Insulation
PVC types can be used over the range -30 to +105°C, and are available in twisted, flat pair, or multi-pair configurations. There is a range of options - with ripcord, PVC sheathed, screened, with a copper wire drain, or steel wire armoured constructions - the conductor itself being solid or stranded.

PFA offers a greater temperature range, covering from -273°C to +250°C, or 300°C for short periods. This, too, is available in flat or twisted pair formats, but not steel wire armoured versions.

Moving up the range, we find varnish impregnated glass fibre, which handles from -50°C to +400°C, while unvarnished glass fibre takes this up to 500°C and in some cases 800°C. Single and multi-pair varieties are available in flat and twisted formats with many of the options.


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This information is an extract from TC's outstanding FREE guide to Themocouple and Resistance Thermometry.
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