Abstract
Melt temperature is probably the single most important measurement made in polymer synthesis and processing operations. But accuracy in melt temperature measurement is very difficult to achieve because of conduction errors -- heat losses from sensing probes immersed in melts by conduction of heat along the relatively short, large diameter metal probes normally used to their mounting fixtures. Conduction errors as great as 20°C or more are frequently observed in polymer plants. A second type of error that is sometimes significant is heating of probes by generation of heat by friction in films of polymer flowing past them.The problem is explained mathematically and a rule of thumb (Length/Diameter ≧ 11cm0.5) presented which can be used to test whether error is likely to occur in real situations. A number of temperature probe designs which have proved useful in measuring melt temperature accurately in polymer synthesis and processing plants are described.
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