How often should the salt bridge and standard cell solution of a differential pH or ORP sensor be changed?

Document ID

Document ID TE2055

Version

Version 5.0

Status

Status Published

Published Date

Published Date 03/06/2019
Question
How often should the salt bridge and standard cell solution of a differential pH or ORP sensor be changed?
Summary
pH/ORP sensor maintenance information
Answer
We recommend changing the salt bridge and standard cell solution at least one time a year in a typical application. The actual frequency may be more often and is process dependent. This prevents the standard cell solution from becoming contaminated, which can cause an offset in the sensor signal and increased difficulty in calibration.

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