pH Controller, Transmit pH/ORP, Water/Food Process

pH/ORP controller can be connected with alarm relays and solenoid valves to form a simple pH/ORP process control system. Digital pH meter can be used with various pH electrodes or ORP electrodes to realize online continuous testing and monitoring of the pH (0~14) / ORP (-1000~1000mV) / temperature (-10~+130℃/14~266℉) of sewage, corrosive solution, liquid medicine, beer, drinking water, food, high temperature sterilization occasions, etc. pH controller transmits standard output signal 4-20mA to digital panel meter/VFD/PLC/recorder, or RS485 signal to computer for remote monitoring and recording.

SKU: CCHN-PHM-PH6

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Delivery date: 6-25 days

Overview

The pH controller is an digital intelligent pH meter for water/food pH value or ORP value testing and monitoring.

Application:
The pH/ORP controller is widely used in the continuous testing and monitoring of pH, ORP and temperature in thermal power, chemical fertilizer, metallurgy, environmental protection, pharmaceutical, biochemical, food, drinking water, etc.

Function:

2.4 inch LCD display
Good anti-interference performance
Manual/automatic temperature compensation
User settings: Language, buzzer, LCD backlight, password, pH/ORP electrode, manual/automatic temperature compensation, pH/ORP calibration, pH/ORP/temperature modification, pH/ORP high/low alarm, output signal 4-20mA and RS485, etc.
Internal industrial watchdog insures pH meter don't crash.

Details

Specification:

Model	CCHN-PHCR-PH6
Dimension	100100150mm (HWD) with hole size 93*93mm
Measuring range	pH: 0~14pH, ORP: -1000~1000mV (-2000~2000mV need customization)
Accuracy	±0.02pH, ±1mV
Resolution	±0.01pH, ±1mV
Stability	≤0.02pH/24h, ≤3mV/24h
Input impedance	≥10^12Ω
Temperature range	-10~+130℃ (NTC 10K or PT1000, accuracy: ±0.5℃)
Temperature compensation	-10~+130℃ manual/automatic
Output signal *	Isolated 4-20mA signal (error: ±0.1%, under maximum loop resistance 750Ω)
Communication function *	RS485 with standard MODBUS-RTU (Now RS485 software is free.)
Power supply	AC110V/AC220V/DC24V
Alarm relay	2 alarm relays: AC 250V/3A Function: high alarm, low alarm
Weight	1kg

The pH meter and pH/ORP electrode selection:

pH meter	pH/ORP electrode	Industry	Temperature range	Advantage
CCHN-PHCR-PH6	Combination pH electrode	Sewage disposal	0-60℃ (32-140℉)	Combination electrode has automatic temperature compensation function, suitable for occasions with large temperature fluctuations.
	Pure water pH electrode	Drinking water	0-60℃ (32-140℉)	The pH calomel electrode can be used in strong acid or alkali.
	PTFE pH electrode	Chemical	0-60℃ (32-140℉)	The electrode shell is made of PTFE, suitable for corrosive solution (strong acid or alkali), has longer life in harsh environments.
	pH glass electrode	Sewage disposal / food	0-95℃ (32-203℉)	Direct lead, double-layer glasses.
	Desulfurization pH electrode	Desulfurization	0-60℃ (32-140℉)	Flat electrode, strong anti-pollution ability and longer life
	High temperature/sterilization pH electrode	Food	0-130℃ (32-266℉)	The electrode can withstand high temperature of 0-130℃, suitable for occasions of high temperature sterilization in pharmaceutical factories, breweries, etc.
	High pressure/accuracy pH electrode	Laboratory	0-80℃ (32-176℉)	Its linearity and accuracy are higher than all above electrodes.

Wiring diagram:
PH controller wiring diagram
Definition of the ports:

INPUT: Measuring terminal of the electrode
REF: Reference terminal of the electrode
NC: Undefined
A: Temperature compensation terminal A, connect to NTC 10K or PT1000
B: Temperature compensation terminal B, connect to NTC 10K or PT1000
C: Temperature compensation terminal C, connect to 3-wire PT1000 GND (3-wire PT1000), or connect to B (2-wire PT1000), or NC (NTC 10K)
RS485 (A+): RS485 communication interface A+
RS485 (B-): RS485 communication interface B-
4-20mA (+): 4-20mA output terminal +
4-20mA (-): 4-20mA output terminal -
AC 220V/110V (L) or DC 24V (-): AC 220V/110V live wire or DC 24V (-)
AC 220V/110V (N) or DC 24V (+): AC 220V/110V neutral wire or DC 24V (+)
HO: Normally-open relay for high alarm
HC: Normally-closed relay for high alarm
LO: Normally-open relay for low alarm
LC: Normally-closed relay for low alarm
COM: Common terminal

Communication:
RS485 communication data and register address as follows:

Address	Data type	Function code	Explanation	Access right
0x0000	unsigned short	0x03	PH value (default in two decimals)	Read only
0x0001	unsigned short	0x03	Temperature value (default in one decimals)	Read only
0x0002	short	0x03	ORP value (signed integer)	Read only

Tips: Different types of pH meters

Pen type (mini) pH meter and portable pH meter are generally used by testing personnel on site. Portable pH meter and benchtop pH meter are common instruments with wide measuring range, the difference is that portable pH meter uses the DC power supply, so it can be taken to work field. Laboratory pH meter has wide measuring range, various functions and high measurement accuracy.
Industrial online pH meter is more stable and reliable and have a certain measurement accuracy, strong environmental adaptability and strong anti-interference ability, as well as functions of analog output, digital communication, upper and lower limit alarm, control function, etc. For a measurement at 20～30℃ and pH value 7, there is no need temperature compensation. For a measurement at a temperature above 30℃ or below 20℃ while the pH value is higher than 8 or lower than 6, temperature variation must be compensated.