IEC Issues Updated Standard for Industrial Platinum Resistance Thermometers, Temperature Sensors - IEC 60751
August 4, 2008 // Published as a news service by IHS
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The International Electrotechnical Commission (IEC) published the second edition of IEC 60751 - Industrial platinum resistance thermometers and platinum temperature sensors.
Most temperature measurements in the range below 400 degrees Celsius (C) are performed with industrial resistance thermometers.
IEC 60751 defines minimum requirements on the quality of these thermometers, which leads to different tolerance classes.
The relation between the temperature and the electrical resistance of the thermometer is defined in IEC 60751, which allows the replacement of sensors independent of their manufacturers.
IEC 60751 takes into account the modified users' needs and evolving technologies used by manufacturers.
Tolerance classes are given separately for resistors (sensors) and thermometers as well as for wire-wound resistors and film resistors.
The number of tolerance classes was increased from two to four and the tolerance acceptance test takes into account the measurement uncertainty of the test.
Although IEC 60751 covers sensors or thermometers for all or part of the temperature range between -200 C to + 850 C, the most common devices are the platinum (Pt)-100 thermometers, which have a nominal resistance of 100 ohms at 0 C, according to the IEC.
IEC 60751 was developed by IEC Subcommittee 65B Devices and Process Analysis.
Source: International Electrotechnical Commission (IEC).