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    Digital pH/ORP Meter for Water Testing

    Digital pH/ORP meter is a cheap online pH/ORP controller. The pH/ORP meter can be used in various severe environment. It is used to test and monitor the pH (0~14) / ORP (-1000~1000mV) / temperature (0~100℃/32~212℉) of sewage, corrosive solution, liquid medicine, beer, drinking water, food, etc. The pH controller transmits standard output signal 4-20mA to digital panel meter/VFD/PLC/recorder, or RS485 signal to a computer for remote monitoring and recording.
    Free Shipping Worldwide
    Delivery date: 6-12 days

    Digital pH/ORP meter is an industrial pH/ORP meter for water/food pH value or ORP value testing and monitoring.

    Digital pH/ORP meter 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 doesn't crash.


    Model ATO-PHCR-PH160
    Weight 1kg
    Dimension 96*96*100mm (H*W*D) with hole size 92*92mm
    Measuring range pH: 0~14pH, ORP: -1000~1000mV (-2000~2000mV can be customizable)
    Accuracy ±0.02pH, ±1mV
    Resolution ±0.01pH, ±1mV
    Stability ≤0.02pH/24h, ≤3mV/24h
    Input impedance ≥10^12Ω
    Temperature range 0~100℃ (NTC 10K, accuracy: ±0.5℃)
    Temperature compensation 0~100℃ manual/automatic
    Output signal Isolated 4-20mA signal (error: ±0.2%, under maximum loop resistance 750Ω)
    Communication function RS485 with standard MODBUS-RTU (Now RS485 software is free.)
    Power supply AC 220V±10%, 50Hz/60Hz
    DC 24V
    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-PH160 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.

    The pH/ORP meter diagram of ports definition:
    Digital pH/ORP meter wiring diagram

    • INPUT: Measuring terminal of the electrode
    • REF: Reference terminal of the electrode
    • NC: Undefined
    • TEMP2: Temperature compensation terminal 2
    • TEMP1: Temperature compensation terminal 1
    • 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 (L) or DC 24V (-): AC 220V liver wire or DC 24V negative
    • AC 220V (N) or DC 24V (+): AC 220V liver wire or DC 24V positive
    • LO: Normally-open relay for low alarm
    • HI: Normally-closed relay for high alarm

    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: Why should the pH meter be recalibrated?
    After the calibration is completed, the frequently used pH meter does not need to be calibrated again within 48 hours. In case of any of the following situations, the meter needs to be recalibrated:

    1. There's a huge difference between solution temperature and calibration temperature.
    2. The electrode has been exposed in the air for too long, such as more than half an hour.
    3. Position or slope adjuster is moved by mistake.
    4. Peracid solution (pH<2) or overbasic solution (pH>12) is measured.
    5. The electrode is replaced.
    6. pH value of the measured solution is not in the middle of the calibrated value for two points while it's far from 7pH.
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