For CO2 gas concentration detection, using the infrared principle, should a detector or an analyzer be used?
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There is disagreement regarding the measurement of the CO2 concentration at 16% VOL in atmospheric-pressure mixed air for a particular project: one approach involves using an imported detector (range: 0–30% VOL), while the other approach uses an infrared analyzer (range: 0–50% VOL)； Considering cost, reliability, and the actual performance of the two types of instruments, I would like to hear the suggestions from experts. :handshake
Choose the one that is cheaper in percentage terms
The precision of infrared methods is not as good as that of chemical methods
Infrared is often used in high-temperature environments
Infrared is more convenient; it can be calibrated using a standard gas. For imported ones, it depends on what the detection principle of the TCD is
This post was last edited by qugd on 10/8/2019 at 11:40. Regarding component analysis, what is the essential difference between analyzers and detectors? Also, what is TCD that you mentioned? Is it some component used in infrared gas analyzers? From the use of the abbreviation TCD, it seems you’re no ordinary layperson when it comes to infrared gas analyzers. First, consider the specific requirements; second, check whether the performance and specifications meet those requirements; third, compare the cost-performance ratio; and finally, assess the manufacturer’s service and support capabilities. If someone only does sales pitching without any technical expertise, such a salesperson should be dismissed.
I’m not a salesperson; I’m just a colleague in the field of gas detection who happened to comment. I’m not sure where you got your conclusions from. For detecting CO2 in the air, the principle commonly used in chromatography is that of a thermal conductivity detector, and infrared detectors (non-dispersive infrared) have a detection range that matches what the original poster mentioned. What I mean is the same as what you wrote: understand the principle of the device first, and then consider his own needs!
Do you mean a chromatographic analyzer by import detector? For CO2 detection, an infrared analyzer is recommended; the TCD mentioned above refers to a thermal conductivity detector.