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MQ-138 Schematic ( PDF Datasheet ) - HANWEI ELECTRONICS

Teilenummer MQ-138
Beschreibung GAS SENSOR
Hersteller HANWEI ELECTRONICS
Logo HANWEI ELECTRONICS Logo 




Gesamt 2 Seiten
MQ-138 Datasheet, Funktion
HANWEI ELECTRONICS CO.,LTD
TECHNICAL DATA
MQ-138
http://www.hwsensor.com
MQ-138 GAS SENSOR
FEATURES
Wide detecting scope
Fast response and High sensitivity
Stable and long life
Simple drive circuit
APPLICATION
They are used in Breath alcohol detector, solvent detectors ,Air quality control equipments for
buildings/offices, are suitable for detecting of n-Hexane, Benzene, NH3, alcohol, ,smoke, CO ,etc.
SPECIFICATIONS
A. Standard work condition
Symbol
Vc
VH
Parameter name
Circuit voltage
Heating voltage
Technical condition
5V±0.1
5V±0.1
Remarks
AC OR DC
ACOR DC
RL Load resistance
RH Heater resistance
can adjust
31Ω±3Ω
Room Tem
PH Heating consumption less than 850mw
B. Environment condition
Symbol
Parameter name
Technical condition
Remarks
Tao Using Tem
-10-45
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
over 2%
sensitivity
C. Sensitivity characteristic
Symbol
Parameter name
Technical parameter
Remarks
Rs Sensing
Resistance
20KΩ-200KΩ
(1000ppm Benzene )
Detecting concentration
scope
10ppm-1000ppm
α
(200/50)
Concentration
Slope rate
0.65
Benzene
10ppm-1000ppm
NH3
Standard
Detecting
Condition
Temp: 20℃±2Vc:5V±0.1
Humidity: 65%±5% Vh: 5V±0.1
Alcohol
10ppm-3000ppm NH3
Preheat time
Over 24 hours
D. Structure 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
AA
Structure and configuration of MQ-138 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
TEL: 86-371-67169070 67169080
FAX: 86-371-67169090
E-mail: sales@hwsensor.com





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