Zhengzhou Winsen Electronics Technology Co., Ltd
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Leading gas sensing solutions supplier in China!
MQ-2 Semiconductor Sensor for Flammable Gas
Profile
Sensitive material of MQ-2 gas sensor is SnO
2,
which
with lower conductivity in clean air. When the target
flammable gas exist, the sensor’s conductivity gets
higher along with the gas concentration rising. Users
can convert the change of conductivity to correspond
output signal of gas concentration through a simple
circuit.
MQ-2 gas sensor has high sensitivity to propane and
smoke, also can detect the natural gas and other
flammable steam well. It is with low cost and suitable
for different applications of detecting kinds of
flammable gases.
Features
It has good sensitivity to propane, smoke &etc in wide range, and has advantages such as long lifespan,
low cost and simple drive circuit &etc.
Main Applications
It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas
detector.
Technical Parameters Stable.1
Model
MQ-2
Sensor Type
Semiconductor
Standard Encapsulation
Bakelite, Metal cap
Target Gas
Flammable gas, smoke
Detection range
300
～
10000ppm(flammable gas)
Standard Circuit
Conditions
Loop Voltage
V
c
≤24V DC
Heater Voltage
V
H
5.0V±0.1V AC or DC
Load Resistance
R
L
Adjustable
Sensor character
under standard
test conditions
Heater Resistance
R
H
29Ω±3Ω
（
room tem.
）
Heater consumption
P
H
≤950mW
Sensitivity
S
Ro(in air)/Rs(2000ppm C
3
H
8
)≥5
Output Voltage
Vs
2.5V
～
4.0V
（
in 2000ppmC
3
H
8
）
Concentration Slope
α
≤0.6(R
3000ppm
/R
1000ppm
C
3
H
8
)
Standard test
conditions
Tem. Humidity
20
℃
±2
℃；
55%±5%RH
Standard test circuit
Vc:5.0V±0.1V
；
V
H
:5.0V±0.1V
Preheat time
Over 48 hours
Fig1.Sensor S
tructure
Unit: mm
