TECHNICAL DATA MQ-135 GAS SENSOR

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www.DataSheet4U.com
HANWEI ELCETRONICS CO.,LTD
MQ-135
TECHNICAL DATA
http://www.hwsensor.com
MQ-135 GAS SENSOR
FEATURES
Wide detecting scope
Fast response and High sensitivity
Stable and long life
Simple drive circuit
APPLICATION
They are used in air quality control equipments for buildings/offices, are suitable for detecting
of NH3,NOx, alcohol, Benzene, smoke,CO2 ,etc.
SPECIFICATIONS
A. Standard work condition
Symbol
Vc
VH
RL
RH
PH
Parameter name
Circuit voltage
Heating voltage
Load resistance
Heater resistance
Heating consumption
Technical condition
5V±0.1
5V±0.1
can adjust
33Ω ±5%
less than 800mw
Remarks
AC OR DC
ACOR DC
Technical condition
-10℃…+45℃
-20℃…+70℃
less than 95%Rh
21%(standard condition)Oxygen
concentration can affect sensitivity
Remarks
Room Tem
B. Environment condition
Symbol
Tao
Tas
RH
O2
Parameter name
Using Tem
Storage Tem
Related humidity
Oxygen concentration
minimum value is
over 2%
C. Sensitivity characteristic
Symbol
Rs
Parameter name
Sensing
Resistance
α
(200/50)
NH3
Standard
Detecting
Condition
Preheat time
Concentration
Slope rate
Technical parameter
30KΩ -200KΩ
(100ppm NH3 )
≤ 0.65
Temp: 20℃±2℃
Humidity: 65%±5%
Vc:5V±0.1
Vh: 5V±0.1
Remark 2
Detecting concentration
scope:
10ppm-300ppm NH3
10ppm-1000ppm
Benzene
10ppm-300ppm
Alcohol
Over 24 hour
D. Structure and configuration, basic measuring circuit
1
2
3
4
5
6
7
8
9
Parts
Gas sensing
layer
Electrode
Electrode line
Heater coil
Tubular ceramic
Anti-explosion
network
Clamp ring
Resin base
Tube Pin
Materials
SnO2
Au
Pt
Ni-Cr alloy
Al2O3
Stainless steel gauze
(SUS316 100-mesh)
Copper plating Ni
Bakelite
Copper plating Ni
Fig.2
Fig. 1
Configuration A
Configuration B
AПт
AПт
Structure and configuration of MQ-135 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 heater are fixed into a
crust
made by plastic and stainless steel net. The heater provides necessary work conditions for work of
TEL: 86-371-67169070 67169080
FAX: 86-371-67169090
E-mail: [email protected]
www.DataSheet4U.com
HANWEI ELCETRONICS CO.,LTD
MQ-135
http://www.hwsensor.com
sensitive components. The enveloped MQ-135 have 6 pins ,4 of them are used to fetch signals, and other 2 are
used for providing heating current.
Electric parameter measurement circuit is shown as Fig.2
E. Sensitivity characteristic curve
Fig.2 sensitivity characteristics of the MQ-135
Rs/Ro
Fig.3 is shows the typical
sensitivity characteristics of
the MQ-135 for several gases.
MQ-135
10
in their: Temp: 20℃、
Humidity: 65%、
O2 concentration 21%
RL=20kΩ
Ro: sensor resistance at 100ppm of
NH3 in the clean air.
Rs: sensor resistance at various
concentrations of gases.
AI R
CO2
CO
ѕ ѕЖ «
NH4
ј Ч
± Ѕ
± ы
НЄ
1
ppm
0. 1
10
100
1000
1. 8
1. 6
33%RH
85%RH
Rs/Ro
1. 4
1. 2
1
0. 8
0. 6
degr ee
0. 2
0
- 10
Ro: sensor resistance at 100ppm of NH3 in air
at 33%RH and 20 degree.
Rs: sensor resistance at 100ppm of NH3
at different temperatures and humidities.
Fig.4
0. 4
- 20
Fig.4 is shows the typical dependence of
the MQ-135 on temperature and humidity.
0
10
20
30
40
50
60
SENSITVITY ADJUSTMENT
Resistance value of MQ-135 is difference to various kinds and various concentration gases. So,When using
this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for
100ppm NH3 or 50ppm Alcohol concentration in air and use value of Load resistancethat( RL) about 20 KΩ (10KΩ
to 47 KΩ ).
When accurately measuring, the proper alarm point for the gas detector should be determined after
considering the temperature and humidity influence.
TEL: 86-371-67169070 67169080
FAX: 86-371-67169090
E-mail: [email protected]

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