Specifications

Model: MQ-135
Sensor Type: Semiconductor Gas Sensor
Operating Voltage: 5V DC
Current Consumption: Approximately 150mA
Output Type: Analog (AO) and Digital (DO)
Digital Output: TTL Compatible
Analog Output: Variable Voltage
Comparator IC: LM393
Detection Range: 10–1,000 ppm (depending on gas type)
Detectable Gases: Ammonia (NH₃), Nitrogen Oxides (NOx), Alcohol, Benzene, Smoke, Carbon Dioxide (CO₂), and other harmful gases
Sensitivity: Adjustable via onboard potentiometer
Response Time: Fast response and recovery
Warm-up Time: 20–60 seconds (24-hour initial burn-in recommended for optimal accuracy)
Operating Temperature: -10°C to +50°C
Operating Humidity: 5%–95% RH
Module Dimensions: Approximately 32 × 22 × 27 mm
Weight: Approximately 8g
Mounting Type: PCB Module
Interface: 4-Pin (VCC, GND, AO, DO)

Package Contains

1Nos MQ-135 Air Quality Sensor Module