Humidity Generator

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OHG Humidity Generator: The Owlstone Humidity Generator (OHG-4) is a versatile humidity generator that is used to produce a range of relative humidity concentrations from 1 to 90%rh (±1%) .

Designed to be mounted in the GEN-SYS rack the OHG-4 can be used in conjunction with the OVG-4 to generate a wide range of vapor standards, suitable for calibration of sensors, especially gas sensors.

In the OHG, the airflow is controlled by a mass flow controller. A flow suitable for the application is set using the front panel Wet Air Flow control, this controls the mass flow controller (MFC). Downstream of the MFC the airflow is split into two flow paths, the first of which bubbles through the water reservoir. Downstream of the reservoir the two flows are recombined. The ratio of the two needle valve settings controls the humidity of the output air.