DATA SHEET No. 002 ValidationThermocouple
Wire
Product code : VTFP
The preferred method of
temperature measurement for pharmaceutical validation purposes isthe copper/Constantan thermocouple, more commonly known as the type ‘T’ thermocouple.This thermocouple was developed for use within the range of –40 to +350°C and generates ahigher mV output per °C than other
industrial thermocouples in this temperature range. The tolerance v alue for this thermocouple is also considerably better than that of other thermocouple types. A lthough users frequently cut the thermocouple wire to length from the reel and form the ho t junction by simply twisting the conductors together, a more substantial and reliable ho t junction is attained by welding the hot junction within an envelope of argon. Thermocouples topre-specified lengths with the hot junction formed in this manner are available on application. A further enhancement to this method is to have the welded hot junction encapsulated in apre-formed Teflon® tip. This method ensures that the frequently annoying incidence o f condensate travelling up the inner jacket of the thermocouple by capillary action, is prevented.Encapsulation further ensures that the rate of oxidisation of the thermocouple hot junction isreduced.
S P E C I F I C A T I O N
Steriliser Validation Conductor material: single flat pair, type ‘T’ (Cu/Con) thermocouple wire in Class 1 material to BS EN 60584-2:1996. Tolerance = ±0.5°C or 0.004[t].Conductor size: 1/0.3mm, 1/0.5mm or 7/0.2mm.
Conductor insulation: extruded PTFE. J acket: extruded PFA.Colour code: in accordance with BS EN 60584-1:1996.Upper temperature limit: 250°C. Hot Air Steriliser Validation Conductor insulation: Kapton®.
Product code : TE-100-PTFE
J acket: Kapton®Upper temperature limit: 350°C for short durations.Otherwise specifications as before, but not colour coded. W hen supplied on reels as standard thermocouple wire, the minimum length is 100 metres. ©
Thermal detection 2004
Teflon® and Kapton® are registered trade marks of the Dupont Corporation.