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ETC |
MQ-6 Semiconductor Sensor for LPG
Sensitive material of MQ-6 gas sensor is SnO2, 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-6 gas sensor has high sensitity to Propane, Butane and LPG, also response to Natural gas. The
sensor could be used to detect different combustible gas, especially Methane, it is with low cost and
suitable for different application.
Character
* Good sensitivity to Combustible gas in wide range
* High sensitivity to Propane, Butane and LPG
* Long life and low cost
* Simple drive circuit
Configuration
Application
* Domestic gas leakage detector
* Industrial Combustible gas detector
* Portable gas detector
Technical Data
Basic test loop
Model No.
Sensor Type
Standard Encapsulation
Detection Gas
Concentration
Loop Voltage Vc
Circuit
Heater Voltage
Load
Resistance
VH
RL
Heater
Resistance
RH
Character
Heater
consumption
Sensing
Resistance
PH
Rs
Sensitivity S
Slope
α
Tem. Humidity
Condition Standard test circuit
Preheat time
MQ-6
Semiconductor
Bakelite (Black Bakelite)
Isobutane, Butane, LPG
300-10000ppm
( Butane, Propane, LPG)
≤24V DC
5.0V±0.2V ACorDC
Adjustable
31Ω±3Ω(Room Tem.)
≤900mW
2KΩ-20KΩ(in 2000ppm C3H8)
Rs(in air)/Rs(1000ppm C4H10)≥5
≤0.6( R /R2000ppm 1000ppm LPG )
20℃±2℃;65%±5%RH
Vc:5.0V±0.1V;
VH: 5.0V±0.1V
Over 48 hours
Vc VRL
RL
VH
GND
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=Vc2×Rs/(Rs+RL)2
Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL
Sensitivity Characteristics
Influence of Temperature/Humidity
Fig.1 shows the typical sensitivity characteristics of
the MQ-6, ordinate means resistance ratio of the sensor
(Rs/Ro), abscissa is concentration of gases. Rs means
resistance in different gases, Ro means resistance of
sensor in 1000ppm LPG. All test are under standard
test conditions.
Fig.2 shows the typical temperature and humidity
characteristics. Ordinate means resistance ratio
of the sensor (Rs/Ro), Rs means resistance of sensor
in 1000ppm Methane under different tem. and humidity.
Ro means resistance of the sensor in environment of
1000ppm Propane, 20℃/65%RH
Structure and configuration
Structure and configuration of MQ-6 gas sensor is shown as Fig. 3, sensor composed by micro AL2O3 ceramic tube, Tin
Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel
net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-4 have 6 pin, 4
of them are used to fetch signals, and other 2 are used for providing heating current.
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