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MEASURING PRINCIPLE
2 - 11
ETC00781(1) Series 100 e 10/2001
2.3.3 Measurement Method
The entire measurement cell is thermostatted to a temperature of up to 75 °C. The four sensors
are electrically heated to a higher temperature and the signal of the Wheatstone Bridge is
monitored. Depending on the thermal conductivity of the gases that pass the cell, the
temperature of the sensors in contact with the gas changes and thus their electrical resistance.
This changes the output signal of the Wheatstone Bridge and electronic circuitry processes this
signal to obtain standardized signal amplitudes, and transmits these to both an indicator
instrument and to the signal output connector.
THERMAL CONDUCTIVITY (TC) MEASUREMENT