Zirkon® DIS Total Sensor
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      How to Clean and Calibrate Zirkon® DIS Total sensor (total chlorine)

      Cleaning the Zirkon® DIS Total sensor is required before calibrating and installing the sensor into the flow cell. Follow these steps for proper cleaning and calibration.

      How to Clean and Calibrate TCl sensor

      Note: Video below depicts the Zirkon® Free Chlorine sensor, however, the method of cleaning is the same for the TCl sensor. 

      Cleaning Sensor

      IMPORTANT: Sensors must be cleaned by hand before being inserted into their respective chamber!

      • Remove sensor from assembly and cable
      • Wipe off any pollution with paper tissue, rinse with water
      • Clean metal bands with powder detergent (ex. Comet), making sure NOT to cover the diaphragm with powder detergent. Wipe the metal surface gently.
      • Rinse thoroughly with water and reinstall 
      • IMPORTANT: Wait 20-30 minutes before calibration to allow sensor to polarize! 

       

      Calibrating Sensor

      IMPORTANT: Clean sensor before proceeding with calibration! 

      1. Using water sample taken from Sampling Reference Valve, perform DPD test
      2. Main menu > Cal > Cal DIS > enter DPD reference value > Ok > Save

       

      Note: Sensor life expectancy is water quality and application specific. Best practice suggests annual replacement of process dependent sensors.

       

      Calibration for Total Chlorine Sensors – RO Protection Application

      Start with a clean sensor ​

      1. Materials needed​
      • Paper towel​
      • Granular detergent - Ajax, Comet, or Barkeepers (NO Liquid cleaners!)​
      1. Remove sensor from cable and flow cell​
      2. Wipe off any pollution with paper towel, rinse with water​
      3. Clean metal electrodes with powder detergent and wet paper towel​
      4. Rinse thoroughly before reinstalling​

      Run your calibration​

      1. Start with +20 mV zero-point on RO feed water​
      2. Switch to chlorinated water source ​
      3. Confirm chlorine is present and stable by multiple DPD measurements​
      4. After 3x DPD total handheld measurements enter a "reference measurement" ​
      5. Switch back to RO feedwater

      Validate your calibration​

      1. After sensor has responded to zero-chlorine water, switch back to chlorinated water ​
      2. After chlorine is confirmed to be present by DPD, compare your DPD results to the NTOC Total Chlorine measured value​
      3. Goal is +/- 20% of DPD results​

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      NOTE – Treat it like a field goal. If it's inside the uprights, it's good!