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  • pH automatic control liquid addition system
    pH automatic control liquid addition system
    SC-500A Max pH Automatic Control Liquid Addition System
    This instrument is a new type of automated control system that integrates pH value online display, measurement, and automatic adjustment of acid/alkali solution. Widely used in places where pH value n
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    This instrument is a new type of automated control system that integrates pH value online display, measurement, and automatic adjustment of acid/alkali solution. Widely used in places where pH value needs to be controlled and adjusted, such as laboratory researchers monitoring and controlling the acidity and alkalinity of solutions in various reaction vessels, reaction tanks, biochemical containers, catalytic fields, and bioreactors.

    This system is the latest third-generation high-precision pH automatic control system developed by the R&D team of Changsha Sichen Instrument. It is carefully designed and manufactured for universities, research institutes, laboratories, domestic and foreign R&D enterprises, and R&D production departments, and has completely independent intellectual property rights. Obtained one national invention patent (ZL201410349779.8) and multiple utility model patents (ZL201721373766.X); 【ZL 201420406067.0】; 【ZL201420406055.8】。 The whole machine adopts PLC control and is connected with a customized peristaltic pump to automatically adjust the preset pH value of the solution in the container by adding acid or alkali. It is an ideal pH monitoring and automatic control system for laboratories such as catalysis, pharmaceuticals, chemical engineering, electroplating, biochemistry, biological fermentation, plant extract workshops, scientific institutes, or small production test sites.


    1. Working power supply: AC220V ± 10%/50Hz

    2. Control method: PLC

    3. Control range: 0-14pH

    3. Measurement accuracy: ± 0.05pH

    4. Resolution: 0.01pH

    5. Pump head speed: 0.2-600rpm

    6. Display: 7-inch touch screen

    7. Liquid addition rate: 0.355-2000ml/min (17 # tube)

    8. Temperature compensation: automatic temperature compensation (optional)

    9. PH upper and lower limits: freely set

    10. PH electrode suitable temperature: 0-80 ℃ (optional high temperature up to 135 ℃)

    11. PH standard buffer powder: 4.01/6.86/9.18

    12. Dimensions: 450 * 370 * 240mm

    13. Environmental temperature: Room temperature~45 ℃

    14. Relative humidity:< 80%

    15. Whole machine weight: approximately 9.5kg


    1. This product integrates pH detection, display, and automatic liquid addition, and can adjust the pH of the solution through static or online detection.

    2. It can control the addition of test solution based on pH value, and the peristaltic pump can also operate independently for other titration experiments.

    3. Touch integrated high-definition display screen, Chinese operation interface, dynamically simulating real-time images, displaying set values and measured values simultaneously.

    4. Adopting iterative PLC control, precise control of the speed of the liquid pump is achieved to ensure the accuracy of pH replenishment.

    5. It has multiple control measurement modes: automatic, manual, stop and other liquid addition functions, which can be freely switched.

    6. Low impedance high-precision customized pH composite electrode with fast response, suitable for pH monitoring under various working conditions.

    7. The stepper motor controls the peristaltic pump to add liquid, with good controllability. The neutralizing medium only contacts the pump tube and does not touch the pump body, resulting in no pollution.

    8. The liquid conveying hose with strong acid and alkali resistance is connected to the imported pump pipe to form a sealed pipeline, which has a long service life.

    9. The pH measurement and control accuracy is high, and the flow rate can be automatically adjusted. Users can set the appropriate flow rate according to the usage process.

    10. It can avoid the physical harm caused by organic solvents to experimental personnel when adjusting the solution, and also improve work efficiency.

    11. Real time pH monitoring data and change curves can be viewed, and historical data can be exported with a USB interface.

    12. Real time display of the flow rate, current temperature, and simulation animation of the pumped neutralizing liquid can be achieved by switching between different modes.


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