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MQ137 Ammonia NH3 Gas Sensor

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₹1,600
Ex Tax: ₹1,355.93
  • Stock: In Stock
  • SKU: TECH2017

MQ137 Ammonia NH3 Gas Sensor is use for NH3 gas alarm, industrial NH3 gas leakage alarm, portable NH3 gas detector.

Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air. When NH3 gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.

MQ137 gas sensor has high sensitivity to NH3 gas, also can monitor organic amine such as trimethylamine, cholamine well. It can detect kinds of gases including ammonia and is a kind of low-cost sensor for kinds of applications.

Features

  • You can use it as both digital sensors and analog sensors.
  • This sensor operates in an analog voltage range of 0V to 5V. In the case of digital voltages, the output voltage is either 0 or 5V.
  • It has high sensitivity to ammonia and organic amines.
  • It provides a stable operation along with fast response.
  • You can change the digital pin sensitivity by connecting a potentiometer and varying its resistance.
  • It provides a feature of preheating duration over 24 hours.

Specifications:

Model

MQ137

Sensor Type

Semiconductor

Standard Encapsulation

Bakelite, Metal cap

Target Gas

Ammonia Gas(NH3)

Detection range

5500ppm NH3

Standard Circuit Conditions

Loop Voltage

Vc

≤24V DC

Heater Voltage

VH

5.0V±0.1V AC or DC

Load Resistance

RL

Adjustable

Sensor character under standard test conditions

Heater Resistance

RH

29Ω±3Ω(room tem.)

Heater consumption

PH

≤900mW

Sensitivity

S

Rs(in air)/Rs(50ppmNH3)≥2

Output Voltage

Vs

≥0.5V (in 50ppm NH3)

Concentration Slope

α

≤0.6(R200ppm/R50ppm NH3)

Standard test conditions

Tem. Humidity

20±255%±5%RH

Standard test circuit

Vc:5.0V±0.1V VH: 5.0V±0.1V

Preheat time

Over 48 hours


Applica

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