Thermo Fisher Scientific pH 1000 User Manual

Alpha pH/ORP 1000

Process Controller/Transmitter

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Preface

This manual serves to explain the use of the Alpha pH1000 pH/ORP process 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 ref erence guide. This instruction manual is written to cover as many anticipated applications of the Alpha pH1000 pH/ORP process controller/transmitter. If you have doubts in the use of the instrument, please do no t hesitate to co ntact the nearest Authorized Distributor.

Thermo Scientific will not accept any responsibility for damage or malfunction of the unit due to improper use of the instrument.

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 Thermo Scien tific.

2009

Safety Information

The Controller/ Transmitter shall be installed and operated only in the manner specified in this Instruction ma nual. 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 is connected to it as specified on the top label. Failure to do so may result in permanent damage of the unit.

The unit has live and exposed parts inside. If it has to be opened, make sure that 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 INSTALLATIONS ____________________________________ 2

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

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

3 ELECTRICAL CONNECTIONS ________________________________________ 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____________________________________________________ 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

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

7.4 Controller (Cntr) sub-function.........................................................................18

7.5 Current Output (mg) sub-function .................................................................. 20

7.6 Configuration (ConF) sub-function.................................................................21

7.7 Calibration (CAL) sub-function....................................................................... 24

C) sub-function ...... ... ... ... ...................................... 14

8 ADVANCED SET UP 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

1 INTRODUCTION

1.1 Description of Unit

Thank you for purchasing the ¼ DIN Alpha pH1000 pH/ORP process controller/transmitter. 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 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 calibration and other information

are not erased if power supply fails

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

• Automatic temperature compensation (ATC)

• Manual temperature compen sation setting without the ATC probe, with independent

setting for calibration and pr ocess 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 operati o n

• 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 tr iggering relays

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

• When set to work as Alarm relay, alerts you when readings exceed set-point limits after

a set time buffer, 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 datalo

• Choice of 7 buffers from USA or NIST standards

gging 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 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 process assembly with or without a potential matching pin (PMP)

• a final control element such as pump or valve

• a recorder

• an appropriate pH or ORP measurement cable

Flow Assembly

PH Controller

Chart Recorder

Process Assembly

with Electrode

Measurement Cable

Power Mains

(220/110 VAC)

2.2 Unit Dimensions

Flat Gasket (1mm)

(To be Inserted By Customer)

Note: The Taped Corners Have to Be On Top

92 + 0.5

Mounting Cut-Out

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

max. 45

max. 175

3 ELECTRICAL CONNECTIONS

3.1 Connection Diagram

ENSURE electrical mains is disconnected before proceeding.

S/S/

AC:

Power Mains

18 19 20

Pt 100

Relay A

21 22

PE/S

Potential Matching Pin (PMP)

Relay B

78 9

Signal Input pH/ORP

Alarm

BNC

12 13

PE/S

151715

Signal OutputHold Input

*)indicated contact positions are for currentless conditions

NLS

Potential

Matching Pin (PMP)

NLS

Potential

Matching Pin (PMP)

0 / PA

0 / P A

Temp.

19 18

Temp.

19 18

Measuring Cable

pH Combination

Electrode

Measuring Cable

pH Combination

Electrode

BNC

Symmetrical high-impedanc e connections

Asymmetrical connect ions

3.2 Back Panel

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. 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 selectable via an internal jumper. Factory default is Pt100. See Appendix 1 for directions on switching the R TD type.

21. pH/ORP (potential matching pin)

22. pH/ORP (shield)

pH/mV

FUSE 250V AC

(F)

100mA

RELAY A

Pt100/

Pt1000

RELAYB

0V/

PAL

LARM / WASH

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 (11 and 12). In the Wash mode, the relay works on a positive mode. Therefore, the Wash device should be connected to contacts 10 and 11.

4 OVERVIEW

4.1 Keypad and Display

4.1.1 Keypad

• Perform rapid 2-point ca l ibration

• 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

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

• Switch beween AUTO and MANUAL relay operation mode

• 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.

• MEAS: Measurement mode

• SETUP: Set-up mode of function groups

• CAL: Calibration mode of pH/ORP and temperature

• READY: Comes on after a succe ssful calibrat ion

• 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

READY HOLD

7.00

ERR

25.0

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

CONMEAS CALSET UP

°C AT C

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.

4.2 Function Groups

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

1) Offset adjustment (OFS)

2) Temperature Measurement / compensation settings (Set

3) Control relay 1 configuration (SP1)

4) Control relay 2 configuration (SP2)

5) Control type (Cntr)

6) Current output (mg)

7) Configuration (ConF)

8) Calibration (CAL pH)

SETUP

HOLD

SETUP

HOLD

OFS

Cal

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

SETUP

HOLD

Sp1 Sp2

SETUP

HOLD

SETUP

HOLD

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:

SETUP HOLD

000

S.Cd

a) 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).

b) Press ENTER key again. This allows you to only view (not

change) any sub-functions’ settings.

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

c) d)

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

Press the ENTER key to return to the sub-function menu. Press the ▲ or ▼ keys simultaneously (as an Escape key) at any time to return to the

Measurement mode.

Note: To simplify operations, the controller will not display parameters that are not relevant to a particular subfunction. For example, if the user set the controller for limit control, it will not display pulse length/frequency settings.

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

MEASUREMENT

RANGE

CONFIGURATION

CALIBRATION

Set Offset

Switch On/Off ATC

Set value 1

Set value 2

Controller type

Current output

0.20 / 4.0 mA

pH/ ORP Symm.

/ Asymmetrical

Calibrate 1st value

Process temp.

(MTC)

MIN / MAX Function

N.O. / N.C.

Contact

pH / ORP at 0/4 mA

Alr

Cln

Calibrate

2nd value

Calib. temp.

(MTC)

Hysteresis 1

Hysteresis 2

Proportional

range XP

Alarm delay

Display zero point

and slope

Calibrate Pt100

Pick-up delay

contact 1

Pick-up delay

contact 2

Cycle time bzw.

Max. Frequency

Alarm contact

cont./wiper contact

1000

Dur

Dropout delay

contact 1

Dropout delay

contact 2

Electrode type

Glass/Antimony

Reset to factory

default settings

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 no key is pressed for 30 seconds.

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