Gas Sensor
Description
HANWEI ELETRONICS CO.
,LTD
MQ-2
http://www.
hwsensor.
com
TECHNICAL
DATA
MQ-2
GAS SENSOR
FEATURES Wide detecting scope Fast response and High sensitivity Stable and long life Simple drive circuit APPLICATION They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke.
SPECIFICATIONS A.
Standard work condition
Symbol Vc VH www.
DataSheet4U.
com RL RH PH Symbol Tao Tas RH O2 Parameter name Circuit voltage Heating voltage Load resistance Heater resistance Heating consumption Technical condition 5V±0.
1 5V±0.
1 can adjust 33Ω±5% less than 800mw Technical condition -20℃-50℃ -20℃-70℃ less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 3KΩ-30KΩ (1000ppm iso-butane ) Remarks AC OR DC ACOR DC Room Tem
B.
Environment condition
Parameter name Using Tem Storage Tem Related humidity Oxygen concentration Remarks
minimum value is over 2% Remarks Detecting concentration scope： 200ppm-5000ppm LPG and propane 300ppm-5000ppm butane 5000ppm-20000ppm methane 300ppm-5000ppm H2 100ppm-2000ppm Alcohol
C.
Sensitivity characteristic
Symbol Rs Parameter name Sensing Resistance Concentration Slope rate Temp: 20℃±2℃ Humidity: 65%±5%
α (3000/1000) isobutane Standard Detecting Condition Preheat time
≤0.
6 Vc:5V±0.
1 Vh: 5V±0.
1
Over 24 hour
D.
Structure and configuration, basic measuring circuit
1 2 3 4 5 6 7 8 9
Parts Gas sensing layer Electrode Electrode line Heater coil Tubular ceramic Anti-explosion network Clamp ring Resin base Tube Pin
Materials SnO2 Au Pt Ni-Cr alloy Al2O3 Stainless steel gauze (SUS316 100-mesh) Copper plating Ni Bakelite Copper plating Ni
Fig.
2 Fig.
1
Configuration A
Configuration B
A
A
Structure and configuration of MQ-2 gas sensor is shown as Fig.
1 (Configuration A or B), sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a
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