{"id":6579,"date":"2026-06-18T15:23:50","date_gmt":"2026-06-18T15:23:50","guid":{"rendered":"https:\/\/materialparts.com\/mq-135\/"},"modified":"2026-06-18T15:23:50","modified_gmt":"2026-06-18T15:23:50","slug":"mq-135","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/mq-135\/","title":{"rendered":"MQ-135"},"content":{"rendered":"

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The MQ-135 is a metal oxide semiconductor gas sensor for air quality monitoring, detecting NH3, NOx, alcohol, benzene, smoke, and CO2. With a detection range of 10-1000ppm, it is widely used in air quality assessment and hazardous gas detection systems.<\/p>\n

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Detectable Gases<\/td>\nNH3, NOx, alcohol, benzene, smoke, CO2<\/td>\n<\/tr>\n
Detection Range<\/td>\n10 to 1000ppm<\/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
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
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-20 to +50 C<\/td>\n<\/tr>\n<\/table>\n

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  • Wide range air quality detection<\/li>\n
  • Detects multiple harmful gases<\/li>\n
  • Dual output: analog and digital<\/li>\n
  • Stable and long service life<\/li>\n
  • Simple drive circuit<\/li>\n<\/ul>\n

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      \n
    • Indoor air quality monitoring<\/li>\n
    • Hazardous gas detection in industry<\/li>\n
    • Air purifier control systems<\/li>\n
    • Environmental monitoring stations<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MQ-135 is a metal oxide semiconductor gas sensor for air quality monitoring, detecting NH3, NOx, alcohol, benzene, smoke, and CO2. With a detection range of 10-1000ppm, it is widely used in air quality assessment and hazardous gas detection systems. Key Specifications Detectable Gases NH3, NOx, alcohol, benzene, smoke, CO2 Detection Range 10 […]<\/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-6579","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","chip_brand-on"],"acf":{"brief_explanation":"MOS air quality sensor, NH3\/NOx\/benzene\/CO2, 10-1000ppm, analog+digital output","date_code":"","package_case":"6-pin through-hole (metal mesh cap, 20mm dia)","in_stock":5578,"datasheet":"https:\/\/www.olimex.com\/Products\/Components\/Sensors\/Gas\/SNS-MQ135\/resources\/SNS-MQ135.pdf","price":"$2.50 @ 1ku","product_introduction":"The MQ-135 is a metal oxide semiconductor gas sensor manufactured by Hanwei Electronics for air quality monitoring. It detects a range of harmful gases including ammonia (NH3), nitrogen oxides (NOx), alcohol, benzene, smoke, and carbon dioxide (CO2) in the 10-1000ppm range. The tin dioxide sensing element changes resistance in response to target gases, with higher concentrations producing lower resistance. Standard breakout modules provide both analog and digital outputs with adjustable threshold. The MQ-135 is commonly used in air purifiers, HVAC systems, and environmental monitoring stations to assess overall air quality.","working_principle":"The MQ-135 uses a tin dioxide (SnO2) semiconductor sensing element. In clean air, oxygen molecules adsorbed on the SnO2 surface trap electrons, creating a depletion layer and increasing sensor resistance. When target gases (NH3, NOx, VOCs, CO2) are present, they react with the adsorbed oxygen, releasing trapped electrons and decreasing resistance. The resistance change follows a logarithmic relationship with gas concentration. The internal heater maintains the sensing element at approximately 300C for optimal reactivity. The sensor cannot distinguish between different gases - it provides a composite air quality reading. For specific gas identification, additional sensors or algorithms are required.","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":"
      • Indoor air quality monitoring for offices and homes with NH3\/VOC detection<\/li>
      • Industrial hazardous gas detection in chemical and manufacturing facilities<\/li>
      • Air purifier control systems with analog concentration feedback<\/li>
      • Environmental monitoring stations with 10-1000ppm sensitivity range<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        MQ-2<\/td>Hanwei<\/td>Flammable gas and smoke focus<\/td><\/tr>
        MQ-7<\/td>Hanwei<\/td>Carbon monoxide specific<\/td><\/tr>
        CCS811<\/td>ScioSense<\/td>Digital eCO2\/VOC, I2C interface<\/td><\/tr>
        SCD41<\/td>Sensirion<\/td>True CO2 photoacoustic, I2C<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6579","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=6579"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6579\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6579"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6579"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6579"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6579"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}