Discussion
Why is the sample line to a total hydrocarbon analyser heated?
Answer: C
Higher hydrocarbons condense readily, and anything that condenses in the line is not measured, so the reading is low and drifts as the deposit builds and re-evaporates. Lines are typically held at 180 degrees for engine and stack work. The flame does not need help to stay alight, the detector chemistry is fast at any line temperature, and the water problem is real but secondary. The general rule is that a sample must reach the analyser unchanged or the best instrument in the world will report the wrong number.
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