|
|
|
@ -0,0 +1,169 @@
|
|
|
|
|
|
|
|
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 Configuration
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* Good sensitivity to CO/Combustible gas
|
|
|
|
|
|
|
|
* High sensitivity to Methane, Propane and CO
|
|
|
|
|
|
|
|
* Long life and low cost
|
|
|
|
|
|
|
|
* Simple drive circuit
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Application
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* Domestic gas leakage detector
|
|
|
|
|
|
|
|
* Industrial gas detector
|
|
|
|
|
|
|
|
* Portable gas detector
|
|
|
|
|
|
|
|
Technical Data
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Basic test loop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Model No. MQ-9 V VR
|
|
|
|
|
|
|
|
Sensor Type Semiconductor
|
|
|
|
|
|
|
|
Standard Encapsulation RL
|
|
|
|
|
|
|
|
Detection Gas Bakelite VH
|
|
|
|
|
|
|
|
Concentration CO and combustible gas
|
|
|
|
|
|
|
|
GND
|
|
|
|
|
|
|
|
Loop Voltage Vc 10-1000ppm CO
|
|
|
|
|
|
|
|
100-10000ppm combustible gas The above is basic test circuit of the
|
|
|
|
|
|
|
|
Circuit Heater Voltage VH sensor. The sensor need to be put 2
|
|
|
|
|
|
|
|
≤10V DC voltage, heater voltage（VH） and
|
|
|
|
|
|
|
|
Heater Time TL 5.0V±0.2V ACorDC（High） test voltage（VC）. VH used to
|
|
|
|
|
|
|
|
1.5V±0.1V ACorDC（Low） supply certified working temperature
|
|
|
|
|
|
|
|
Load Resistance RL 60±1S（High）90±1S（Low） to the sensor, while VC used to
|
|
|
|
|
|
|
|
detect voltage (VRL) on load
|
|
|
|
|
|
|
|
Heater Resistance RH Adjustable resistance（RL）whom is in series
|
|
|
|
|
|
|
|
31Ω±3Ω（Room Tem.） with sensor. The sensor has light
|
|
|
|
|
|
|
|
Heater PH polarity, Vc need DC power. VC and
|
|
|
|
|
|
|
|
consumption ≤350mW VH could use same power circuit
|
|
|
|
|
|
|
|
with precondition to assure
|
|
|
|
|
|
|
|
Character Sensing Rs 2KΩ-20KΩ(in 100ppm CO ) performance of sensor. In order to
|
|
|
|
|
|
|
|
Resistance make the sensor with better
|
|
|
|
|
|
|
|
Rs(in air)/Rs(100ppm CO)≥5
|
|
|
|
|
|
|
|
Sensitivity S ≤0.6(R300ppm/R100ppm CO)
|
|
|
|
|
|
|
|
20℃±2℃; 65%±5%RH
|
|
|
|
|
|
|
|
Slope α
|
|
|
|
|
|
|
|
Vc:5.0V±0.1V;
|
|
|
|
|
|
|
|
Tem. Humidity VH（High）: 5.0V±0.1V；
|
|
|
|
|
|
|
|
VH（Low）: 1.5V±0.1V
|
|
|
|
|
|
|
|
Condition Standard test circuit
|
|
|
|
|
|
|
|
Over 48 hours
|
|
|
|
|
|
|
|
Preheat time
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
performance, suitable RL value is needed: Email: sales@hwsensor.com
|
|
|
|
|
|
|
|
Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2
|
|
|
|
|
|
|
|
Tel: 86-371-67169070/80 Fax: 86-371-67169090
|
|
|
|
|
|
|
|
Henan Hanwei Electronics Co., Ltd www.hwsensor.com
|
|
|
|
|
|
|
|
Influence of Temperature/Humidity
|
|
|
|
|
|
|
|
Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Sensitivity Characteristics
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Fig.1 shows the typical sensitivity characteristics of Fig.2 shows the typical temperature and humidity
|
|
|
|
|
|
|
|
the MQ-9, ordinate means resistance ratio of the sensor characteristics. Ordinate means resistance ratio
|
|
|
|
|
|
|
|
of the sensor (Rs/Ro), Rs means resistance of sensor
|
|
|
|
|
|
|
|
(Rs/Ro), abscissa is concentration of gases. Rs means in 1000ppm Propane under different tem. and humidity.
|
|
|
|
|
|
|
|
Ro means resistance of the sensor in environment of
|
|
|
|
|
|
|
|
resistance in different gases, Ro means resistance of 1000ppm Propane, 20℃/65%RH
|
|
|
|
|
|
|
|
sensor in 1000ppm LPG. All test are under standard
|
|
|
|
|
|
|
|
test conditions.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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 Email: sales@hwsensor.com
|
|
|
|
|
|
|
|
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, SOX，Cl2，HCl 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 1、3 pins or 4、6 pins, it
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
will make lead broken, and without signal when apply on 2、4 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 temperature：100±20℃
|
|
|
|
|
|
|
|
2.7.4 Welding temperature：250±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 Email: sales@hwsensor.com
|
|
|
|
|
|
|
|
|
miguel
7 years ago