FIELD: chemistry.
SUBSTANCE: thermocatalytic methane alarm differs from existing alarms in that one of the two digital-to-analogue converters (DAC) in the microprocessor module, specifically DAC-1, performs the function of setting the supply pulse with multistep form with given amplitude and duration of each of the steps, and DAC-2 generates the bias potential in synchronisation with signals from measurement steps of the supply pulse. The output of DAC-1 is connected through a preamplifier to the sensor input, and the output of DAC-2 is connected to the inverting input of the amplifier-measurement unit.
EFFECT: reduced power consumption while preserving metrological characteristics which comply with home methane alarm regulations.
2 cl, 3 dwg, 1 tbl
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