Humidity Calibration.

UKAS humidity calibration means your humidity instrument is calibrated by a laboratory independently assessed and accredited by the United Kingdom Accreditation Service to ISO/IEC 17025:2017. Calibration is performed in controlled environmental chambers where the temperature and humidity are held at defined reference conditions using traceable standards. The certificate records the actual humidity error at each calibrated point.

Labcal’s UKAS-accredited humidity calibration covers 10% to 90% relative humidity at temperatures from +15°C to +40°C, and 15% to 90% RH between +10°C and +15°C. Temperature probes built into humidity instruments can also be calibrated for temperature in our environmental chambers from -5°C to +60°C. Calibration is performed within controlled environmental chambers to ensure stable and repeatable reference conditions. If your instrument requires calibration outside these ranges, contact us and we will advise on whether your requirement can be accommodated.

Labcal calibrates hygrometers, humidity transmitters, combined temperature and humidity probes, dew point sensors, environmental data loggers and relative humidity controllers. We routinely calibrate instruments from manufacturers including Rotronic, Testo, Vaisala, Michell Instruments, TSI Instruments and Fluke, among others. If your instrument type or manufacturer is not listed, contact us and we will confirm suitability.

In pharmaceutical manufacturing environments where humidity is a critical GMP parameter, annual calibration is commonly adopted. For HVAC and cleanroom applications, annual calibration aligned with the facility’s environmental monitoring schedule is typical. The calibration interval should be defined by your quality management system based on the criticality of the measurement, the instrument’s accuracy requirements and any drift observed in previous calibration records.

Unlike pressure or temperature calibration, which can be achieved by applying a known reference condition to the instrument directly, humidity calibration requires the instrument to be exposed to a controlled environment with a stable, known relative humidity. Labcal uses environmental chambers where both temperature and humidity are held at defined reference conditions using traceable standards. This approach ensures the calibration reflects real-world operating conditions and produces results that are accurate, repeatable and fully traceable.