RTD Wire

RTD wire carries the signal generated by RTD (Resistance Temperature Detectors) and is designed to minimize addition resistance in temperature measurement signal along with being able to withstand harsh environments.

• RTD Wire is different than Thermocouple wire. The RTD wire cannot generate a measurable temperature signal as is within the capabilities of thermocouple wire or thermocouple extension wire.  
• Wire Construction is typically 2, 3 or 4 wires in a twisted configuration. 
  
• A parallel 2 wire design can be used for a flat pass thru and related
  applications. Ribbon cables in 3 and 4 wire constructions are also utilized at times with special surface RTD sensors.
• Bare wire is typically made with copper stranded wire with a nickel, silver or tin plating to provide protection from corrosion and or enhance a solder connection.
• RTD probe or RTD sensor assemblies Lead Wire is commonly 26 gage stranded (7/34 - 7 strands of 34 gage wire) or 24 gage stranded (7/32 - 7 strands of 32 gage wire).
• 28 gage stranded or smaller diameters can be used to accommodate a space limitation within the RTD assembly itself 
• Transmitters, terminal connections or lead wire to instrumentation is typically 24 gage stranded or larger to minimize the lead resistance and provide additional strength. 
• Insulation on RTD wire is commonly PFA, PTFE or FEP with capabilities in the range of -328° F to 500°F (-200 to 260°C) and with similar mechanical or electrical properties to Dupont's trade name Teflon type materials.
• Higher Temperature applications use fiber braided materials such as Fiberglass with a 900°F (482°C) and at times the insulation is covered with a Stainless Steel Braid to provide durability. 
• Twisted and Shielded wire designs with a ground wire are utilized in applications where electrical interference is a concern.  
• PVC (Polyvinyl Chloride) is used at in control room or less harsh environments for potential cost reductions.