ............................................................................................... 25

10.3 Return of Goods..................................................................................... 26

10.4 Guidelines for Returning Unit for Repair ............................................ 26

11 APPENDICES.............................................................................................. 27

11.1 Appendix 1.............................................................................................. 27

11.2 Appendix 2.............................................................................................. 28

11.3 Appendix 3.............................................................................................. 29

C) sub-function ......................................... 15

1 INTRODUCTION

1.1 Description of Unit

Thank you for purchasing Eutech’s ¼ DIN alpha-800 series pH/ORP process controllers. This unit is used for measuring either pH or ORP parameter one at a time, and the oper atio nal m ode is switc hab le fr om the menu. You can use this unit to measure pH or ORP with limit control. This controller has many user-friendly and safety features which include:

• Menu-driven program that simplifies set-up

• Built-in non-volatile memory backup to ensure that calibr ation 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 comp ensation 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 operation

• 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

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

• LED indicators signal control activities to monitor controller status

from a distance

• Protection against electromagnetic interference – Input and

output are free from external inference

1.2 Applications

Use this controller in panel mounted enc losures for applica tions such as water treatment and monitoring, galvanic-decontamination, chemical processing food processing, clean or waste water control and

neutralisation process

2 ASSEMBLY AND INSTALLATIONS

(

)

(

)

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 pr ocess assembly with or without a potential matching pin (PMP)

• a final control element such as pump or valve

• a recorder

Flow Assemb

Measurement Cable

H Contr oller

Power Mains

Chart Record

2.2 Unit Dimensions

max. 175

1mm

max. 45

Flat Gasket

To be Inserted ByCustome

Note: The Taped Corners Have to Be On Top

92 + 0.5

MountingCut-Out

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

3 ELECTRICAL CONNECTIONS

3.1 Connection Diagram

S/S/

AC:

er Mains

18 19 20 21 22

Pt 100

Relay A

* ) indicated contact positionsare for currentlessc onditions

PE/S

Potential M atching Pin (PMP)

RelayB

78 9

SignalInput pH/ORP

BNC

12 13

Signal OutputHold Input

151715

PE/S

PENL

Temp.

0/PA

123

19 18

BNC

Symmetrical high-impedance

connections

Measuring Cable

Potential

Matching Pin (PM)

123

Potential

Matching Pin (PM)

0/PA

pH Combination

Electrode

Tem p .

19 18

BNC

Asymmetrical connections

Measuring Cable

pH Combination

Electrode

3.2 Back Panel

The back panel consists of two conn ectors . The f irs t connector is the 17-wa y 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.No connection

2.AC mains neutral wire 11.No connection

3.AC mains protective earth wire 12.No connection

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) 16.4 - 20 mA for -ve connection

8.High set relay common 17.4 - 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 s electable via an internal jum per. Fac tory def ault is Pt1 00. See Appendix 1 for directions on switching the RTD type.

21. pH/ORP (potential matching pin)

21. pH/ORP (shield)

Pt100

Pt1000

0V PAL

FUSE 250VAC

(F)

100mA

LNPE

RELAY A

RELAY B

NC NCNC

HOLD

+ 23 hidden pages