Temperature sensors: Comprehensive line of RTDs

Technology offers combination of precision and robustness for critical applications.

By Control Engineering Staff January 22, 2009

Watlow’s line of RTDs (resistance temperature devices) continues to grow, offering a full range of standard and custom configurations to solve a wide variety of temperature measurement applications.

Watlow says its RTD sensors are designed to ensure precise and repeatable measurements while meeting environmental requirements for each application. A high signal-to-noise output characteristic of the technology increases the accuracy of data transmission and permits greater distances between the sensor and the measuring equipment. RTD sensors can be configured to meet specific application needs with options including element type, lead wire configuration, termination style, sheath materials, lengths and diameters, process connection heads, transmitters, thermowells, spring loading, flanges, and surface mount packages.

Watlow RTDs reportedly offer a high degree of accuracy over a wide operating range of -200 to 650 °C (-328 to 1,202 °F). The linear change in resistance per degree change in temperature simplifies signal processing and requires no cold junction compensation like that found in a thermocouple. The product family has a positive coefficient (resistance increases as temperature increases).

These sensors work in a variety of industries including processing, food equipment, plastics processing, petrochemical processing, microelectronics, and air, gas and liquid temperature measurement.

—Edited by Peter Welander, process industries editor, PWelander@cfemedia.com , Control Engineering Process Instrumentation & Sensors Monthly Register here and scroll down to select your choice of free eNewsletters .