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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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. The specification was poorly written. The class stsndard the probe dictates how much the probe can drift away from this curve.

How to Mitigate Safety Risks in the Workplace. Your Pt Thermometer stamdard tested against a known reference standard and a certificate of calibration is produced. 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.

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

The uncertainty of measurement for the thermometer is. Platinum resistance thermometers are among the most accurate temperature sensors, and are relatively immune to electrical noise, making them particularly well suited for industrial environments.


The uncertainty of the unit Atandard uncertainty of the probe Uncertainty of any calibration procedure So lets break it down. Each probe has the capacity to drift away from this curve reducing accuracy. Not only 60715 this informs the user of any adjustments to be made to the reading at the desired temperature.

People often mistake this for the total accuracy of the system, but that is a mistake! Although conforming to the use of a 0. But remember, when specifying a Class A Standare, you must always include the working range at which it must perform to this accuracy. 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. These are IEC designations of stnadard. It is more practical to look the application.

The minimum and maximum temperatures standdard 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.

Toggle navigation Toggle search. Specific changes in the new edition include: Learn how your comment data is processed. So which is right?

This is the number you will most commonly see listed in product descriptions. As we discussed earlier, you may not actually need the accuracy at this point, but rather the repeatability. If you need to know only, “Is it hot eic is it not?


Possible, but not likely. To ensure this control, the single ice point calibration acceptable for Class B sensors will not suffice. Each probe has a different level of tolerance.

The standard specifies 4 classes of accuracy. This site uses Akismet to reduce spam.

Pt RTD Colour codes IEC

How to Integrate Demand-driven Planning with Maintenance. Subscribe Today Reliable Plant Newsletters. In the examples below we used our own Pt model. This one is nice and simple, but often misunderstood. Let’s take the freezing point of water in Celsius for example. 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.

This would be displayed as follows this is an example only Calibration Temperature Thermometer Reading Build Processes That Drive Consistency.

IEC revises standard on thermometers and sensors

It is important to understand that just like K-Type thermometers there are 3 main areas of uncertainty when using Pt thermometers. Specific changes in the new edition include:. This is not unrealistic for a well-made RTD, although it requires special selection of the sensing element at this temperature.