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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This site uses Akismet to reduce spam. The uncertainty of measurement for the thermometer is. Possible, but not likely. 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. Kelvin and Rankine, which are absolute temperature scales, and Celsius and Fahrenheit, which are not.
There are four primary temperature scales in use today. People often mistake this for the total accuracy of the system, but that is a mistake! 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.
In the examples below we used our own Pt model. 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.
Then you need to spell out your requirements for the applications engineer. This is where thing start to get a little more complex. 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. The class of the probe dictates how much the probe can drift away from this curve.
RTD Sensor Accuracy and Tolerance Standards
But remember, when specifying a Class A RTD, you must always include the working range at which it must perform to this accuracy. Keep in mind that this special selection will generally result in a longer delivery time and higher price tag on the RTD. 600751 is important to understand that just like K-Type thermometers there are 3 main areas of uncertainty when using Pt thermometers.
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.
This is the number you will most commonly see listed in product descriptions. The standard specifies 4 classes of accuracy. If you need to know only, “Is it hot or is it not?
Pt Accuracy and Probe Classification – ATP Instrumentation Ltd
As we discussed earlier, you may not actually need the accuracy at this point, but rather the repeatability. 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.
Not only does this informs the user of any adjustments to be made to the reading at the desired temperature. Toggle navigation Toggle search.
Although conforming to the use of a 0. This would be displayed as follows this is an example only Calibration Temperature Thermometer Stqndard The specification was poorly written. 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.
How to Mitigate Safety Risks in the Workplace. Build Processes That Drive Consistency. 600751 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.
This is the accuracy of the device that actually interprets the signals from the probe staneard displays your reading. Let’s take the freezing point of water standagd Celsius for example. Learn how your comment data is processed. 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.
Pt100 RTD Colour codes IEC 60751
Each probe has standzrd capacity to drift away from this curve reducing accuracy. This is not unrealistic for a well-made RTD, although it requires special selection of the sensing element at this temperature. 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.
Live Temperature Jec Support. Specific changes in the new edition include: Specific changes in the new edition include:. Lubricant Storage and Handling. It is more practical to look satndard application.
Of course, classes A and B or grades A and B cannot cover every possible accuracy specification desired. Your Pt Thermometer is tested against a known reference standard and a certificate of calibration is produced. How to Integrate Demand-driven Planning with Maintenance. The uncertainty of the unit The uncertainty of the probe Uncertainty of any calibration procedure So lets break it down. So which is right?
Hi Santhu, It is just a case of accuracy. Calibration is a fantastic tool for eliminating the known uncertainty that comes with every instrument. To ensure this control, the single ice point calibration acceptable for Standars B sensors will not suffice. The IEC therefore states in section 4.
Conversely, not all applications require even Class B accuracy. Each probe has a different level of tolerance.