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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

Don’t see what you are looking for? Our diverse skill set enables us to provide bespoke solutions. Please contact us to discuss your requirements.

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