Manual Version: 1.0 Valid from: 2021-09-17 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 MP-4C Flammable Gas Sensor MP-4 model with advanced planar construction is comprised of heater and metal oxide semiconductor material of subminiature Al2O3 ceramic plate, fetch out electrode down-lead, encapsulation in metal base and cap. When the target gas exists, the sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, convert change of conductivity to correspond output signal of gas concentration. The product is suitable for the common gases such as Alcohol, Acetic acid and so on have...

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. Fig3.Typical Sensitivity Curve The ordinate is resistance ratio of the sensor (Rs/R0), the abscissa is concentration of gases. Rs means resistance in target gas, R0 means resistance...

Zhengzhou Winsen Electronics Technology Co., Ltd Long-term Stability NOTE: All the test is finished in standard test conditions, methane concentration is 5,000ppm. the abscissa is observing time and the ordinate is VRL. 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 sensitivity attenuation. 1.2 Alkali, Alkali metals salt, halogen pollution The sensors performance will be changed badly if sensors...

Zhengzhou Winsen Electronics Technology Co., Ltd Pin 1&2 is heating electrode, Pin 3&4 is measuring electrode. Fig8.Pin Schematic Diagram 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...

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsen-sensor.com For sensor, handmade welding is optimal way. The welding conditions as follow:     Soldering flux: Rosin soldering flux contains least chlorine homothermal soldering iron Temperature： ≤350℃ Time：less than 3 seconds If disobey the above using terms, sensors sensitivity will be reduced. 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:...