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MQ-9 PDF даташит

Спецификация MQ-9 изготовлена ​​​​«HANWEI ELETRONICS» и имеет функцию, называемую «GAS SENSOR».

Детали детали

Номер произв MQ-9
Описание GAS SENSOR
Производители HANWEI ELETRONICS
логотип HANWEI ELETRONICS логотип 

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MQ-9 Даташит, Описание, Даташиты
HANWEI ELETRONICS CO.,LTD
MQ-9
http://www.hwsensor.com
TECHNICAL DATA
MQ-9 GAS SENSOR
FEATURES
* High sensitivity to carbon monoxide and CH4LPG.
* Stable and long life
APPLICATION
They are used in gas detecting equipment for carbon monoxide and CH4LPG in family
and industry or car.
SPECIFICATIONS
A. Standard work condition
Symbol
Vc
VH (H)
VH (L)
Parameter name
circuit voltage
Heating voltage (high)
Heating voltage (low)
technical condition
5V±0.1
5V±0.1
1.4V±0.1
Remark
AC or DC
AC or DC
AC or DC
RL Load resistance
Can adjust
RH
TH (H)
TH (L)
Heating resistance
Heating time (high)
Heating time (low)
33Ω ±5%
60±1 seconds
90±1 seconds
Room temperature
Ps Heating consumption Less than 340mw
b. Environment conditions
Symbol
Tao
Tas
RH
O2
Parameters
Using temperature
Storage temperature
Relative humidity
Oxygen concentration
c. Sensitivity characteristic
Technical conditions
-20+50℃
-20℃+50℃
Less than 95%RH
21%(stand condition)
the oxygen concentration can
affect the sensitivity
characteristic
Remark
Advice using scope
Minimum value is over 2%
symbol
Rs
а
(300/100ppm)
Standard working
condition
Preheat time
Parameters
Surface resistance
Of sensitive body
Concentration slope rate
Technical parameters
2-20k
Less than 0.5
Remark
In 100ppm
Carbon Monoxide
Rs (300ppm)/Rs(100ppm)
Temperature -20℃±2℃ relative humidity 65%±5% RL:10KΩ ±5%
Vc:5V±0.1V VH:5V±0.1V VH:1.4V±0.1V
No less than 48 hours
Detecting range:20ppm-2000ppm carbon monoxide
500ppm-10000ppm CH4
500ppm-10000ppm LPG
D. Structure and configuration, basic measuring circuit
Structure and configuration of MQ-9 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
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090









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MQ-9 Даташит, Описание, Даташиты
HANWEI ELETRONICS CO.,LTD
MQ-9
http://www.hwsensor.com
provides necessary work conditions for work of sensitive components. The enveloped MQ-9 have
6 pins ,4 of them are used to fetch signals, and other 2 are used for providing heating current.
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
Fig.1
Materials
SnO2
Au
Pt
Ni-Cr alloy
Al2O3
Stainless steel gauze
(SUS316 100-mesh)
Copper plating Ni
Bakelite
Copper plating Ni
AПт AПт
Standard circuit:
Heating voltage 5v (High) 60s
As shown in Fig 2, standard measuring circuit of
MQ-9 sensitive components consists of 2 parts. one
VRL
is heating circuit having time control function (the
high voltage and the low voltage work
circularly ). The second is the signal output circuit,
it can accurately respond changes of surface
resistance of the sensor.
Electric parameter measurement circuit is shown as Fig.2
E. Sensitivity characteristic curve
10
Fig.2
Heating voltage 1.4v (Low) 90s
MQ- 9
Vc
RL
LPG
CO
CH4
Ai r
Fig.3 is shows the typical
sensitivity characteristics of
the MQ-9 for several gases.
in their: Temp: 20℃、
Humidity: 65%
O2 concentration 21%
RL=10kΩ
Ro: sensor resistance at 1000ppm
1 LPG in the clean air.
Rs: sensor resistance at various
concentrations of gases.
0.1
100
1000
Fig.3 sensitivity characteristics of the MQ-9
ppm
10000
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090









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MQ-9 Даташит, Описание, Даташиты
HANWEI ELETRONICS CO.,LTD
MQ-9
http://www.hwsensor.com
1. 5
1. 4
1. 3
1. 2
1. 1
1
0. 9
0. 8
0. 7
0. 6
0. 5
- 10 0
MQ- 9
10 20
Fig.4
33%RH
85%RH
30 40
Temp
50
Fig.4 is shows the typical
dependence of the MQ-9 on
temperature and humidity.
Ro: sensor resistance at 1000ppm LPG
in air at 33%RH and 20degree.
Rs: sensor resistance at 1000ppm LPG
at different temperatures and humidities.
OPERATION PRINCIPLE
. The surface resistance of the sensor Rs is obtained through effected voltage signal output of the
load resistance RL which series-wound. The relationship between them is described:
Rs\RL = (Vc-VRL) / VRL
VH5v
In air
In 100ppmCO
In 1000ppm LPG or 5000ppmCH4
In air
1.4v
Signal
60s 90s
Fig.5
Fig. 5 shows alterable situation of RL signal output measured by using Fig. 2 circuit output
signal when the sensor is shifted from clean air to carbon monoxide (CO) or CH4, output signal
measurement is made within one or two complete heating period (2.5 minute from high voltage
to low voltage ).
Sensitive layer of MQ-9 gas sensitive components is made of SnO2 with stability, So, it has
excellent long term stability. Its service life can reach 5 years under using condition.
SENSITVITY ADJUSTMENT
Resistance value of MQ-9 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 200ppm and 5000ppm CH4 or 1000ppm LPG concentration in air and use value of Load
resistance that( 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.
The sensitivity adjusting program:
a. Connect the sensor to the application circuit.
b. Turn on the power, keep time of preheating through electricity is over 48 hours.
c. Adjust the load resistance RL until you get a signal value which is respond to a certain
carbon monoxide concentration at the end point of 90 seconds.
d. Adjust the another load resistance RL until you get a signal value which is respond to a
CH4 or LPG concentration at the end point of 60 seconds .
TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090










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