This topic describes the ndir sensor module

User:JXCTUpload time:Mar 20 2023


The NDIR(Non-Dispersive Infrared) sensor module is a specialized electronic device that detects the presence of gases and measures their concentration levels. In recent years, NDIR sensors have gained widespread popularity for their accuracy and reliability in gas detection. In this article, we will discuss what the NDIR sensor module is, how it works, its advantages and disadvantages, and its applications.

ndir sensor module equipment

What is the NDIR Sensor module?

The NDIR sensor module is a device that uses infrared ray to detect gas. It contains an infrared light source, a sample chamber, a detector, and electronics to process the signal. The gas sample passes through the sample chamber, and the infrared ray is absorbed by the gas molecules. The detector measures the amount of light absorbed, which is proportional to the concentration of the gas.

How does the NDIR Sensor module work?

The NDIR sensor module works based on the absorption of infrared radiation by gas molecules. Infrared radiation is a type of electromagnetic radiation with a longer wavelength than visible light. When infrared radiation passes through a gas sample, the gas molecules absorb some specific wavelengths of radiation, depending on the molecular structure of the gas.

The NDIR sensor module uses infrared radiation of a specific wavelength corresponding to the detected gas. For example, carbon dioxide (CO2) absorbs light at a different wavelength than methane (CH4). The detector in the sensor module measures the amount of light absorbed by the gas sample and calculates the gas concentration according to the Beer-Lambert law.

SF6 Module NDIR Infrared

NDIR Sensor module advantages

High accuracy: The NDIR sensor module provides high accuracy in gas detection, making it suitable for critical applications where even small changes in gas concentration can have a significant impact.

Low maintenance: The NDIR sensor module requires minimal maintenance and calibration, making it a low-cost solution for long-term gas monitoring.

Wide application: The NDIR sensor module can detect a variety of gases, including carbon dioxide, methane, and volatile organic compounds (VOCs), making it very useful in a variety of industries, including environmental monitoring, food and beverage production, and automotive manufacturing.

NDIR Sensor module disadvantages

Limited detection range: The NDIR sensor module is designed to detect specific gases and may not be suitable for detecting gases that absorb different wavelengths of infrared radiation.

Slow response time: The response time of the NDIR sensor module is slow, especially when measuring low concentration gases. This can be a major drawback in applications that require real-time gas detection.

NDIR Modules Detect O3 Gas

NDIR Sensor module application

Environmental Monitoring: The NDIR sensor module is commonly used for environmental monitoring applications. Such as measuring atmospheric carbon dioxide levels and monitoring indoor air quality.

Industrial Process Control :NDIR sensor modules are used in various industrial processes to monitor gas concentrations and ensure safe working conditions for employees.

Vehicle emission test: The NDIR gas detector module is used for vehicle emission test to measure the concentration of pollutants in vehicle exhaust.


NDIR Sensor modules are specialized electronic devices that provide high accuracy and reliability in gas detection. They work on the principle of infrared absorption of gas molecules and are widely used in environmental monitoring, industrial process control and vehicle emissions testing