In gases at up to 3 MPa (30 bar)
Teddington, UK — NPL can now offer humidity calibrations and tests in multiple gases at a range of pressures, making measurements more reliable and traceable in real conditions of use across a wide range of applications.
This will allow users to make valid humidity measurements in specific process gases, with confidence that the measurements are selective for water vapour, and that instruments have been tested for cross-sensitivity to gas species or pressure.
Many laboratories can only perform humidity calibrations in air at atmospheric pressure. However, industrial humidity measurements may be at high pressures, or in other gases.
For best validity, humidity calibrations should ideally be in the gas medium of use, because the performance of some hygrometers can depend on gas species and pressure
Example application area: humidity in mixtures of components of natural gas and its alternatives.
Dew-point probes, condensation hygrometers, water vapour spectrometers and other hygrometers can be calibrated.
Calibrations can cover other humidity units directly related to dew point, e.g. vapour pressure, amount fraction, vapour density (g/kg), etc.
To discuss your own requirement, please contact Paul Carroll or their Humidity team.
NPL is the UK’s National Measurement Institute, and is a world-leading centre of excellence in developing and applying the most accurate measurement standards, science and technology available.For more than a century NPL has developed and maintained the nation’s primary measurement standards. These standards underpin the National Measurement System infrastructure of traceability throughout the UK and the world that ensures accuracy and consistency of measurement. NPL ensures that cutting-edge measurement science and technology have a positive impact in the real world. NPL delivers world-leading measurement solutions that are critical to commercial research and development, and support business success across the UK and the globe.
National Physical Laboratory (NPL)
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