IEC Industrial platinum resistance thermometers and platinum temperature sensors. The International Standard that specified Industrial PRT’s since has been IEC IEC Ed.2 introduces several significant technical changes with . Buy IEC Ed. Industrial platinum resistance thermometer sensors from SAI Global. STANDARDS. SUBSCRIPTIONS. Content Management Software.

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The Calibration Temperature — This is the temperature the thermometer is being tested at The Pt Thermometer reading — This is the reading the Pt thermometer gave at this known temperature The uncertainty remaining at the calibrated temperature points.

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This site uses Akismet to reduce spam. Your Pt Thermometer is tested against a known reference standard and a certificate of calibration is produced. But as the temperature increases, so does the permissible deviation due to the variations possible in the Standagd.

Specific changes in the new edition include:. If you cross reference the temperature you are likely to be measuring and add them to the tolerance of the Pt unit you can calculate standatd Class of probe will be suitable for your application.

It is important to understand that just like K-Type thermometers there are 3 main areas of uncertainty when using Pt thermometers. The International Electrotechnical Commission IEC has published the second edition of its standard on industrial platinum resistance thermometers and platinum temperature sensors.


The specification was poorly written.

This is the accuracy of the device that actually interprets the signals from the probe and displays your reading. The standard specifies 4 classes of accuracy. Because a well manufactured RTD will have high repeatability relative to the applicationClass B accuracy is generally sufficient unless there is a need for better interchangeability; or when measuring change of temperature; or idc you know that you have special accuracy requirements.

Keep in mind that this special selection will generally result in a longer delivery time and higher price tag on the RTD.

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How to Mitigate Safety Risks in the Workplace. The table below shows the tolerances of each Class of probe at various temperatures.

Aside from these cases, it is generally better to state your requirements in terms of temperature tolerance in degrees over the temperature range where it is actually required.

Learn how your comment data is processed. Possible, but not likely. Live Temperature Sensor Support. If you need to know only, “Is it hot or is it not? Specific changes in the new edition include: How to Integrate Demand-driven Planning with Maintenance. This is where thing start to get a little more complex. The uncertainty of the unit The uncertainty of the probe Uncertainty of any calibration procedure So lets break it down.


To ensure this ieec, the single ice point calibration acceptable for Class B sensors will not suffice. The IEC therefore states in section 4. The class of the probe dictates how much the probe can drift away from this curve. Each probe has a different level of tolerance.

RTD Sensor Accuracy and Tolerance Standards

In the examples below we used our own Pt model. The standard also defines the relationship between temperature and the electrical resistance of the thermometer, allowing for the replacement of sensors independent of their manufacturers.

Of course, classes A and B or grades A and B cannot irc every possible accuracy specification desired. This would be displayed as follows this is an example only Calibration Temperature Thermometer Reading Hi Santhu, It is just a case of accuracy.

There are four primary temperature scales in use today. Subscribe Today Reliable Plant Newsletters. This is not unrealistic for a well-made RTD, although it requires special selection of the sensing element at this temperature.