{"title":"Ammonia Gas Sensor - MQ-137","handle":"ammonia-gas-sensor-mq-137","url":"/products/ammonia-gas-sensor-mq-137","description":"The MQ-137 is an ammonia (NH3) gas sensor from Winsen, designed to detect ammonia concentrations in the air. The sensing element is tin dioxide (SnO2), which has lower conductivity in clean air and increases in conductivity as ammonia gas concentration rises.\n\nA simple voltage divider circuit can convert the sensor's change in conductivity into a measurable analog signal, though calibration is required for accurate readings. A gas sensor breakout board is recommended for easy soldering and connection.\n\nKey Features\n\n\nAmmonia Detection – Specifically designed for NH3 gas sensing\n\nSnO2 Sensing Element – Conductivity increases proportionally with ammonia concentration\n\nAnalog Output – Simple circuit converts conductivity change into a measurable signal\n\nManufacturer – Winsen\n\n\nSpecifications\n\n\nTarget Gas – Ammonia (NH3)\n\nSensing Material – Tin dioxide (SnO2)\n\nOutput – Analog (resistance change)\n\n\n\nNote: This sensor requires calibration for accurate concentration readings. A gas sensor breakout board (sold separately) is recommended for easy soldering and breadboard-friendly connections.\n\n\nIdeal For\n\nAmmonia leak detection\nAir quality monitoring\nAgricultural and industrial gas sensing\nEnvironmental monitoring projects\n\n\nPackage Contents\n\n1× MQ-137 Ammonia Gas Sensor\n","vendor":"SparkFun","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":3737,"title":"Default Title","sku":"SF-SEN-17053","price":153.94,"on_sale":false,"in_stock":true,"available_quantity":56,"option1":"Default Title"}]}