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Pt100 Probe
A Pt100 probe is an assembly composed of an RTD element, a sheath, a lead wire, and a termination or connection. The Pt100 is a temperature sensor that contain a resistor that changes resistance value as its temperature changes.
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Omega's RTD probe with lead wire offers choice of 2-3- or 4-wire configuration. This is available in three temperature ranges covering -200°C to 600°C (-328 to 1112°F)
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RTD probes that are Ideal for pressurized containers. Have a 1/8" NPT or 1/8 BSPP (G 1/8) mounting thread, 4-pin M12 A-coded connector and molded transition.
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Our PR-14 series RTD probe has miniature aluminum protection head and screw-on cap with chain. It includes PT100 Ω or PT1000 Ω RTD element, and 1/2" NPT mounting threads
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The PR-13 RTD probe assembly has a 3-prong Omega "OTP" standard style connector for easy connection to extension cables, hand-held meters or other instrumentation.
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Discover the Rugged RTD Probe series featuring insulated wire and metal strain relief. Ideal for various applications, available in multiple lengths and diameters.
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Omega's RTD terminal block probe features a large terminal block connector, with large pan head screws for easy connection and also can be secured with a compression fitting.
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This connector-style probe has a 3-prong Omega "MTP" mini connector for easy connection to extension cables and handheld meters. Probe diameter is 1/8".
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Class A 100 or 1000 ohm platinum RTD immersion probes with a molded plastic 4-pin M12 connector and 316 SS sheath. Available in a variety of lengths and diameters.
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RTD Sensors great for installing into pipes or limited space applications. Single and Dual element designs, 1/8" or 1/4" NPT mounting threads available with 72" of lead wire.
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RTD immersion probes that are bendable, have NPT mounting threads and various sheath size options. Come standard with a 4-pin M12 connector and 316 SS sheath.
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RTD probes that have a 4 to 20 milliamp programmable/scalable output and a molded M12, A-coded connector. Various lengths and diameters available.
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100 or 1000 ohm platinum RTD immersion probes with a molded plastic 3-pin M8 connector and 316SS sheath. Available in a variety of lengths, diameters, and accuracies
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RTD probes that can be cut to the desired length with a standard tube cutter to fit field applications. Plastic plug in tube end protects the wires from sharp edges.
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RTD probes intended for use in thermowells. Spring loaded for optimal thermal contact. Include an adjustable spring, 1/2" NPT threaded fitting & 4-pin molded M12 connector.
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Omega's PR-18 series probe with standard aluminum protection head with flip-top includes PT100 Ω platinum RTD element or PT1000 RTD element and 1/2" NPT mounting threads.
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This industrial probe has subminiature aluminum protection head and screw-on cap and is made with a 316 stainless steel sheath. Has 1/2" NPT mounting threads.
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Omega's "BX" armored probe is designed for resistance to abrasion and snagging and excessive movement. Comes with choice of PFA- or fiberglass-coated wires.
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Class A, pt100 RTD immersion probes with 1/8" NPT mounting threads. 40 inch long PFA insulated lead wires and 3-prong connector come standard.
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Class A, pt100 RTD probe ideal for gas and air applications. Has a flanged housing and small diameter probe to allow easy mounting into ducts and flow systems.
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Handheld RTD probes with a removable plastic handle and retractable cable. Probe styles include immersion, penetration and air probes with 3-prong connectors.
The Termination
Pt100 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 and RTD extension cables are offered in one of four configurations. 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 Pt100 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.
Lead Configurations of Pt100 Probes
Lead configuration 1 provides one connection to each end of the sensor. This construction is suitable where the resistance of the run of lead wire may be considered as an additive constant in the circuit, and particularly where the changes in lead resistance due to ambient temperature changes can be ignored.
Note: The resistance of probe and extension is added to the sensor resistance and will increase the measured value.
Style 1 
Style 2 
Style 3 
Style 4
Lead configuration 2 (Standard) provides one connection to one end and two to the other end of the sensor. Connected to an instrument designed to accept three-wire input, compensation is achieved for lead resistance and temperature change in lead resistance. This is the most commonly used configuration.
Lead configuration 3 provides two connections to each end of the sensor. This construction is used for measurements of the highest precision.
Lead configuration 4 is similar to Lead Configuration 3 except that a separate pair of wires is provided as a loop to provide compensation for lead resistance and ambient temperature changes in lead resistance.
In this article, the different options to wire an RTD Pt100 probe are explained.
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