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MQ138 Schematic ( PDF Datasheet ) - Hanwei
| Teilenummer | MQ138 |
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| Beschreibung | Semiconductor Sensor | |
| Hersteller | Hanwei | |
| Logo |  |
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Gesamt 3 Seiten 
MQ138 Semiconductor Sensor for Organic Steam
Sensitive material of MQ138 gas sensor is SnO2, which with lower conductivity in clean air. When
the target Organic Steam 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.
MQ138 gas sensor has high sensitity to Toluene, Acetone, Ethanol and Formaldehyde, also to other
organic steam. The sensor could be used to detect different organic steam, it is with low cost and
suitable for different application.
Character
* Good sensitivity to Organic Steam
* High sensitivity to Toluene, Acetone and Ethanol
* Long life and low cost
* Simple drive circuit
Configuration
Application
* Domestic Organic steam detector
* Industrial Organic steam detector
* Portable gas detector
Technical Data
Basic test loop
Model No.
MQ138
Vc
VRL
Sensor Type
Semiconductor
Standard Encapsulation
Bakelite (Black Bakelite)
Detection Gas
Toluene, Acetone, Ethanol, H2
Concentration
5-500ppm
Circuit
Loop Voltage
Heater Voltage
Load
Resistance
Vc
VH
RL
≤24V DC
5.0V±0.2V AC or DC
Adjustable
Heater
Resistance
RH
31Ω±3Ω（Room Tem.）
Character
Heater
consumption
Sensing
Resistance
PH ≤900mW
Rs 2KΩ-20KΩ(in 50ppm Toluene )
Sensitivity S Rs(in air)/Rs(50ppm Toluene)≥3
Slope
α ≤0.6≤0.6(R100ppm/R50ppm Toluene)
Tem. Humidity
20℃±2℃；65%±5%RH
Condition Standard test circuit
Vc: 5.0V±0.1V；
VH: 5.0V±0.1V
Preheat time
Over 48 hours
Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2
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:
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| Seiten | Gesamt 3 Seiten | |
| PDF Download | [ MQ138 Schematic.PDF ] | |
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