{"product_id":"mq137-ammonia-nh3-gas-sensor-module","title":"MQ-137 Ammonia (NH3) Gas Sensor Module","description":"\u003cp\u003e\u003cstrong\u003eMQ-137 Ammonia (NH3) Gas Sensor Module\u003c\/strong\u003e is a 5V semiconductor sensing board for ammonia-detection experiments, environmental monitoring prototypes, poultry and livestock facilities, refrigeration projects and industrial gas-leak monitoring systems. It provides both an analog signal and an adjustable digital threshold output for Arduino, ESP32, Raspberry Pi Pico and other microcontrollers.\u003c\/p\u003e\n\u003cp\u003eThe MQ-137 sensing element is primarily sensitive to ammonia and also responds to certain organic amines. Reliable concentration estimates require extended preheating, a clean-air baseline and calibration using known gas concentrations.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMQ-137 tin-dioxide semiconductor ammonia sensor\u003c\/li\u003e\n\u003cli\u003eTarget gas: ammonia (NH3)\u003c\/li\u003e\n\u003cli\u003eManufacturer-specified detection range: 5–500 ppm NH3\u003c\/li\u003e\n\u003cli\u003eAnalog output for monitoring relative gas concentration\u003c\/li\u003e\n\u003cli\u003eDigital comparator output with adjustable threshold\u003c\/li\u003e\n\u003cli\u003eOn-board potentiometer and status LEDs\u003c\/li\u003e\n\u003cli\u003eSuitable for embedded environmental-monitoring projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSensor model\u003c\/th\u003e\n\u003ctd\u003eMQ-137\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDetection principle\u003c\/th\u003e\n\u003ctd\u003eSemiconductor (SnO₂)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget gas\u003c\/th\u003e\n\u003ctd\u003eAmmonia (NH3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDetection range\u003c\/th\u003e\n\u003ctd\u003e5–500 ppm NH3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule supply\u003c\/th\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutputs\u003c\/th\u003e\n\u003ctd\u003eAnalog AO and digital DO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDigital threshold\u003c\/th\u003e\n\u003ctd\u003eAdjustable through the on-board potentiometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSensor heater voltage\u003c\/th\u003e\n\u003ctd\u003e5.0V ±0.1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSensor heater consumption\u003c\/th\u003e\n\u003ctd\u003eUp to approximately 950mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarm-up\u003c\/th\u003e\n\u003ctd\u003eExtended preheating and calibration recommended before quantitative use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule connections\u003c\/th\u003e\n\u003ctd\u003eVCC, GND, AO and DO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePoultry, livestock and agricultural air-quality projects\u003c\/li\u003e\n\u003cli\u003eRefrigeration and fertilizer-area ammonia monitoring\u003c\/li\u003e\n\u003cli\u003eVentilation-control and environmental-monitoring prototypes\u003c\/li\u003e\n\u003cli\u003eArduino, ESP32, STM32 and Raspberry Pi Pico projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Includes\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e1 × MQ-137 ammonia gas sensor module\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003eRelated Gas Sensors\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mics-5524-multi-gas-sensor-module\"\u003eMiCS-5524 Multi-Gas Sensor Module\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mq136-hydrogen-sulfide-gas-sensor-module\"\u003eMQ-136 Hydrogen Sulfide Gas Sensor Module\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mq135-gas-sensor\"\u003eMQ-135 Air Quality Gas Sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mq7-gas-sensor\"\u003eMQ-7 Carbon Monoxide Gas Sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mq3-alcohol-gas-sensor\"\u003eMQ-3 Alcohol Gas Sensor Module\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does the MQ-137 detect?\u003c\/h3\u003e\n\u003cp\u003eIt is designed primarily for ammonia (NH3) and also responds to some organic amines. Other gases, temperature and humidity can influence its response.\u003c\/p\u003e\n\u003ch3\u003eWhat is its detection range?\u003c\/h3\u003e\n\u003cp\u003eThe sensor manufacturer specifies 5–500 ppm NH3 under appropriate test and calibration conditions.\u003c\/p\u003e\n\u003ch3\u003eWhat is the difference between AO and DO?\u003c\/h3\u003e\n\u003cp\u003eAO provides a varying analog voltage related to the sensor response. DO switches when the response crosses the threshold selected with the on-board potentiometer.\u003c\/p\u003e\n\u003ch3\u003eDoes the MQ-137 require calibration?\u003c\/h3\u003e\n\u003cp\u003eYes. Allow extended preheating, establish a clean-air baseline and calibrate with known ammonia concentrations when quantitative readings are needed.\u003c\/p\u003e\n\u003ch3\u003eCan it connect to Arduino, ESP32 or Raspberry Pi Pico?\u003c\/h3\u003e\n\u003cp\u003eYes, with a suitable 5V supply and signal-level precautions. Protect 3.3V analog inputs if the module output can exceed the controller’s ADC limit.\u003c\/p\u003e\n\u003ch3\u003eCan this module replace a certified ammonia alarm?\u003c\/h3\u003e\n\u003cp\u003eNo. It is intended for development, education and prototyping, not as a certified life-safety or industrial protection device.\u003c\/p\u003e\n\u003ch3\u003eIs delivery available across Pakistan?\u003c\/h3\u003e\n\u003cp\u003eYes. Embeded Studio offers delivery to major cities and other serviceable locations throughout Pakistan.\u003c\/p\u003e","brand":"Embeded Studio","offers":[{"title":"Default Title","offer_id":62001587356018,"sku":"MQ137-MOD","price":2500.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/7935\/3202\/files\/Mq137.webp?v=1783098417","url":"https:\/\/embededstudio.com\/products\/mq137-ammonia-nh3-gas-sensor-module","provider":"Embeded Studio","version":"1.0","type":"link"}