Thermocouples
High accuracy Type T Thermocouple wire.
As an integral part of any high accuracy thermocouple temperature measuring system, the wire is subject to severe conditions and quite often rough handling from operatives. Repeated bending, or cold working of a thermocouple can generate stress and distortion of the crystalline structure of the wire, resulting in significant potential for measurement error. Withnell sensors thermocouple wire is multi stranded, made of the highest purity and uniformity available, to minimise measurement error from cold working and material inconsistencies.
3 and 7 Strand Type T Thermocouple wire.
Withnell Sensors wire is available in 3 and 7 strand configurations, individually insulated with an overall clear Teflon insulation. The three stand wire is used where space is at a premium or where the wire must be fed through narrow openings like down plastic tubing or in a small filter housing. The three strand wire has a major OD of 1.88mm and can be used in most processes from Liquid Nitrogen (-196ºC) up to a continuous temperature of 200ºC. The seven strand wire has an OD of 3.05mm and is used where extra strength is needed.
7 Strand Type T Kapton Thermocouple wire.
Seven strand Kapton insulated wire is used for dry heat ovens and Tunnels, and is rated up to 350 ºC, this wire must only be used in for dry heat applications as any moisture or oil can damage the insulation properties.
Teflon Tips extend thermocouple Life.
Encapsulating the thermocouple tip with dual shrink Teflon tubing will extend the life of your sensor. A sealed tip minimises the risk of moisture being pulled along the wire (known as condensate tracking), minimising oxidation of the thermocouple and extending the life. In addition the Teflon tip prevents potential errors due to grounding should a bare tip touch a conductive surface of inadequately grounded plant and equipment. Properly sealed hot junctions minimise the risk of air entering the chamber via the thermocouple during the autoclave air removal stage.