MQ-139 Freon R134A sensor module

Specifications

Size：32mm X22mm X27mm   L x W x G
Main chip：LM393.
Operating voltage: DC 5V

 Features

1.With signal output indicator light indication；
2.Dual signal output (Analog output and TTL Level output）；

3.TTL output effective signal is low. When the output is low, the signal light is on. Can be connected to single chip Microcomputer IO Mouth）
4.Analog output increases with concentration. The higher the concentration, the higher the voltage；
5.It has high sensitivity for freon- with a detection range of: 10 ppm -1000 ppm
6.It has long-term service life and reliable stability.；
7.Fast response recovery features；
8.With mounting hole. Easy to fix and install；
9.Probe plug-in design. Convenient Test。