Objective
Type K (nickel-chromium/nickel-aluminium) thermocouples are widely used in industry for measuring temperature in the range 200 C to 1000 C but drift by more than 5 C in the range 300 C to 500 C due to metallurgical ordering and disordering (the hysteresis effect). Nickel-chromium-silicon/nickel-silicon-magnesium thermocouples (known as Nicrosil/Nisil or Type N) were developed in order to overcome this problem, although they have not yet been widely adopted. Both Type K and Type N thermocouples, when used in their mineral insulated form with stainless steel or Inconel sheaths, can show large calibration drifts above 1000 C due to contamination from the sheaths.
Recently, Type N thermocouples have been developed which are sheathed in alloys similar in composition to Nicrosil and should have lower calibration drifts above 1000 C due to contamination. The project was aimed at investigating the high temperature stability of such thermocouples from two different sources under continuous exposure to progressively higher temperatures and conditions of temperature cycling. Measurements were also made with Inconel-sheathed Type K thermocouples for comparison purposes.
RESULTS
The measurements established the limits of temperature exposure to which mineral insulated metal sheathed thermocouples can be subjected without failing or drifting unacceptably: up to 1300 C for Type N thermocouples sheathed in Nicrosil related alloys or upto 1200 C for Type K Inconel sheathed thermocouples.
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Programme(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
TW11 0LW Teddington
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.