NDIR Infrared CO2 Gas Sensor （Model：MH-411D） Manual Version: 1.1 Valid from: 2022.12.01 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 MH-411D NDIR Infrared CO2 Sensor Introduction MH-411D infrared gas sensor is a miniature universal intelligent sensor, which adopts NDIR theory to detect concentration of CO2 in air and has good selectivity, stable performance, long life, also is independent of Oxygen. The inside temperature sensor could be used for temperature compensation. This miniature infrared gas sensor is developed by the tight integration of mature infrared absorbing gas detection technology, micro machine workout and superior circuit design. High sensitivity, high resolution,...

Zhengzhou Winsen Electronics Technology Co., Ltd Table2.Measuring Range and Resolution Target Gas Measuring Range Analog output 0~2000 ppm 0~6000 ppm Measuring Range Digital output 400ppm~full scale Default Note Temperature compensation Structure Size （Unmarked size tolerance is ±0.2） Pin definition table3.Pin definition Name of Pin UART（RXD） 0～3.0 V data input UART（TXD） 0～3.0 V data output Analog voltage output The output of Vout is proportional to the gas concentration, 0.4-2.0V output stands for 0 to full range. Connection: Vin –5V,GND- Power Ground, Vout-ADC input. After warm-up, If self-checking...

Zhengzhou Winsen Electronics Technology Co., Ltd Digital Output Please referMH-411D communication protocol. Intrinsically safe explosion-proof This product meets the standards of GB3836.1-2010 "Explosive Atmosphere Part 1: General Requirements for Equipment" and GB3836.4-2010 "Explosive Atmosphere Part 4: Equipment Protected by Intrinsically Safe "i"" standards”; the explosion-proof mark is Exib ⅡB T4 Gb, it is suitable for zone 1 and zone 2, contains Class IIA, T1-T3 explosive environment formed by the flammable gas, mixture of steam and air; it has passed the inspection by the National Quality...

Zhengzhou Winsen Electronics Technology Co., Ltd Po: Maximum output power of safety barrier Co: Maximum external capacitance of safety barrier Lo: the maximum external inductance of the safety barrier (see the safety barrier instructions for the above parameters book) Cc: Maximum allowable distributed capacitance of connecting cable Ui: sensor maximum input voltage Ii: Maximum sensor input current Pi: sensor maximum input power Ci: Maximum internal capacitance of the sensor Li: Maximum internal inductance of the sensor Lc: Maximum allowable distributed inductance of connecting cable. Note: ...