Set point control circuit for an infrared gas analyzer

Details Set point control circuit for an infrared gas analyzer Set point control circuit for an infrared gas analyzer

1988-04-15

1990-04-17

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2502521, 250352, G01N 2161

Patent

active

049183117

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.

REFERENCES:
patent: 4233513 (1980-11-01), Elder et al.
patent: 4398091 (1983-08-01), Passaro
patent: 4687934 (1987-08-01), Passaro et al.

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