pH Calibration
The ever-changing nature of the electrochemical pH measurement requires that periodic calibration of the sensor is performed. The topic of calibration inevitably creates questions about the frequency and the procedure required to ensure the accuracy of the pH measurement. The articles below provide some best practices related to pH calibration along with some common problems that a user should be aware of to avoid measurement problems.
The pH Calibration Procedure
This article provides some general guidelines for a pH calibration on a laboratory pH meter or industrial transmitter. The article provides best practices for sensor and liquid buffer solution handling.
pH Calibration Frequency
Since pH sensors experience ageing over their lifespan, calibration frequency is often a question. This article looks at the related variables that can increase or decrease calibration frequency to help decide what best practice to adapt.
Response Time
This article explores the typical response time of a pH sensor and looks into the factors that may lengthen response time. Finally there are some suggestions on how to improve the response time of a pH sensor.
pH Calibration Problems
There are three common problems that occur during pH calibration: Zero Point issues, Slope issues, and response time issues. This article looks at various pH calibration problems that lead to these issues.
pH Accuracy
What pH accuracy can one expect from the sensor? Accuracy is influenced by calibration procedure, temperature influences, health of the measurement and reference electrode, and the age of the sensor itself.
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