Eutech instruments ALPHA PH 2000D PH User Manual

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Instruction Manual

αlpha-pH2000D

pH and ORP Controller/Transmitter

Technolo

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68X216855 Rev 1 12/04

Preface

This manual serves to explain the use of the αlpha-pH2000D 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-pH2000D 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.

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

Copyright ©2004 All rights reserved.
Eutech Instruments Pte Ltd.
Rev 1 12/04

Safety Information

The 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.

The degree of protection against electric shock will be achieved only by observance of the
corresponding installation rules.

TABLE OF CONTENTS

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

1.1 AT THE VERY BEGINNING...................................................................................................................... 1

1.2 INTENDED USE ...................................................................................................................................... 1

1.3 SAFETY INSTRUCTIONS ......................................................................................................................... 2

1.4 PUTTING OUT OF SERVICE / CORRECT DISPOSAL OF THE UNIT............................................................... 2

2 PRODUCT DESCRIPTION....................................................................................................................... 3

2.1 DESCRIPTION OF UNIT........................................................................................................................... 3

2.2 MEASUREMENT AND CONTROL SYSTEM................................................................................................ 4

2.3 UNIT OVERVIEW ................................................................................................................................... 5

2.3.1 Display Overview............................................................................................................................ 6

2.3.2 Key functions...................................................................................................................................6

2.3.3 LED indicators................................................................................................................................ 7

2.3.4 Security codes.................................................................................................................................. 7

2.3.5 Menu overview................................................................................................................................ 8

3 ASSEMBLY AND INSTALLATION........................................................................................................9

3.1 MOUNTING THE UNIT ............................................................................................................................ 9

3.2 CONNECTION DIAGRAM...................................................................................................................... 10

4 NORMAL OPERATION.......................................................................................................................... 12

4.1 MEASUREMENT MODE........................................................................................................................ 12

5 CALIBRATION MODE........................................................................................................................... 13

5.1 ENTERING CALIBRATION MODE .......................................................................................................... 13

5.2 PH CALIBRATION................................................................................................................................14

5.3 ORP-MV CALIBRATION...................................................................................................................... 16

5.4 ORP -% CALIBRATION ....................................................................................................................... 16

5.5 VIEW ACTUAL ZERO AND SLOPE.......................................................................................................... 17

6 SETUP MODE........................................................................................................................................... 18

6.1 ENTER SETUP MODE............................................................................................................................ 18

6.2 ELECTRODE OFFSET (OFS) SUB-FUNCTION ........................................................................................ 19

6.3 SETTING TEMPERATURE (SET °C°F) SUB-FUNCTION ........................................................................... 20

6.4 CONTROL RELAY A / RELAY B (SP1/SP2) SUB-FUNCTION ................................................................. 21

6.5 CONTROLLER (CNTR) SUB-FUNCTION ............................................................................................... 23

6.6 CURRENT OUTPUT 1 SUB-FUNCTION ................................................................................................... 26

6.7 CURRENT OUTPUT 2 SUB-FUNCTION ................................................................................................... 27

6.8 WASH RELAY (WASH) SUB-FUNCTION .............................................................................................. 28

6.9 CONFIGURATION (CNFG) SUB-FUNCTION .......................................................................................... 29

6.10 CALIBRATION (CAL) SUB-FUNCTION.................................................................................................. 30

7 RELAY MODES ....................................................................................................................................... 31

7.1 VIEW RELAY SET POINTS..................................................................................................................... 31

7.2 MANUAL RELAY MODE ....................................................................................................................... 32

8 TECHNICAL SPECIFICATIONS.......................................................................................................... 33

8.1 GENERAL SPECIFICATION ................................................................................................................... 33

8.2 SET-POINT AND CONTROL FUNCTION – RELAY 1 & RELAY 2.............................................................. 33

8.3 WASH FUNCTION – WASH RELAY ...................................................................................................... 34

8.4 ALARM FUNCTION – ALARM RELAY .................................................................................................. 34

8.5 TRANSMITTER FUNCTION ................................................................................................................... 34

8.6 VOLTAGE OUTPUT & HOLD FUNCTION SWITCH ................................................................................. 34

8.7 DISPLAY ............................................................................................................................................. 35

8.8 POWER SUPPLY...................................................................................................................................35

8.9 ELECTRICAL DATA AND CONNECTIONS .............................................................................................. 35

8.10 MECHANICAL SPECIFICATIONS ........................................................................................................... 35

8.11 ELECTROMAGNETIC COMPLIANCE (EMC) SPECIFICATIONS ............................................................... 35

8.12 ENVIRONMENTAL CONDITIONS........................................................................................................... 35

9 ACCESSORIES......................................................................................................................................... 36

9.1 REPLACEMENT UNIT........................................................................................................................... 36

9.2 ASSEMBLY ACCESSORIES ................................................................................................................... 36

10 GENERAL INFORMATION................................................................................................................... 37

10.1 WARRANTY........................................................................................................................................ 37

10.2 PACKAGING / SCOPE OF DELIVERY...................................................................................................... 37

10.3 RETURN OF GOODS.............................................................................................................................. 37

10.4 GUIDELINES FOR RETURNING UNIT FOR REPAIR .................................................................................. 37

10.5 MAINTENANCE AND CLEANING.......................................................................................................... 37

11 APPENDICES ........................................................................................................................................... 38

11.1 APPENDIX 1 – UNIT FUSE AND JUMPER SETTINGS................................................................................ 38

11.2 APPENDIX 2 – PH BUFFER VALUES AT VARIOUS TEMPERATURES ........................................................ 39

11.3 APPENDIX 3 – SIMPLE EXPLANATION ON THE FUNCTION OF HYSTERESIS ............................................ 40

11.4 APPENDIX 4 – GENERAL INSTRUCTIONS CONCERNING CONTROLLER SETTING ................................... 41

11.4.1 Control characteristic of Controllers used as limit value switch ............................................. 41

11.4.2 Control characteristic of P-Controllers as proportional controller......................................... 41

11.4.3 Control characteristic of PI-Controllers as proportional integral controller.......................... 41

11.4.4 Control signal of Pulse length Controllers............................................................................... 42

11.4.5 Control signal of Pulse Frequency Controllers........................................................................ 43

11.5 APPENDIX 5 – ABBREVIATIONS USED IN MENU DISPLAYS................................................................... 44

Instruction Manual αlpha-pH2000D

1 INTRODUCTION

1.1 At the very beginning

We thank you for having purchased the αlpha pH 2000D pH/ORP Controller.
The construction of the pH/ORP Controller 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 pH/ORP Transmitter.

This instruction manual identifies safety instructions and additional information by means of
the following symbols:

This symbol draws attention to safety instructions and warnings of
potential danger which, if neglected, could result in injury to persons
and/or damage to property.

This symbol identifies additional information and instructions which, if
neglected, could lead to inefficient operation and possible loss of
production.

The instruction manual must always be stored close at hand, in a place accessible to all
people working with the pH/ORP Controller.

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 us e

The αlpha pH 2000D pH/ORP Controllers are intended solely for pH or ORP 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:
– observing the instructions, notes and requirements set out in this instruction manual.
– observing all local safety regulations concerning safety at work.
– observing all information and warnings in the documentation dealing with the products

used together with the transmitter (housings, sensors, etc.).

– observing the prescribed environmental and operational conditions.

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Instruction Manual αlpha-pH2000D

1.3 Safety instructions

- The αlpha pH 2000D should be installed and operated only by personnel familiar
with the transmitter and who are qualified for such work.

- A defective controller must neither be installed nor put into service.

- The αlpha pH 2000D must only be operated under the specified operating
conditions (see section 8).

- The αlpha pH 2000D must not be repaired by the customer.

- The αlpha pH 2000D must only be opened to replace the unit fuse. This work must
be carried out only by personnel familiar with the transmitter and who are
qualified for such work. Make sure the mains cable is separated from the power
supply before opening the unit.

- No modifications to the αlpha pH 2000D are allowed. The manufacturer/supplier
accepts no responsibility for damage caused by unauthorized modifications. The
risk is borne entirely by the user.

1.4 Putting out of service / Correct disposal of the unit

Putting out of service

• First disconnect the unit from the mains, then undo all electrical connections.

• Remove the unit from the wall / panel.

Correct disposal of the unit

When the transmitter is finally taken out of service, observe the local environmental
regulations for correct disposal or send the transmitter to your local distributor, they will take
care of proper disposal.

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Instruction Manual αlpha-pH2000D

2 PRODUCT DESCRIPTION

2.1 Description of unit

The αlpha pH 2000D is used for measuring pH and temperature values. The pH values can be
measured using industrial differential & combination pH sensors. The temperature values can
be measured using 2-wire / 3-wire NTC300 thermistor. The transmitter is available in a wall
mounting enclosure. The controller / 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.

This transmitter has many user-friendly and safety features which include:

• Push-button for calibration and sensor offset adjustment from the keypad.

• Built-in non-volatile memory to ensure that calibration and other information are not

erased if power supply fails.

• Menu-driven program that simplifies set-up.

• Automatic temperature compensation (ATC).

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

setting for calibration and process temperature.

• Two galvanically isolated current outputs 0/4...20mA.

• Two switching contacts as set-point relays.

• 0 to 2000 seconds time delay adjustment on all relays – minimizes false alarms.

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

of relays around the set points.

• Three control modes: limit controller, P controller and PI controller (P/PI controller as
pulse length or pulse frequency).

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

• Separate alarm relay alerting you to set point limits exceeded for a certain time and if the
NTC300 thermistor wires are broken or disconnected during the ATC function.

• Wash relay.

• Hold function to freeze output current (0/4...20mA) and release control relays.

• LED indicators signal control activities to visually monitor transmitter status from a

distance.

• Protection against electromagnetic interference.

• Back lit and UV light protected LC display.

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Instruction Manual αlpha-pH2000D

2.2 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 NTC300

thermistor.

• An appropriate pH or ORP measurement cable

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

• A final control element such as pump or valve

• A chart recorder

αlpha pH 2000D Transmitter

Chart Recorder

Housing and
Sensors

Measurement Cable

0/4 - 20 mA

Power Mains
(80 - 250 VAC)

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Instruction Manual αlpha-pH2000D

2.3 Unit overview

Wall mounting version

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Instruction Manual αlpha-pH2000D

A

2.3.1 Display Overview

The LC display shows two alpha-numerical fields for parameters and measured values as well
as various mode and status indicators.

SETUP

MEAS

CAL

READY

HOLD

ERR

2.3.2 Key functions

Key Description

O

pH

pH %

C

TC

mV

Mode indicators:
MEAS: measurement mode
SETUP: Set-up mode
CAL: Calibration mode

O

F

Status indicator:
READY: Visible after successful calibration
HOLD: Unit in “HOLD” mode
ATC: Visible in ATC (Automatic Temperature

Compensation) mode. Not visible in the Manual
Temperature Compensation mode. “ATC”
flashes if the temperature probe is faulty in its
ATC mode

ERR: Error indicator
S: Visible in symmetrical measurement mode

Enter Calibration mode (requires access code)

Enter Set-up mode (requires access code)
Access sub functions (parameters) within a function group of Set-up mode
Confirm (store) set-up parameters and numerical values
Start/Confirm calibration in Calibration mode.
Select function group in the Set-up mode.
Set parameters and numerical values (if key is pressed continuously, the setting speed

increases).
Control the relays in MANUAL relay operation.
Returns to “Measurement mode” when both keys are pressed simultaneously.
Display limit values for SP1 and SP2 and settings for wash contact in AUTO relay

operation.
Toggle between RELAY A, RELAY B or Wash relay in MANUAL relay operation

Switch from AUTO to MANUAL relay operation (requires access code)

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Instruction Manual αlpha-pH2000D

2.3.3 LED indicators

Relay indicators

If REL key is pressed the LED (A, B or W) indicates to which Relay (A, B or
Wash) the displayed limit values refer.

Relay mode indicators

Auto LED lights if relay operation is set to automatic mode. Manu LED lights
if relay operation is set to manual mode.

Relay status indicators

This LED lights if limit value is exceeded or the ATC probe fails.

2.3.4 Security codes

The access to Calibration mode, Setup mode and Manual relay operation mode is protected
with security codes. The security codes are set at the factory and cannot be changed by the
user. The following security codes are used:

Security code Mode Description

000 View only mode to view actual settings

This LED lights green if measured value is within the limit for Relay A or
lights red if measured value exceeds limit.

This LED lights green if measured value is within the limit for Relay B or
lights red if measured value exceeds limit.

This LED lights if cleaning cycle is on.

11 Calibration mode to start calibration

22 Setup mode to configure parameters

22

- 7 -

Manual relay operation to switch relay operation mode from
automatic to manual

Instruction Manual αlpha-pH2000D

2.3.5 Menu overview

MEAS

CAL

H

P

°C

ENTER

ENT

CCD “000” = Check calibration parameters (View only mode)

1

CCD “11” = Calibration mode
SCD “000” = Check setup parameters (View only mode)

2

SCD “22” = Setup mode

ENTER

ENT

ENTER

ENT

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

OFS

ENT

ENT

ENT

ENT

ENT

ENT

ENT

Offset setting

see section 6.2

Temperature settings

see section 6.3

Relay A (set point 1) settings

see section 6.4

Relay B (set point 2) settings

see section 6.4

Controller settings

see section 6.5

Current output 1 settings

see section 6.6

Current output 2 settings

see section 6.7

SETUP

HOLD

ENT

Wash contact settings

see section 6.8

SETUP

HOLD

SETUP

HOLD

ENT

ENT

Unit settings

see section 6.9

Calibration

see section 5

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Instruction Manual αlpha-pH2000D

3 ASSEMBLY AND INSTALLATION

3.1 Mounting the unit

Wall mounting version

144 [5.67]

144 [5.67]

111.50 [4.39]

27.5 [1.08]

approx. 14 [.55]

21.5 [.85]

66.5 [2.62]

6 [.24]

Max.80

39 [1.54]
78 [3.07]

80 [3.15]

90 [3.54]

84 [3.30]

1-22 [0.03 - 0.87]

Pg13.5 (3 pcs.)

29 [1.14]

Holes for post
mounting (4X)

Holes for wall
mounting (2X)

90 [3.54]

Red Plugs for wall
mounting holes
enclosure (2X)

24 [.94]

For Pg13.5 cable glands

57.8[2.28]

175 [6.88]

Seal gasket

Threaded rod for pane l mounting

Unit:
MM [INCH]

138 [5.43]

138 [5.43]

Cut-out mounting plates for post mounting

175 [6.88]

Transmitter housing for wall mounting: protection class IP 65

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Instruction Manual αlpha-pH2000D

3.2 Connection Diagram

Caution: Ensure electrical mains are disconnected before proceeding.

Connections for wall mounting version

Fuse: 250V 315 mA,

Time Delay

Curren t

250V, 315 mA,
Time Delay

Curren t

OP2

OP1

HOLD

13

14215

17

16

21

18 19 20422 23

1

3

L

N

TEMP

pH

pH

TEMP

SENS

AS

-5V

REF

ME

28

26 27

31

29930

24

25

6 7

5

32 33

12

10

8

11

13

OP2

14

Current

OP1

15

2

N

MP

HOLD

17

16

18 19 2120 23 24 25

3

22

4

6

5

7

V

-5

8 9

TE
SENS TEMP

2926 2827 30 31 32 33

pH

RE

AS

FpHME

10

12

11

Current

1

L

-5V

1. AC mains live wire 18. 12V output Power supply

2. AC mains neutral wire 19. Hold Function

3. AC mains protective earth wire 20. Hold Function

4. Relay A (SP 1) 21. Earth ground

5. Relay A (SP 1) 22. no connection

6. Relay B (SP 2) 23. no connection

7. Relay B (SP 2) 24. no connection

8. Wash relay 25. no connection

9. Wash relay 26. Shield (drain wire)

10. Alarm relay (NC) 27. -5V to differential pH sensor (White wire)

11. Alarm relay common 28. Temperature ground (black wire)

12. Alarm relay (NO) 29. Temperature Sense (Yellow wire)

13. 4-20 mA temperature output, +ve terminal 30. Temperature Input (Yellow wire)

14. 4-20 mA temperature output, -ve terminal (Internally connected by jumper to terminal 29)

15. 4-20 mA pH/ORP output, +ve terminal 31. No connection

16. 4-20 mA pH/ORP output, -ve terminal 32. pH input, Reference (Green wire)

17. 12V output ground 33. pH input, Measure (Red wire)
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 (10 & 11).

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