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AssigneeSiemens Building Technologies, Inc.
InventorsChristoph Haas, Yves Lüthi
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In a method of determining air humidity, a capacitive moisture measuring element (2) used in a moisture sensor for calculation operations is modelled by a parallel circuit of an ideal capacitor (C) and an ohmic resistance (Rp). Charging and/or discharging of the capacitive moisture measuring element (2) by way of a first measuring resistor (R1; RA) provides for ascertaining a first time constant or a first period duration of the charging and/or discharging operation, and charging and/or discharging of the moisture measuring element (2) by way of a second measuring resistor (R2; RA//R) provides for ascertaining a second one. The capacitance (C) of the moisture measuring element (2) is then calculated from the two time constants or the two period durations, a value for the moisture level finally being ascertained from the capacitance. This method achieves a higher level of measuring accuracy on the part of the moisture sensor.
A method of determining air humidity with a capacitive moisture measuring element, comprising the method steps of:
A moisture sensor comprising a capacitive moisture measuring element and a first circuit connected to the moisture measuring element, the first circuit comprising a first measuring resistor, a second measuring resistor and a processing circuit,
A method of determining air humidity, comprising:
Dependencies are inferred from the claim text.