Pressure Calibration.

UKAS pressure calibration means your pressure instrument is calibrated by a laboratory independently assessed and accredited by the United Kingdom Accreditation Service to ISO/IEC 17025:2017. The calibration compares the instrument’s readings against a traceable pressure reference standard to establish the measurement error and uncertainty at defined points across the working range.

Labcal’s UKAS-accredited pressure calibration covers 0 to 1,400 bar (0 to 140 MPa, 0 to 20,000 psi) for general pressure instruments. We also hold specialist accreditation for low and differential pressure calibration from 0 to 9,000 Pa. The low-pressure capability requires dedicated reference equipment and is not available from all UKAS laboratories. If your instrument falls outside these ranges, contact us to discuss suitability.

Gauge pressure is measured relative to atmospheric pressure and is the most common type for process gauges and industrial instruments. Absolute pressure is measured relative to a perfect vacuum and is used where atmospheric variation would affect the measurement. Differential pressure measures the difference between two pressures, neither of which is necessarily atmospheric. Labcal calibrates all three measurement types within its UKAS accreditation scope.

Calibration intervals for pressure instruments should be determined based on the criticality of the measurement, application requirements, historical stability and any applicable regulatory or safety standards. Annual calibration is commonly adopted for many industrial applications, although shorter or longer intervals may be appropriate depending on instrument performance and operating conditions.

Yes. If an instrument is found to be outside tolerance during calibration, we will record the as-found condition on the calibration certificate. Where adjustment is technically possible, we can carry out adjustment and then re-calibrate to confirm the as-left condition. Where adjustment is not possible (for example, sealed mechanical gauges), we will advise on whether the instrument should be replaced. We can also issue an as-found certificate if you need documentary evidence of the instrument’s condition before adjustment.