Ndir sensor Introduction to Principles and Techniques

The NDIR sensor is a new and relatively simple gas sensors. In the sensor, the infrared radiation emitted by the light source passes through the measurement unit first, and there is a detection gas to be analyzed in the measurement unit. The main components of the sensor are infrared light source, measuring unit (or optical channel), infrared photodetector and optical filter.

Infrared radiation will be emitted from the light source first, and then pass through the measurement unit (or optical channel). And the gas to be analyzed is in the direction of the photodetector. The gas in the measurement unit will determine the absorption of infrared radiation at a specific wavelength according to Beer-Lambert's law. And use the change of incident radiation on the photodetector . To calculate the concentration of the gas in the measurement unit. The photodetector will be equipped with an optical filter that can suppress radiation to all wavelengths. In addition to the wavelengths absorbed by the gas. To be analyzed in the sensor, it will also allow a highly selective sensor to measure the gas.

In theory, as long as the gas is composed of two or more different atoms in molecules. It can absorb infrared radiation with a characteristic wavelength in order to use NDIR technology to detect the gas.

NDIR nitrogen dioxide sensor: measuring range 0-10000ppm. Measuring resolution up to 1ppm, accuracy ±5% F.S, response time less than 30 seconds.

Ndir sulfur hexafluoride sensor

Ndir sulfur hexafluoride detector: the measurement range has multiple ranges of 0-1000/0-3000/0-5000/0-10000ppm. The measurement accuracy is ±2%FS, the response time is less than 30 seconds. The working voltage is 9-24V DC, average Power consumption is less than 60mA.

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