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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It is important to understand that just like K-Type thermometers there are 3 main areas of uncertainty when using Pt thermometers. This one is nice and simple, but often misunderstood. This is the accuracy of the device that actually interprets the signals from the probe and displays your reading.

IEC revises standard on thermometers and sensors

This is the number you will most commonly see listed in product descriptions. People often mistake this for the total accuracy of the system, but that is a mistake! This is where thing start to get a little more complex. Each probe has a different level of tolerance. The standard specifies 4 classes of accuracy.


IEC revises standard on thermometers and sensors

Each probe has the capacity to drift away from this curve reducing accuracy. The class of the probe dictates how much the probe can drift away from this curve.

In the examples below we used our own Pt model. The table below shows the tolerances of each Class of probe at various temperatures.

ATP Instrumentation Ltd

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 which Class of probe will be suitable for your application.

Calibration is a fantastic tool for eliminating the known uncertainty that comes with every standdard.

Your Pt Thermometer is tested against a known reference standard and a certificate of calibration is produced. From our previous calculations we know that at the standard calibration temperature points we offer, our own Pt with a Class B probe would normally have the following accuracy uncertainties.


The uncertainty of measurement for standagd thermometer is. Not only does this informs the user of any adjustments to be made to the reading at the desired temperature. This site uses Akismet to reduce spam.

Learn how your comment data is processed. The uncertainty of the unit The uncertainty of the probe Uncertainty of standqrd calibration procedure So lets break it down.

The Calibration Temperature — This is standaed 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.

This would be displayed as follows this is an example only Calibration Temperature Thermometer Reading Hi Santhu, It is just a case of accuracy.