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Water Quality Quality pH Sensor

SKU: SEN0708

This industrial-grade water pH sensor integrates probe and housing for simplicity. It measures 0-14pH (0.01 resolution, ±0.15 accuracy), features RS485/Modbus-RTU, built-in temp sensor with auto compensation. Factory-calibrated (ready to use), supports 2-point calibration later. IP68 waterproof, suitable for wastewater, aquaculture, water quality monitoring. Probe cap has 3.3mol/L KCL (minor leakage/crystals don’t affect performance).

Downloadable Resources

  • Docs
  • Tech Specs

    • 1. Getting Started

    This comprehensive guide on pH sensors covers essential tips on calibration, proper handling, installation methods, and maintenance to ensure optimal performance and accuracy.

    2. Example Code for Arduino-PH and Temperature Monitoring

    This project demonstrates how to connect the RS485 Water Quality pH Sensor to an Arduino development board, set up a testing environment, and realize real-time monitoring of pH and temperature data. You will learn how to communicate with the sensor using the Modbus-RTU protocol via RS485, read measurement data, and display it on the serial monitor.

    Reference

    This article delves into the intricacies of the Modbus-RTU communication protocol used with RS485 interfaces, detailing data formats, register addresses, and practical examples for sensor reading and calibration. It includes comprehensive instructions on modifying device addresses and baud rates, making it an essential guide for efficient communication setup.

    Specification

    Parameter Value
    Power Supply Voltage 10~30V DC
    Power Consumption 0.4W
    Communication Interface RS485 (Standard ModBus-RTU protocol)
    Measurement Range pH: 0~14 pH; Temperature: 0°C~+60°C
    Measurement Accuracy pH: ±0.15 pH; Temperature: ±0.5°C
    Resolution pH: 0.01 pH; Temperature: 0.1°C; Repeatability Error: ±0.02 pH
    Temperature Compensation Range 0°C~+60°C
    Response Time <1S
    Operating Temperature 0°C~+80°C
    Waterproof Rating IP68
    Pressure Resistance 0.6MPa
    Cable Length 5m
    Housing Material Corrosion-resistant plastic

    Pinout

    Board Overview

    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

    Dimensional Drawing

    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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