Humidity salts

Calibration of humidity-generating salt systems

NPL calibrates capsules, ampoules or other suitable artefacts that use salt solutions or other chemical substances to generate stable values of humidity. Calibration can be performed for:

• Relative humidity range 0.5 %rh to 98 %rh at temperatures from 10 °C to 50 °C (or enquire for temperatures outside this range).

• Both re-usable or single-use types can be calibrated (single-use types by batch calibration).

• Values assigned to a batch of salt capsules or ampoules are based on random sampling from the batch. Uncertainty assigned to a batch value depends on the measurement uncertainty together with the sample size and the variation within the sample.

Find out about NPL’s Relative humidity calibration service

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