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MQ138

Hanwei
Part Number MQ138
Manufacturer Hanwei
Description Semiconductor Sensor
Published Feb 25, 2015
Detailed Description MQ138 Semiconductor Sensor for Organic Steam Sensitive material of MQ138 gas sensor is SnO2, which with lower conductiv...
Datasheet PDF File MQ138 PDF File

MQ138
MQ138


Overview
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...


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