Omega PHCN-961 User guide

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User’s Guide

PHCN-961

pH/ORP Controller

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MADE IN TAIWAN

Servicing North America:

U.S.A.: OMEGA Engineering, Inc.

ISO 9001 Certified

One Omega Drive
P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Canada: 976 Bergar

Laval (Quebec), H7L 5A1 Canada
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378 /1-800-622-BEST

®

Engineering Service: 1-800-872-9436/1-800-USA-WHEN

®

Mexico/ En Español: 001 [phone] FAX: [phone]
Latin America [email protected] e-mail: [email protected]

Servicing Europe:

Benelux: Managed by the United Kingdom Office

Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

France: Managed by the United Kingdom Office

Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Germany/Austria: Daimlerstrasse 26

D-75392 Deckenpfronn, Germany
Toll-Free: 0800 6397678 TEL: [phone]
FAX: [phone] e-mail: [email protected]

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified

One Omega Drive, River Bend Technology Centre, Northbank
Irlam, Manchester M44 5BD United Kingdom
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [email protected]

OMEGAnet®Online Service Internet e-mail

omega.com [email protected]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

3

Preface -

This manual serves to explain the use of PHCN-961 series controller / transmitter. This

instruction manual is written to cover as many anticipated applications of PHCN-961 series
controller / transmitter.

The information presented in this manual is subject to change without notice as

improvements are made, and does not represent a commitment of part of

ENGINEERING

.

OMEGA

OMEGA ENGINEERING. can not accept any responsibility for damage or

malfunction of the unit due to improper use of the instrument..

Copyright2011 OMEGA ENGINEERING, All right reserved.

_______________________________________

4

SAFETY INFORMATION

OMEGA ENGINEERING. 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 is connected to,
is as specified in the top label. Failure to do so may result in a permanent
damage to the unit.

Proteet level against electric shock mainly depends on relevan installation
rules.

5

TABLE OF CONTENTS

1 PREFACE 7

BEFORE USE 7
IN USE 7
SAFETY INSTRUCTION 8

2 PRODUCT DESCRIPTION 9

2.1 DESCRIPTION OF INSTRUMENT SPECIALITY: 9

2.2 MEASUREMENT AND CONTROL SYSTEM 10

2.3 APPEARANCE 11

2.3.1 INTRODUCTION OF DISPLAY 12

2.3.2 KEY INSTRUCTION 13

2.3.3 LED INDUCTION 13

2.3.4 PASSWORD 13

2.3.5 PREVIEW OF FUNCTION 14

3 INSTALLATION AND ACCESSORY 15

INSTALLATION 15
PHCN-961 CONNECTION DIAGRAM 16
MEASUREMENT MODE 17

4 CALIBRATION MODE 18

4.1 ENTERING CALIBRATION MODE 18

4.2 pH CALIBRATION 19

4.3 ORP–mV CALIBRATION 22

5 SET UP MODE 23

ENTERING SET UP MODE 23

5.1 P01_TEMPERATURE SET-UP SUB-FUNCTION 24

5.2 P02_OFFSET SET-UP SUB-FUNCTION 25

5.3 P03: OUTPUT ELECTRIC CIRCUIT_SP1/SP2_ SUB-FUNCTION 26

5.4 P04_CONTROL MODE SUB-FUNCTION 27

5.5 P05_RELAY 1 SET-UP SUB-FUNCTION 28

5.6 P06_RELAY 2 SET-UP SUB-FUNCTION 29

5.7 P07_ALARM RELAY 3 SET-UP SUB-FUNCTION 30

5.8 P08_pH/ORP AND SENSOR CONFIGURATION SUB-FUNCTION 31

_______________________________________

6

5.9 P09_TRANSMITTING RATE SUB FUNCTION 32

5.10 P10_REVERTING TO FACTORY DEFAULT SETTINGS 33

5.11 COMMUNICATION PROTOCOL 34

6 TECHNICAL PARAMETERS 38

6.1 TECHNICAL PARAMETERS FORM 38

6.2 PARAMETER SETTING AND FACTORY PRELIMINARY VALUE 39
APPENCLIX 2 – pH TEMPERATURE CORRESPONDING TO pH BUFFER SOLUTION 40
APPENCLIX 3 – HYSTERESIS BAND 41
APPENCLIX 4 – CONTROL MOVEMENT 42
ACCESSORY 5 – ABBREVIATIONS IN FUNCTION FORM 44

7

1 PREFACE

BEFORE USE

Thank you for using OMEGA ENGINEERING. PHCN-961 series controllers and

transmitters.

Although this series of pH/OPR controllers / transmitters use advanced technology and meet
the requirements of current safety rules, improper use can also threaten the safety of users, and / or
cause harmful influences to factory and other equipments. Therefore, before using pH/ORP
controllers / transmitters, a qualified person must read and understand contents of this instruction
manual.

Following symbols used in this instruction manual are to mark safety instruction

and appendix information:

This symbol means safety instructions and warning of potential danger. If

they are neglected, person may be harmed and property may be damaged.

This symbol means the contents are technical notes, limitations or
requirements. If they are neglected, it will cause low efficient and even losing
products.

Instruction manual should be kept accessible to the person who will use the use pH/ORP
controller/ transmitter.

If you have problems, which are not mentioned in this manual, please contact Omega
Engineering.

IN USE

OMEGA ENGINEERING. pH/ORP controllers / transmitters, as described instruction

manual, are intended to display pH or ORP and temperature measurement.
Any other uses, not mentioned in instruction manual, are not acceptable.

Other conditions of proper use include:

– Read and follow remarks and requirements stated in instruction manual.
– Follow local safety regulations for safe operation.
– Follow information and warning of products that are used together with

the transmitters. (Chassis, electrode, etc.)

– Follow all environmental and working condition requirements.

_______________________________________

8

SAFETY INSTRUCTION

pH / ORP transmitters should be installed and operated by qualified
person.

Transmitters with problems should not be installed and/or used.

pH / ORP transmitters should be used under acceptable working

conditions.

pH / ORP transmitters should not be open and repaired by clients them

selves.

Modified pH / ORP transmitters should not be used. Producers and
suppliers do not bear responsibility for the damage and lose caused by
modifying instruments without permission. Clients bear all the risks.

This instrument has a protection level of IP65. Use waterproof cable glands
when you connect the cable. Also, loosen the gland when you open the
cover. After connecting the line, please tighten the cable connector with
attached line tie, or it can cause damage when the cover is opened.

Please make sure to disconnect the power before you open the cover.

1. Cable glands

2. Cable (recommended stripping lengths for cables at least 90mm)

3. Cable ties

7

m

m

90

mm

1

2

3

9

2 PRODUCT DESCRIPTION

2.1 DESCRIPTION OF INSTRUMENT SPECIALITY:

OMEGA ENGINEERING. pH / ORP transmitters are used to measure pH or ORP

and temperature value.

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

• Menu-driven programs that are easy to set-up.

• IP65 enclosure.

• Built-in memory backup to ensure that setup parameter and calibration information are
not erased if power is lost.

• Can separately set process temperature (TST1) and Calibration temperature (TST2)
manually. If the temperature sensor fails, under automatic temperature compensation
mode, instrument will automatically switch to process temperature (TST1) of manual
temperature compensation to compensate.

• pH measured value can make offset adjustment (adjusting scope ±2PH) so that users can

calibrate online.

• Various choice of electric current output. 0/4-20mA Output range can be user
programmed.

• Two sets of relay contacts, users can choose high-low meta control independently.

• Separately adjustable high and low set point hysteresis (dead bands) prevent oscillating of
relays around the set points.

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

• Can set calibration time. Instrument will automatically appear “CAL” at regular time to
call person to alert that a calibration is needed.

• Glass electrode and Metal antimony electrode can be chosen and be used under different
industrial situations.

• During calibrating and setting, hold function freezes output current (0/4 20ma) and releases
control relays.

• Ultraviolet rays resistant, LCE of blue back light (LCD=liquid crystal display)

• RS-485. Maximum 100 instruments can be connected.

_______________________________________

10

2.2 MEASUREMENT AND CONTROL SYSTEM

Typical measurement system includes:

• pH/ORP on-line transmitter

• Intergral or separated temperature sensor (Pt1000).

• Suitable pH/ORP measurement electric cable.

• Immersion, flow or processing parts with or without grounding electrode.

• Terminating controlling parts, eg. Pump or value.

• 0/4~20mA can connect with recording instrument/data logger.

• RS485 can be used for multi-instrument communication.

+

11

2.3 APPEARANCE

PHCN-961 panel installation

_______________________________________

12

2.3.1 INTRODUCTION OF DISPLAY

Two liquid crystal regions show measured value and indication and parameters of various

status.

MEA

7.00

PH

SPI

ATC

250

O

C

SP2

CAL

SET

ERR

Mode Indication_
– MEA :

measurement mode

– SET : set-up mode
– CAL : calibration mode

Status Indication:
– HOLD :

relay actions and electric current output are

hold.

– ATC : automatic temperature compensation

indication, manual temperature compensation is not
displayed.

– ERR : error or warning indication
13

2.3.2 KEY INSTRUCTION

KEY

Description

•

Mode switch key or quit key

• Confirm key

•

Entering sub-function form of function group in setting mode

• Confirm setting parameter and value

• Starting calibrating in calibration mode

• Back light on and off switch in measurement mode

• Choose function group in setting mode

Set parameter and value

Hold down to change values quickly

2.3.3 LED Induction

Relay Induction

SP1\SP2 LED show relevant working status of relays.

SP1\SP2LED light-on shows that relays are on.

2.3.4 Password

When entering calibration mode and setting mode, there are passwords. Passwords are set by

factory and users can not modify them by themselves.

Password Mode / Instruction

028

Calibration Mode

058 Set-up Mode

_______________________________________

14

2.3.5 PREVIEW OF FUNCTION

MEA

7.00

PH

SPI

ATC

O

C

SP2

I2.00

25.0

XXX

HOLD

HOLDHOLD

HOLD

HOLD

HOLDHOLD

SPI

HOLD

Sp2

HOLD

HOLD

HOLD

HOLD

HOLD

HOLD

P02:OFFSET SETUP

P04:CONTROL MODE

P05:RELAY1 SETUP

P06:RELAY2 SETUP

P07:ALARM RELAY
SETUP

P08:

CONFIG SETUP

P09:RS-485 SETUP

P0:1 RESET SETUP

15

3 INSTALLATION AND ACCESSORY

INSTALLATION

Panel cutout:93.5 * 93.5mm

(panel installation)

1-7(0.03-0.27

136(5.35)

12(0.47)

108(4.25)

100(3.93)

93.5(3.68)

93.5(3.68)

_______________________________________

16

PHCN-961 connection diagram

Warning : Make sure to power off before connecting. The back
panel consists of three connectors.

PHCN-961 series connection diagram

NEW VERSION

1. pH value 4—20mA output, positive terminal

14. Alternating connect earth wire

2. pH value 4—20mA output, negative terminal

15. Electric source input 110V alternating current

3. 485A output

16. Electric source input 220V alternating current

4. 485B output

17. Relay A (SP1)

5. Y Connector REF terminal

18. Relay A (SP1)

6. Short circuit with 7 under normal status

19. Relay B (SP2)

7. COM, open circuit with 6 pin and connect PMP sensor
when display value unstable

20. Relay B (SP2)

8. Temperature electrode positive terminal (PT1000)

21. Clearing Relay (RL3)

9. Temperature electrode negative terminal (PT1000)

22. Clearing Relay (RL3)

10. Temperature electrode sensing terminal (2-wire
system, use short circuit between 8 and 9)

__pH/ORP input terminal

11. +5V

12. COM

13. Connect bigger earth wire

NOTE: Short circuit with 6 and 7 pin under normal status. Open circuit with 6 and 7 pin,
and connect PMP sensor when display value unstable.

17

SP1

SP2

12

N

13 14 15 16

11

10

09

08

07

06

05

04

03

02

01

mA

mA

pH-

COM

18

19

20

21

22

pH/ORP INPUT

REF

+5V

COM

NEW VERSION

485A

REF

485B

RL3

17

MEASUREMENT MODE

When the controller is initially powered on, it automatically enters into the Measurement
mode after the large dual LCD displays all segments briefly.

Please notice: in order to get exact measurement information, users should
calibrate measurement system (transmitter and electrode).

MEA at the top of the LCD shows that the instrument is
under the status of measuring. The upper display shows
pH or ORP value, while the lower display shows
temperature value under pH measurement mode or ORP
under ORP measurement mode. Annunciator at the left
lower side of the display shows the value of transmitting
output electric circuit, which as the way that users can
calibrate the output electric circuit.

Such annunciators or icons, as pH, mV, %, at the right
side of the display show the current different
measurement mode of transmitters.

In measurement mode, you can press key once or twice to enter into the function
form of calibration or set password input.

Then input relevant password to enter into calibration mode or set up mode. Please refer to
Item 3(Calibration Mode) or Item 4 (set up mode).

Press

key under measurement mode, you can open or close back light of LCD.

MEA

7.00

PH

SPI ATC

mA

250

C

SP2

_______________________________________

18

4 CALIBRATION MODE

You can press once under measurement mode and then input password 28 to get access

to calibration mode. Please operate according to following:

4.1 ENTERING CALIBRATION MODE

000

SET

028

SET

CA

CAL

HOLD

CAL

HOLD

mV

k=

CAL

HOLD

7.00

CAL

HOLD

4.00

CAL

HOLD

7.00

CAL

HOLD

mV

k=

CA

CAL

HOLD

CA

CAL

HOLD

CA

CAL

HOLD

MEA

4.00

PH

SPI ATC

mA250

C

SP2

8.58

MOD

MEA

7.00

PH

SPI ATC

mA

C

SP2

I2.00 25.0

4.00 059.0

059.0 7.00

7.00

PH

PH

Put the sensor into pH7.00buffer
after, display valus stable meter

automatic lock the value 5 seconds
later

Put the sensor into pH4.00buffer
after, display valus stable meter
automatic lock the value 5 seconds

later

done

ESC

ENT

ENT

ENT

ENT

ENT

ENT

1.Press

once under measurement mode to enter into function form for password input of

calibration mode.

2. After entering function form of calibration password input, LCD will ask you to input

password. Press ▲ or ▼ to input calibration password 28, then press ENTER to confirm
the password.

3. Press ENTER to enter into calibration sub function form, if instrument is set up as pH

measurement mode, lower display will show CAL pH. If instrument is set up as ORP
measurement mode, lower display will show CAL ORP. If you want to calibrate. (please
refer to upper pictures).

NOTE : Anytime press to quit calibration mode and return to upper
function. If returning to measurement mode, old calibration information will
be kept and used. After returning to measurement mode, password will
automatically set up form 28 to 000 when entering calibration mode.

19

4.2 pH CALIBRATION

This instrument can conduct one point or two points calibration in pre-set standard buffer

liquid. The value of standard buffer solution is based on 25°C.

1. Entering calibration mode as Item 4.1 described. LCD will show CAL pH. (pH

Calibration mode).

Note

: If LCD shows CAL ORP, please switch pH and ORP measurement mode

according to the procedures of Item 5.8.

2. Press

key to enter into calibration, LCD will show slope and function form. The

lower display will show ELE K=59.2, this function form shows the slope of last

calibration. The upper display will show CAL and the main display zone will show

SLOP. Press

key to enter into calibration procedures, LCD main display zone will

show actual measured value, the right lower display will show the value of standard

solution which should be calibrated.

3. Put electrode into the first standard buffer solution. You should put temperature

electrode into the same solution under the automatic temperature compensation mode.
As the same, you should put liquid earth wire electrode into the solution at the same time
in balanced input mode.

4. You can select one point calibration or two point calibration: Press

key to calibrate

at 6.86 or 7.00pH. The lower display shows BUFF 6.86(7.00) to tell user the standard

solution value. BUFF will blink when calibrating. During calibrating process,

instrument will automatically distinguish signals which electrode input. If the signal

input in required time is stable and in the slope range, the instrument will accept the

calibration, it will record and modify the zero point information of the electrode. The

lower display will show BUFF 1.68 to tell the standard solution value the second point

of calibration. Users can press

or key to select relevant calibration

solution. ✈USA 1.68>4.01>10.01>12.45_(NST 1.68>4.01>9.18>12.45).

_______________________________________

20

Press twice to quit one-point calibration and return to measuring status. Press

to continue next point calibration.

Take electrode out of the first standard solution, clean it and put it into the second

standard solution.

5. If one point calibration is selected, instrument will show the slope, but zero point adopts

new calibration value while the slope remains the value of last calibration. If select two

point calibration, the lower display will show the next value of standard buffer solution.

Use

or key to selects the second standard buffer solution from the pre-set

standard buffer solution. Take electrode out of the first standard solution, clean it and

put it into the second standard solution. Press

key, BUFF will blink. Instrument

will modify the indication to the value of standard solution.

6. After finishing the second calibration in standard buffer solution, instrument will

automatically show SLOP on LCD main display zone. The right lower display
shows the slope of electrode. Parameter of zero point and slope will be renewed
after each calibration.

21

NOTE: Press key to quit set up mode at any time. Instrument will
return to measurement mode automatically.

NOTE: Transmitter will show ERR when calibration is in error. Under

this situation, press

to quit and calibrate again from step 1. It will show

ERR again under following situations:

(1) Use wrong standard solution or standard solution is expired.
(2) Electrode is aging or not clean or broken.
(3) Electrode wire is broken or joint corrosion has occured.
NOTE: When calibrating under manual temperature compensation,
transmitter will automatically switch to calibration temperature from pre-set
measurement temperature. When leaving calibration mode, transmitter will
switch to measurement temperature again. (Please refer to Item 5.2 for
setting measurement temperature and calibration temperature)

NOTE: ELE K=59.1 presents the conversation coefficient 59.1mV/pH

of pH electrode, which means each pH is converted by 59.1mV
electric potential.

For example: when slope is 90%, the conversation coefficient is

59.1 * 90%=53.19.

When the conversation coefficient is lower than 45mV, which is
equal to 75%, users should change electrode. Instrument will
show ERR automatically when the conversation coefficient is
lower than 40mV, which is equal to 67% slope.

_______________________________________

22

4.3 ORP CALIBRATION

If transmitter is set up as ORP measurement mode. You can only calibrate one point.

1. Entering calibration mode described as Item 4.1. LCD will show CAL ORP.

NOTE: If LCD shows CAL pH. Please switch to ORP mode from pH mode according to

procedures of Item 5.8.

2. Put ORP electrode into ORP standard solution (86mV).

3. Press

key to begin calibrating. mV value displayed is the mV value output by ORP

electrode. There is no offset value. The lower display will show U and blink. If one point

calibration is finished, Then, the lower display shows 255mv to tell user to change standard

solution.

4. Clean electrode and put it into relevant standard solution. Press key to confirm.

Instrument enters into calibration mode. After calibrating, instrument automatically returns

to slope display function form. Press

to return to measurement mode and finish

calibration process.

CAL

HOLD

mV

086.0

CA

CAL

HOLD

MEA

0

SPImASP2

mV

000

SET

028

SET

CA

CAL

HOLD

CA

CAL

HOLD

CAL

HOLD

mV

086.0

MEA

255

SPI

mA

mV

0.086

0.255

6.90

4.00

done

Put the sensor into ORP86mV U
after, display valus stable meter

automatic lock the value 5 seconds
later

Put the sensor into ORP255mV U
after, display valus stable meter
automatic lock the value 5 seconds
later

MOD

ENT

ESC

ENT

ENT

U

U

23

5 SET UP MODE

ENTERING SET UP MODE

In set up mode, transmitter can be set up according to your need.

1. Press

twice in measurement mode.

2. LCD will ask you to input password. Use

or

to input the password.

– Input XXX to change parameter.

3.Press

to confirm.

NOTE: Press twice to quit set up mode at anytime. Instrument will
return to measurement mode automatically.

000

SET

000

SET

XXX

SET

MOD

ENT

MEA

7.00

PH

SPI

ATC

mA

C

SP2

I2.00 25.0

MOD

_______________________________________

24

5.1 P01: TEMPERATURE SET-UP SUB-FUNCTION

done

done

HOLD

SET

SET

SET SET

SET

HOLD

SET

HOLD

SET

HOLD

HOLD

HOLDHOLD

HOLD

ESC

ENT

ENT

ENT

ENT

ENT

ENT

ESC

ESC

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

1.Press

to enter from P01 screen. LCD main display zone shows ON, which means

automatic temperature compensation function, is on. User can press

or

to switch

to OFF and stop automatic temperature compensation function.

2.Press

when automatic temperature compensation function is on, instrument enters

into modifying status of temperature measurement value. LCD main display zone show

current measurement value of temperature. The lower display TOFS tell users that they

can use

or

to modify current temperature display value. Press

to confirm and

return to P01 Sub-function form. Use

or

to select other sub functions or press

to return to measurement status.

3. In the status of manual temperature compensation, press

and instrument enter set up

status of manual temperature compensation user can use

or

to set up process

temperature TST1 and calibration temperature TST2. Press

to confirm and return to

P01 Sub-function form or press

or

to select other sub functions to set up or press

to return to measurement status. TST1 is the compensation temperature under

normal measurement while TST2 is the compensation temperature under calibration.

Since temperatures are not the same in calibration and normal measurement when

instrument is used, two set up values under manual temperature compensation status are

convenient. Users should not set manual temperature compensation value back and forth.

For example, if user’s process temperature is 50.0°C and the temperature of standard

solution when calibrating is 10.0°C, user can set TST1 as 50.0°C and set TST2 as

10.0°C for convenient use.

25

5.2 P02: OFFSET SET-UP SUB-FUNCTION

1.In P02 sub-function form, Press

. LCD main display zone shows pH actually measured

value in pH measurement mode. The lower display shows POFS. The right lower display
show offset. LCD main display zone shows ORP actually measured value in ORP
measurement mode. The lower display shows UOFS. The right lower display show offset.

2.User can press or to adjust offset to modify measurement value. Press to confirm

and return to P02 sub-function form. Use

or to select other sub-function to set up.

Note: Press to quit set-up mode at anytime. Instrument will return to
measurement mode automatically.

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

done

HOLDHOLD

SET

HOLD

07.00

SET

HOLD

ESC

ENT

ENT

_______________________________________

26

5.3 P03: OUTPUT ELECTRIC CIRCUIT (SP1/SP2) SUB-FUNCTION

done

done

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

ESC

ESC

ENT

ENT

ENT

ENT

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

1. Press

to confirm in P03 sub-function. Entering set up of the sub-function.

2.The lower display shows CTYP. The upper display shows 4 (it means electric circuit output

from 4 m A to 20 m A). User can press

or

select 0 (it means electric circuit output

from 0 to 20 m A). Press

to confirm and enter into set-up of transmitting range.

3.The lower display shows CURL while the upper display shows 0.00, which means that

0.00mA transmitting range indicates 0.00pH. User can press

or

to adjust the actual

value. Press

to confirm. The lower display shows CURH while the upper display

shows14.00, which means 20.00mA transmitting range indicates 14.00pH. User can press

or

key to adjust the actual value. Press

to confirm and return to P03 sub-

function firm. Use

or

to select other sub-functions and to set up.

For example, set CTYP to 0 or 4, set CURL to 2.00 and set CURH to 10.00, which means 0 or

4 to 20mA output mode is selected as circuit output. 0/4.00mAindicates 2.00pH, 20.00mA

indicates 10.00pH

°

Note: Press to quit set-up mode at anytime. Instrument will return to measurement
mode automatically.

Note: This parameter allows you to set range of circuit output, but
transmitting high point and low point can’t be overlapped.

27

5.4 P04: CONTROL MODE SUB-FUNCTION

1.Press

in P04 sub-function form to enter into set up procedure.

2.The lower display shows CNTR while the upper display shows LIT. (The control mode of

instrument is under limited control mode). User can press

or to select PLC mode

(The control mode of instrument is under proportion control mode). Press

to confirm

and return to P03 sub-function form. Use

or to select other sub-functions and to set

up.

Note: Press to quit set up mode at any time. Instrument will return to

measurement mode automatically.

done

done

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

ESC

ESC

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

_______________________________________

28

5.5 P05: RELAY 1 SET-UP SUB-FUNCTION

1.In P05 sub-function form. Press

to enter into set-up procedure.

2.The lower display shows SP1 while the upper display shows HI, which means set point 1 is

under high-point control status. (If instrument control made is set up to LIT limited point

control mode, relay begins to work when the measured value up to set value. If instrument

control mode is set up to PLC proportion control mode, measured value must be raised to

approach set value). Press

to confirm and enter into next set up procedure.

3.The lower display shows SP1 U while the upper display shows value. User of the function

form can press

or

to adjust the value to confirm set up value. Press

to confirm

and enter into next set up procedure.

4.This function form sets hysteresis band under limited control mode to protect relay, which

may oscillate frequently around set point and be damaged. Controlling proportion range is

set up under proportion control mode (this parameter is not lower than 5 under PLC mode)

to confirm and adjust time period of adding chemical automatically. Press

to confirm

and enter into next set up procedure. Under proportion control mode, this function form is

used to set time period of whole controlling circle. Press

to confirm and return to P05

sub-function form. USE

or select other sub-function and to set up.

Note: Press to quit set up mode at any time.

Instrument will return to measurement mode automatically.

done

done

done

done

HOLD

HOLD

SPI

HOLD

HOLD

SPI

U

SET

SPI

SET

HOLD

SPI

SET

HOLD

SPI

HI

SET

HOLD

SPI

0I0

SET

HOLD

SPI

SET

HOLD

SPI

HI

SET

HOLD

SPI

0I0

SET

HOLD

SPI

SET

HOLD

SPI

SET

HOLD

SPI

SET

HOLD

SPI

SET

HOLD

SPI

SET

HOLD

SPI

SET

HOLD

SPI

SET

HOLD

SPI

SET

U

HOLD

SPI

SET

U

HOLD

U

SPI

SET

HOLD

ESC

ESC

ESC

ESC

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI

ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

29

5.6 P06: RELAY 2 SET-UP SUB-FUNCTION

Working principle of this part is the same as which of P05 relay 1 set-up sub-function. Please

operate according to P05.

done

done

done

done

HOLD

Sp2

USp2

I0.00

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

U

Sp2

I0.00

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

U

Sp2

I0.00

SET

HOLD

Sp2

0I0

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

U

Sp2

I0.00I0.00

SET

HOLD

Sp2

0I0

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

Sp2

SET

HOLD

ESC

ESC

ESC

ESC

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

NOTE: Set-up value range of hysteresis band under limited control mode is from

0.00—2.00PH. For example, if high point is 7.00pH and hysteresis band is

0.50pH, movement range of the relay is from 6.50pH to 7.00pH. If low point is

6.00pH and hysteresis band is 0.20pH, movement range of the relay is from

6.00pH to 6.20pH.

NOTE: In PLC control mode, movements of the relay meet following formulas:

C * (VM – VS) * U * T / 14
C

is discriminate parameter for high / low point.

It is -1 when set to high point and it is 1 when set to low point.

VM is measured value.
VS is set value.
U is control parameter.
T is time constant (represent the whole movement circle of relay)

For example, set high point is 7.00pH, actual measured value is 6.50pH, control parameter is

10, time constant is 10 seconds.

-1 * (6.50-7.00) * 10 * 10 / 14 =3.57 second

According to the above formula, pickup time of relay is 3.6 second and release time is 6.4

seconds.

If the result of above formula is negative, relay won’t move. If the result is move than T,
relay keeps picking up until the result is less than T.

_______________________________________

30

5.7 P07: ALARM RELAY 3 SET-UP SUB-FUNCTION

1.Select P07 sub function, Press

to confirm. Enter into set-up procedure.

2. Select working mode. Press or to select suitable control mode.

– CLE=relay 3 as cleaning control relay

– CAL=relay 3 as calibrating indication relay

– ALL=move with two relays simultaneously

– SP1=relay 3 moves with SP1 (limited control mode only)

– SP2=relay 3 moves with SP2 (limited control mode only)

– OFF

=relay 3 is off

Press ENTER to confirm your set up.

If user select CAL working mode, he can set calibration indicate intervals in
the function form, use hour as the unit. In this way, instrument and electrode
can keep their reliability.

If user select CLE working mode, he can set cleaning time intervals in the
function form, use hour as the unit; cleaning continuous time, use second as
the unit. In this way, instrument and electrode can keep their reliability. User
can install cleaning equipment to increase service life and reliability of
electrode.

3.Press

to confirm and return to P07 sub-function form. Use

or

to select other sub-

functions to set up.

NOTE: Press to quit set up mode at any time. Instrument will return to
measurement mode automatically.

done

done

done

HOLD

SET

HOLD

SET

HOLD

SET

Sec

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

Sp2

SET

HOLD

Sp

SET

HOLD

SET

HOLD

ESC

ESC

ENT

ENT

ESC

ENT

ENT

ENT

ENT

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

31

5.8 P08: pH/ORP function AND SENSOR CONFIGURATION sub-function

1.In P08, Press

to confirm and enter into set up procedure.

2.Press to confirm. If you select ORP or voltage measurement mode, after to

confirm, instrument will return to P08 sub-function form. If you select pH measurement

mode, instrument will enter electrode-select function form automatically. The lower

display shows SENS, and main display zone. Shows electrode kind, glass electrode or

antimony electrode. User can use

or to select the electrode kind he need. Then,

press

to confirm and enter into select items for standard solution. The lower display

shows BUFF while the upper display shows NST (Nist standard) or USA (USA standard).

User can use

or to select items according to kind of standard solution, press the

to confirm. The next is the Temperature Filter (Filter 1), press the or key to

set the number, then press the

to confirm, and then that will enter the pH/ORP Filter

(Filter 2). Press the

or key to set the number and press the to confirm. Press

to confirm and return to P08 sub-function form. Use or select other sub

functions to set up.

NOTE: Press to quit set-up mode at any time. Instrument will return to

measurement mode automatically.

done

HOLD

HOLD

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

SENS

SET

HOLD

FUNC

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SENS

SET

HOLD

SET

HOLD

SET

HOLD

FUNC

SET

HOLD

FUNC

SET

HOLD

ESC

ENT

ENT

ENT

ENT

ENT

ENT

ENT

ENT

HOLD

HOLD

_______________________________________

32

5.9 P09: transmitting rate sub function

1. Press

to confirm in P09 and enter in set-up procedures.

2. The lower display shows nb while the upper display shows 001, which indicates that user

is setting communication address ID NO. of the instrument, from 001 to 128. Use

or

to select necessary ID and press

to confirm. Then enter into next set up function

form.

3. The lower display of the instrument shows bt while the upper display shows 005, which

indicates that user is setting communication rate function. Use

or

to select

necessary communication rate. Press

to confirm and return to P09 sub-function form.

Use

or

to select other sub-function to set up.

4.Corresponding communication rate to codes.

bt

000

001

002

003

004

005

006

007

baud rate

300

600

1200

2400

4800

9600

19200

38400

Note: Press to quit set-up mode at any time.

Instrument will return to measurement mode automatically.

done

HOLD

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

ESC

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

33

5.10 P10: reverting to factory default settings

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

done

done

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

SET

HOLD

ESC

ESC

ENT

ENT

ENT

7.00

SPI ATC

O

C

SP2

I2.00 25.0

MEA

PH

1.Press

in P10 to enter into set-up procedures.

2.The lower display of the instrument shows DEF while the upper display shows NO (YES).

User can press

or to select necessary items. If select YES, all settings will be reset to

factory default. User’s setting will be lost.

NOTE: Press to quit set-up mode at any time.

Instrument will return to measurement mode automatically.

_______________________________________

34

5.11 COMMUNICATION PROTOCOL

1. Protocol setting

This instrument uses RS-485 communication. It’s can be connected with 1 to 64 instruments

in 2 wires at the same time and communicate with PC. The distance of communication is

around 1200M.

The data form is “N81”(1 start bit, 8 data bits,1 stop bit, NO verify check code)

The baud rate is 300 to 38400 bit/s (usually is 9600 bit/s)

Users have to set the ID(NB) of the instruments and the baud rate(BT) before connecting to
RS-485
BT01234567
Baud
rate

300

600

1200

2400

4800

9600

19200

38400

Usually, the instrument is in stand by in receiving status. Once it receives the correct ID then
it will send out the data to PC. Finished sending it will enter into receive status again.
To avoid the conflict, each instrument has to use different ID(decided by NB)
All of the instruments and PC must use the same baud rate.(decided by BT)

2. Data form

All one-word data is from -32767 to +32767, using the hexadecimal number system, the high
bit is sign.
All one-byte is integer.
The data is ASCII code :the start sign is @(40H), the end sign is CR(0DH)
The other data use the ASCII code to express the hexadecimal number system
All data should be between 30H to 39H and 41H to 46H. the instructions are form 51H to
5AH.
Double-byte sending: the low byte is the first, the high byte is the second
One-byte sending: the high nibble is the first, the low nibble is the second.
A full communication form is :40 ,ID, the sequence of the instruction,CRC,0D
The ID is the number of the instrument(NB)
CRC is the Circulation redundant codes verification, it’s the ID code and data codes XOR
result.

35

3. The communication instructions

1_ RD: read floating data
2_ RE: read the appointment data by start address and bytes (the large byte can not over 28

bytes)

3_ RR: read all of data (8-word, 12-byte), totally 28 bytes.

4. Introduce the instructions( the ID is 1)

1_ RD (read the floating data): PC send: 40,30,31,51,44,CRCH,CRCL,0D (8 bytes)

40: start byte
30 31: the ID of instrument (the hexadecimal: 0~3FH, ASCII: 30 30~33 46)
51 44: instruction of R, D
CRCH,CRCL: CRC
0D : the end byte

the response by instrument is “40, 30, 31, 52, 44, 30,
30,V1LH,V1LL,V1HH,V1HL,3X,V2LH,V2LL,V2HH,V2HL,3X,3X,3X,3X,

3X,CRCH,CRCL,0D”

40 : the start byte
30 31 :the ID of instrument
52 44 30 30 : the fixed data
V1LH,V1LL, V1HH,V1HL: pH/ORP value

3X: the position of decimal (32:pH mode,2 decimal; 30:ORP/mV mode, no

decimal)

V2LH, V2LL, V2HH, V2HL : temperature value
3X : the status of relay 1 , 30 :open ;31:close
3X : the status of relay 2 , 30 :open ;31 :close
3X : the status of relay 3, 30 :open; 31:close
3X : ERR status, 30 : correct; 31:error
3X : parameter modify, 30: no modify; 31:modify
CRCH,CRCL : CRC
0D : the end byte

Total : 24 bytes

_______________________________________

36

2) RE (read the appointment data)

The PC send : 40, 30, 31, 52,45, 30, 30, adrH,adrL, lthH, lthL, CRCH, CRCL, 0D (total

14 bytes)

40 : the start byte
30 31 : the ID of instrument (the hexadecimal: 0~3FH, ASCII): 30 30~33 46) :
52 45 : the instruction R, E;
30 30 :reserve
adrH adrL : the address of the start parameter byte(the hexadecimal: 0

~1BH: ASCII :30 30~31 42) :

1theH 1theL : the count of the parameters (the hexadecimal: 1~1CH ; ASCII:

30 31~31 43) :

CRCH CRCL : CRC
0D : the end byte

The adr is the start address(00~1BH),1th is the count of the byte. The
table is the relation of the adr and parameter.

adr000102030405060708090A0B0C0D

para

TST1

TST1

TST2

TST2

SP1U

SP1U

SP2U

SP2U

CURL

CURL

CURH

CURH

POFS

POFS

adr0E0F101112131415161718191A1B
para

HOR

HOR

AAA

FUNC

R3OP

TOFS

SEC

SP1D

SP1T

SP2D

SP2TNBBT

CONF

If adr>1BH or adr+1th>1BH, the return the error code: 40,30,31,52,45,2A,2A,CRCH,CRCL,0D

The 2A 2A is the error sign

If the address range is correct then the instrument will send back data :

40,30,31,52,45,D1,D2,D3,………Dn,CRCH,CRCL,0D

40:the start byte

30 31 : the ID
52 45 : the fix data

D1~Dn : parameters from instrument to PC
CRCH : CRCL:CRC

0D : the end byte

3) RR (read all of parameters) the PC send : 40,30,31,52,52,CRCH,CRCL,0D(8 bytes)

40: the start byte
30 31 : the ID

52 52 : the instruction of R, R

CRCH,CRCL :CRC

0D : the end byte

37

The instrument response : 40,30,31,52,52,D1_D2,………,D55_D56,CRCH,CRCL,0D(64

bytes)
40 : the start byte
30 31:ID
52 52 : the fix data

D1_D56_the parameter of sending (8 double byte,12 byte, total 28 bytes)
CRCH_CRCL: CRC

0D: the end byte

4. Notice for programming the communication program

If the instrument receives the data with the start byte is 40 and the count of sequence data

over 16 bytes and did not find the 0D then the data is invalid. The instrument will not respond.

If the sequence data is not between 00H to 0FH, the sequence data is invalid. The instrument
will not respond. But the other errors, ex: the wrong instruction, the wrong address, the wrong
parameter counts, the wrong CRC and so on, the instrument will respond the wrong information.

All parameters, please see the following table, some parameters are include decimal.

para

TST1

TST2

SP1U

SP2U

CURLCURHPOFS

HOR

AAA

FUN
C
decima

110/2

0/2

0/2

0/2

0/200

0
para

R3OP

TOFS

SEC

SP1D

SP1T

SP2D

SP2TNBBT

CON
decima

010

0/200/20000

The PC display the reading values should be include the decimal.

TOFS is the correct value of temperature, the setting range is 0~200, the display range is
–100~100, so the PC should be subtract 100 and display with sign.

1) FUNC is the display mode of instrument : 0=mV; 1=ORP; 2=pH

2) R30P is the mode of relay 3: 0=NOR : 1=SP1; 2=SP2 ; 3=ALL ; 4=CAL ; 5~CLE

°

3) AAA is the reserve parameters

4) CONF is a byte parameter, the define is following,

Bit 7 : temperature compensation : 1=automation 2=manual

Bit 6: current output, 1=4_20mA ; 0=0~20mA ;
Bit 5: SP1 , 1=HI ; 0=LO ;
Bit 4: SP2 , 1=HI ; 0=LO ;
Bit 3 : control mode , 1=PLC ; 0=Lit ;
Bit 2 : electrode selection , 1=ANTI ; 0=GLAS ;
Bit 1: buffer, 1=NST ; 0=USA;

Bit 0 :reserve

_______________________________________

38

6 TECHNICAL PARAMETERS

6.1 TECHNICAL PARAMETERS FORM

PHCN-961 Transmitter / Controller

pH Range

-2.00 to 16.00 pH

Analytical degree & precision

0.01 pH and ± 0.01 pH

mV Range

-1999 to1999 mV

Analytical degree & precision

1 mV / ± 1 mV

Temperature

-9.9 to 130 oC

Analytical degree & precision

0.1 & ± 0.5 oC

Temperature electrode

Pt 1000

Temperature compensation

Automatic (± 10 oC offset adjustment) / manual

Set point and control function

Control function

Limited point / proportion

( pulse length )

Cleaning circle

From 1 to 999 hours

Cleaning time

From 1 to 999 seconds

Control hysteresis band

0.01 to 2 pH

ORP hysteresis band

1 to 200 mV

Relay output

Three SPST relays_250V1A

Communication
RS-485 client program
Electric current information and connection

Electric source

110 or 220 V AC / 60 or 50 Hz

Signal output / load

0/4 – 20 mA isolated current output

Signal output load

600Ω

pH / ORP input

BNC (1013 impedance)

Connection terminal

Removable plug-in unit

Main fuse wire

250 mA, anti-surge

Alarm function

Function ( switch able )

Close

Display

LCD( liquid crystal display)

Big-size screen of cystal display, blue back light

EMC Specification

Electromagnetic emission

EN 50081-1

Electromagnetic induction

EN 50082-1

Environmental conditions

Working temperature

-10 to 50 oC (14 to 122 oF)

Humidity

10 to 95% (no frozen dew)

Protection grade

NEMA 4X, IP 65

39

6.2 PARAMETER SETTING AND FACTORY PRELIMINARY VALUE

NO.

Indication

Parameter

Name

Symbol

Contents

Remark

Valid range

Factor

y value

01

LOCK

LOC

Password for entering function

0~200

0

02

ATC

AtC

Auto temperature compensation

ON/OFF

OFF

03

TSET1

tSt1

Temperature set up of manual

-10.0~100.0°C

25.0

04

TSET2

tSt2

Calibration temperature set up

Only valid for manual

0.0~60.0°C

25.0

05

P1

TC

TOFS

tOFS

Temperature measurement offset

Only valid for manual

-10.0~10.0°C

0.0

POFS

POFS

PH value measurement offset

Only valid for PH mode

-2.00~2.00PH

0.0006P2

OFS

VOFS

VOFS

mV value measurement offset

Only valid for ORP mode

-200~200mV

0

07

CTYP

CtyP

Type of current output

0/4 ~20mA

4

08

CURL

CUrL

Low limit of transmitting output

-1999~1999

0

09

P3

CUr

CURH

CUrH

High limit of transmitting output

PH mode: 0.01PH unit

ORP mode: 1mV unit

-1999~1999

1400

10

P4Cntr

CNTR

Cntr

Control way of relay 1, 2

PLC/ Lit

Lit

11

SP1

SP1

Way set up of relay 1

HI / LO

LO

12

SP1U

SP1U

Setting value of relay 1

-1999~1999

400

13

SP1D

SP1d

Relay 1 hysteresis / proportion

PH mode: 0.01PH unit

ORP mode: 1mV unit

0~200 (2.00)

10

14

P5

SP1

SP1T

SP1t

Relay 1 circle (second)

Only valid for PLC

0~200 seconds

20

15

SP2

SP2

Way set up of relay 2

HI / LO

HI

16

SP2U

SP2U

Setting value of relay 2

-1999~1999

1000

17

SP2D

SP2d

Relay 2hysteresis / proportion

PH mode: 0.01PH unit

ORP mode: 1mV unit

0~200 (2.00)

10

18

P6

SP2

SP2T

SP2t

Relay 1 circle (second)

Only valid for PLC

0~200 seconds

20

19

R3OP

r3OP

Working mode of relay 3

OFF/SP1/SP2/

ALL/CAL/CLE

CAL

20

INT

HOr

Interval (hour)

valid for calibration and

cleaning mode

0-999

100

21

P7

rL3

DUR

SEC

Operating time (second)

valid for cleaning mode

0-200

30

22

FUNC

FUnC

PH / ORP/mV select

PH/ORP/mV

PH

23

SENS

SenS

Antimony / glass electrode select

Anti/GLAS

GLAS

24

P8

CONF

BUFF

buFF

USA/nST standard select

Only valid for PH mode

NST/USA

USA

25NBnb

Set ID number for 485

0-63

126P9

ID

BTbtCommunication rate

0-7

5

27

P10

DEF

DEF

dEF

Reverting to factory default

setting

Reset to factory default

parameter.

YES/NO

NO

_______________________________________

40

APPENCLIX 2 – pH TEMPERATURE CORRESPONDING TO pH BUFFER
SOLUTION

Following form shows standard pH value of pH standard buffer solution under different

temperature

Temperature

(oC)

pH 1.00

pH 4.01

pH 6.86

pH 7.00

pH 9.00

pH 9.18

pH 10.01

0

0.96

4.01

6.98

7.12

9.33

9.47

10.32
5

0.99

4.01

6.95

7.09

9.24

9.38

10.25

10

0.99

4.00

6.92

7.06

9.16

9.32

10.18

15

0.99

4.00

6.90

7.04

9.11

9.27

10.12

20

1.00

4.00

6.88

7.02

9.05

9.22

10.06

25

1.01

4.01

6.86

7.00

9.00

9.18

10.01

30

1.01

4.01

6.85

6.99

8.95

9.14

9.97
35

1.01

4.02

6.84

6.98

8.91

9.10

9.93
40

1.01

4.03

6.84

6.97

8.88

9.07

9.89
45

1.01

4.04

6.83

6.97

8.85

9.04

9.86
50

1.01

4.06

6.83

6.97

8.82

9.01

9.83
55

1.01

4.08

6.83

6.97

8.79

8.99

9.81
60

1.02

4.10

6.84

6.98

8.76

8.96

9.79
70

1.02

4.12

6.85

6.99

8.72

8.92

9.76
80

1.02

4.16

6.86

7.00

8.68

8.89

9.74
90

1.02

4.20

6.88

7.02

8.65

8.85

9.73

41

Appenclix 3 – hysteresis band

Simple Explanation on the Function of Hysteresis Band

The controller relay activates when the set-point is reached. In the reverse direction, it

closes. Relay continues to be active till the value reaches the amount set by hysteresis band.

4.0 4.5 9.5 10.0

7.0

RELAY OFF

HYSTERESIS BAND
(DEFAULT = 0.5 pH)

FORWARD DIRECTION

REVERSE DIRECTION

SP1

SP2

RELAY ON

SP1 Set to LO
SP2 Set to HI

_______________________________________

42

APPENCLIX 4 – CONTROL MOVEMENT

General Instructions Concerning Controller Setting

MIN Function

MAX Function

Xp

Prop. Band

Xp

Prop. Band

SP 1

SP 2

+ Xw

- Xw

Yh

0 %

50 %

100 %

Control characteristic of P-Controller as proportional controller

MIN Function

MAX Function

Xp = 0

Xp = 0

SP 1

SP 2

+ Xw

- Xw

Yh

0 %

50 %

100 %

Control characteristic of P-Controllers as limit value switch

43

Control signal of pulse length control

t

ON

t

OFF

Pulse Length T

Relay

ON

OFF

Time [s]

Control signal and pulse length control

Out put of relay controlled by hysteresis band is time. Crile T for open or close is constant. Different

value comes from limited value, increase or decrease of open time is in accordance with proportion range.

Following applications_

t

ON

+ t

OFF

= T (Const.)

greater divergence



greater t

ON

Xp exceeded



tON = T (relay remains picked up)

_______________________________________

44

ACCESSORY 5 – ABBREVIATIONS IN FUNCTION FORM

Character

Meaning

MEA

Measurement mode

CAL

Calibration mode

ENT

Confirm

OFS

Zero point offset

SET

Set up

ATC

Automatic temperature cor

SP1

Set point 1

SP2

Set point 2

LO

Low limit

HI

High limit

CNtr

Control

LIt

Limited point control

PLC

Pulse length control

RL3

Relay

OUT

Output signal

CONF

Configuration

CLE

Clean

GLAS

Glass electrode

ANTI

Antimony electrode

DEF

Default

CUR

Output electric circuit 1

WARRANTY/ DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1)
month grace period to the normal one (1) year product warranty to cover handling and shipping
time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired
or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action
of the purchaser, including but not limited to mishandling, improper interfacing, operation outside
of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit
shows evidence of having been tampered with or shows evidence of having been damaged as a
result of excessive corrosion; or current, heat, moisture or vibration; improper specification;
misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in
which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
for any damages that result from the use of its products in accordance with
information provided by OMEGA, either verbal or written. OMEGA warrants only that
the parts manufactured by the company will be as specified and free of defects.
OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND
WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED
WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The
remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA
with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a
“Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or
(2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability
or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN
ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the
outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY

RETURNS, please have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which

the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY

REPAIRS,

consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the

COST of the repair,

2. Model and serial number of the

product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2011 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, repro-

duced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.

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Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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