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Water Quality Residual Chlorine Sensor

SKU: SEN0712

This industrial-grade residual chlorine sensor integrates probe and housing for a lightweight, user-friendly design. It accurately measures residual chlorine (0~10 mg/L range, 0.01 mg/L resolution, ±5%FS accuracy) in water. Equipped with RS485 (ModBus-RTU), it supports Arduino/LoRaWAN connections via tutorials for quick setup and real-time monitoring. Factory-calibrated, no secondary calibration needed. IP68 waterproof for extended underwater use, ideal for tap water, drinking water, and swimming pool applications. Note: Probe cap contains 3.3mol/L KCL; slight leakage/crystals are normal if liquid remains.

Downloadable Resources

  • Docs
  • Tech Specs

    • Specification

    Parameter Value
    Power Supply Voltage 10~30V DC
    Power Consumption 0.2W
    Communication Interface RS485 (Standard ModBus-RTU Protocol)
    Measurement Range 0~10mg/L
    Measurement Error ±5%FS
    Repeatability Error ±0.05mg/L
    Resolution 0.01mg/L
    Response Time <30S
    Operating Temperature 0°C~+50°C
    Waterproof Rating IP68
    Pressure Resistance 0.6MPa
    Cable Length 5m
    Housing Material Corrosion-resistant Plastic

    Pinout

    Num Label Description
    Brown line VCC Power input positive pole, DC10-30V power supply
    Black line GND Power ground wire
    Yellow line 485-A RS485 data line A
    Blue line 485-B RS485 data line B

    FAQ

    • How to troubleshoot when there is a problem?
      1. The computer has multiple COM ports, and the selected port is incorrect.
      2. The device address is wrong, or there are devices with duplicate addresses (all factory defaults are 1).
      3. Baud rate, check mode, data bit, stop bit error.
      4. Host polling interval and waiting response time are too short, both need to be set above 200ms.
      5. 485 bus is disconnected, or A and B lines are connected in reverse.
      6. Too many devices or too long wiring, power supply should be provided nearby, 485 enhancer should be added, and 120Ω terminal resistance should be added.
      7. USB to 485 driver is not installed or damaged.
      8. Equipment is damaged.

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