Data Sheet

HANWEI ELECTRONICS MQ-4 www.hwsensor.com
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TECHNICAL DATA MQ-4 GAS SENSOR
FEATURES
* High sensitivity to CH
4
，Natural gas.
* Small sensitivity to alcohol, smoke.
* Fast response . * 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
CH
4
,Natural gas.LNG, avoid the noise of alcohol and cooking fumes and cigarette 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
P
L
Load resistance
20KΩ
R
H
Heater resistance
33Ω±5%
Room Tem
P
H
Heating consumption less than 750mw
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 CH
4
)
α
(1000ppm/
5000ppm CH
4
)
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：
200-10000ppm
CH
4
, natural gas
D. Strucyure and configuration, basic measuring circuit
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