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    Digital pH Meter for Water/Food

    Buy a smart industrial pH controller online, digital pH/ORP meter can be connected with a digital panel meter/VFD/PLC/recorder (4-20mA output) or with a computer for remote monitoring and recording (RS485 communication, the pH meter is ideal for testing the pH, ORP and temperature values of water or food.
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    🔙 30-day returns
    📅 Delivery: 7-12 days

    Digital pH/ORP meter has good anti-interference, manual/automatic temperature compensation function, which can be matched with various pH electrodes or ORP electrodes to realize online testing and monitoring of pH of sewage, corrosive solution, liquid medicine, beer, drinking water, food, etc.

    Digital pH meter

    Watchdog protection system, strong anti-interference ability

    • 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.



    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.

    pH meter applications

    Model SISCO-PHCR-PH8.0
    Weight 1kg
    Dimension 144*144*115mm (H*W*D) with hole size 138*138mm
    Display 4.3 inch LCD color screen
    Measuring range pH: -2.00 ~ +16.00pH
    ORP: -1999 ~ +1999mV
    Temperature: -10.0 ~ +130.0℃
    Accuracy pH:
    pH sensor: ±0.02pH
    Antimony pH sensor: ±0.2pH
    ORP: ±0.1%FS
    NTC10K: ±0.3℃ (-10~+60℃), ±2.0℃ (60~130℃)
    PT1000/PT100: ±0.3℃
    Input impedance ≥10^12Ω
    Temperature range 0~100℃ (NTC 10K, accuracy: ±0.5℃)
    Temperature compensation NTC10K/PT1000, manual/automatic
    Record 100 sets, recording interval can be set through configuration, the recording method is FIFO.
    Output signal * Isolated 4-20mA signal (error: ±0.2%, under maximum loop resistance 750Ω), default 1 * 4-20mA output, optional 2 * 4-20mA outputs
    Communication function RS485 with standard MODBUS-RTU (Now RS485 software is free.)
    Power supply AC 100~240V, 50Hz/60Hz, 5W Max.
    Alarm relay 2 alarm relays: AC 245V/5A Max., NO
    Function: high alarm, low alarm
    Protection class IP65
    Operating temperature 0~60℃
    Storage condition Temperature: -20~+70℃
    Humidity: 10~85%RH (No condensation)
    Automatic cleaning * Manually clean, set cleaning interval

    The pH meter and pH/ORP electrode selection

    pH meter pH/ORP electrode Industry Temperature range Advantage
    SISCO-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.

    Wiring diagram:

    Digital pH meter wiring- iagram

    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


    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

    Q1: What is the working principle of a pH meter?
    A1: The pH meter works on the principle of a galvanic battery. The electromotive force between the two electrodes of the galvanic battery is based on Nernst's law, which is not only related to the properties of the electrodes, but also to the concentration of hydrogen ions in the solution. There is a the corresponding relationship between the electromotive force of the primary cell and the hydrogen ion concentration, and the negative logarithm of the hydrogen ion concentration is the pH value.

    Q2: The same sample is measured on two pH meters at the same time, why are the readings inconsistent?
    A2: Because the calibration conditions of the two pH meters are different (such as calibration done at different times), the measured values are different. Therefore, the pH meter should be calibrated at the same time with the same buffer, and then measured at the same time.

    Q3: How do I know if the pH meter is accurate?
    A3: Take three standard buffer solutions: pH 6.86, pH 4.00, pH 9.18 (preferably freshly prepared and at the same temperature), position calibration at pH 6.86, slope calibration at pH 4.00, and then test pH 9.18 to know the pH meter Is it accurate.

    Tips: What types of pH meters are there?

    Pen (miniature) pH meters and portable pH meters are generally used on-site by testing personnel. Portable pH meters and benchtop pH meters are common instruments with a wide range of measurements. The difference is that portable pH meters use DC power and can be brought to the job site. Laboratory pH meters have a wide measurement range, versatility and high measurement accuracy.

    The industrial-grade online pH meter is more stable and reliable, has certain measurement accuracy, strong environmental adaptability, strong anti-interference ability, and also has functions such as analog output, digital communication, upper and lower limit alarms, and control functions. Measured at 20-30°C and pH 7, no temperature compensation is required. For measurements where the temperature is above 30°C or below 20°C and the pH is above 8 or below 6, compensation for temperature changes must be made.


    Thank you for buying industrial test and measurement equipment on, all products sold by SISCO and the partner cover a 12 months warranty, effective from the date of receiving the products.

    What is covered?

    SISCO is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

    What is not covered?

    • Product purchased from anyone other than a SISCO store or a SISCO authorized reseller.
    • Expendable parts.
    • Routine cleaning or normal cosmetic and mechanical wear.
    • Damage from misuse, abuse or neglect.
    • Damage from use of parts other than SISCO approved.
    • Damage from use outside the product’s usage or storage parameters.
    • Damage from use of parts not sold by SISCO.
    • Damage from modification or incorporation into other products.
    • Damage from repair or replacement of warranted parts by a service provider other than a SISCO authorized service provider.
    • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
    5.0 3
    Write your own review Close
    Sue | 8/21/2023 11:59 PM
    Easy for me to use
    This pH meter is easy to use. It has worked well so far. Overall, a good starter pH meter. I would purchase it again and recommend this one to my friends!
    Glenda | 3/6/2023 6:49 PM
    For my hydroponic planting
    This digital pH meter was a great product and seemed very accurate. I know how I need to adjust my water for my hydroponic plantings. Highly recommended!!!
    Brooks | 2/28/2023 5:19 PM
    I am extremely impressed with the digital pH meter
    Digital pH meter is so easy to use and provides accurate readings every time. The large, clear display makes it easy to read even in low light conditions. I've been using it to test the pH of my hydroponic nutrient solutions and it's been a game-changer.