1 pcs lot Formaldehyde Gas Detection Sensor MQ138 Aldehyde Ketone Alcohol Gas Sensor Module

Features Size: 32mm X22mm X30mm long * wide * high Main chip: LM393, formaldehyde sensor probe Operating voltage: DC 5V 1, with a signal output indicator light; 2, dual signal output (analog output and TTL level output); 3, TTL output valid signal is low; (output low when the signal light, can be connected to the microcontroller IO port) 4, the analog output increases with the increase of concentration, the higher the higher the higher the voltage; 5, the aldehydes, alcohols, ketones, aromatic compounds have a high sensitivity; 6, with long service life and reliable stability; 7, fast response to recovery characteristics; 8, with a mounting hole, easy to install; 9, the probe can be plug design, easy to test. application: For the home, the environment of the volatiles detection device, suitable for aldehydes, alcohols, ketones, aromatic compounds detection, gas-sensitive components test concentration range: Benzene 1 to 100 ppm Toluene 10 to 100 ppm Methanol 5 to 100 ppm Alcohol 30 to 300ppm Acetone 10 to 300 ppm Formaldehyde 1 to 10 ppm