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MQ135 View Datasheet(PDF) - Futurlec

Part NameDescriptionManufacturer
MQ135 GAS SENSOR Futurlec
Futurlec Futurlec
MQ135 Datasheet PDF : 2 Pages
1 2
components. The enveloped MQ-135 have 6 pin ,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
10
MQ-135
Fig.3 is shows the typical
sensitivity characteristics of
the MQ-135 for several gases.
in their: Temp: 20
AI R
Humidity: 65%
CO2
O2 concentration 21%
CO
RL=20k
¾ ¾Æ«
Ro: sensor resistance at 100ppm of
NH4
¼ ±× ½
± Íû ª
NH3 in the clean air.
Rs:sensor resistance at various
concentrations of gases.
1
0. 1
10
ppm
100
1000
1. 8
1. 6
1. 4
33%RH
Fig.4 is shows the typical dependence of
the MQ-135 on temperature and humidity.
1. 2
85%RH Ro: sensor resistance at 100ppm of NH3 in air
1
at 33%RH and 20 degree.
0. 8
Rs: sensor resistance at 100ppm of NH3
0. 6
at different temperatures and humidities.
0. 4
Fig.4
0. 2
degr ee
0
- 20 - 10
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 K(10K
to 47 K).
When accurately measuring, the proper alarm point for the gas detector should be determined after
considering the temperature and humidity influence.
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