Gas analyzer circuitry

摘要: Apparatus for detecting and indicating the presence of substances such as smoke combustible gasses. One or more detectors generate output signals which are applied to a comparator amplifier. The magnitude detector varies unidirectionally function concentration detected. amplifier difference in signals. Failure detection circuitry is included detects failure actuate apply their comparator. test provided independent elements may be preselected during testing not any safety circuits latching relays apparatus control. In preferred embodiment, utilized automatically compensate sensor drift long term changes, so that only large rapid changes