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MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module

MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module

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  • The gas sensor module has a signal output indicator indication.
  • The analog output increases with increasing concentration, and the higher the concentration, the higher the voltage.
  • The MQ137 gas sensor is sensitive to ammonia and carbin monoxide.
  • Buy the MQ137 Gas sensor module online at best prices.

MQ-137 NH3 Gas Sensor Module

The MQ137 sensor is a gas sensor module specially designed to detect and sense gases like ammonia (NH3) and carbon monoxide (CO). The MQ-137 gas sensor module is a device that can detect the presence of ammonia (NH3) gas in the air. It is commonly used in applications such as air quality monitors, industrial control systems, and agricultural environments. The MQ-137 sensor operates by using a chemical reaction between the ammonia gas and conductive metal oxide to produce a current.

The magnitude of the current is proportional to the concentration of ammonia gas in the air. The sensor can be used to detect ammonia gas concentrations in the range of 0-1000 ppm. Ammonia is a toxic gas that can be harmful to humans at high concentrations. It is recommended to use the MQ-137 sensor with caution and to take appropriate safety measures when working with it.


    • Detect or measure Gases like NH3 or CO
    • Air quality monitor
    • Gas leak alarm
    • Safety standard maintenance
    • Maintaining environmental standards  in hospitals 

    Package Includes:

    • 1 x MQ-137 NH3 Gas Sensor Module


    Main chip LM393
    Gas Sensitivity  Ammonia (NH3) and Carbon Monodioxide (CO)
    Working voltage DC 5V
    concentration range 10 to 300ppm
    Dimensions  32mm X22mm X30mm
    Weight  10 grams

    Shipping & Returns

    • All orders confirmed before 3 pm IST are shipped on the
      same day, barring rare pickup delays on holidays or disturbances
    • Delivery time in Metro cities is 1-3 days, Others it is
      3-7 days. It varies based on location, reliant on courier services
    • Return window: 7 days from receipt unless stated
      otherwise. No refunds/replacements after
    • Returns only for non-working/damaged products are accepted
    • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
    • Refunds are processed within 3-4 working days post inspection and approval.

    For more details, please check our Shipping and Return Policy

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    1. What are gas sensors? How do they work?

    • Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration. 
      Gas sensor detects the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.

    2. How to detect gases with the MQ137 gas sensor module?

    • Power the gas sensor module with 5V and you should notice the power LED on the module glow.
      When no gas is detected the output LED will remain turned off meaning the digital output pin will be 0V. 
      These sensors need pre-heating time before they can actually be used.
      Introduce the sensor to the gas you want to detect and you should see the output LED go high along with the digital pin, if not use the potentiometer until the output gets high.