Set point control circuit for an infrared gas analyzer
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United States of America Patent
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-
Apr 17, 1990
Grant Date -
N/A
app pub date -
Apr 15, 1988
filing date -
Apr 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An arrangement for ensuring the stability of the set point for a gas analyzer is disclosed. The set point control circuit utilizes an amplifier which is alternately switched between a reference voltage and a sensor signal to provide a signal to a processor representing the reference signal and the sensor signal. The processor compares the two signals and adjusts the heater associated with the sensor to provide a stable set point for the gas analyzer. The arrangement eliminates the need for precision resistors within the set point control circuit and therefore significantly reduces the cost of the circuitry.
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