Patent ID: 6230543
Filing Date: 2001-05-15
Classification: G01N

Abstract:
A method for calibrating a humidity detector which includes a sensor having an electrical characteristic that varies as a function of humidity to which the sensor is exposed and which includes a transmitter circuit to which the sensor is connected, wherein the transmitter circuit produces an output signal in response to the electrical characteristic of the sensor, said method comprising steps of:connecting a first reference device to the transmitter circuit in place of the sensor, wherein the first reference device has a first value of the electrical characteristic which corresponds to performance of the sensor at a first predefined humidity level;adjusting the transmitter circuit so that the output signal is indicative of the first predefined humidity level;disconnecting the first reference device from the transmitter circuit;connecting a second reference device to the transmitter circuit in place of the sensor, wherein the second reference device has a second value of the electrical characteristic which corresponds to performance of the sensor at a second predefined humidity level;adjusting the transmitter circuit so that the output signal is indicative of the second predefined humidity level;disconnecting the second reference device from the transmitter circuit;connecting the sensor to the transmitter circuit;exposing the sensor to a known level of humidity;adjusting the transmitter circuit so that the output signal is indicative of the known level of humidity.