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MQ135 Air Quality Sensor | Gas Sensor for CO2, NH3, NOx Detection

2,124.00 Price With Tax

Buy MQ135 Air Quality Sensor for detecting CO₂, NH₃, NOx, and other gases. Ideal for Arduino, IoT, indoor air quality monitoring, and environmental sensing.

Available to Order lead time minimum 5-7 Weeks , Minimum quantity to order 5 pcs.

SKU: AA-AIR-MQ135-SEMI Categories: , Brand:

Parameter

Value

Product Model

MQ-135

Gas Detected

CO₂, NH₃, NOx, alcohol, benzene

Sensor Type

Semiconductor (SnO₂)

Detection Range

Wide (varies by gas)

Output Signal

Analog / Digital (module)

Operating Voltage

5V

Preheat Time

≥ 24 hours (recommended)

Response Time

≤ 30 seconds

Operating Temperature

-10°C to +50°C

Humidity Range

15% to 90% RH

Lifespan

Long

15 Days Warranty

This product comes with a 15-day warranty starting from the date of delivery. The warranty covers manufacturing defects only. If a defect is confirmed, the item will be replaced.

Warranty will not apply if:

  • The product has been misused, dropped, or damaged.
  • It has been exposed to water, fire, chemicals, or static discharge.
  • It has been tampered with, soldered, or altered in any way.

The MQ-135 Gas Sensor is a versatile semiconductor-based air quality sensor designed to detect a variety of harmful gases such as carbon dioxide (CO₂), ammonia (NH₃), nitrogen oxides (NOx), alcohol, benzene, and smoke.

Built using tin dioxide (SnO₂) sensing material, the MQ-135 offers high sensitivity to multiple gases, making it an excellent choice for indoor air quality monitoring and IoT-based environmental systems.

Key Features

  • Detects multiple gases: CO₂, NH₃, NOx, alcohol, benzene, smoke
  • Semiconductor (SnO₂) sensing technology
  • Analog and digital output (module version)
  • Adjustable sensitivity via onboard potentiometer
  • Fast response and recovery time
  • Cost-effective and widely used sensor
  • Long operational life
  • Easy integration with microcontrollers

Applications

  • Indoor air quality monitoring
  • Smart home automation systems
  • Air pollution detection systems
  • IoT-based environmental monitoring
  • Industrial air quality monitoring
  • Educational and DIY electronics projects

Benefits

  • Multi-gas detection with a single sensor
  • Affordable solution for air quality monitoring
  • Easy integration with Arduino, ESP32, Raspberry Pi
  • Adjustable sensitivity for flexible applications
  • Suitable for DIY and IoT projects

Why Choose MQ-135 Sensor?

The MQ-135 is one of the most popular sensors for air quality monitoring, offering multi-gas detection at a low cost. It is ideal for non-critical monitoring applications, especially in smart home and IoT environments.

Installation & Usage

  • Power with 5V supply
  • Allow preheat time (24 hours recommended)
  • Read analog output via ADC or digital output
  • Adjust sensitivity using onboard potentiometer
  • Calibrate according to target gas

Safety Information

MQ-135 is a general-purpose sensor and not highly selective. For critical safety applications, use specialized sensors.

Packaging Includes

  • 1 × MQ-135 Air Quality Gas Sensor (module or bare sensor as per variant)
Weight 0.100 kg
Dimensions 12 × 6 × 6 cm

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