Discussion
Why is a flow indicator fitted to almost every analyser sample line?
Answer: A
A stable reading tells you nothing about whether the gas is fresh, so a simple rotameter showing flow is the quickest confirmation that the sample is arriving and that no blockage has developed. It is the first thing an experienced technician looks at. Volume is not needed for a concentration measurement, regulation is done by a pressure controller, and calibration is triggered by a timer. The cheapest component in the system is often the most diagnostic.
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