Winsen MP905 Air Quality Gas Sensor User Manual
- June 13, 2024
- Winsen
Table of Contents
Winsen MP905 Air Quality Gas Sensor
Product Information
The Air-Quality Gas Sensor (Model: MP905) is a high-quality gas sensor manufactured by Zhengzhou Winsen Electronics Technology Co.,Ltd. It is designed to detect harmful gases such as benzene,toluene, formaldehyde, alcohol, smoke, lighter gas, and paints. The sensor features high sensitivity, quick response and resume time, low power consumption, simple detection circuit, good stability, and long life. It is suitable for use in household and office environments for gas detection, automatic exhaust devices, air cleaners, and more.
Product Usage Instructions
- The MP905 Gas Sensor requires a basic test circuit for operation. Refer to Fig2 for the circuit diagram.
- The sensor requires a heater voltage (VH) and circuit voltage (VC) which share one source. Both voltages must be DC power.
- VRL is the voltage of the load resistance RL, which should be connected in series with the sensor.
- To measure the concentration of different gases, refer to Fig3 for the typical sensitivity curve. The resistance of the sensor in the target gas (Rs) is compared to the resistance in clean air (Rs0).
- Fig4 shows the typical temperature and humidity characteristics of the sensor. The resistance of the sensor in 10ppm alcohol (Rs) is compared to the resistance in air under 20/55%RH (Rso).
- Fig6 displays the linearity curve for different gas concentrations.
- For long-term stability, refer to Fig7. Aging time is represented on the abscissa, and VRL (output voltage) is represented on the ordinate.
- Caution should be exercised to avoid exposing the sensor to volatilizable organic silicon steam or high corrosive gas, as it may damage the sensor’s sensitivity.
Statement
This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without the written permission, any part of this manual shall not be copied, translated, stored in database or retrieval system, also can’t spread through electronic, copying, record ways.
Thanks for purchasing our product. In order to let customers use it better and reduce the faults caused by misuse, please read the manual carefully and operate it correctly in accordance with the instructions. If users disobey the terms or remove, disassemble, change the components inside of the sensor, we shall not be responsible for the loss. The specific such as color, appearance, sizes &etc, please in kind prevail. We are devoting ourselves to products development and technical innovation, so we reserve the right to improve the products without notice. Please confirm it is the valid version before using this manual. At the same time, users’ comments on optimized using way are welcome.Please keep the manual properly, in order to get help if you have questions during the usage in the future.
Zhengzhou Winsen Electronics Technology CO., LTD
Profile
MP905 gas sensor is for air quality. It adopts multilayer thick film manufacturing technology. The heater and metal oxide semiconductor material on the ceramic substrate of subminiature Al203 are fetched out by electrode down- lead, encapsulated in metal socket and cap. Conductivity of the sensor is affected by the concentration of target gas. The higher the concentration is, the higher conductivity of sensor gets. Users can adopt simple circuit to convert variation of conductivity into output signal corresponding to gas concentration.
Features
- High sensitivity to benzene, toluene, formaldehyde, alcohol, smoke,lighter gas, paints; quick response and resume; low power consumption, simple detection circuit, good stability and long life.
Main Application
- It is used in occasions such as households and office for harmful gas detection, automatic exhaust device, air cleaner&etc.
Technical Parameters
Stable 1
| Model | MP905 |
|---|---|
| Sensor Type | Semiconductor flat surfaced sensor |
| Standard Encapsulation | Metal Cap |
Detection Gas
| benzene, toluene, formaldehyde, alcohol,smoke, lighter gas,paints
etc.
Detection range| 0.5～1000ppm(alcohol)
Standard circuit
| ****
Loop voltage
| VC /
VH
| 5.0V±0.1V DC
Load resistance| RL| Adjustable
sensor features in standard test condition
| Heating resistance| RH| 95Ω±10Ω(Room Tem.)
Heating consumption| PH| ≤300mW
Surface resistance| RS| 1KΩ～15KΩ(in 10ppm alcohol)
Sensitivity| S| Rs(in air)/Rs(in 10ppm alcohol）≥2
Concentration slope| α| ≤0.6(R 50ppm/R 10ppm alcohol)
Standard
condition of test
| Temperature, humidity| 20℃±2℃；65%±5%RH
Standard test circuit| VC/VH :5.0V±0.1V
Warm-up time| More than 48 hours
Basic Circuit
Instructions
The above fig is the basic test circuit of M P905. The sensor requires heater voltage V H and circuit voltage V C ) which share one source . They must adopt DC power. V RL is the voltage of load resistance R L which is in series with sensor.
Description of Sensor Characters
- Rs means resistance in target gas with different concentrations, Rs0 means resistance of sensor in clean air All test s are finished under standard test conditions.
- Rs means resistance of sensor in 10ppm alcohol under different temperature. and humidity. Rso means resistance of the sensor in air under 20 55%RH.
Output Voltage (V)
NOTE: Test is finished in standard test conditions, the abscissa is observing time and the ordinate is VRL.
Precautions
Cautions
- The following conditions must be prohibited
- Exposed to volatilizable organic silicon steam: Sensing material will lose sensitivity and never recover if the sensor absorbs organic silicon steam. Sensors must avoid exposing to silicon bond, fixture, silicon latex, putty or plastic contain silicon environment.
- High Corrosive gas: If the sensors are exposed to high concentration corrosive gas (such as H2S, SOX, Cl2, HCl etc.), it will not only result in corrosion of sensors structure, also it cause sincere sensitivity attenuation.
- 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 fluorine.
- Touch water: Sensitivity of the sensors will be reduced when spattered or dipped in water.
- Freezing: Do avoid icing on sensor’s surface, otherwise sensing material will be broken and lost sensitivity.
- Applied higher voltage: Applied voltage on sensor should not be higher than stipulated value, even if the sensor is not physically damaged or broken, it causes down-line or heater damaged, and bring on sensors’ sensitivity characteristics changed badly.
- Voltage on wrong pins: As Fig8,Pin 1 connects to heater(or test) power supply, Pin 2 connects to load resistance, Pin 3 connects ground.;
- The following conditions should be avoided
- Water Condensation: Indoor conditions, slight water condensation will influence sensors’ performance lightly. However, if water condensation on sensors surface and keep a certain period, the sensor s ’ sensitivwill be decreased.
- Used in high gas concentration: No matter the sensor is electrified or not, if it is placed in high gas concentration for long time , sensors characteristics will be affected. If lighter gas spray s the sensor, it will cau se extreme damage.
- Long time storage: The sensor’s resistance will drift reversibly if it’s stored for long time without electrify, this drift is related with storage conditions. Sensors sho uld be stored in airproof bag without volatile silicon compounds. For the sensors with long time storage but no electrify, they need long galvanical aging time for st a bility before using.
The suggested aging time as follow: Storage Time| Suggested aging time
---|---
Less than one month| No less than 48 hours
1 ~ 6 months| No less than 72 hours
More than six months| No less than 168 hours - Long time exposed to adverse environment: No matter the sensors are electrified or not, if exposed to adverse environment for long time, such as high humidity, high temperature, or high pollution etc .., it will influence the sensors’ performance badly.
- Vibration: Continual vibration will result in sensors down lead response then break . In transportation or assembling line, a pneumatic screwdriver/ultrasonic welding machine can lead this vibration.
- Concussion: If sensors meet strong concussion, it may lead its lead wire to disconnected.
- Usage Conditions: For sensor, handmade welding is optimal way. The welding conditions as follow
* **Soldering flux:** Rosin soldering flux contains least chlorine
* homo-thermal soldering iron
* **Temperature:** 3 50
* **Time:** less than 3 secondsIf disobey the above using terms, sensors sensitivity will reduce.
Contact
- Tel: 86-371-67169097/67169670
- Fax: 86-371-60932988
- Email: sales@winsensor.com
Leading gas sensing solutions supplier in China!
References
- Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics
- Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics
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