{"product_id":"mq137-ammonia-gas-sensor-module","title":"MQ137 Ammonia Gas Sensor Module","description":"\u003ch2\u003eMQ137 Ammonia Gas Sensor Module — NH3 Detection\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eMQ137\u003c\/strong\u003e is a semiconductor gas sensor designed to detect ammonia (NH3) — a colorless, pungent gas commonly found in fertilizers, refrigeration systems, and industrial processes. It uses a SnO2 sensing element whose resistance changes in the presence of NH3. With analog and digital outputs, it is ideal for air quality monitoring, agricultural environments, and industrial safety systems using Arduino or ESP32.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeater Voltage\u003c\/td\u003e\n\u003ctd\u003e5V ±0.1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAnalog (AO) + Digital (DO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget Gas\u003c\/td\u003e\n\u003ctd\u003eAmmonia (NH3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDetection Range\u003c\/td\u003e\n\u003ctd\u003e5 ppm – 500 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePreheat Time\u003c\/td\u003e\n\u003ctd\u003e~20 seconds (minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-20°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Humidity\u003c\/td\u003e\n\u003ctd\u003eLess than 95% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003ePinout\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePin\u003c\/th\u003e\n\u003cth\u003eName\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVCC\u003c\/td\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e5V Supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGND\u003c\/td\u003e\n\u003ctd\u003eGround\u003c\/td\u003e\n\u003ctd\u003eGround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDO\u003c\/td\u003e\n\u003ctd\u003eDigital Output\u003c\/td\u003e\n\u003ctd\u003eHIGH when gas exceeds threshold (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAO\u003c\/td\u003e\n\u003ctd\u003eAnalog Output\u003c\/td\u003e\n\u003ctd\u003eVoltage proportional to NH3 concentration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSelective detection of ammonia (NH3) gas\u003c\/li\u003e\n\u003cli\u003eDual output: analog for concentration measurement, digital for threshold alarm\u003c\/li\u003e\n\u003cli\u003eAdjustable sensitivity via onboard potentiometer\u003c\/li\u003e\n\u003cli\u003eFast response and recovery time\u003c\/li\u003e\n\u003cli\u003eCompatible with Arduino, ESP32, STM32, PIC\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAgricultural and poultry farm air quality monitoring\u003c\/li\u003e\n\u003cli\u003eIndustrial ammonia leak detection and alarms\u003c\/li\u003e\n\u003cli\u003eRefrigeration system safety monitoring\u003c\/li\u003e\n\u003cli\u003eFertilizer plant safety systems\u003c\/li\u003e\n\u003cli\u003eIndoor air quality and ventilation control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eShop Related Sensors at Embeded Studio\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mq136-hydrogen-sulfide-gas-sensor-module\"\u003eMQ136 Hydrogen Sulfide Gas Sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mq131-ozone-gas-sensor-module\"\u003eMQ131 Ozone Gas Sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mics6814-multi-gas-sensor-module\"\u003eMICS6814 Multi-Gas Sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\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-gas-sensor-module","provider":"Embeded Studio","version":"1.0","type":"link"}