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-9B Semiconductor Sensor for Carbon Monoxide Profile Sensitive material of MQ-9B gas sensor is SnO2, which with lower conductivity in clean air. It detects carbon monoxide (1.5V) by method of cycle high and low temperature. At high temperature (5.0V), it can detect CO as well as clean the other gases adsorbed at low temperature. The sensor’s conductivity gets higher along with the CO and CH4 gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. It has...

Zhengzhou Winsen Electronics Technology Co., Ltd Basic Circuit VH AC or DC High voltage and low voltage can switch Fig2. MQ-9B Test Circuit Instructions: The above fig is the basic test circuit of MQ-9B.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. For this model sensor, VH should be at 1.5V±0.1V low voltage when detect CO while should be at 5V±0.1V at non detection status(resuming period) and CH4 detection period. VRL is the voltage of load resistance RL which...

Zhengzhou Winsen Electronics Technology Co., Ltd Fig5 shows the VRL in CO gas with different concentration. Fig6 shows the changing of VRL in the process of putting The resistance load RL is 4.7 KΩ and the test is finished in the sensor into target gas and removing it out. standard test conditions. Time(day) Fig7.long-term Stability Test is finished in standard test conditions, the abscissa is observing time and the ordinate is VRL. 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...

Zhengzhou Winsen Electronics Technology Co., Ltd 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 higher voltage Applied voltage on sensor should not be higher than stipulated value, even if the sensor is not physically damaged or broken, it causes down-line or heater damaged, and bring on sensors’ sensitivity characteristic changed badly. 1.7 Voltage on wrong pins...

Zhengzhou Winsen Electronics Technology Co., Ltd homothermal soldering iron Temperature： ≤350℃ Time：less than 3 seconds If disobey the above using terms, sensors sensitivity will reduce. 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@wi