IEC 60751 is a standard that specifies the requirements for industrial platinum resistance thermometers (PRTs) with an alpha of 0.00385. The standard defines the characteristics of PRTs, including their temperature-resistance relationship, accuracy, interchangeability, and calibration methods.

IEC 60751 provides a detailed description of the requirements for PRTs in terms of their resistance-temperature characteristics, construction, calibration, and testing. The standard defines the temperature range and tolerance limits for PRTs and also specifies the minimum requirements for their interchangeability. The accuracy classes defined in the standard range from Class A to Class C, with Class A having the highest level of accuracy.

This standard is widely recognized and used in the industry for the calibration and testing of temperature measurement devices. It provides guidelines for the design and manufacturing of PRTs, as well as for the calibration and testing of PRT-based temperature measurement systems.

IEC 60751 and DIN EN 60751 are essentially the same standard. DIN EN 60751 is the German adoption of the IEC 60751 standard, which means that it is the same standard but has been translated into German and adopted by the German National Committee of the IEC. In general, most countries have their own national committees that adopt and translate IEC standards, and these national standards are equivalent to the original IEC standard.

What is ASTM E1137?
ASTM E1137 is a standard test method for determining the performance of a thermistor thermometer for measuring surface temperature. It involves measuring the response time and temperature coefficient of the thermistor at various test points and comparing the results to specified limits. The standard is intended for use with thermistors that have a resistance-temperature characteristic that is approximately linear over the range of temperatures being measured.