Product Description

Overview

This sensor module utilizes an MQ-2 as the sensitive component and has a protection resistor and an adjustable resistor on board. The MQ-2 gas sensor is sensitive to LPG, i-butane, propane, methane, alcohol, Hydrogen and smoke. It could be used in gas leakage detecting equipments in family and industry. The resistance of the sensitive component changes as the concentration of the target gas changes.

Features

• Continuous Analog output
• 3-pin interlock connector
• Low cost and compact size

Standard Working Condition

Symbol	Parameter Name	Technical Condition	Remarks
VC	Circuit voltage	5V±0.1	AC or DC
VH	Heating voltage	5V±0.1	AC or DC
RL	Load resistance	adjustable
RH	Heater resistance	33Kohm±5%	Room temperature
PH	Heating consumption	Less than 800mW

Environment Condition

Symbol	Parameter Name	Technical Condition	Remarks
TO	Operating Temp.	-20°C-50°C
TS	Storage Temp.	-20°C-70°C
RH	Relative Humidity	<95%
O2	Oxygen Concentration	21%(standard condition) Oxygen concentration can affect sensitivity	Minimum value is 2%

Sensitivity Characteristics

Symbol	Parameter Name	Technical Condition	Remarks
RS	Sensor Resistance	3Kohm-30Kohm (1000ppm iso-butane)	Detecting concentration scope: 200ppm-5000ppm LPG and propane 300ppm-5000ppm butane 5000ppm-20000ppm methane 300ppm-5000ppm H2 100ppm-2000ppm Alcohol
α (3000ppm/1000ppm iso-butane)	Concentration slope rate	≤0.6
Standard detecting Condition	Temp.: 20°C±2°C VC: 5V±0.1 Humidity:65%±5% VH:5V±0.1
Preheating Time	Over 24 hours

Resources

• Product Datasheet (including Arduino sample code)
• MQ-2 Datasheet

Demo Output

Demo output as the sensor approaches a lit cigarette