How to Clean and Calibrate your Zirkon® pH Sensor

It is important to clean your pH sensor prior to calibration and installation. Follow the steps for proper cleaning and calibration procedure.

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
- NEVER use abrasive substances (e.g. powder detergent) on glass bulb!
- Use mild acid (dilute HCl) to remove stains, use alcohol to remove organics
- Rinse with water and reinstall


Calibrating Sensor

pH Calibration UT V2
  1. Main Menu > Cal > Cal pH
  2. Calibrate sensor with pH 7 buffer solution followed by pH 4 buffer solution, being sure to leave the sensor in each buffer solution before pressing "OKAY" to move on to the next step.

    Important: Rinse the probe with water and pat dry between buffer solutions to prevent cross contamination.
  3. Save results

Factors Influencing Calibration

1. Conductivity - the pH sensor uses an electrical measurement, which requires a minimum conductivity. In the presence of low conductivity this could cause inaccurate calibration values. 

2. Age/contamination of buffer solutions - When calibrating pH, never reuse buffer solutions, and always rinse the probe and pat it dry between buffers.

3. Temperature - pH calibration is temperature-dependent. Allow the sensor to sit a few minutes in the buffer solution before starting the calibration. This allows the sensor to match the temperature of the buffer solution. 

Helpful article: Krypton® Multi Calibration Menu

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