Zhengzhou Winsen Electronics Technology Co., Ltd MEMS Smoke Gas Sensor （Model No.：GM-202B） Version: 2.3 Valid from: 2021.01.08 Zhengzhou Winsen Electronics Technology Co., Ltd Statement Tel: 86-371-67169097/67169670 Email: sales@winsensor.

Zhengzhou Winsen Electronics Technology Co., Ltd 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...

Zhengzhou Winsen Electronics Technology Co., Ltd GM-202B MEMS Smoke Gas Sensor Product description MEMS smoke 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 signal. Character...

Zhengzhou Winsen Electronics Technology Co., Ltd Fig2. GM-202B test circuit Instructions: The above fig is the basic test circuit of GM-202B.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.

Zhengzhou Winsen Electronics Technology Co., Ltd Sensor’s Characteristics: temperature Temperature(℃) Fig3.Typical Sensitivity Curve Rs means resistance in target gas with different concentration, R0 means resistance of sensor in clean air. All tests are finished under standard test conditions. Fig4.Typical temperature/humidity characteristics Rs means resistance of sensor in 50ppm propane (C3H8) under different temp. and humidity. Rso means resistance of the sensor in 50ppm propane under 20℃/55%RH. The output in above Fig is the voltage of RL which is in The output in above Fig is the voltage...

Zhengzhou Winsen Electronics Technology Co., Ltd Voltage output(V) Long-term stability: 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. Preheating time(days) Instructions: 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...

Zhengzhou Winsen Electronics Technology Co., Ltd 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 fluorine. 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’s surface, otherwise sensing material will be broken and lost sensitivity. 1.6 Applied voltage Applied voltage on...