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MQ-135 Gas Sensor - Air Quality Detection for NH3, NOx, CO2, Benzene & Smoke
Monitor 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.
Specifications
| Sensor Model | MQ-135 |
| Sensor Type | Semiconductor (SnO2) Gas Sensor |
| Detectable Gases | NH3, NOx, CO2, Alcohol, Benzene, Smoke |
| Operating Voltage | 5V DC |
| Heater Voltage | 5V AC/DC |
| Heater Power Consumption | <= 950 mW |
| Load Resistance | Adjustable (recommended 10 KOhm - 47 KOhm) |
| Sensing Resistance Range | 2 KOhm - 20 KOhm (in 100 ppm NH3) |
| Detection Concentration Range | 10 ppm - 1000 ppm (varies by gas) |
| Output Type | Analog (voltage proportional to gas concentration) |
| Preheat Time | 24-48 hours (initial); ~2-5 minutes (subsequent use) |
| Operating Temperature | -20 degreesC to +50 degreesC |
| Operating Humidity | <= 95% RH (non-condensing) |
| Pin Configuration | 6 pins - H (Heater) x 2, A (Signal) x 2, B (Signal) x 2 |
| Sensor Dimensions | ~18 mm (diameter) x 21 mm (height) (standard TO-5 package) |
| Compatibility | Arduino, ESP32, ESP8266, Raspberry Pi (via ADC), STM32, PIC |
| Origin | Original / Authentic |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Why Choose the MQ-135 Gas Sensor?
- Multi-Gas Detection: Senses a broad spectrum of harmful gases including ammonia, carbon dioxide, benzene, alcohol, nitrogen oxides, and smoke in a single compact sensor.
- Simple Analog Output: Provides a straightforward analog voltage output that increases with gas concentration - easily read by any microcontroller's ADC pin without complex communication protocols.
- High Sensitivity & Fast Response: The tin dioxide (SnO2) sensing element offers rapid response and recovery times, enabling real-time air quality monitoring with reliable detection accuracy.
- Wide Detection Range: Capable of detecting gas concentrations from 10 ppm to 1000 ppm, suitable for both indoor air quality monitoring and industrial hazard detection.
- Low Cost, High Value: One of the most affordable and widely documented gas sensors available - backed by extensive community libraries, tutorials, and reference designs.
- Universal Microcontroller Compatibility: Works seamlessly with Arduino Uno/Nano/Mega, ESP32, ESP8266, Raspberry Pi (with external ADC like ADS1115), STM32, and virtually any 5V-compatible development board.
- 100% Authentic: Sourced directly from authorized distributors with verified authenticity - no clones or substandard components.
- Fast Shipping from Bengaluru: 1-5 day shipping, 7-8 day delivery across India; same-day dispatch available in Bengaluru.
- Expert Technical Support: Full guidance on wiring, calibration, code integration, and troubleshooting included with every purchase.
How the MQ-135 Works
The 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.
Project Ideas
- Indoor Air Quality Monitor: 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.
- Smart Ventilation System: Integrate the MQ-135 with a
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy MQ-135 GAS SENSOR Online in India
Purchase the MQ-135 GAS SENSOR online at The Engineer Store - 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 MQ-135 GAS SENSOR 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.
Looking to buy MQ-135 GAS SENSOR 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.
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MQ-135 Gas Sensor - Air Quality Detection for NH3, NOx, CO2, Benzene & Smoke
Monitor 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.
Specifications
| Sensor Model | MQ-135 |
| Sensor Type | Semiconductor (SnO2) Gas Sensor |
| Detectable Gases | NH3, NOx, CO2, Alcohol, Benzene, Smoke |
| Operating Voltage | 5V DC |
| Heater Voltage | 5V AC/DC |
| Heater Power Consumption | <= 950 mW |
| Load Resistance | Adjustable (recommended 10 KOhm - 47 KOhm) |
| Sensing Resistance Range | 2 KOhm - 20 KOhm (in 100 ppm NH3) |
| Detection Concentration Range | 10 ppm - 1000 ppm (varies by gas) |
| Output Type | Analog (voltage proportional to gas concentration) |
| Preheat Time | 24-48 hours (initial); ~2-5 minutes (subsequent use) |
| Operating Temperature | -20 degreesC to +50 degreesC |
| Operating Humidity | <= 95% RH (non-condensing) |
| Pin Configuration | 6 pins - H (Heater) x 2, A (Signal) x 2, B (Signal) x 2 |
| Sensor Dimensions | ~18 mm (diameter) x 21 mm (height) (standard TO-5 package) |
| Compatibility | Arduino, ESP32, ESP8266, Raspberry Pi (via ADC), STM32, PIC |
| Origin | Original / Authentic |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Why Choose the MQ-135 Gas Sensor?
- Multi-Gas Detection: Senses a broad spectrum of harmful gases including ammonia, carbon dioxide, benzene, alcohol, nitrogen oxides, and smoke in a single compact sensor.
- Simple Analog Output: Provides a straightforward analog voltage output that increases with gas concentration - easily read by any microcontroller's ADC pin without complex communication protocols.
- High Sensitivity & Fast Response: The tin dioxide (SnO2) sensing element offers rapid response and recovery times, enabling real-time air quality monitoring with reliable detection accuracy.
- Wide Detection Range: Capable of detecting gas concentrations from 10 ppm to 1000 ppm, suitable for both indoor air quality monitoring and industrial hazard detection.
- Low Cost, High Value: One of the most affordable and widely documented gas sensors available - backed by extensive community libraries, tutorials, and reference designs.
- Universal Microcontroller Compatibility: Works seamlessly with Arduino Uno/Nano/Mega, ESP32, ESP8266, Raspberry Pi (with external ADC like ADS1115), STM32, and virtually any 5V-compatible development board.
- 100% Authentic: Sourced directly from authorized distributors with verified authenticity - no clones or substandard components.
- Fast Shipping from Bengaluru: 1-5 day shipping, 7-8 day delivery across India; same-day dispatch available in Bengaluru.
- Expert Technical Support: Full guidance on wiring, calibration, code integration, and troubleshooting included with every purchase.
How the MQ-135 Works
The 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.
Project Ideas
- Indoor Air Quality Monitor: 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.
- Smart Ventilation System: Integrate the MQ-135 with a
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy MQ-135 GAS SENSOR Online in India
Purchase the MQ-135 GAS SENSOR online at The Engineer Store - 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 MQ-135 GAS SENSOR 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.
Looking to buy MQ-135 GAS SENSOR 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.