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 International Electrotechnical Commission IEC has published the second edition of its standard on industrial platinum resistance thermometers and platinum temperature sensors. Keep in mind that this special selection will generally result in a longer delivery time and higher price tag on the RTD.

Although conforming to the use of a 0. Your Pt Thermometer is tested against a known reference standard and a certificate of calibration is produced. Possible, but not likely.

Minco Components – What is class A and class B tolerance classes for RTDs?

In the examples below we used our own Pt model. This one is nice and simple, but often misunderstood. From our previous calculations we stanfard that at the standard calibration temperature points we offer, our own Pt with a Class B probe would normally have the following accuracy uncertainties. People often mistake this for the total accuracy of the system, but that is a mistake! Temperature is one of the most frequently used parameters in industry, and accuracy in its measurements is critical for the chemical, pharmaceutical, metal, and food sectors.

This is the number you will most commonly see listed in product descriptions. 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.


Live Temperature Sensor Support. Toggle navigation Toggle search. This is not unrealistic for a well-made RTD, although it requires special selection of stanfard sensing element at this temperature.

Each probe has a different level of tolerance.

But as the temperature increases, so does the permissible deviation due to standarr variations possible in the TC. As we discussed earlier, you may not actually need the accuracy at this point, but rather the repeatability. Conversely, not all applications require even Class B accuracy. How to Integrate Demand-driven Planning with Maintenance. 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 standatd.

This is the accuracy of the device that actually interprets the signals from the probe and displays your reading.

But remember, when specifying a Class A RTD, you must always include the working range at which it must perform to 60715 accuracy. The Best Gets Better: Each probe has the capacity to drift away from this curve reducing accuracy. The table below shows the tolerances of each Class of probe at various temperatures.

The minimum and maximum temperatures of the stated working range are conve-nient points to chose and will ensure Class A accuracy, but will at the same time tend to drive up the cost of the sensor.

How to Mitigate Safety Risks in the Workplace. Of course, classes A and B or grades A and B cannot cover every possible accuracy specification desired. To ensure this control, the single ice point calibration acceptable for Class B sensors will not suffice.

This site uses Akismet to reduce spam. This is where thing start to get a little more complex. The class of the probe dictates how much the probe kec drift away from this curve.


Specific stansard in the new edition include: 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 if you know that you have special accuracy requirements.

Learn how your comment data is processed. Kelvin and Rankine, which are absolute temperature scales, sandard Celsius and Fahrenheit, which are not.

RTD Sensor Accuracy and Tolerance Standards

The Calibration Temperature — This is the temperature the thermometer is being tested at The Pt Stahdard reading — This is the reading the Pt thermometer gave at this known temperature The uncertainty remaining at the calibrated temperature points. There are four primary temperature scales in use today. Hi Santhu, It is just a case of accuracy.

If you need to know only, “Is it hot or is it not?

It kec more practical to look the application. Calibration is a fantastic tool for eliminating the known uncertainty that comes with every instrument. The uncertainty of measurement for the thermometer is. 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. The specification was poorly written.