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MQ-4 Datasheet PDF - HANWEI ELETRONICS

Part Number MQ-4
Description GAS SENSOR
Manufacturers HANWEI ELETRONICS 
Logo HANWEI ELETRONICS Logo 



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MQ-4 datasheet, circuit
HANWEI ELECTRONICS
MQ-4
www.hwsensor.com
TECHNICAL DATA
MQ-4 GAS SENSOR
FEATURES
* High sensitivity to CH4Natural 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
CH4,Natural gas.LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke.
SPECIFICATIONS
A. Standard work condition
Symbol
Vc
VH
PL
RH
Parameter name
Circuit voltage
Heating voltage
Load resistance
Heater resistance
Technical condition
5V±0.1
5V±0.1
20KΩ
33Ω±5%
Remarks
AC OR DC
ACOR DC
Room Tem
PH Heating consumption
B. Environment condition
less than 750mw
Symbol
Tao
Parameter name
Using Tem
Technical condition
-10-50
Remarks
Tas Storage Tem
-20-70
RH Related humidity
less than 95%Rh
O2
Oxygen concentration
21%(standard condition)Oxygen
minimum value is
concentration can affect sensitivity over 2%
C. Sensitivity characteristic
Symbol
Rs
Parameter name
Sensing Resistance
Technical parameter
10KΩ- 60KΩ
(1000ppm CH4 )
Ramark 2
Detecting concentration
scope
200-10000ppm
α
(1000ppm/
Concentration slope rate
0.6
CH4 , natural gas
5000ppm CH4)
Standard
detecting
condition
Temp: 20℃±2Vc:5V±0.1
Humidity: 65%±5% Vh: 5V±0.1
Preheat time
Over 24 hour
D. Strucyure and configuration, basic measuring circuit
Parts
1 Gas sensing
layer
2 Electrode
3 Electrode line
4 Heater coil
5 Tubular ceramic
6 Anti-explosion
network
7 Clamp ring
8 Resin base
9 Tube Pin
Materials
SnO2
Au
Pt
Ni-Cr alloy
Al2O3
Stainless steel gauze
(SUS316 100-mesh)
Copper plating Ni
Bakelite
Copper plating Ni
Configuration A
Fig. 1
Configuration B
Fig.2
TEL:86-371-67169080
A
FAX: 86-371-67169090
A
E-mail: sales@hwsensor.com

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