Manual Version: 1.6 Valid from: 2021-07-01 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 MQ-8 Hydrogen Gas Sensor Profile Sensitive material of MQ-8 gas sensor is SnO2, which with lower conductivity in clean air. When hydrogen gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-8 gas sensor has high sensitivity to hydrogen gas, also has anti-interference to other gases. This sensor can detect hydrogen, especially city gas. It is a kind of low-cost sensor for kinds of applications....

Zhengzhou Winsen Electronics Technology Co., Ltd 21%（not less than 18%） O2 concentration effects initial O2 content value, sensitivity and repeatability NOTE: Output voltage (Vs) is VRL in test environment. Basic Circuit Fig2. MQ-8 Test Circuit Instructions: The above fig is the basic test circuit of MQ-8.The sensor requires two voltage inputs: heater voltage (VH) and circuit voltage (VC). VH is used to supply standard working temperature to the sensor and it can adopt DC or AC power. VRL is the voltage of load resistance RL which is in series with sensor. Vc supplies the detect voltage to load...

Zhengzhou Winsen Electronics Technology Co., Ltd The ordinate is resistance ratio of the sensor (Rs/R0), the abscissa The ordinate is resistance ratio of the sensor (Rs/Rso).Rs is concentration of gases. Rs means resistance in target gas with means resistance of sensor in 1000ppm H2 gas under different different concentration, R0 means resistance of sensor in clean air. tem. and humidity. Rso means resistance of the sensor in All tests are finished under standard test conditions. Fig5 shows the VRL in hydrogen with different concentration. Fig5 shows the changing of VRL in the process of putting...

Zhengzhou Winsen Electronics Technology Co., Ltd Cautions 1 .Following conditions must be prohibited 1.1 Exposed to 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, fixature, silicon latex, putty or plastic contain silicon environment. 1.2 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. 1.3 Alkali, Alkali...

Zhengzhou Winsen Electronics Technology Co., Ltd More than six months No less than 168 hours 2.4 Long time exposed to adverse environment No matter the sensors 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. 2.5 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. 2.6 Concussion If sensors meet strong concussion, it may...