Manual Version: 1.1 Issue Date: 2023-12-26 Zhengzhou Winsen Electronics Technology Co.,

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...

Zhengzhou Winsen Electronics Technology Co., Ltd MPn-4C Flammable Gas Sensor MPn-4C adopts a multi-layer thick film manufacturing process, which integrates a heating electrode, a measuring electrode and a metal oxide semiconductor gas sensitive layer on an Al2O3 ceramic substrate, and encapsulates it in a metal housing. When the detected gas is present in the ambient air, the conductivity of the sensor will change, and the higher the concentration of the gas, the higher the conductivity of the sensor. This change in conductivity can be converted into an output signal corresponding to the gas...

Zhengzhou Winsen Electronics Technology Co., Ltd Basic circuit This circuit shows the basic measuring circuit of sensor. Two voltages should be applied to this sensor: heating voltage (VH) and circuit voltage (Vc). VH is used for supplying a certain temperature which can be DC or AC. VRL is the voltage on the load resistance(RL) which connects to the sensor in series. Vc is supply the test voltage for RL and it must be DC. Gas concentration Fig3.Typical Sensitivity Curve Rs means resistance in target gas with different concentration, R0 means resistance of sensor in 4000ppm CH4 gas. All tests...

Zhengzhou Winsen Electronics Technology Co., Ltd Long-term Stability Aging time (day) NOTE: The output voltage in the figure is the voltage on the load resistance (RL) of the sensor in series, and the horizontal coordinate is the observation time. All the tests were done under standard conditions and measured methane concentrations of 4,000 PPM. Cautions 1 .Following conditions must be prohibited 1.1 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...

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsen-sensor.com 2 .Following conditions should be avoided 2.1 Water Condensation Indoor conditions, slight water condensation will influence sensors’ performance lightly. However, if water condensation on sensors surface and keep a certain period, sensors’ sensitive will be decreased. 2.2 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 characteristic will be affected. 2.3 Long time storage The sensors resistance will drift reversibly if it’s stored...

Zhengzhou Winsen Electronics Technology Co., Ltd Appendix. Information about the load resistance Adjust the load resistance according to the following comparison table Table3 Sensor No. and RL Zhengzhou Winsen Electronics Technology Co., Ltd Add: No.299, Jinsuo Road, National Hi-Tech Zone, Zhengzhou 450001 China Tel: +86-371-67169097 / 67169670 Fax: +86-371-60932988 E-mail: [email protected] Website: www.winsen-sensor.com Email: sales@winsen