{"id":6578,"date":"2026-06-18T15:23:48","date_gmt":"2026-06-18T15:23:48","guid":{"rendered":"https:\/\/materialparts.com\/mq-2\/"},"modified":"2026-06-18T15:23:48","modified_gmt":"2026-06-18T15:23:48","slug":"mq-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/mq-2\/","title":{"rendered":"MQ-2"},"content":{"rendered":"

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The MQ-2 is a metal oxide semiconductor (MOS) gas sensor that detects LPG, propane, methane, alcohol, hydrogen, and smoke. With a detection range of 300-10000ppm and both analog and digital outputs, it is widely used in gas leakage detection and fire alarm systems.<\/p>\n

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Detectable Gases<\/td>\nLPG, propane, methane, alcohol, hydrogen, smoke<\/td>\n<\/tr>\n
Detection Range<\/td>\n300 to 10000ppm<\/td>\n<\/tr>\n
Sensitivity<\/td>\nRs\/Ro adjusted by gas concentration<\/td>\n<\/tr>\n
Heater Voltage<\/td>\n5V (+\/-0.2V)<\/td>\n<\/tr>\n
Load Resistance<\/td>\nAdjustable (on module)<\/td>\n<\/tr>\n
Preheat Time<\/td>\n20+ seconds (recommended)<\/td>\n<\/tr>\n
\u0627\u0644\u0645\u062e\u0631\u062c\u0627\u062a<\/td>\nAnalog (0-5V) + Digital (threshold comparator)<\/td>\n<\/tr>\n
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  • Wide detection range: 300-10000ppm<\/li>\n
  • Detects multiple flammable gases and smoke<\/li>\n
  • Dual output: analog and digital (with potentiometer threshold)<\/li>\n
  • Fast response and recovery<\/li>\n
  • Stable and long service life<\/li>\n<\/ul>\n

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      \n
    • Gas leakage detection in homes and industry<\/li>\n
    • Fire and smoke alarm systems<\/li>\n
    • Portable gas detectors<\/li>\n
    • Air quality monitoring<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MQ-2 is a metal oxide semiconductor (MOS) gas sensor that detects LPG, propane, methane, alcohol, hydrogen, and smoke. With a detection range of 300-10000ppm and both analog and digital outputs, it is widely used in gas leakage detection and fire alarm systems. Key Specifications Detectable Gases LPG, propane, methane, alcohol, hydrogen, smoke […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,42],"tags":[],"chip_brand":[144],"class_list":["post-6578","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","chip_brand-on"],"acf":{"brief_explanation":"MOS gas sensor, LPG\/propane\/methane\/smoke, 300-10000ppm, analog+digital output","date_code":"","package_case":"6-pin through-hole (metal mesh cap, 20mm dia)","in_stock":3962,"datasheet":"https:\/\/www.pololu.com\/file\/0J313\/MQ2.pdf","price":"$2.00 @ 1ku","product_introduction":"The MQ-2 is a metal oxide semiconductor (MOS) type gas sensor manufactured by Hanwei Electronics. It detects a broad range of flammable gases including LPG, propane, methane, alcohol, hydrogen, and smoke in the 300-10000ppm concentration range. The sensor uses a tin dioxide (SnO2) sensing layer whose resistance decreases in the presence of combustible gases. A built-in heater (5V) maintains the sensing element at the optimal operating temperature. Standard MQ-2 breakout modules provide both an analog output proportional to gas concentration and a digital output with an adjustable threshold via onboard potentiometer. The sensor requires a preheat period of at least 20 seconds for stable readings.","working_principle":"The MQ-2 uses a tin dioxide (SnO2) semiconductor as the sensing element. In clean air, oxygen adsorbs onto the SnO2 surface, creating a depletion layer that increases the sensor resistance. When combustible gases are present, they react with the adsorbed oxygen, releasing electrons back into the conduction band and decreasing the sensor resistance. The resistance change is proportional to gas concentration (logarithmic relationship). The internal heater (5V, approximately 800mW) maintains the sensing layer at approximately 300C for optimal sensitivity and response time. The sensor output is the voltage across a load resistor in series with the sensing element.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>H-1<\/td>Heater terminal 1<\/td><\/tr>
      2<\/td>A-1<\/td>Sensing electrode A (terminal 1)<\/td><\/tr>
      3<\/td>H-2<\/td>Heater terminal 2<\/td><\/tr>
      4<\/td>A-2<\/td>Sensing electrode A (terminal 2)<\/td><\/tr>
      5<\/td>B-1<\/td>Sensing electrode B (terminal 1)<\/td><\/tr>
      6<\/td>B-2<\/td>Sensing electrode B (terminal 2)<\/td><\/tr><\/table>","application_scenarios":"
      • Home gas leakage detection for LPG and propane with alarm threshold<\/li>
      • Industrial fire and smoke alarm systems with 300-10000ppm range<\/li>
      • Portable gas detectors for emergency responders and safety personnel<\/li>
      • Arduino-based air quality monitoring with analog concentration output<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        MQ-5<\/td>Hanwei<\/td>Higher sensitivity to LPG\/natural gas<\/td><\/tr>
        MQ-135<\/td>Hanwei<\/td>Air quality, NH3, CO2, benzene detection<\/td><\/tr>
        MQ-9<\/td>Hanwei<\/td>CO and combustible gas detection<\/td><\/tr>
        SCD41<\/td>Sensirion<\/td>True CO2 measurement, digital I2C<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6578","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=6578"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6578\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6578"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6578"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6578"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6578"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}