Winsen MH-410D NDIR Infrared CO2 Gas Sensor

Statement

This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without written permission, any part of this manual shall not be copied, translated, stored in a database or retrieval system, nor spread through electronic, copying, or record ways.

Thank you for purchasing our product. To help customers use it better and reduce faults caused by misuse, please read the manual carefully and operate correctly according to the instructions. If users disobey the terms or remove, disassemble, or change the components inside the sensor, Winsen shall not be responsible for the loss.

The specifics such as color, appearance, sizes, etc., please refer to the actual product.

Winsen is devoted to product development and technical innovation, reserving the right to improve products without notice. Please confirm the valid version before using this manual. User comments on optimized usage are welcome.

Please keep the manual properly for future reference and assistance with any questions during usage.

Introduction

The MH-410D infrared gas sensor is a miniature universal intelligent sensor that utilizes NDIR (Non-Dispersive Infrared) theory to detect CO2 concentration in the air. It offers good selectivity, stable performance, and a long lifespan, and is independent of Oxygen. An internal temperature sensor can be used for temperature compensation. This miniature infrared gas sensor is developed through the tight integration of mature infrared absorbing gas detection technology, micro machine workout, and superior circuit design.

Features

• High sensitivity, high resolution, low power consumption, fast response time.
• Output method: UART, analog voltage signal.
• Temperature compensation, excellent linear output.
• Long lifespan, excellent stability, anti-poisons, anti-vapor interference.

Applications

• Widely used for HVAC refrigeration.
• Industrial-process control and safety protection.
• Agriculture and animal husbandry.

Main Parameters

Sensor Image (Fig1): A circular sensor unit with the model number MH-410D visible. It features multiple pins for connection.

Measuring Range and Resolution (Fig2)

Structure Size and Pin Definition

Sensor Structure (Picture 1): A technical drawing illustrating the sensor's physical dimensions. It shows a cylindrical body with a diameter of approximately 20mm and a height of 22.6mm. The base has a pin connector arrangement.

Pin Definition (Fig3, Picture 2): The sensor has 5 pins with specific functions:

Output Signals

Analog Voltage Output

The Vout signal is proportional to the gas concentration, with 0.4V representing 0 concentration and 2.0V representing the full detection range. Connection: Vin –5V, GND- Power Ground, Vout-ADC input. If self-checking detects a fault after warm-up, the output voltage is 0V.

Analog Voltage Output Graph: A line graph showing Voltage Output on the Y-axis against Gas Concentration on the X-axis. Key points are marked: 'fault' at 0V, 'zero' at 0.4V, and 'full scale' at 2V.

Digital Output

Please refer to the MH-410D communication protocol for digital output details.

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 II B T4 Gb, making it suitable for Zone 1 and Zone 2, and Class IIA, T1-T3 explosive environments formed by flammable gas or mixtures of steam and air. It has passed inspection by the National Quality Inspection Center for Explosion-proof Electrical Products and obtained the explosion-proof certificate.

When using, please note the following:

• The intrinsically safe power supply must be used to power the sensor; otherwise, the explosion-proof performance will be affected.
• It is forbidden to replace the sensor in dangerous places.
• It is forbidden to disassemble or replace the sensor element to avoid affecting the explosion-proof performance.
• It is not allowed to replace components or structures, so as not to affect the explosion-proof performance.
• The installation and wiring of the safety barrier must be carried out in accordance with the safety barrier instruction manual, and the safety barrier must obtain an explosion-proof certificate.

Connection Diagram of Intrinsically Safe Explosion-Proof System: On-site installation must comply with GB3836.15—2000 "Electrical Equipment for Explosive Gas Environment Part 15: Electrical Installation in Hazardous Locations (Except Coal and Mines)" regulations.

The distribution parameters of the connecting cable between the safety barrier and the sensor should meet the following conditions:

• Cc ≥ Co-Ci
• Lc ≥ Lo-Li
• Ui ≤ Uo
• Ii ≥ Io
• Pi ≤ Po

Note on parameters: Uo: Maximum output voltage of safety barrier; Io: Maximum output current of safety barrier; Po: Maximum output power of safety barrier; Co: Maximum external capacitance of safety barrier; Lo: Maximum external inductance of the safety barrier (refer to the safety barrier instructions for the above parameters).

Notes

• The sensor should be calibrated regularly; the recommended calibration period is 6 months.
• Do not use the sensor for a long time in an environment with high dust density.
• Please use the sensor within its specified power supply range.
• It is forbidden to cut or weld the sensor pins.

Contact Information

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: sales@winsensor.com

Website: www.winsen-sensor.com

Leading gas sensing solutions supplier in China!