Eutech instruments ALPHA -pH2000 Manual

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Instruction Manual

α lpha-pH2000

pH and ORP Controller/Transmitter

Technology Made Easy ...

68X216830 rev0 06/02

Preface

This manual serves to explain the use of the α lpha-pH2000 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 α lpha-pH2000 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.

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.

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

TABLE OF CONTENTS

1 INTRODUCTION		6

1.1	At the very beginning	6
1.2	Intended use	6
1.3	Safety intsructions	7

2 PRODUCT DESCRIPTION		8

2.1	Description of unit	8
2.2	Measurement and Control System	9
2.3	Unit Overview	10


3		ASSEMBLY AND INSTALLATION		14
	3.1		Mounting the unit	14
	3.2		Connection Diagram	15
4		NORMAL OPERATION		16
5		CALIBRATION MODE		17
	5.1		Entering Calibration mode	17
	5.2		pH Calibration	18
	5.3		ORP–mV Calibration	20
	5.4		ORP -% Calibration	21
	5.5		View actual zero and slope	22
6		SET-UP MODE		23
	6.1		Enter Setup mode	23
	6.2		Electrode Offset (OFS) sub-function	24
	6.3		Setting temperature (Set oC) sub-function	25
	6.4		Control Relay A/Control Relay B (SP1/SP2) sub-function	26
	6.5		Controller (CNTR) sub-function	28
	6.6		Current Output 1 sub-function	31
	6.7		Current Output 2 sub-function	32
	6.8		Wash relay (WASH) sub-function	33
	6.9		Configuration (CNFG) sub-function	34
	6.10		Calibration (CAL) sub-function	36
7		RELAY MODES		37
	7.1		View relay set points	37
	7.2		Manual relay mode	38
8		TECHNICAL SPECIFICATIONS		39
9		ACCESSORIES		40

10 GENERAL INFORMATION		41

10.1	Warranty	41
10.2	Packaging	41
10.3	Return of Goods	41
10.4	Guidelines for Returning Unit for Repair	41

11 APPENDICES			42

11.1	Appendix 1 – Pt 100 / Pt 1000 selection		42
11.2	Appendix 2	– pH buffer values at various temperatures	43
11.3	Appendix 3	- Hysteresis	44
11.4	Appendix 4	– Control actions	45
11.5	Appendix 5 – Abbreviations used in menu displays		47

1 INTRODUCTION

1.1At the very beginning

We thank you for having purchased the Eutech Instruments alpha pH 2000 pH/ORP Controller.

The construction of the pH/ORP Transmitter 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 Transmitter.

If you have questions, which are not or insufficiently answered in this instruction manual, please contact your Eutech Instruments supplier. They will be glad to assist you.

1.2Intended use

Eutech Instruments alpha pH 2000 pH/ORP Transmitters 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.

1.3Safety instructions

The pH/ORP Transmitter should be installed and operated only by personnel familiar with the transmitter and who are qualified for such work.

A defective transmitter must neither be installed nor put into service.

The pH/ORP Transmitter must only be operated under the specified operating conditions (see section 8).

The pH/ORP Transmitter must not be opened nor repaired by the customer.

No modifications to the pH/ORP Transmitter are allowed. The manufacturer/supplier accepts no responsibility for damage caused by unauthorised modifications. The risk is borne entirely by the user.

2 PRODUCT DESCRIPTION

2.1Description of unit

The Eutech pH/ORP Transmitter is used for measuring pH or ORP and temperature values. The pH or ORP values can be measured using proportional or limit control.

The transmitter is available in two versions, one for panel mounting and one for wall mounting in an enclosure. The 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:

•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 for 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.

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

•0 to 1999 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.

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

•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.

•Two switching contacts as set-point relays.

•Separate alarm relay alerting you to set point limits exceeded for a certain time and if the Pt100/Pt1000 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 lighted and UV light protected LC display

2.2 Measurement and Control System

A typical measurement system consists of:

•a pH/ORP process transmitter

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

•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

Flow Assembly

pH Controller

Chart Recorder

Power Mains

Process Assembly

Measurement Cable

(220/110 VAC)

with Electrode

2.3 Unit Overview

Wall mounting version

2.3.1Display 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	mv
SETUP MEAS	CAL	PH%
ready		PH%
HOLD
err
		OCOf
		ph
s		atc
s

Mode indicators:

–MEAS: Measurement mode

–SETUP: Set-up mode

–CAL: Calibration mode

Status indicators:

–READY: Visible after successful calibration

–HOLD: Relay position and current output are frozen

–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 or alarm indicator

–S: Visible in symmetrical measurement mode

2.3.2Key functions

Key

CAL

Description

• 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 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)

2.3.3LED indicators

Relay indicators

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

Relay mode indicators

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

Man Man LED lights if relay operation is set to manual mode.

Relay status indicators

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

Rel A: LED lights green if measured value is within limit for Relay A

LED lights red if measured value exceeds limit for Relay A

Rel B: LED lights green if measured value is within limit for Relay B

LED lights red if measured value exceeds limit for Relay B

Rel W: LED lights if cleaning cycle is on.

2.3.4Security 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

11	Calibration mode to start calibration
22	Setup mode to configure parameters
22	Manual relay operation to switch relay operation mode from
	automatic to manual

2.3.5Menu overview

MEAS
P H
C
	
*	**
 	 

*CCD “000”= Check calibration parameters (View only mode) CCD “11” = Calibration

**SCD “000” = Check setup parameters (View only mode) SCD “ 22” = Setup mode

SETUP

 

HOLD

SETUP			Temperature settings
HOLD			Temperature settings
			see section 6.3

SETUP
HOLD		
SETUP		
HOLD		
HOLD
SETUP
HOLD		

SETUP

HOLDcur.1  

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

SETUP
HOLDcur.2			Current output 2 settings
			see section 6.7
SETUP			Wash contact settings
HOLD			Wash contact settings
			see section 6.8

SETUP		Unit settings
HOLD	 	Unit settings
		see section 6.9

SETUP			Calibration
HOLD			Calibration
			see section 5

3 ASSEMBLY AND INSTALLATION

3.1Mounting the unit

	108.50
144	27.50

144

14
approx.	78	PG13.5 (3 pcs.)
	39

21.13

42.36

32	80
	Holes for panel
	mounting (4X)
72	Holes for wall
	mounting (2X)
	90
6

3.2Connection Diagram

Caution: Ensure electrical mains is disconnected before proceeding. The back panel consists of three connectors.

pH/ mV

							PT100/					RE LA		RELB	WASH RE LAY		ALAR M R ELAY
							PT100/
							PT1000
											12	11	10	9	8	7	4	5	6
29	28	31	30	20	19	22	24	25	26	27	14	13				3		2	1

+- + -

Current	Current GND +12V	E	LIQ	HOLD	E	N L
OP 2	OP1		GND

1.	AC mains live wire	17. no connection
2.	AC mains neutral wire	18. no connection
3.	AC mains protective earth wire	19.	12V Power supply
4.	Alarm relay working position (NC)	20.	12V ground
5.	Alarm relay common	21. no connection
6.	Alarm relay resting position (NO)	22.	Earth ground
7.	Wash relay	23. no connection
8.	Wash relay	24.	Temperature ground
9.	Relay B (SP 2)	25.	Temperature input
10.	Relay B (SP 2)	26.	Temperature sense (short to terminal 25 if using 2-
11.	Relay A (SP 1)		wire RTD
12.	Relay A (SP 1)	27.	PMP, liquid ground in symmetrical mode
13.	Hold function	28.	4-20 mA temperature output, -ve terminal
14.	Hold function	29.	4-20 mA temperature output, +ve terminal
15. no connection		30.	4-20 mA pH output, -ve terminal
16. no connection		31.	4-20 mA pH output, +ve terminal

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 (4 & 5).

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