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MQ-137 Schematic ( PDF Datasheet ) - HANWEI ELECTRONICS
| Teilenummer | MQ-137 |
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| Beschreibung | GAS SENSOR | |
| Hersteller | HANWEI ELECTRONICS | |
| Logo |  |
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Gesamt 2 Seiten 
HANWEI ELECTRONICS CO.,LTD
TECHNICAL DATA
MQ-137
http://www.hwsensor.com
MQ-137 GAS SENSOR
FEATURES
Fast response and High sensitivity
Stable and long life
Simple drive circuit
APPLICATION
They are used in air quality control equipments for buildings/factory, are suitable for detecting of NH3.
SPECIFICATIONS
A. Standard work condition
Symbol
Parameter name
Vc Circuit voltage
VH Heating voltage
RL Load resistance
RH Heater resistance
PH Heating consumption
B. Environment condition
Symbol
Parameter name
Tao Using Tem
Tas Storage Tem
RH Related humidity
O2 Oxygen concentration
C. Sensitivity characteristic
Symbol
Parameter name
Ro Sensing
Resistance
Technical condition
5V±0.1
5V±0.1
can adjust
31 5%
less than 800mw
Technical condition
-10 -45
-20 -70
less than 95%Rh
21%(standard condition)Oxygen
concentration can affect sensitivity
Technical parameter
900K -4900K
( in air )
Concent rat ion
(20/10)
Slope rate
0.65
NH3
Standard
Detecting
Condition
Temp: 20 2
Vc:5V±0.1
Humidity: 65%±5% Vh: 5V±0.1
Preheat time
Over 24 hour
D. Structure and configuration, basic measuring circuit
Remarks
AC OR DC
ACOR DC
Room Tem
Remarks
minimum value is
over 2%
Remarks
Detecting concentration
scope
5-200ppm NH3
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
Structure and configuration of MQ-137 gas sensor is show n as Fig. 1 (Configuration A or B), sensor composed
by micro ceramic tube, 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
TEL: 86-371-5333098 5333099 FAX: 86-371-5333090
E-mail: sensor@371.net
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| Seiten | Gesamt 2 Seiten | |
| PDF Download | [ MQ-137 Schematic.PDF ] | |
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