Manualshelf

Data Sheet

ManualsBrandsPololu ManualsGas SensorsFlammable Gas & Smoke Sensor MQ-2
123
MQ-2 Semiconductor Sensor for Combustible Gas
Sensitive material of MQ-2 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-2 gas sensor has high sensitity to LPG, Propane and Hydrogen, also could be used to Methane
and other combustible steam, it is with low cost and suitable for different application.
Character
Configuration
*Good sensitivity to Combustible gas in wide range
* High sensitivity to LPG, Propane and Hydrogen
* 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
T
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):
Ps=Vc
2
×Rs/(Rs+RL)
2
Model No. MQ-2
Sensor Type Semiconductor
Standard Encapsulation Bakelite (Black Bakelite)
Detection Gas Combustible gas and smoke
Concentration
300-10000ppm
( Combustible gas)
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 2000ppm C
3
H
8
)
Sensitivity S
Rs(in air)/Rs(1000ppm
isobutane
)≥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

Summary of content (3 pages)