Patent ID: 6622543
Filing Date: 2003-09-23
Classification: G01N

Abstract:
A flammable gas detection sensor wherein heating of the sensor by contact catalytic reaction of a flowing flammable detection gas gives off a detection signal of the flammable gas, said flammable gas detection sensor comprising:a first detection sensor including a diaphragm having a platinum coat on a side thereof with which the flowing flammable detection gas comes in contact and a thermocouple having respective ends of two different kinds of metals placed close to each other and fixed on a reverse side of the diaphragm not coming in contact with the flowing flammable detection gas and which is heated by contact catalytic reaction of the flowing flammable detection gas, and a second detection sensor including a diaphragm having a surface coming in contact with the flowing flammable detection gas and a thermocouple having respective ends of two different kinds of metals placed close to each other and fixed on a reverse side of the diaphragm not coming in contact with the flowing flammable detection gas and which detects the temperature of the flowing flammable detection gas.