Generating stable values of humidity using 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 of humidity-generating salt systems:

  • 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 more about NPL’s Relative humidity calibration

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