{"product_id":"mq-135-gas-sensor","title":"MQ-135 GAS SENSOR","description":"\u003cmeta name=\"description\" content=\"Buy MQ135 GAS SENSOR online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n```html\n\u003ch1\u003eMQ-135 Gas Sensor - Air Quality Detection for NH3, NOx, CO2, Benzene \u0026amp; Smoke\u003c\/h1\u003e\n\u003cp\u003eMonitor air quality with precision using the MQ-135 Gas Sensor from The Engineer Store, Bengaluru. This versatile semiconductor gas sensor detects ammonia (NH3), nitrogen oxides (NOx), carbon dioxide (CO2), benzene, alcohol, and smoke - making it ideal for air quality monitoring systems, pollution detection projects, and smart home automation. Fast shipping across India with full technical support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Model\u003c\/td\u003e\n\u003ctd\u003eMQ-135\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Type\u003c\/td\u003e\n\u003ctd\u003eSemiconductor (SnO2) Gas Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDetectable Gases\u003c\/td\u003e\n\u003ctd\u003eNH3, NOx, CO2, Alcohol, Benzene, Smoke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating 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 AC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeater Power Consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;= 950 mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad Resistance\u003c\/td\u003e\n\u003ctd\u003eAdjustable (recommended 10 KOhm - 47 KOhm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensing Resistance Range\u003c\/td\u003e\n\u003ctd\u003e2 KOhm - 20 KOhm (in 100 ppm NH3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDetection Concentration Range\u003c\/td\u003e\n\u003ctd\u003e10 ppm - 1000 ppm (varies by gas)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAnalog (voltage proportional to gas concentration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePreheat Time\u003c\/td\u003e\n\u003ctd\u003e24-48 hours (initial); ~2-5 minutes (subsequent use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-20 degreesC to +50 degreesC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Humidity\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;= 95% RH (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin Configuration\u003c\/td\u003e\n\u003ctd\u003e6 pins - H (Heater) x 2, A (Signal) x 2, B (Signal) x 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Dimensions\u003c\/td\u003e\n\u003ctd\u003e~18 mm (diameter) x 21 mm (height) (standard TO-5 package)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eArduino, ESP32, ESP8266, Raspberry Pi (via ADC), STM32, PIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal \/ Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7-day warranty on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003eEmail \u0026amp; WhatsApp 24\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhy Choose the MQ-135 Gas Sensor?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Gas Detection:\u003c\/strong\u003e Senses a broad spectrum of harmful gases including ammonia, carbon dioxide, benzene, alcohol, nitrogen oxides, and smoke in a single compact sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple Analog Output:\u003c\/strong\u003e Provides a straightforward analog voltage output that increases with gas concentration - easily read by any microcontroller's ADC pin without complex communication protocols.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Sensitivity \u0026amp; Fast Response:\u003c\/strong\u003e The tin dioxide (SnO2) sensing element offers rapid response and recovery times, enabling real-time air quality monitoring with reliable detection accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Detection Range:\u003c\/strong\u003e Capable of detecting gas concentrations from 10 ppm to 1000 ppm, suitable for both indoor air quality monitoring and industrial hazard detection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Cost, High Value:\u003c\/strong\u003e One of the most affordable and widely documented gas sensors available - backed by extensive community libraries, tutorials, and reference designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Microcontroller Compatibility:\u003c\/strong\u003e Works seamlessly with Arduino Uno\/Nano\/Mega, ESP32, ESP8266, Raspberry Pi (with external ADC like ADS1115), STM32, and virtually any 5V-compatible development board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Authentic:\u003c\/strong\u003e Sourced directly from authorized distributors with verified authenticity - no clones or substandard components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Shipping from Bengaluru:\u003c\/strong\u003e 1-5 day shipping, 7-8 day delivery across India; same-day dispatch available in Bengaluru.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpert Technical Support:\u003c\/strong\u003e Full guidance on wiring, calibration, code integration, and troubleshooting included with every purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow the MQ-135 Works\u003c\/h2\u003e\n\u003cp\u003eThe MQ-135 uses a tin dioxide (SnO2) semiconductor sensing element. In clean air, SnO2 has a relatively high electrical resistance. When target gases come into contact with the heated sensing surface, they react with adsorbed oxygen molecules, reducing the resistance of the SnO2 layer. This change in resistance is converted into an analog voltage signal through a simple voltage divider circuit with a load resistor. The higher the gas concentration, the lower the sensor resistance, and the higher the output voltage - which your microcontroller reads via an analog-to-digital converter (ADC) pin. A built-in heater coil maintains the sensing element at its optimal operating temperature (~200-300 degreesC) for consistent and accurate readings.\u003c\/p\u003e\n\n\u003ch2\u003eProject Ideas\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndoor Air Quality Monitor:\u003c\/strong\u003e Build a real-time air quality index (AQI) display using the MQ-135 with an Arduino and OLED\/LCD screen. Monitor CO2, ammonia, and smoke levels in your home, office, or classroom and trigger alerts when air quality degrades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart Ventilation System:\u003c\/strong\u003e Integrate the MQ-135 with a\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eProducts ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs technical support available?\u003c\/summary\u003e\n\u003cp\u003eYes, 24\/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return policy?\u003c\/summary\u003e\n\u003cp\u003e7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eBuy MQ-135 GAS SENSOR Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eMQ-135 GAS SENSOR\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003eMQ-135 GAS SENSOR\u003c\/strong\u003e with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.\u003c\/p\u003e\n\u003cp\u003eLooking to buy \u003cstrong\u003eMQ-135 GAS SENSOR\u003c\/strong\u003e at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43720265793699,"sku":"TES-EV2260","price":424.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/1674887587036-0a0b3c00f0c64fc2-490C6C87252556398716F0EAB1B563D7.jpg?v=1699528493","url":"https:\/\/www.theengineerstore.in\/zh-hant\/products\/mq-135-gas-sensor","provider":"The Engineer Store","version":"1.0","type":"link"}