Wet gas meter calibration

Wet gas meter calibration is the process of verifying the volumetric accuracy of a liquid-sealed drum meter against a traceable reference standard. Because wet gas meters are themselves often used as reference instruments, their own calibration is particularly important for maintaining the traceability of downstream measurements. UKAS calibration provides a certificate with the calibration results and measurement uncertainty, confirming the meter’s accuracy and traceability.

Wet gas meters offer inherently high accuracy because the measurement mechanism — liquid displacement in precision compartments — has very low systematic error and is largely independent of gas properties. This makes them well suited for use as working reference standards in flow calibration rigs, and for verifying other flow meters. UKAS calibration of the wet gas meter itself ensures the reference is traceable to national standards.

Wet gas meters used as reference instruments in calibration work should typically be calibrated annually. The calibration interval should reflect the consequences of drift and the criticality of the measurements relying on the meter. In high-accuracy calibration laboratories, some organisations calibrate reference-grade instruments more frequently and maintain before-and-after records to detect any change in performance.

Both measure cumulative gas volume, but they use different mechanisms. A wet gas meter uses a liquid-sealed rotating drum and is generally more accurate, making it suitable for use as a reference instrument. A dry gas meter uses bellows or diaphragm chambers and is more commonly used for general gas metering and environmental sampling. Wet gas meters require the liquid level to be maintained and are less portable than dry gas meters.

Yes. Labcal holds UKAS accreditation under ISO/IEC 17025:2017 and our wet gas meter calibrations are traceable to national measurement standards. If you require calibration to a specific environmental monitoring standard or regulatory protocol, contact us to confirm that our scope of accreditation covers your requirements.