HANWEI ELETRONICS CO. LTD
MQ-B
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6-371- 67169070 67169080 FAX: 8647167169090 E-mail
HANWEI ELETRONICS CO.,LTD MQ-8 http://www.hwsensor.com
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com
TECHNICAL DATA
MQ-8 GAS SENSOR
FEATURES
* High sensitivity to Hydrogen (H2)
* Small sensitivity to alcohol, LPG,cooking fumes
* Stable and long life
APPLICATION
They are used in gas leakage detecting equipments in family and industry, are suitable for
detecting of Hydrogen (H2), avoid the noise of alcohol and cooking fumes, LPG,CO.
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
P
L Load resistance 10KΩ
R
H Heater resistance 31±5% Room Tem
P
H Heating consumption less than800mW
B. Environment condition
Symbol Parameter name Technical condition Remarks
Tao Using Tem -10℃-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 Ramark 2
Rs Sensing Resistance 10KΩ- 60KΩ
(1000ppm H2)
α
(1000ppm/
500ppmH2)
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：
100-10000ppm
Hydrogen (H2)
D. Structure and configuration, basic measuring circuit
Parts Materials
1 Gas sensing
layer SnO2
2 Electrode Au
3 Electrode line Pt
4 Heater coil Ni-Cr alloy
5 Tubular ceramic Al2O3
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
HANWEI ELETRONICS CO. LTD MQ-8 http://www.hwsensor.com
Structure and configuration of MQVX gas sensor is shown as Fig. l (C
micro ALzOs ceramic tube, Tin Dioxide (SnOz) sensitive layer. measu
crust made by plastic and stainless steel net. The heater provide
sensitive components. The enveloped MQVX have 6 pin ,4 of them are
for providing healing current.
Electric parameter measurement circuit is shown as Fig.2
E. Sensitivity characteristic curve
+
+
+
+
+
+
Fig 2 sensitivity characteristics of the MQV8
SENSITVITY ADJUSTMENT
Resistance value of MQVS is difference to various kinds and various conc
this components, sensitivity adjustment is very necessary. we recommend that yo
1000ppm H3 concentration in air and Ilse value of Load resistance ( RL) about 10
When accurately measuring, the proper alarm point for the gas detector sh
considering the temperature and humidity influence.
TEL: 86-371- 67169070 67169080 FAX: 8647147169090 sales©hwsensoncom
HANWEI ELETRONICS CO.,LTD MQ-8 http://www.hwsensor.com
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com
Structure and configuration of MQ-8 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
crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of
sensitive components. The enveloped MQ-8 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
Fig.2 sensitivity characteristics of the MQ-8
SENSITVITY ADJUSTMENT
Resistance value of MQ-8 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 H2 concentration in air and use value of Load resistance ( RL) about 10 KΩ(5KΩ to 33 KΩ).
When accurately measuring, the proper alarm point for the gas detector should be determined after
considering the temperature and humidity influence.
Fig.3 is shows the typical
sensitivity characteristics of
the MQ-8 for several gases.
in their: Temp: 20℃、
Humidity: 65%、
O
2 concentration 21%
RL=10kΩ
Ro: sensor resistance at 1000ppm
H2 in the clean air.
Rs:sensor resistance at various
concentrations of gases.
Fig.4 is shows the typical dependence of
the MQ-8 on temperature and humidity.
Ro: sensor resistance at 1000ppm of H2 in air at
33%RH and 20 degree.
Rs: sensor resistance at 1000ppm of H2 in air
at different temperatures and humidities.
Fig.4
MQ-8
0.01
0.1
1
10
100
100 1000 10000
ppm
Rs/Ro
H2
LPG
CH4
CO
alcohol
air
MQ-8
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
-100 1020304050
Temp
Rs/Ro
33%RH
85%RH
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ANALOG HYDROGEN GAS SENSOR (MQ8)