Temperature RTDs


Resistance Temperature Detectors (RTD's) measure temperature, as they are among the most precise temperature sensors available with resolution and measurement uncertainties or ±0.1 °C or better possible in special designs. An RTD capitalizes on the fact that the electrical resistance of a material changes as its temperature changes, relying on the resistance change in a metal. The relationship between an RTD’s resistance and the surrounding temperature is highly predictable, allowing for accurate and consistent temperature measurement. By supplying an RTD with a constant current and measuring the resulting voltage drop across the resistor, the RTD’s resistance can be calculated, and the temperature can be determined.


Endress + Hauser has 65 different variations of RTD thermometers, featuring comprehensive and common temperature measurement technology for almost all branches of industry. Advantages of RTDs include, but are not limited to – safe monitoring of process temperatures in challenging applications, a wide choice of hygienic process connections, and cost savings by simple and fast product selection. Website
SOR Inc. manufactures multiple types of industrial and smart RTDs. Sensors are constructed using thin film technology. Ceramic elements are employed for cryogenic applications and used with a mineral insulated sheath for high vibration applications. Smart RTD sensors are available in platinum, nickel and copper and with several different resistances to temperature coefficient curves, including high accuracy RTD sensors. Website
United Electric Controls offers 21 different variations of RTDs including styles such as Terminal Head, Sanitary Process Connection, Sheath, and Heat Trace. Their RTD products are stable and have a fairly wide temperature range. Website