Resistance thermometer systems are susceptible to three types of errors:
The tolerances inherent in the resistance itself
The temperature gradients between the thermometer and the medium to be measured
The errors and defects in the connection between the sensor and the measuring instrument.
Some sources of error are electric; others result from the mechanical construction of the thermometer. Potential sources of error include interchangeability and conformity. Conformity indicates the extent to which deviation from the standard curve is permissible. Conformity has two components: a tolerance at the reference temperature, normally 0°C, and a tolerance on the slope.
These possible deviations are defined in the standards. For example, the standard DIN 43760 class B requires calibration at less than 0.12Ω (0.3°C) at 0°C, but allows the curve to deviate from the nominal 0.00385 by ±0.000012 Ω/Ω/°C. This can give deviation of 0.8°C at 100°C, 1.3°C at 200°C, and up to 3.8°C at 700°C.
It is, therefore, important to know precisely the tolerances applicable to the system used.
Our latest articles
Reading time - 5 min
Upcoming events
Book following dates in your calendar: M+R 2025 – from 03/26/2025 to 03/27/2025 – Antwerp Expo – Stand 3100, Come and visit us! Invitation : https://register.visitcloud.com/survey/22v8m6mjp0fa5?actioncode=NTWO000049WQL&partner-contact=0esxkhcpph1iu…
Why is temperature not a physical quantity like other measurement units?
Temperature is not a quantity in the strict sense of the term as the majority of other measurement units are. A quantity is something which can be increased or decreased, for example length, area, power output, etc. Measuring a quantity…
Inor : Product Launch: Innovative Field Housing and Smart Indicators
Inor is excited to introduce our brand-new field housing and indicators, designed to deliver a reliable solution in demanding environments. These products combine robust construction with practical features to ensure long-term use, even in the most challenging conditions.
Beamex: Calibration Excellence since 1975 🏆
Beamex celebrates 50 years of providing the Process Industry with a better way to calibrateMore info Here
Thermibel goes social! 🎉
We’re delighted to announce that we’ve reached a new milestone! 📲You can now follow all our news, tips, innovations and meet our team directly on your favorite platforms. Follow us on our social networks! 🌟 📘 Facebook: https://www.facebook.com/profile.php?id=61563829479501…