MQ135 Просмотр технического описания (PDF) - Futurlec

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MQ135

GAS SENSOR

Futurlec 

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

33Ω±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

30KΩ-200KΩ

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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