Data Sheet

Henan Hanwei Electronics Co., Ltd www.hwsensor.com
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MQ-4 Semiconductor Sensor for Natural Gas
Sensitive material of MQ-4 gas sensor is SnO
2,
which with lower conductivity in clean air. When the
target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration
rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of
gas concentration.
MQ-4 gas sensor has high sensitity to Methane, also to Propane and Butane. The sensor could be
used to detect different combustible gas, especially Methane, it is with low cost and suitable for different
application.
Character
Configuration
* Good sensitivity to Combustible gas in wide range
* High sensitivity to Natural gas
* Long life and low cost
* Simple drive circuit
Application
* Domestic gas leakage detector
* Industrial Combustible gas detector
* Portable gas detector
Technical
Data Basic test loop
The above is basic test circuit of the sensor.
The sensor need to be put 2 voltage,
heater voltage（VH） and test voltage（VC）.
VH used to supply certified working
temperature to the sensor, while VC used
to detect voltage (VRL) on load resistance
（RL）whom is in series with sensor. The
sensor has light polarity, Vc need DC
power. VC and VH could use same power
circuit with precondition to assure
performance of sensor. In order to make
the sensor with better performance,
suitable RL value is needed:
Power of Sensitivity body(Ps):
Model No. MQ-4
Sensor Type Semiconductor
Standard Encapsulation Bakelite (Black Bakelite)
Detection Gas Natural gas/ Methane
Concentration
300-10000ppm
( Natural gas / Methane)
Loop Voltage V
c
≤24V DC
Heater Voltage V
H
5.0V±0.2V ACorDC
Circuit
Load
Resistance
R
L
Adjustable
Heater
Resistance
R
H
31Ω±3Ω（Room Tem.）
Heater
consumption
P
H
≤900mW
Sensing
Resistance
R
s
2KΩ-20KΩ(in 5000ppm CH
4
)
Sensitivity S Rs(in air)/Rs(5000ppm CH
4
)≥5
Character
Slope α ≤0.6(R
5000ppm
/R
3000ppm
CH
4
)
Tem. Humidity
20℃±2℃；65%±5%RH
Standard test circuit
Vc:5.0V±0.1V；
V
H
: 5.0V±0.1V
Condition
Preheat time Over 48 hours
Vc
V
H
GND
R
L
V
RL