HANWEI ELECTRONICS CO.,LTD MQ-5 http://www.hwsensor.com
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com
TECHNICAL DATA
MQ-5 GAS SENSOR
FEATURES
* High sensitivity to LPG, natural gas , town 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
LPG, natural gas , town gas, 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
31±10%
Room Tem
P
H
Heating consumption less than 800mw
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 Remarks
Rs
Sensing Resistance
10KΩ- 60KΩ
(5000ppm methane )
α
(5000ppm/1000
ppm 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
LPG,LNG
Natural gas,
iso-butane, propane
Town gas
D. Strucyure and configuration, basic measuring circuit
Structure and configuration of MQ-5 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by
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
