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What factors should be considered on the selection of the conductivity sensor?

What factors should be considered on the selection of the conductivity sensor?

  1. Sensor material: 
    Sensor materials are very significant; the insulator between the two electrodes must not deteriorate over time. For example, when measuring in Ultra-Pure Water (UPW) is being made at 18MΩ: any of the insulation degradation would result in higher than actual conductivity measurement.
     
  2. Compatibility with the process:
    All the materials must be compatible with the process. They must not rust, swell, shrink, etc.
     
  3.  Robustness:
    The sensor must be as strong and robust as possible. The geometric dimensions between the two electrodes are critical: any change will significantly impact the conductivity reading.
     
  4. Temperature sensor accuracy:
    The temperature sensor must be of high quality; a one °C error could result in a 10% conductivity error.

 

For detailed information please check our Technical Information: Contacting Conductivity sensor selection guide. 

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