MQ-9 Carbon Monoxide Gas Sensor

Name: MQ-9 Carbon Monoxide Gas Sensor
SKU: TS-P1429
Availability: InStock

The SnO₂ sensing layer in the MQ-9 has high resistance in clean air. When carbon Monoxide or flammable gases are present, they react with oxygen ions on the sensor’s surface, reducing resistance and increasing the output voltage.

$3.95

10 in stock

This item: MQ-9 Carbon Monoxide Gas Sensor

10 in stock

$3.95

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Title	Qty	Discount
Qty Discount	4 - 9	5% $3.75
Qty Discount	10 +	8% $3.63

SKU: TS-P1429

Categories:Components & Parts, Gas Sensor

Description

Additional information

Applications

Support & Utility

Q & A

The MQ-9 Gas Sensor is a semiconductor sensor designed to detect carbon monoxide (CO) and combustible gases, such as methane (CH₄) and liquefied petroleum gas (LPG). It is commonly used in CO monitoring systems, gas leak detectors, and innovative safety devices.

The sensor’s sensitive layer, composed of SnO₂ (tin dioxide), changes its resistance when exposed to target gases, generating an analog voltage signal proportional to the gas concentration.

Specifications:

Gas sensor – MQ-9
High-sensitivity Gases: Carbon Monoxide (CO)
Low Sensitivity: methane, LPG, and flammable gases
Detection range: 10 – 10,000 ppm
Heater voltage (V<sub>H</sub>): 5V ±0.2V
Heater Resistance: 31 Ω ±3 Ω
Load Resistance: Adjustable (typically 20 kΩ)
Heater Consumption: ≤900 mW
Preheat time: 24 hours for best stability
Output type: Analog voltage (0–5V)
Dimensions: 18mm Diameter, 17mm High excluding pins, Pins – 6mm

Package Includes:

MQ-9 Carbon Monoxide Gas Sensor

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