Calibration and Standard Solutions Guide
Understand calibration points, standard selection, contamination control, storage and verification for reliable digital measurements.
Practical guidance
Calibration compares the instrument response with known reference values. Choose standards that bracket or are close to the sample range. Pour only the quantity required, never return used solution to the bottle, keep containers tightly closed and avoid cross-contamination from wet electrodes. Record standard lot, value, temperature and calibration result. Replace standards that are expired, contaminated or repeatedly exposed.
Recommended routine
- Review the product manual and required standards.
- Inspect the instrument, cables and sensor condition.
- Calibrate at suitable points using fresh standards.
- Rinse and condition the sensor before measuring.
- Allow the reading to stabilise without contaminating the sample.
- Record the result together with temperature and calibration status.
- Clean and store the sensor correctly after use.
Frequently asked questions
How often should an instrument be calibrated?
Calibration frequency depends on sensor stability, application risk, sample type and quality procedure. Critical measurements may require calibration before each batch or shift.
Can the same sensor be used for every sample?
No. Sensor material, range, temperature and chemical compatibility must match the sample and application.
When should a reading be confirmed?
Confirm readings that are unexpected, safety-critical, near a specification limit or inconsistent with process conditions.