MQ-2 View Datasheet(PDF) - Unspecified

Part Name

Description

View to exact match

MQ-2

GAS SENSOR

Unspecified 

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

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