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MQ-3 Schematic ( PDF Datasheet ) - ETC
| Teilenummer | MQ-3 |
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| Beschreibung | Semiconductor Sensor | |
| Hersteller | ETC | |
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Gesamt 3 Seiten 
MQ-3 Semiconductor Sensor for Alcohol
Sensitive material of MQ-3 gas sensor is SnO2, which with lower conductivity in clean air. When the
target alcohol 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-3 gas sensor has high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke
and vapor. The sensor could be used to detect alcohol with different concentration, it is with low cost and
suitable for different application.
Character
* Good sensitivity to alcohol gas
* Long life and low cost
* Simple drive circuit
Configuration
Application
* Vehicel alcohol detector
* Portable alcohol 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
Heater
consumption
PH
Character
Sensing
Resistance
Rs
Sensitivity S
Slope
α
Tem. Humidity
Condition Standard test circuit
Preheat time
Ps=Vc2×Rs/(Rs+RL)2
MQ-3
Semiconductor
Bakelite (Black Bakelite)
Alcohol gas
0.04-4mg/l alcohol
≤24V DC
5.0V±0.2V AC or DC
Adjustable
31Ω±3Ω（Room Tem.）
≤900mW
2KΩ-20KΩ(in 0.4mg/l alcohol )
Rs(in air)/Rs(0.4mg/L
Alcohol)≥5
≤0.6(R300ppm/R100ppm Alcohol)
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):
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| Seiten | Gesamt 3 Seiten | |
| PDF Download | [ MQ-3 Schematic.PDF ] | |
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