Method and measuring device for determining the water content of a gas
US5777206A · kind A · utility
Inventors
Key dates
| Filing date | Feb 26, 1997 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Feb 26, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N25/68
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns a method and measuring device for determining the water content of a gas. The measuring device comprises a measuring sensor arrangement which consists of: a capacitive sensor thermally coupled to a heating element and to a temperature sensor; an energy source connected to the heating element; a first evaluation circuit connected to the temperature sensor. The heating element and the temperature sensor are formed by a common temperature-dependent resistor. Together with the temperature dependent resistor and the energy source, the second evaluation circuit forms a control circuit for keeping the temperature of the capacitive sensor constant. As a function of the capacity of the capacitive sensor as the sole variable the first evaluation circuit determines the actual value of the relative humidity of the gas from previously determined calibrating values at the same constant temperature by interpolation or extrapolation of the calibrating values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.