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