Measuring presence and/or concentration of analyte using gas sensor, by comparing first recorded value with threshold and triggering alarm if threshold is exceeded

摘要

A radiation source emits radiation in the form of pulses. During a pulse, a number of individual values are recorded in order to produce an average value. During the first radiation pulse the first individual value is compared with a predetermined threshold, and if the threshold is exceeded, an alarm signal is generates. An independent claim is included for a gas sensor apparatus.