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Explosive Gas Detector Circuit

2017-09-01 21:45  
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A gas sensor (TGS823 from Allegro Electronics, Cornwall Bridge, CT 06754) conducts in the presence of explosive gases. U5 is a voltage-to- frequency converter that produces a frequency proportional to the sensor conductance. The output frequency ranges from 100 IIz in clean air to 8 kHz in a contaminated atmosphere. The dc voltage from the sensor also drives bar graph LED U7 and comparators U4-b and U4-c to sense present caution and danger levels.
Explosive Gas Detector Circuit

Ul drives an ac load up to 100 mA (relay, indicator,.alarm, etc.).



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