MQ-135 (MQ-ST) Air Quality Sensor Module
MQ135 has a high sensitivity to Ammonia, sulphide, benzene vapour, smoke and other harmful gas. It can detect various harmful gases, making it a cost-effective choice suitable for multiple applications
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The MQ-135 (MQ-ST) Air Quality Sensor Module is designed to detect a wide range of gases, making it ideal for monitoring air quality in various environments. It can sense gases such as ammonia (NH₃), nitrogen oxides (NOx), alcohol, benzene, smoke, and carbon dioxide (CO₂).
The module features the MQ-135 sensor, which provides an analog output proportional to the concentration of detected gases. It also includes an LM393 comparator IC and an adjustable potentiometer, providing a digital output with a user-set threshold.
Specifications: |
Version 1: Thin Long with round end
Version 2: Rectangle Red
Version 3: Blue or Black Rectangle
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Package Includes: |
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| Notes: |
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| Weight | 0.020 kg |
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| Dimensions | 3.2 × 2.2 × 2 cm |
| Model | Version 1, Version 2, Version 3 |
Product Applications
Gas and Atmosphere Sensor Comparison
| Sensor | Detects | Heater Voltage |
|---|---|---|
| MQ-2 | Methane, Butane, LPG, smoke | 5V |
| MQ-3 | Alcohol, Ethanol, smoke | 5V |
| MQ-4 | Methane, CNG Gas | 5V |
| MQ-5 | Natural gas, LPG | 5V |
| MQ-6 | LPG, butane gas | 5V |
| MQ-7 | Carbon Monoxide | Alternating 5V and 1.4V |
| MQ-8 | Hydrogen Gas | 5V |
| MQ-9 | Carbon Monoxide, flammable gasses. | Alternating 5V and 1.4V |
| MQ131 | Ozone | 6V |
| MQ135 | Air Quality (Benzene, Alcohol, smoke) | 5V |
| MQ136 | Hydrogen Sulfide gas | 5V |
| MQ137 | Ammonia | 5V |
| MQ138 | Benzene, Toluene, Alcohol, Acetone, Propane, Formaldehyde gas, Hydrogen | 5V |
| MQ214 | Methane, Natural gas | 6V |
| MQ216 | Natural gas, Coal gas | 5V |
| MQ303A | Alcohol, Ethanol, smoke | 0.9V |
| MQ306A | LPG, butane gas | 0.9V |
| MQ307A | Carbon Monoxide | Alternating 0.2V and 0.9V. |
| MQ309A | Carbon Monoxide, flammable gasses | Alternating 0.2V and 0.9V |
| MG811 | Carbon Dioxide (CO2) | 6V |
| AQ-104 | Air quality | – |
Development Resources: demo codes, schematics, datasheets, etc
MQ-135 Product Overview: MQ-135 Air Quality (Benzene, Alcohol, smoke) Sensor Module
Can be used for home and factory gas leakage monitoring devices, suitable for liquefied petroleum gas, butane, propane, methane, smoke, ammonia, sulfide, benzene, etc.
MQ-2 Product Overview:
Can be used in homes and factories leakage monitoring device suitable for the detection of natural gas, hydrogen, butane, propane, methane, smoke,etc.
MQ-3 Product Overview:
Gas sensor sensitivity to alcohol can resist the interference of gasoline, smoke, water vapour. The sensor can detect a variety of alcohol concentration in the atmosphere
Can be used for on-site detection of motor vehicle drivers (breathalyzer), but also for detecting other places of ethanol vapour, alcohol detection range: detection range 10 ~ 1000ppm
MQ-4 Product Overview:
MQ-4 Methane gas sensor of high sensitivity, propane, butane and has good sensitivity. The sensor can detect a variety of combustible gases, especially natural gas.
Can be used in homes and factories leakage monitoring device, suitable for the detection of liquefied petroleum gas, butane, propane, methane, smoke and the like.
MQ-5 Product Overview:
Main Chip: LM393, ZYMQ-5 gas sensor for liquefied petroleum gas (LPG), natural gas, city gas, best sensitivity.
Can be used for LPG detection, natural gas, coal gas monitoring device suitable for home or industrial. Excellent resistance to alcohol, smoke interference ability
MQ-6 Product Overview:
MQ-6 gas sensor for propane, butane, LPG high sensitivity, natural gas and has good sensitivity. The sensor can detect a variety of combustible gas, suitable for a variety of applications.
Suitable for home or industrial on LPG (liquefied petroleum gas), butane, propane, LNG (liquefied natural gas) detection devices. Excellent resistance to ethanol vapour, mist interference.
MQ-7 Product Overview:
High-low temperature cycling detection mode (1.5V heating) carbon monoxide detector, conductivity sensor with the increasing concentration of carbon monoxide gas in the air increases, high-temperature (5.0V heating) cleaning cryo-adsorption stray gases. Using a simple circuit to change the conductivity, the concentration of the gas is converted to the corresponding output signal. MQ-7 gas sensor has a high sensitivity for carbon monoxide, this sensor can detect a variety of gases containing carbon monoxide, is a low-cost sensor for a variety of applications
Can be used for home and factory gas leakage monitoring devices, suitable for liquefied petroleum gas, butane, propane, methane, smoke, etc.
MQ-8 Product Overview:
MQ-8 hydrogen gas sensor of high sensitivity monitoring of other hydrogen-containing gases.
Suitable for home or industrial hydrogen leak monitoring devices. Can not interfere with ethanol vapour, soot, carbon monoxide and other gases
MQ-9 Product Overview:
High-low temperature cycling detection mode (1.5V heating) detecting carbon monoxide sensor’s conductivity increases with the air of carbon monoxide gas concentration increases, spurious adsorption at high temperature (5.0V heat) detection of combustible gases methane, propane, and cryogenic cleaning gas. MQ-9 gas sensor for high carbon monoxide, methane, liquefied petroleum gas sensitivity, this sensor can detect a variety of carbon monoxide and combustible gas, is a low-cost sensor suitable for a variety of applications.
Current Product Support
| SKU | Product | Type | Download/View |
|---|---|---|---|
| OKY3339 | MQ-135 (MQ-ST) Air Quality Sensor Module - Data Sheet | Document | Download |
Q & A
Related Products
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MQ-9 Carbon Monoxide & Flammable Gas Sensor Module
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MQ-2 Methane, Butane, LPG, smoke Module
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