Cables, Connectors, Compression Fittings and Adaptors

The sensors and instrumentation are the glamourous side of temperature measurement but this is where the accuracy and repeatability comes from.  Having the right cables, connectors and fittings can make the difference between between reliable measurements and burned fingers!

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Cables

Thermocouples require cable conductors specific to the thermocouple type but resistance sensors (platinum and thermistors) only need standard copper conductors.  Different insulation materials allow cables to operate in a wide range of environments...

  • Teflon (PTFE, PFA, FEP) has good chemical and abrasion resistance and can operate from -70 to +260°C.
  • Fibreglass is used in dry, medium/high temperature applications and has a range of 0 to 350°C. A high temperature version can go to 700°C, and a ceramic version up to 1000°C.
  • Silicone rubber, with a temperature range of -60 to +200°C, it is very flexible and water resistant.
  • PVC is a low cost option, water resistant, but with a limited range of only around -10 to +100°C.

Connectors

Used to cables to other cables and to instruments.  Again thermocouples of a given type require specially matched conductors and like cables, thermocouple connectors are available with a range of insulation materials and in both standard and miniature sizes.  Thermocouple cables and connectors are colour coded for ease of matching.

Compression Fittings and Adaptors

Compression fittings are used to connect sensors reliably to the process and come in brass or stainless steel to suit the temperature and environment. Fittings are available in imperial (BSP) or metric thread sizes.