Zhengzhou Winsen Electronics Technology Co., Ltd MEMS Combustible Gas Sensor （Model No.：GM-402B） Version: 2.2 Valid from: 2020-08-25 Zhengzhou Winsen Electronics Technology Co., Ltd Email: sales@winsensor.

Zhengzhou Winsen Electronics Technology Co., Ltd 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...

Zhengzhou Winsen Electronics Technology Co., Ltd GM-402B MEMS Combustible Gas Sensor Product description MEMS combustible gas sensor is using MEMS micro-fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. The higher the concentration of the gas, the higher the conductivity. Use simple circuit can convert the change of conductivity of the gas concentration corresponding to the output...

Zhengzhou Winsen Electronics Technology Co., Ltd Standard test Temp. Humidity Standard test circuit Sensor Structure Diagram Outline drawing Bottom Apparent size （Unit：mm）

Zhengzhou Winsen Electronics Technology Co., Ltd Fig2. GM-402B test circuit Instructions: The above fig is the basic test circuit of GM-402B.The sensor requires two voltage inputs: heater voltage (VH) and circuit voltage (VC). VH is used to supply specific working temperature to the sensor and it can adopt DC or AC power. Vout is the voltage of load resistance RL which is in series with sensor. Vc supplies the detect voltage to load resistance RL and it should adopt DC power. Sensor’s Characteristics: Rs means resistance in target gas with different Rs means resistance of sensor in 5000ppm methane...

Zhengzhou Winsen Electronics Technology Co., Ltd The output in above Fig is the voltage of RL which is in The output in above Fig is the voltage of RL which is in series series with sensor. All tests are finished under standard with sensor. All tests are finished under standard test test conditions and the test gas is 5000ppm CH4. Long-term stability: Voltage output(V) Preheating time(days) Fig7.long-term Stability Test is finished in standard test conditions, the abscissa is observing time and the ordinate is voltage output of RL. Email: [email protected]

Zhengzhou Winsen Electronics Technology Co., Ltd 1. Preheating time Sensor’s resistance may drift reversibly after long-term storage without power. It need to preheat the sensor to reach inside chemical equilibrium. Preheating voltage is same with heating voltage VH. The suggested preheating time as follow: Storage Time Suggested aging time Less than one month No less than 48 hours No less than 72 hours More than six months No less than 168 hours 2. Calibration Sensor’s accuracy is effected by many factors such as reference resistance’s difference, the sensitivity difference, temperature, humidity,...

Zhengzhou Winsen Electronics Technology Co., Ltd 2.4 Vibration Continual vibration will result in sensors down-lead response then break. In transportation or assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration. 2.5 Concussion If sensors meet strong concussion, it may lead its lead wire disconnected. 2.6 Soldering 2.6.1Recommended conditions for reflow soldering neutral atmosphere soldering temperature 250±10℃ avoid flux steam 2.6.2Recommended conditions for manually soldering rosin flux with least chlorine soldering temperature ≤350℃ lasting time ≤5s. If...