Calibration techniques - pH meter (How to do proper calibration)?

pH meter Calibration Techniques

Incorrect calibration is a major contributor to error found in measurement.

Proper technique may vary from process to process.

Some of the inproper calibration are listed below. -Temperature equilibrium -Inadequate stabilization of measurement -Inadequate rinsing of probes -Reference electrode contamination -Buffer or standard contamination -Aging probes replaced -Temperature error

Buffer related pH calibration problems are listed below -

-Aging -Different temperatures -Mixing -Contamination -Changing junction potential -Streaming potential -It can take 45 minutes to 1 hour for a good industrial pH sensor to reach equilibrium -45 minutes to 2 hours to buffer calibrate a hot pH sensor.