FORFARANDE OCH ANORDNING FOR METNING AV NEDSMUTSNINGEN AV EN KAPACITIV DAGGPUNKTSGIVARE

摘要

A dew-point measuring instrument has a capacitive dew-point sensor 1 which is cooled by a cooling device 17 to the dew-point temperature measured by a temperature sensor 8. A phase measuring circuit 14 measures the phase angle of the impedance of the capacitive dew-point sensor 1. The measured phase angle is used as a gauge for the contamination of the dew-point sensor 1.