Carbon Monoxide Detector 10
Carbon Monoxide Detector 10 : Sensors: (4) Semiconductor: Thin wires of the semiconductor tin dioxide on an insulating ceramic base provide a sensor monitored by an integrated circuit. This sensing element needs to be heated to approximately 400 deg C in order to operate. Oxygen increases resistance of the tin dioxide while carbon monoxide reduces resistance. The integrated circuit monitors the resistance of the sensing element. Lifespans are approximately five to 10 years. The large power demand of this sensor means that it is usually powered from the mains. A battery-powered, pulsed sensor is available with a lifetime in months. This technology has traditionally found high utility in Japan and the far east with some market penetration in USA. However the superior performance of electrochemical cell technology is beginning to displace this technology
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