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MQ135 View Datasheet(PDF) - Futurlec

Part NameDescriptionManufacturer
MQ135 GAS SENSOR Futurlec
Futurlec Futurlec
MQ135 Datasheet PDF : 2 Pages
1 2
TECHNICAL DATA
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
Parameter name
Technical condition
Remarks
Vc
Circuit voltage
5V±0.1
AC OR DC
VH
Heating voltage
RL
Load resistance
RH
Heater resistance
PH
Heating consumption
B. Environment condition
5V±0.1
can adjust
33±5%
less than 800mw
ACOR DC
Room Tem
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 sensitivity over 2%
C. Sensitivity characteristic
Symbol
Rs
Parameter name
Sensing
Technical parameter
30K-200K
Ramark 2
Detecting concentration
α
(200/50)
NH3
Standard
Detecting
Resistance
(100ppm NH3 )
Concentration
Slope rate
0.65
Temp: 20 ±2 Vc:5V±0.1
Humidity: 65%±5% Vh: 5V±0.1
scope
10ppm-300ppm NH3
10ppm-1000ppm
Benzene
10ppm-300ppm
Alcohol
Condition
Preheat time
Over 24 hour
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
AÏ ò
AÏ ò
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 sensitive
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