The FAS series is a dew-point switch developed with a Polyga® measuring element. It is organized on an aluminium base plate, positioning the measuring element in immediate proximity to the base plate.
The unit is protected by the housing, to allow formation of relative humidity near the dew point. The aluminium plate is adjacent to the cooling pipe, and transports the cold to the measuring element.
Its set point can be configured inside, and has to be adjusted to the local circumstances. The typical switch is arranged with silver contacts. There is a microswitch designed with gold contacts as an option.