This standard specifies the requirements and temperature/resistance relationship for industrial platinum resistance temperature sensors (later referred to as “platinum resistors” or "resistors") and industrial platinum resistance thermometers (later referred to as "thermometers"), whose electrical resistance is a defined function of temperature.
This standard applies to platinum resistors whose temperature coefficient α, defined as is conventionally written as α = 3.851×10-3°C-1,
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where: R100 is the resistance at t = 100°C and R0 is the resistance at t = 0°C.
Values of temperature in this standard are in terms of the International Temperature Scale of 1990 (ITS-90). Temperatures in degrees Celsius (°C) are denoted by the symbol t, except in Table 1 where the full nomenclature t90/°C is used.
This standard covers resistors or thermometers for all or part of the temperature range -200°C to +850°C with different tolerance classes, which may cover restricted temperature ranges.
For temperature/resistance relationships with uncertainties <0.1°C, which are possible only for resistors or thermometers with exceptionally high stability and individual calibration, a more complex interpolation equation than is presented in this standard may be necessary. The specification of such equations is outside the scope of this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
