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MQ-2 View Datasheet(PDF) - Unspecified

Part NameDescriptionManufacturer
MQ-2 GAS SENSOR ETC
Unspecified 
MQ-2 Datasheet PDF : 2 Pages
1 2
HANWEI ELETRONICS CO.,LTD
MQ-2
http://www.hwsensor.com
crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of
sensitive components. The enveloped MQ-2 have 6 pin ,4 of them are used to fetch signals, and other 2 are used
for providing heating current.
Electric parameter measurement circuit is shown as Fig.2
E. Sensitivity characteristic curve
MQ-2
10
1
H2
LPG
CH4
CO
alcohol
smoke
propane
air
0.1
100
1000
Fig.2 sensitivity characteristics of the MQ-2
Fig.3 is shows the typical
sensitivity characteristics of
the MQ-2 for several gases.
in their: Temp: 20℃、
Humidity: 65%
O2 concentration 21%
RL=5kΩ
Ro: sensor resistance at 1000ppm of
H2 in the clean air.
Rs:sensor resistance at various
concentrations of gases.
ppm
10000
1.8
1.6
1.4
1.2
33%RH
85%RH
Fig.4 is shows the typical dependence of
the MQ-2 on temperature and humidity.
1
Ro: sensor resistance at 1000ppm of H2 in air
0.8
at 33%RH and 20 degree.
0.6
Rs: sensor resistance at 1000ppm of H2
0.4
Fig.4
at different temperatures and humidities.
0.2
degree
0
-20 -10
0
10
20
30
40
50
60
SENSITVITY ADJUSTMENT
Resistance value of MQ-2 is difference to various kinds and various concentration gases. So,When using
this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for
1000ppm liquified petroleum gas<LPG>,or 1000ppm iso-butane<i-C4H10>concentration in air and use value of
Load resistance that( RL) about 20 KΩ(5KΩ to 47 KΩ).
When accurately measuring, the proper alarm point for the gas detector should be determined after
considering the temperature and humidity influence.
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090
E-mail: sales@hwsensor.com
Direct download click here

 

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