초록 ▼

A humidity sensitive device for sensing the humidity of an ambient humidity comprising a humidity sensitive resistor 15 which comprises as main component at least one selected from the group consisting of ZrO2, TiO2, Nb2O5 and Ta2O5 and an electric heater 13 applied near and for heating and retainin

A humidity sensitive device for sensing the humidity of an ambient humidity comprising a humidity sensitive resistor 15 which comprises as main component at least one selected from the group consisting of ZrO2, TiO2, Nb2O5 and Ta2O5 and an electric heater 13 applied near and for heating and retaining the humidity sensitive resistor 15 at a temperature above 200°C. The humidity sensitive resistor 15 and a fixed resistor are series connected across an AC voltage source 17, and a voltage across the humidity sensitive resistor 15 or the fixed resistor 16 is rectified by a AC/DC converter and compared with a reference voltage by a comparator, thereby an output responding to humidity in the atmosphere can be measured for a wide range of temperature.

대표청구항 ▼

A humidity sensitive device for sensing the humidity of an ambient atmosphere comprising: humidity sensitive resistor means for exhibiting an electrical resistance which is dependent upon chemisorption of water vapor at a temperature substantially above 200°C. where substantially no physisorption is

A humidity sensitive device for sensing the humidity of an ambient atmosphere comprising: humidity sensitive resistor means for exhibiting an electrical resistance which is dependent upon chemisorption of water vapor at a temperature substantially above 200°C. where substantially no physisorption is possible to thereby responsively sense the humidity of an ambient atmosphere during a humidity sensing operation conducted at said temperature; said humidity sensitive resistor means consisting essentially of at least one main component selected from the group consisting of ZrO2, Nb2O5, and Ta2O5; and electric heater means for maintaining said humidity sensitive resistor means at said temperature above 200°C. during said humidity sensing operation.