Data Sheet

HANWEI ELETRONICS CO.,LTD MQ-2 http://www.hwsensor.com
TEL: [phone] 67169080 FAX: [phone] E-mail: [e-mail]
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 Parameter name Technical condition Remarks
Vc Circuit voltage 5V±0.1 AC OR DC
V
H
Heating voltage 5V±0.1 ACOR DC
R
L
Load resistance can adjust
R
H
Heater resistance
33Ω±5%
Room Tem
P
H
Heating consumption less than 800mw
B. Environment condition
Symbol Parameter name Technical condition Remarks
Tao Using Tem
-20℃-50℃
Tas Storage Tem
-20℃-70℃
R
H
Related humidity less than 95%Rh
O
2
Oxygen concentration 21%(standard condition)Oxygen
concentration can affect sensitivity
minimum value is
over 2%
C. Sensitivity characteristic
Symbol Parameter name Technical parameter Remarks
Rs Sensing
Resistance
3KΩ-30KΩ
(1000ppm iso-butane )
α
(3000/1000)
isobutane
Concentration
Slope rate
≤0.6
Standard
Detecting
Condition
Temp: 20℃±2℃ Vc:5V±0.1
Humidity: 65%±5% Vh: 5V±0.1
Preheat time Over 24 hour
Detecting concentration
scope：
200ppm-5000ppm
LPG and propane
300ppm-5000ppm
butane
5000ppm-20000ppm
methane
300ppm-5000ppm H
2
100ppm-2000ppm
Alcohol
D. Structure and configuration, basic measuring circuit
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
Parts Materials
1 Gas sensing
layer
SnO
2
2 Electrode Au
3 Electrode line Pt
4 Heater coil Ni-Cr alloy
5 Tubular ceramic Al
2
O
3
6 Anti-explosion
network
Stainless steel gauze
(SUS316 100-mesh)
7 Clamp ring Copper plating Ni
8 Resin base Bakelite
9 Tube Pin Copper plating Ni
A向
A向
Fig. 1
Configuration A Configuration B
Fig.2