Description: For the family, the environment of the volatile compounds detection devices, suitable aldehydes, alcohols, ketones, aromatic compounds detected, the gas sensor test concentration range: 1 to 100ppm benzene Toluene 10 to 100ppm Methanol 5 to 100ppm Alcohol 30 to 300ppm Acetone 10 to 300ppm Formaldehyde 1 to 10ppm Provide a reference routines, circuit diagrams and Other relative information. Specification: Size: 32mm x 22mm x 30mm Main chip: LM393, formaldehyde-sensing probe Working voltage: DC 5V Characteristics: with the signal output LED indication; 2-way signal output (analog output, and TTL-level output); TTL output valid signal is low; (low output signal light, which can be accessed microcontroller IO port) analog output increases with the concentration, the higher the voltage the higher the concentration; aldehydes, alcohols, ketones, aromatic compounds with high sensitivity; with a long life and reliable stability; Fast response characteristics; with mounting holes for easy permanent installation; the probe can plug design for easy testing. Package Include: 1x MQ138 Formaldehyde Aldehydes gas detection sensor
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