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Qrometric FPG 

  • Primary saturator humidity generator – fundamental precision

  • Transportable – suitable for use in the laboratory or on-site

  • Self-contained – no need for external services

  • 0… -100 °C dew point – covers the working range of most DP instruments

  • Three configurable probe ports – compatible with all types of dew point probe

  • Programmable presets – quick and easy running of common processes

  • Transfer standard sample loop – connection of a reference instrument

  • Moisture Analyser connection – enables calibration of all types of hygrometer

Based on control and measurement of temperature and pressure, 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.

THE WORLD’S FIRST SELF-CONTAINED PORTABLE DEW-FROST POINT CALIBRATOR

FUNDAMENTAL PRECISION
The heart of the FPG is a temperature-controlled saturator that generates a stable water vapour pressure (dew point) within a closed loop. An integrated sample pump maintains a continuous flow through the saturator, probes under test and the external sample connection. At equilibrium, the saturator temperature and system pressure provide a dew point or moisture reference value to which probes or analysers can be compared and calibrated.

FAST AUTOMATED CALIBRATION
From start up, 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.

UNCERTAINTY DEFINED
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.

EMBEDDED PC – EXTERNAL MONITOR – USB HUB
System control is based on an embedded PC with SSD and a touchscreen interface. An external display can be connected using an HDMI cable, and USB peripherals such as keyboard and mouse can be connected through the integrated USB hub. Third-party software additions such as probe calibration software are available on request.

TRANSFER STANDARD
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.

TEMPERATURE MEASUREMENT
The FPG saturator includes two positions for Pt100Ω temperature sensors. One PRT is used for measurement and control with the embedded control system. The second PRT can be connected to an external bridge for independent verification of the saturator temperature. Both PRTs can be removed for calibration if required.

PRESSURE MEASUREMENT
Dew point is pressure dependent, so the measurement of pressure is fundamental to the operation of the FPG, and the precision of the reference dew-frost point reference value. Precise pressure measurement is included within the sampling system and the value is displayed on the front panel together with the dew-frost point.

FLOW MEASUREMENT AND CONTROL
The sample loop includes a mass flow sensor and variable speed sample pump so the user can set the flow rate for the test or calibration. The flow variation can also be used to accelerate stabilisation times.

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Datasheet

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