MQ-137 Ammonia Gas Sensor Module NH3 Concentration Level Detection with Analog and DIgital Output for Microcontroller Arduino ESP32 ESP8266 STM32 Raspberry Pi Air Quality Agricultural Hazardous Industrial Chemical Leak Environment Safety Monitoring System - A. SINGLE TURN

MQ-137 DC 5V Ammonia Detection NH3 Gas Sensor Module Analog + TTL Level Output MQ137 + Cable
Feature:
1. With signal output indicator light;
2. Dual signal output (analog output and TTL level output);
3. TTL output effective signal is low level; (the signal light is on when the output is low level, and can be connected to the MCU IO port)
4. The analog output increases as the concentration increases, the higher the concentration, the higher the voltage;
5. It has high sensitivity and selectivity to ammonia;
6. It has a long service life and reliable stability;
7. Fast response and recovery characteristics;
8. With mounting holes, convenient for fixed installation;
9. The probe can be plugged and unplugged to facilitate testing.

Specification:
Main chip: LM393, NH3 gas sensor probe
Working voltage: DC 5V
Module size:
A.20x32x22mm
B.24x36x32mm
C.35x40x28mm
Application: for harmful gas detection device used in home and environment, suitable for ammonia vapor detection