Our partners at Qrometric have crafted he world’s first self-contained transportable dew-frost point calibrator.
The FPG enables precise test and calibration of dew point sensors, moisture analysers and most types of hygrometer. Compact and transportable, FPG is suitable for use in the laboratory and on-site.
Features:
Applications:
The heart of the FPG is a temperature controlled humidity saturator that generates a stable water vapour pressure (dew point, moisture) within a closed loop. An integrated sample pump maintains a continuous flow through the saturator, the instruments under test and the external sample loop. At equilibrium, the saturator temperature and system pressure resolve a dew point or moisture reference condition to which sensors, probes or analysers can be compared and calibrated.
FPG can stabilise dew point values in minutes. The recommended calibration process is to start with the lowest dew point, then to step up in fixed increments to the final value. If required, the same points can be easily repeated to establish reproducibility.
Accredited calibration is always based on an uncertainty budget that can be audited by an assessor. In collaboration with the NPL in London, an uncertainty framework has been developed, so that users can quickly calculate and document the calibration uncertainty with or without the use of a transfer standard.
Universal Compatibility
FPG has been developed to be compatible with all types of humidity-moisture instruments. The front panel probe ports can be easily configured to suit any type of dew point sensor. External sample loop connections with Swagelok® fittings are included as standard. This enables transfer standards or instruments under test to be connected to the FPG controlled dew point sample loop.
The FPG control system is based on an embedded PC with an SSD and a touchscreen user interface. USB peripherals, such as keyboard and mouse, can be connected through the integrated USB hub.
Third-party solutions such as Calibry metrology software or manufacturer probe calibration software are available to work in conjunction with the FPG.
The fundamental physics at the heart of the FPG means it can be used for traceable calibration without the need for a transfer standard hygrometer. However, as is the case in temperature calibration, a reference measurement is often used to improve confidence and reduce uncertainty. For this reason, FPG includes external sample loop fittings so the user can validate performance at any time by connecting a reference instrument such as a dew point mirror.
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