IR gas analyser for multi-atomic, non-elementary gas - suppresses receiver drift caused by heating radiation source using continuous correction in multiplier

摘要

The analyser contains an infrared source (1) with an arrangement for producing an alternating beam, an absorption cuvette (6) for the gas to be analysed, an interference filter, a radiation receiver (7) and an evaluation circuit. The receiver signal, corresp. to the gas concn. in the cuvette, is multiplied (13) by a signal from an amplifier (12) dependent on the source power and ambient temp. The product is added (15) to a reference signal and the result displayed (18). USE/ADVANTAGE - Continuous measurement. Receiver signal drift caused by heating up of radiation source is suppressed by continuous correction.