MQ-9 Carbon Monoxide & Flammable Gas Sensor Module

MQ-9 gas sensor is SnO2, which has lower conductivity in clean air. It makes detection by cycling high and low temperature and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. Detects Methane, Propane, combustible gas, etc.

Title	Qty	Discount
Qty Discount	4 - 9	5% $7.55
Qty Discount	10 +	8% $7.31

SKU: N/A

Category:Gas

Description

Additional information

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MQ-9 sensor module is designed to detect carbon monoxide (CO) and flammable gases such as methane, LPG, and propane in the air.
It uses a sensitive SnO₂ semiconductor layer whose resistance changes with gas concentration, providing both analog and digital outputs for easy interfacing with controllers such as Arduino, ESP32, and Raspberry Pi.

Specifications:

Working voltage: 5V DC
Chip:LM393, ZYMQ-9 Carbon Monoxide & Flammable Gas
Interface: Analogue
Pin definition:
GND – Power supply
Vcc – Power supply
DO – Digital output
AO – Analog output
Dual signal output: (Analogue output and TTL level output)
Gas Detection: Carbon Monoxide & Flammable Gas
Fast response and high sensitivity
Heating resistance: 31Ω ± 3Ω
Heating current: ≤ 150mA
Heating voltage: 5.0V ± 0.1V / 1.5 ± 0.1V
Heating power: 350mW

Version 1: Thin Long with round end

1 x M2.5 Mounting Holes
20.2 x 49.8 x 17mm
Weight: 7.2grams ±5%

Version 2: Rectangle Red

4 x M2.5 Mounting Holes
26.2 x 40 x 18.2
Weight: 7.9 grams ±5%

Version 3: Blue Rectangle

4 x M2.5 Mounting Holes
20.50 x 32.5 x 21.0mm
Weight: 6.8 grams ±5%

Package Includes:

MQ-9 Carbon Monoxide & Flammable Gas Sensor Module

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