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MQ-9 PDF даташит

Спецификация MQ-9 изготовлена ​​​​«Henan Hanwei Electronics» и имеет функцию, называемую «Semiconductor Sensor».

Детали детали

Номер произв MQ-9
Описание Semiconductor Sensor
Производители Henan Hanwei Electronics
логотип Henan Hanwei Electronics логотип 

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MQ-9 Даташит, Описание, Даташиты
Henan Hanwei Electronics Co., Ltd
www.hwsensor.com
MQ-9 Semiconductor Sensor for CO/Combustible Gas
Sensitive material of MQ-9 gas sensor is SnO2, which with lower conductivity in clean air. It make
detection by method of cycle high and low temperature, and detect CO when low temperature (heated
by 1.5V). The sensor’s conductivity is more higher along with the gas concentration rising. When high
temperature (heated by 5.0V), it detects Methane, Propane etc combustible gas and cleans the other
gases adsorbed under low temperature. Please use simple electrocircuit, Convert change of conductivity
to correspond output signal of gas concentration.
MQ-9 gas sensor has high sensitity to Carbon Monoxide, Methane and LPG. The sensor could be
used to detect different gases contains CO and combustible gases, it is with low cost and suitable for
different application.
Character
* Good sensitivity to CO/Combustible gas
* High sensitivity to Methane, Propane and CO
* Long life and low cost
* Simple drive circuit
Configuration
Application
* Domestic gas leakage detector
* Industrial gas detector
* Portable gas detector
Technical Data
Basic test loop
Model No.
Sensor Type
Standard Encapsulation
Detection Gas
Concentration
Loop Voltage Vc
Circuit
Heater Voltage VH
Heater Time
TL
Load Resistance RL
Heater Resistance
Character
Heater
consumption
Sensing
Resistance
Sensitivity
RH
PH
Rs
S
Slope
α
Tem. Humidity
Condition
Standard test circuit
Preheat time
MQ-9
Semiconductor
Bakelite
CO and combustible gas
10-1000ppm CO
100-10000ppm combustible gas
10V DC
5.0V±0.2V ACorDCHigh
1.5V±0.1V ACorDCLow
60±1SHigh90±1SLow
Adjustable
31±3Room Tem.
350mW
2K-20K(in 100ppm CO )
Rs(in air)/Rs(100ppm CO)5
0.6(R300ppm/R100ppm CO)
20±2; 65%±5%RH
Vc:5.0V±0.1V;
VHHigh: 5.0V±0.1V
VHLow: 1.5V±0.1V
Over 48 hours
performance, suitable RL value is needed:
Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2
Tel: 86-371-67169070/80
Fax: 86-371-67169090
V VR
RL
VH
GND
The above is basic test circuit of the
sensor. The sensor need to be put 2
voltage, heater voltageVHand
test voltageVC. VH used to
supply certified working temperature
to the sensor, while VC used to
detect voltage (VRL) on load
resistanceRLwhom is in series
with sensor. The sensor has light
polarity, Vc need DC power. VC and
VH could use same power circuit
with precondition to assure
performance of sensor. In order to
make the sensor with better









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MQ-9 Даташит, Описание, Даташиты
Henan Hanwei Electronics Co., Ltd
Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL
Sensitivity Characteristics
www.hwsensor.com
Influence of Temperature/Humidity
Fig.1 shows the typical sensitivity characteristics of
the MQ-9, ordinate means resistance ratio of the sensor
(Rs/Ro), abscissa is concentration of gases. Rs means
resistance in different gases, Ro means resistance of
sensor in 1000ppm LPG. All test are under standard
test conditions.
Fig.2 shows the typical temperature and humidity
characteristics. Ordinate means resistance ratio
of the sensor (Rs/Ro), Rs means resistance of sensor
in 1000ppm Propane under different tem. and humidity.
Ro means resistance of the sensor in environment of
1000ppm Propane, 20/65%RH
Structure and configuration
Structure and configuration of MQ-9 gas sensor is shown as Fig. 3, 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 components. The enveloped MQ-7 have 6 pin, 4
of them are used to fetch signals, and other 2 are used for providing heating current.
Tel: 86-371-67169070/80
Fax: 86-371-67169090









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MQ-9 Даташит, Описание, Даташиты
Henan Hanwei Electronics Co., Ltd
www.hwsensor.com
Notification
1 Following conditions must be prohibited
1.1 Exposed to organic silicon steam
Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond,
fixature, silicon latex, putty or plastic contain silicon environment
1.2 High Corrosive gas
If the sensors exposed to high concentration corrosive gas (such as H2Sz, SOXCl2HCl etc), it will
not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation.
1.3 Alkali, Alkali metals salt, halogen pollution
The sensors performance will be changed badly if sensors be sprayed polluted by alkali metals salt
especially brine, or be exposed to halogen such as fluorin.
1.4 Touch water
Sensitivity of the sensors will be reduced when spattered or dipped in water.
1.5 Freezing
Do avoid icing on sensor’surface, otherwise sensor would lose sensitivity.
1.6 Applied voltage higher
Applied voltage on sensor should not be higher than stipulated value, otherwise it cause down-line or
heater damaged, and bring on sensors’ sensitivity characteristic changed badly.
1.7 Voltage on wrong pins
For 6 pins sensor, if apply voltage on 13 pins or 46 pins, it
will make lead broken, and without signal when apply on 24 pins
2 Following conditions must be avoided
2.1 Water Condensation
Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water
condensation on sensors surface and keep a certain period, sensor’ sensitivity will be decreased.
2.2 Used in high gas concentration
No matter the sensor is electrified or not, if long time placed in high gas concentration, if will affect
sensors characteristic.
2.3 Long time storage
The sensors resistance produce reversible drift if it’s stored for long time without electrify, this drift is
related with storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air.
For the sensors with long time storage but no electrify, they need long aging time for stbility before using.
2.4 Long time exposed to adverse environment
No matter the sensors electrified or not, if exposed to adverse environment for long time, such as
high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly.
2.5 Vibration
Continual vibration will result in sensors down-lead response then repture. In transportation or
assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration.
2.6 Concussion
If sensors meet strong concussion, it may lead its lead wire disconnected.
2.7 Usage
For sensor, handmade welding is optimal way. If use wave crest welding should meet the following
conditions:
2.7.1 Soldering flux: Rosin soldering flux contains least chlorine
2.7.2 Speed: 1-2 Meter/ Minute
2.7.3 Warm-up temperature100±20
2.7.4 Welding temperature250±10
2.7.5 1 time pass wave crest welding machine
If disobey the above using terms, sensors sensitivity will be reduced.
Tel: 86-371-67169070/80
Fax: 86-371-67169090










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