Omega PHCN-962 User manual

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Preface
This manual serves to explain the use of PHCN-962 series controller / transmitter. This instruction
manual is written to cover as many anticipated applications of PHCN-962 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 OMEGA ENGINEERING.
OMEGA ENGINEERING.can not accept any responsibility for damage or malfunction of the unit
due to improper use of the instrument..
Copyright©2007 OMEGA ENGINEERING，All right reserved。

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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.

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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-962 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

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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

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1 PREFACE
BEFORE USE
Thank you for using OMEGA ENGINEERING. PHCN-962 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, relevant
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 contents and safety instructions and warming of potential
dangerous. If they are neglected, person may be hunted and property may be
damaged.
This symbol means the contents are appendix information. If they are neglected, it
will cause low efficient and even losing products.
Instruction manual should be kept accessible within the person who use pH/ORP controllers /
transmitters.
If you have problems, which are not mentioned or cannot be explained in this manual, please contact
with your suppliers. They will be very glad to help you.
IN USE
OMEGA ENGINEERING. pH/ORP controllers / transmitters, as described instruction manual, are
intended to separate pH or ORP and temperature measurement.
Any other uses, or other unmentioned use in instruction manual, are not acceptable when they contradict
the technical parameters
Other conditions of right use include:
– Notice remarks and requirements stated in instruction manual.
– Notice local safety regulations about safe operation.
– Notice information and warning of products that are used together with the
transmitters in the contract. (Chassis, electrode, etc.)
– Notice required using environment and working condition.

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SAFETY INSTRUCTION
pH / ORP transmitters should be installed and operated by qualified person who
are familiar with the work.
Transmitters with problems should not be installed and used.
pH / ORP transmitters should be used under the required working condition.
pH / ORP transmitters should be open and repaired by clients them selves.
Mollified 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 should bear all the risks.
This instrument has a protection level of IP65. Please use waterproof cable glands
when you connect the line. Also, please loose it when you open the cover. After
connecting the line, please tighten the cable conductor according to the above
table 3 with attached tie line, or it will cause danger because cable conductor or
interface falls off when open the cover.
Please make sure to cut the power when you open the cover to carry
through any operation.

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2 PRODUCT DESCRIPTION
2.1 DESCRIPTION OF INSTRUMENT SPECIALITY:
OMEGA ENGINEERING.pH / ORP transmitters are used to measure pH or ORP and
temperature value. pH or ORP measured value can use PLC or LIT to control precisely adding
medicine.
This kind of transmitters has two versions: one is installing way and the other is wall hanging installing
way. Transmitters can be used as monitor in water treatment, in electrolytic water cleaning, in process of
chemical industry, in food process, in cleaning water or wastewater treatment and in neutralization process.
This transmitter has many user-friendly and safety features which include:
• Menu-driven programs that easy to set-up.
• Strong interference protected design can be used in strong.
• IP65 all-day water and air proofing can be used in any adverse circumstances.
• Built-in memory backup to ensure that setup parameter and calibration information are not erased if
power off or power off in abnormal condition.
• Can separately set process temperature (TST1) and Calibration temperature (TST2) by manual
operation. Without doing trivial manual temperature setting. If the temperature sensor fails. Under
automatic temperature compensation mode, instrument will automatically switch to process
temperature (TST1) of manual temperature compensation to compensate. This can ensure that the
instrument can be working normally. Please refer to procedures of Item 5.1.
• pH measured value can make offset adjustment (adjusting scope ±2PH) so that users can calibrate
online. Please refer to procedures of Item5.2.
• Various choice of electric current output. 0/4-20mA Output scope can be set. (Over / pH). Please
refer to procedures of Item5.3.
• Two routes of relay contacts, users can choose high-low meta control independently and freely.
• Separately adjustable high and low set point hysteresis (dead bands) prevent oscillating of relays
around the set points.
• Various adding-medicine control mode, users can choose precise adding-medicine (PLC) and LIT.
Two groups of relays can switch high-low point control freely. Please refer to procedures of Item 5.4.
• Two kinds of electrode input, users can choose balanced input and imbalanced input. Users can
choose balanced input mode under the strong interference industrial situation. Please refer to
procedures of Page 17.
• Large dual display LCD for easy reading with clear multiple annunciators, alarm status and
operational message annunciators. Long-life micro-switch key can set easily.
• Can set time of instrument and electrode to reduce person management. Instrument will
automatically appear “CAL” at regular time to call person to make calibration and maintain once.
Please refer to procedures of Item 5.7.
• Automatically clean relay design. Users can set cleaning time and install cleaning equipment by
themselves. Please refer to procedures of Item 5.7.

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• Glass electrode and Metal antimony electrode can be chosen and be used under different industrial
situation and HF measurement situation. Please refer to procedures of Item 5.8.
• During calibrating and setting, hold function freezes output current (0/4 20ma) and releases control
relays.
• LED indicators signal control activities to monitor controller status from a distance.
• Ultraviolet rays proofing, LCE of blue back light (LCD=liquid crystal display)
• RS-485 output can set tandem transmitting rate and ID NO. by itself. Maximum 100 instruments can
be connected with computer to provide convenience management for terminating machine.
2.2 MEASUREMENT AND CONTROL SYSTEM
Typical measurement system includes:
• pH/ORP on-line transmitter
• United or separated temperature sensing instrument Pt1000 of pH/ORP compound electrode.
• 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.
• RS485 can be used as multi-instrument communication.
• RL3 relay can be used as many controller and warning.
+
PHCN-962

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2.3 APPEARANCE
PHCN-962 Wall hanging installation

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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

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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
（If hold on pressing, value changing will be quicker.）
2.3.3 LED Induction
Relay Induction
SP1\SP2 LED show relevant working status of relays.
SP1\SP2LED light-on shows that relays are under working status.
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. Followings are those passwords:
Password Mode / Instruction
028
Calibration Mode
058 Set-up Mode

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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
HOLDHOLD
HOLDHOLD
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

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3 INSTALLATION AND ACCESSORY
INSTALLATION
Wall-hanging installation
113mm
122mm
151mm
(4.449)
(4.803)
(5.945)

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PHCN-962 connection diagram
Warning：Make sure to power off before connecting. The back
panel consists of three connectors.
PHCN-962 series connection diagram
1.Temperature electrode positive
terminal (PT1000) 17. Connect bigger earth wire
2. Temperature electrode negative
terminal (PT1000) 18. Alternating connect earth wire
3. Temperature electrode sensing
terminal (If use two-wire system,
please use short circuit between 2
and 3).
19. Electric source input 110V/220V alternating current
4. COM（short circuit with 5 under
normal status）
pH/ORP input terminal
5. pH negative terminal Jodhpurs JP2 220V
6. REF Jodhpurs JP1 110V
7. pH value 4 —20mA Output,
negative terminal
8. pH value 4 —20mA Output,
positive terminal
9. 485A output
10. 485B output
11. Relay A（SP1）
12. Relay A（SP1）
13. Relay B（SP2）
14. Relay B（SP2）
15. Clearing Relay
16. Clearing Relay
SP1
SP2 RL 3
N
11 0V 220 V
10 09 08 07 06 05 04 03
02
01
485A 485B pH- COM
PT
1 000
REF mA mA
WARNING
pH/ORP INPUT
S/N:
11 12 13 14 15 16 17 18 19
FUSE0.5A
JP2
JPI
110V 220 V
220 V

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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 of ORP under ORP measurement mode. Annunciator at the left
lower side of the display show the value of transmitting output electric
circuit, which as the way that users 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
7.00PH
SPI AT C
mA
250
C
SP2

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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 squares.
4.1 ENTERING CALIBRATION MODE
000
SE T
028
SET
CA
CAL
HOLD
CA L
HOLD
mV
k=
CAL
HOLD
7.00
CAL
HOLD
4.00
CA L
HOLD
7.00
CAL
HOLD
mV
k=
CA
CAL
HOLD
CA
CAL
HOLD
CA
CAL
HOLD
MEA
4.00
PH
SPI ATC
mA
250
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 sensorinto pH7.00 buffer
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 and 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 relevant items.(please refer to
upper pictures).
NOTE：Anytime press to quit calibration mode and return to upper function. If
return 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.

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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℃.You should use those standard buffer solution
which matches above solution when you calibrate the instrument.
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
under current calibrating. 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 permit range of the formality, the instrument will regard
the calibration as a legal 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).

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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 select one point calibration, 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 finish the second calibration of 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.