Typical R (T_(90)) Characteristics of Platinum Thin-Film Resistance Thermometers in the Temperature Range from -50℃ to +660℃

摘要

Today most of the available platinum thin-film (TF) resistance thermometers tend to exceed the IEC 60751 Class A tolerances for temperatures above about 400℃ and below about -50℃. The main reason for this behavior is their specific R(T_(90)) characteristic which systematically and reproducibly differs from the standard characteristic to IEC 60751. This could be proven in the context of an extensive comparison test. However, just recently the first types of a new generation of Pt TF sensors that no longer show this typical characteristic deviation but which adhere to the tolerance class A according to the IEC 60751 standard in the temperature range of ≤-50℃ to 660℃ have become available.