MQ137 gas sensor module MQ-137 ammonia module NH3

Ammonia gas detection module: output analog voltage signal and TTL level signal. It is suitable for low-end products and environments with low requirements for measurement accuracy and error.

 

Product features of ammonia gas detection module

1. Dimensions: length * width * height 34mm X24mm X30mm  

2. Main chip: LM393, MQ-137 ammonia sensor

3. Working voltage: DC 5V

4. Features:

 1. With signal output indicator light;

 2. Dual signal output (analog (0.2-3V) 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 IO port of the single-chip microcomputer)               

 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 (4×3#), convenient for fixed installation;

5. Application:

 

    Harmful gas detection device used in home and environment, suitable for the detection of ammonia vapor, the test concentration range of ammonia gas sensor: 5 to 500ppm

 

MQ136 Sensor:

Sensitive material of MQ136 gas sensor is SnO2, which with lower conductivity in clean air. When the target H2S gas exist, the sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.

 

MQ136 gas sensor has high sensitity to H2S, also could be used to detect other vapor which contains Sulfur. It has low sensitivity to normal combustible gases, which is with low cost and suitable for different application.