Resistance Temperature Detectors (RTD’s)

Resistance Temperature Detectors (RTD’s) are available for applications where lower temperature and less severe environment can support these highly accurate and consistent sensors. Their higher signal output provides modern instrumentation systems with more precise input, while reducing the chance of error from electrical interference. RTD’s are less likely than thermocouples to drift over time, and their interchangeability provides a greater degree of consistency for monitoring and controlling efforts in most applications.

The lower cost of copper instrument wire required for connecting RTD’s also provides a cost advantage for expansion or replacement projects versus the higher cost of thermocouple wire.

The standard constructions below and general styles shown on the following pages can be adapted as needed to accommodate the requirements of specific applications.

Standard options to consider and discuss include:

  • Tolerances: Class B (standard), unless specified otherwise
  • Temperature: -250 to +600°C (-418 to +1112°F)
  • Sheath: 316SS packed with mineral insulation to protect the element
  • Leads: 3-wire compensating design - 2 red/1 white. (2-wire and 4-wire are available)
  • Lead Insulation: Teflon, Fiberglass, or Ceramic
  • Mounting Fittings for springloading or to control immersion
  • Metal protection tubes and drilled barstock thermowells