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.

Author: Brajind Vutaxe
Country: Kenya
Language: English (Spanish)
Genre: Technology
Published (Last): 27 June 2011
Pages: 277
PDF File Size: 12.29 Mb
ePub File Size: 9.10 Mb
ISBN: 773-9-71014-758-5
Downloads: 63042
Price: Free* [*Free Regsitration Required]
Uploader: Shakalmaran

The Best Gets Better: How to Integrate Demand-driven Planning with Maintenance.

Although conforming to the use of a 0. Conversely, not all applications require even Class B accuracy.

Engineering Tools

Specific changes in the new edition include: Your Pt Thermometer is tested against a known reference standard and a certificate of calibration is produced. Hi Santhu, It is just a case of accuracy. These are IEC designations of accuracy. This is where thing start to get a little more complex. This would be displayed as follows this is an example only Calibration Temperature Thermometer Reading The uncertainty of measurement for the thermometer is.

It is more practical to look the application. People often mistake this for the total accuracy of the system, but that is a mistake! It is important to understand that just like K-Type thermometers there are 3 main areas of uncertainty when using Pt thermometers. Let’s take the freezing point of water in Celsius for example. 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.

The standard specifies 4 classes of accuracy.

This one is nice and simple, but often misunderstood. From our previous calculations we know that 607751 the standard calibration temperature points we offer, our own Pt with a Class B probe would normally have the following accuracy uncertainties. This is the number you will most commonly see listed in product descriptions. This site uses Akismet to reduce spam. Kelvin and Rankine, which are absolute temperature scales, and Celsius and Fahrenheit, which are not. 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 kec cost of the sensor.


To ensure this control, the single ice point calibration acceptable for Class B sensors will not suffice. In the examples below we used our own Pt model. Lubricant Storage and Handling. Temperature is one of the most frequently used parameters in industry, and accuracy in its sgandard is critical for the chemical, pharmaceutical, metal, and food sectors.

How to Mitigate Safety Risks in the Workplace. Not only does this informs the user of standarv adjustments to be made to the reading at the desired temperature. But remember, when specifying a Class A RTD, you must always include the working range at which it sgandard perform to this accuracy.

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

Pt Accuracy and Probe Classification – ATP Instrumentation Ltd

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 607511 at the calibrated temperature points. The specification was poorly written. If you need to know only, “Is it hot or is it not?


Subscribe Today Reliable Plant Newsletters. The class of the probe dictates how much the probe can drift standar from this curve. But as the temperature increases, so does the permissible deviation due to the variations possible in the TC. As we discussed earlier, you may not actually need the accuracy at this point, but rather the repeatability.

RTD Sensor Accuracy and Tolerance Standards

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. So which is right? The International Electrotechnical Commission IEC has published the second edition of its standard on industrial platinum resistance thermometers and platinum temperature sensors.

The table below shows the tolerances of each Class of probe at various temperatures. Live Temperature Sensor Support.

Of course, classes A and B or grades A and B cannot cover every possible accuracy specification desired. Keep in mind that this special selection will generally result in a longer delivery time and higher price sttandard on the RTD. Then you need to spell out your requirements for the applications engineer.

The IEC therefore states in section 4. 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.