Patent ID: 7481107

Claim:
A humidity sensor comprising: a substrate; a pair of electrodes arranged on the substrate in such a manner that the electrodes are separated each other by a predetermined distance therebetween; a humidity sensitive member disposed between the electrodes, wherein the humidity sensitive member has a capacitance, which is changeable in accordance with humidity; an output element connecting to the electrodes in order to detect a capacitance of the humidity sensitive member and outputting a signal corresponding to the capacitance; and a setting member for setting a maximum amount of moisture in the humidity sensitive member to be a standard maximum amount of moisture, wherein the humidity sensitive member is capable of absorbing a moisture up to the maximum amount of moisture, the setting member includes at least one of an element for reducing the maximum amount of moisture and an element for increasing the maximum amount of moisture, the sensor is mounted in an automotive vehicle, and the setting member sets the maximum amount of moisture to be the standard maximum amount of moisture when a start switch of the vehicle turns on.