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RTD Resistance Temperature Detectors ( Printable Version ) | |||||||||||||||||||||||||||||||||||||
The ProbeA probe is an assembly composed of an element, a sheath, a lead wire, and a termination or connection. The Termination Probes may be terminated in a connection head, quick disconnect, terminal block, or extension wire. OMEGA’s standard terminations are pictured on product pages. Other termination styles are available upon special request. For something other than standard products, please contact our sales team to submit a full description and/or sketch of your desired version. The Lead Wire Lead styles are offered in one of four configurations (see diagrams at the side of this page). Style 2 is OMEGA’s standard. Be sure to select the configuration that is compatible with your instrumentation. The Sheath The sheath, a closed end tube, immobilizes the element, protecting it against moisture and the environment to be measured. The sheath also provides protection and stability to the transition lead wires from the fragile element wires. OMEGA’s standard sheaths are 3 mm (1/8") and 6 mm (1/4") O. D. 304 stainless steel tubes. Other O.D.’s and materials are available upon request. The Element The standard OMEGA® RTD probe is made with a 100 ohm platinum European curve element (á = 0.00385). Temperature Rating OMEGA’s "PR" style RTD probe assemblies are rated for use in temperatures up to 600°C (1110°F). The "PRTF" style probes are rated up to 260 or 500ºC depending on construction Temperature limitations may be placed on termination styles due to the wire insulation used. The maximum temperature rating available on special order is 750°C (1380°F). If probe is intended for high temperature use, please request a quotation. OMEGA stocks a broad line of RTD probes for immediate delivery. Many special assembly probes are available for shipment within two weeks of receipt of your order. Please consult Sales Department for further details on your special needs. Definition of RTD Probe Part Number
Lead Configurations of RTD Probes
When accuracy over a wide temperature range is a crucial factor in industry, OMEGA's platinum Resistance Temperature Detectors (RTD’s) are unequalled in performance. Stability over long periods of continued use makes them unmatched for reliability. Precision materials and workmanship make them highly interchangeable for easy replacement without calibration. Definition A resistance temperature detector operates on the principle of the change in electrical resistance in wire as a function of temperature. Element or Probe? A common source of confusion is the distinction between an element and a probe. The Element An element is the actual temperature sensing unit. OMEGA features two styles of elements: wire wound and thin film. Wire Wound Wire wound RTD elements used are made of 99.99% pure platinum wire wound about a ceramic or glass core and hermetically sealed within a ceramic or glass capsule. Platinum wire was chosen because it best meets the needs of precision thermometry. It resists contamination and is mechanically and electrically stable. Extension leads are attached by welding at OMEGA or by the end user. These RTD’s provide close interchangeability between elements with negligible drift and error with age. On special request, OMEGA can make RTD probes with other wire materials. The probes are available conforming to the following two curves: European (E) α = 0.00385 ohms/ohm/°C or American (A) α = 0.00392 ohms/ohm/°C. Standard OMEGA® probes conform to the European (E) curve. When you order, specify an "A" suffix instead of "E" if the American curve is desired. The calibration of all "E" elements meets "0. 1% DIN" standard tolerance and conforms to the DIN 43760 standard, shown in the table. Thin Film Made by depositing platinum as a film on a substrate and then encapsulating both. This method allows for the production of small, fast response, accurate sensors. Thin film elements also conform to the IEC60751 curve. Platinum Resistance Elements Allowable Deviation from Calibration Values
Wire Wound Element Model Numbers Example: 2PT100G3550 2 2 windings (double resistance element) PT Platinum wire 100 Resistance in ohms at 0°C G Glass core 35 Length of element in mm 50 This value divided by 10 gives element diameter in mm  KN Series ceramic wire wound platinum RTD elements. Click here for details. Recommended Temperature Application Ranges-Platinum RTD Elements  |
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Type: Select style PR- or PRTF-10, -11, -12, -13, -14, -15, -16, -17, -18, -19.
