WP
4
PotentiaMeter
Calibration and Verification Standards
26
potential. The potassium chloride (KCl) verification
standards are accurate, easy to use, and readily
available from Decagon Devices. Most importantly,
they greatly reduce preparation errors. Because of
these reasons, we recommend using Decagon’s KCl
Performance Verification Standard for the most
accurate verification of your WP4’s performance.
The standards are produced under a strict quality
assurance regime. The accuracy of the standards is
verified by an independent third party and are shelf
stable for one year. If for some reason you cannot
obtain Decagon’s verification standards and need to
make a saturated salt solution for verification, refer
to Appendix A.
When to Verify Calibration
The calibration of your WP4 should be checked
with the KCl standard before each use. It should
never be checked by measuring distilled water. The
WP4 will read distilled water, but it is not a good
choice for checking calibration, since as the humid-
ity of the chamber approaches 100%, the sensor
may be adversely affected. For batch processing,
the instrument should be checked regularly against
the KCl standard. This will alert you to the possibil-
ity of contamination of the unit or shifts in the cali-
bration from other causes.
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