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Infrared Non Dispersive CO2 Analyzer Working Principle

The CO2 Analyser is a Analytical instrument that measures the concentration of CO2 gas in the process. The CO2 Analyzer use multi-component analysis by using Non Dispersive Infrared (NDIR) sensor technology for consistent, precise process gas measurement.

CO2 Analyzer Working Principle

The Non Dispersive Infrared (NDIR) detection method is based upon the absorption of infrared radiation at specific wavelengths as it passes through a volume of sample. Non-Dispersive Infrared (NDIR) techniques for the measurement of various gases rely on the energy absorption characteristics of a particular gas in the infrared region. In a simple NDIR instrument, Infrared energy passes through two identical tubes and falls on a detector. The first tube is the reference cell and is filled with a non-absorbing gas such as nitrogen. The second tube is the measurement cell and contains the gas sample to be analyzed.

CO2 Analzer Working Principle

The IR Source continuously sends an IR waves through the gas tubes and detector measures the intensity of two different wavelengths, one at the sample gas absorption wavelength and the other is at reference gas absorption wavelength. As the reference gas generally contains nitrogen so the detector receives 100% signal. If the CO2 gas is present in sample gas means the received signal will be attenuated at the detector side. The detector measures these two signals and their difference is proportional to the amount of absorbing gas in the sample cell .i.e. CO2 gas. So Finally the CO2 gas concentration is measured with the difference in absorption of IR radiation in the sample and reference cells. CO2 gas concentration measuring unit is ppm.

Also See: NDIR Gas Analyzer Animation 

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Shaju August 13, 2015 at 7:11 am

Infrared Non Dispersive ,(NDIR), CO2 gas analyzer working principle is elaborate and informative. Thank you very much.

S Bharadwaj Reddy August 13, 2015 at 7:19 am

Hi Shaju,

Thanks for the encouraging comments. More will be updated soon. Keep in touch.

Arsi January 15, 2016 at 5:08 pm

Dear sir, i like it for analyzer. Please post all analyzer instruments information.
thank you

Jlliot October 8, 2015 at 10:57 pm

So many interesting posts i read here on instrumentation, Thank You.

akash khobragade May 19, 2016 at 8:39 pm

This is best in easy way information given by you sir thank you…

Imteyez May 30, 2016 at 6:43 pm

Very good

Sandeep July 11, 2016 at 5:17 pm

it is really very informative, but i want to know more about detector and the chopper used in this type of analyzer.like i read that at detector resonance is created, why? and why is this chopper used in analyzer?

S Bharadwaj Reddy July 12, 2016 at 4:02 am

Hello Sandeep, Chopper is used to split the source for reference cell and sample cell as shown in above figure. Concept is same.

sandeep July 12, 2016 at 5:57 am

Hiii S bharadwaj
Actually the source is split before chopper as u can see it in the image “Typical infrared Photometer” and in second image also. In this Image chopper is after splitter.

Rakesh Duvey July 13, 2016 at 2:03 pm

Sir pls give me a brief knowledge of stacker Reclaimer and wagon trippler


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