Infrared CO2 Sensor Module (Model: MH-Z19D) User’s Manual (Version 1.3) Issue Date. 2021.10.11 Zhengzhou Winsen Electronics Technology Co., Ltd ISO9001 Certificated Company Leading gas sensing solutions supplier in China

Statement This manual’s 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...

MH-Z19D NDIR CO2 Module Profile MH-Z19D NDIR infrared gas module is a common type, small size sensor, pins type or terminal type, using non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependent and long life. Built-in temperature compensation; and it has UART output and PWM output. It is developed by the tight integration of mature infrared absorbing gas detection technology, precision optical circuit design and superior circuit design. Applications *Smart home *Indoor air quality monitoring *Air cleaner device *Ventilation...

Detection range and accuracy Table2. Detection Gas Carbon Dioxide Dimensions (Pins type) Pins connection type table3. Pin Vin GND PWM Hd Rx Tx Pin Definition Positive pole of power (Vin) Negative pole of power (GND) PWM HD(zero point calibration, low level lasting for over 7s is effective) UART(RXD)TTL Level data input UART(TXD)TTL Level data output Leading gas sensing solutions supplier in China

Dimensions (Terminal type) Terminal connection type Pin Pin 4 Pin 3 Pin 2 Pin 7 Terminal Pin Definition Vin Power In GND Reserved PWM HD(zero point calibration, low level lasting for over 7s is effective) UART(RXD)TTL Level data input UART(TXD)TTL Level data output Terminal Connection Version Please avoid the pressure of its optical chamber from any direction, during welding, installation, and use. When placed in small space, the space should be well ventilated, especially for diffusion window. The module should be away from heat, and avoid direct sunlight or other heat radiation. The module...

To ensure the normal work, the power supply must be among 5.0V±0.1V DC rang, the power current must be not less than 150mA. Out of this range, it will result in the failure of the sensor. (The concentration output is low, or the sensor cannot work normally.) During the zero-point calibration procedure by manual or sending command, the sensor must work in stable gas environment (400ppm) for over 20 minutes. Forbid using wave soldering for the sensor. When soldering with soldering iron, set the temperature to be (350±5)℃, and soldering time must be within 3 seconds. We suggest customers to use...