NPL operates a multi-gas, multi-pressure primary standard humidity generator which has been developed in-house.
Full range options
Humidity calibration can be performed in air, nitrogen, inert gases, methane, hydrogen, natural gas components including mixtures blended in the laboratory or pre-made cylinder gas mixtures, and at pressures from 0.1 MPa to 3 MPa (1 bar to 30 bar):
In a sub-range
Humidity calibration in air or nitrogen, in pressure sub-range 0.1 MPa to 1 MPa (1 bar to 10 bar):
Additional services
As well as calibration of hygrometers, traceable to the SI, NPL’s multi-gas multi-pressure humidity facility can also provide a versatile test capability for different aspects of hygrometer performance.
Wider services offered using this facility include research and independent testing for manufacturing, energy, oil and gas, in areas such as:
Industrial humidity measurements are made in a wide variety of conditions. But some hygrometer types can be influenced by background gas composition or pressure. These sensitivities are not revealed in typical calibrations carried out in air, near atmospheric pressure. NPL can provide specialised traceable calibration of humidity instruments in the gases and pressures relevant to use, eliminating errors associated with interference of the gas species and pressure dependence. The resulting confidence in the instrument response can improve process control, save money and energy, and improve product quality and safety.
Are you interested in moisture in materials?
Humidity calibrations in air, with smaller uncertainties
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.
Our research and measurement solutions support innovation and product development. We work with companies to deliver business advantage and commercial success.
Contact our Customer Services team on +44 20 8943 7070