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

    5 out of 5 based on 4 reviews | Write a review
    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.
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    Delivery date: 6-12 days

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

    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.


    • 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.


    pH Meter Details


    Model ATO-PHCR-PH6
    Weight 1kg
    Dimension 100*100*150mm (H*W*D) 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 AC 220V±10%, 50Hz/60Hz
    Alarm relay 2 alarm relays: AC 250V/3A
    Function: high alarm, low alarm

    The pH meter and pH/ORP electrode selection:

    pH meter pH/ORP electrode Industry Temperature range Advantage
    ATO-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:
    PH controller ports definition

    • 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

    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.

    Existing reviews of pH Controller, Transmit pH/ORP, Water/Food Process
    Very useful ph controller
    We use the controller to detect cosmetics. Very useful ph controller. The readings are accurate and reliable. It works very well. I will buy again.
    From: Leo | Date: 13/04/2022
    Was this review helpful? Yes No (0/0)
    Relaible product
    I have chosen and bought this pH/ORP controller for a month now and it has been very accurate and dependable. I connect this PH meter with an alarm in order to warn us the problem of industrial waste. It's really nice that help us avoiding a lot of trouble. Relaible product!
    From: Morris | Date: 10/03/2019
    Was this review helpful? Yes No (0/0)
    Good stability and sensitivity
    Digital pH controller is very easy to use. I have used it to measure pH value of sewage water for a period of time. The stability and sensitivity of pH controller is still very good.
    From: Logan | Date: 25/10/2018
    Was this review helpful? Yes No (0/0)
    Multifunctional pH controller
    The appearance of the pH controller is very nice. The display screen is very large and clear. The actual operation is simple and convenient, and the high and low alarm setting values can be queried on the display interface. Overall, the digital pH/ORP controller is multifunctional, and it can be used not only on its own but also for remote monitoring. When it is debugged in the laboratory, its stability is good, and the high and low alarms are also very accurate. Now the ph controller works well with the equipment.
    From: Cameron | Date: 19/09/2018
    Was this review helpful? Yes No (0/0)
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