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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But as the temperature increases, so does the permissible deviation due to the variations possible in the TC. 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.
To ensure this control, the single ice point calibration acceptable for Class B sensors will not suffice.
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The IEC therefore states in section 4. 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.
It is more practical to look the application. But remember, when specifying a Class A RTD, you must always include the working range at which it must perform to this accuracy.
These are IEC designations of accuracy. Although conforming to the use of a 0.
Of course, classes A and B or grades A and B cannot cover every possible accuracy specification desired. Then you need to spell out your requirements for the applications engineer.
RTD Sensor Accuracy and Tolerance Standards
As we discussed earlier, you may not actually need the accuracy at this standaard, but rather the repeatability. This is not unrealistic for a well-made RTD, although it requires special selection of the sensing element at this temperature.
Keep in mind that this special selection will generally result in a longer delivery time and higher price tag on the RTD. Conversely, not all applications require even Class B accuracy. If you need to know only, “Is it hot or is it not?
There are four primary temperature scales in use today. Kelvin and Rankine, which are absolute temperature scales, and Celsius and Fahrenheit, which are not. Let’s take the freezing point of water in Celsius for example. Possible, but not likely. So which is right? The specification was poorly written.
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. Live Temperature Sensor Support.