An online photocatalytic analysis system is not a single instrument but a combination of "reactor + injection valve + gas chromatograph + control program." Its essence is to replace the manual "stop light–take gas–send sample" action with a programmatic, repeatable automatic cycle, letting the photoreaction and detection proceed in sync.
Offline remains a low-cost choice for a single qualitative verification, or when gas products are too trace to detect online. But whenever rate, selectivity, or stability is involved, the data-quality advantage of an online solution is clear.
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Four parts linked together—reactor, injection valve, gas chromatograph, and control program—essentially an automated reaction–detection cycle.
Not necessarily. When products are too trace to detect online, or for a single qualitative test, offline remains a low-cost choice.
It is clearly superior in repeatability and kinetic capture, but accuracy still needs standard-gas calibration as a safeguard.
This article does not constitute a performance commitment; specific technical parameters are subject to the actual product documentation and mutual confirmation.
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