Rotronic HygroGen

The HygroGen is a generator of controlled percentage relative humidity (%rh) and temperature conditions, primarily for calibrating humidity instrumentation.

It is completely self-contained, requiring no external resources except mains power, and is light enough to be portable for use on-site. Its key features are its ability to control the temperature within the calibration chamber over the wide range of 5…50°C, and to change the humidity condition in the chamber in typically just two minutes. It is possible to calibrate up to five probes simultaneously. A comprehensive range of probe sizes may be supported, so almost any type of hygrometer can be calibrated in the HygroGen.

Significant cost savings can be achieved using the HygroGen. With each calibration point typically achieved in ten minutes or less, laboratory or on-site calibrations can be carried out in a fraction of the time taken when using salt methods. Being portable, the HygroGen can be applied to instruments on-site, which again saves the time normally taken to un-install and re-install fixed transmitters. A further benefit of this method of calibration is that the whole instrument loop or monitoring system can be verfied.

An uncertainty framework is available to users of the HygroGen. The typical uncertainty of the humidity and temperature is ±1.5…2.0 %rh and ±0.2°C, based on the use of a certified %rh probe. This probe is easily removed and replaced, so the HygroGen can be kept in constant use, even when the transfer standard calibration is due.

The instrument is delivered as standard with a certified control probe, and requires no specialist training to operate or maintain, allowing the user to start calibrating humidity probes immediately.