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MH-741A Dataheets PDF



Part Number MH-741A
Manufacturers Winsen
Logo Winsen
Description Intelligent Infrared Methane Gas Sensor
Datasheet MH-741A DatasheetMH-741A Datasheet (PDF)

Intelligent Infrared Methane Gas Sensor (Model: MH-741A) Manual Version: 3.3 Valid from: May 1st, 2014 Zhengzhou Winsen Electronics Technology Co., Ltd. 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 keep customers us.

  MH-741A   MH-741A


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Intelligent Infrared Methane Gas Sensor (Model: MH-741A) Manual Version: 3.3 Valid from: May 1st, 2014 Zhengzhou Winsen Electronics Technology Co., Ltd. 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 keep customers using 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 be responsible for the loss. The specific such as color, appearance, sizes etc., please in kind prevail. We are devoting ourselves to products development and technical innovation, so we reserve the right to improve the products without notice. Please confirm it is the valid version before using this manual. At the same time, users’ comments on optimized using way are welcome. Please keep the manual properly, in order to get help if you have questions during the usage in the future. Zhengzhou Winsen Electronics Technology CO., LTD. MH-741A Infrared CH4 Gas Sensor 1. Product Description MH-741A is a universal type intelligent sensor to detect CH4 gas,taking advantage of non-dispersive infrared (NDIR) principle. With high selectivity, no oxygen dependence, high performance and long lifespan features, MH-741A also has built-in temperature compensation feature. MH-741A is a compact and high-performance sensor based on infrared absorption of gas detection technology, micro-machining and sophisticated circuit design. 2. Features  High sensitivity, high resolution, low power consumption  Output method: UART, analog voltage signal, etc.  Quick response  Temperature compensation, excellent linear output  Excellent stability, Long lifespan  Anti-poisons, anti-vapor interference  Detect combustible gas concentration matching with flame-proof marked detector in area 1&2 explosive environments which mix of ⅡA, ⅡB, ⅡC and T1-T6 flammable gases, vapors and air 3. Application Widely used for industrial field instrumentation, industrial-process control and safety protection 4. Specification Table 1 Technical Index Product Model Gas Detected Working Voltage Average Current Interface Level Measurement Range Output Signal Warm-up Time Response Time Working Temperature Working Humidity Dimension Weight MH-741A Flammable Gas 4.5 V ~ 5.5V DC < 100mA 3.3V 0~100%VOL optional (view table 2) IIC 0.4-2V DC 3min T90 < 30s -40℃ ~ 70℃ 0 to 95%RH, non-condensing Φ44×61mm 350g Lifespan >5 years Ex-marking Ex d ⅡC T6 Gb Protected Class IP65 Table 2 Measurement Range and Accuracy Detected Gas Measurement Range Accuracy Methane(CH4) 0~5%VOL 0.01%VOL Methane(CH4) 0~10%VOL 0.01%VOL Methane(CH4) 0~100%VOL 0.1%VOL 5. Structural Drawing Remark Temperature compensation Temperature compensation Temperature compensation Figure 1 Structural Drawing of Sensor Figure 2 Pin Definition Pin Pad1 Pad4 Pad5 Pad2 Pad3 Pad6, Pad7, Pad8 Pad10, Pad11, Pad12 Description V in (input voltage 4.5V~5.5V) GND V out (0.4~2V) IIC(SCL) clock IIC(SDA) data Reserved, do not connect Table 3 Definition of Pin 6. Application Circuit Infrared sensor Display User Isolation Infrared sensor Infrared sensor Micro controller Relay Figure 3 Application Circuit 7. Explanation 7.1 Analogue Voltage Output Input 5V voltage to Win Pin, GND Pin connect power ground and Vout Pin connect input side of ADC, then warm-up the sensor, the Vout side will output a voltage value which stands for the gas concentration, while output voltage range 0.4V~2V stands for gas concentration 0~FS. If it found in trouble in self-inspection process, the output voltage of sensor is 0V. Figure 4 Analogue Voltage Output 7.2 Digital Output Input 5V voltage to Win Pin, GND Pin connect power ground, CLK side of user’s communication interface connect CLK side of detector while SDA side connect SDA side of detector, then the detector will read the value of gas concentration directly through the IIC of the sensor (The pull-up resistor of user’s SCL and SDA signal lines must be no more than 10k to ensure the normal work of the communication interface), no need to calculate. 7.2.1 Communication Protocol MH-741A is communicated through IIC bus. The module works basing IIC slave mode and can connects to external MCU, module address: 0x55, write operation address: 0xAA, read operation address: 0xAB. Every frame number data contains 10 bytes. Different host orders lead to different data and the last byte of data is the proof test value. The SCL clock frequency is recommend less than 10K. 1) Device Address Address format: Highest seven digits are the module add of the sensor(0x55), the least signifi.


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