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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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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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RTD immersion probes that have various tapered & straight mounting thread and sheath size options. 4-wire RTD construction with a M12, A-coded 4-pin connector.
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RTD probes that have a 4 to 20 milliamp programmable/scalable output, molded body, and M12 connector. Available with either 1/8" NPT or BSPP (G1/8) mounting threads.
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RTD probes with a 4-pin M12 connector and a copper tip that ensures a faster response time. Various tapered and straight mounting thread & probe size options available.
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RTD probes that have a 4 to 20 milliamp programmable/scalable output, SS body, and M12 connector. Available with either 1/8" NPT or BSPP (G1/8) mounting threads.
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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 are spring loaded for optimal thermal contact in thermowells. Include a spring, 1/2NPT threaded fitting, and M12 connector. 2, 3, and 4-wire options available.
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This RTD probe has stainless steel-overbriaded wires which offers durability for applications where the wire is continually moving or exposed to sharp objects.
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RTD immersion probes that are bendable, have metric or BSPP mounting threads and various sheath size options. Come standard with a 4-pin M12 connector and 316 SS sheath.
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PT100 Class A accuracy 3-A Sanitary 4-wire RTD probe with M12 connector. For use in Food & Beverage, Pharmaceuticals and wash down areas.
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1/16",or 1.5mm diameter RTD probes available with lead wire, 3-prong connector, or handle probe. Small size provides maximum sensitivity and response time to temperature.
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Fine diameter hypodermic needle temperature probes for use in industrial, research and laboratory applications. Needle sizes range from .008" to .065" in diameter.
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PT100 Class A accuracy Sanitary 4-wire RTD probe with PFA coated integral cable with strain relief. For use in Food & Beverage, Pharmaceuticals and wash down areas.
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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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PT100 Class A accuracy 3-A Sanitary 4-wire RTD probe with stainless steel or polypropylene protection head. For use in Food & Beverage, Pharmaceuticals and wash down areas.
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Temperature transmitters with IO-Link/PNP Switch/4-20mA outputs, with a scalable measuring range from -50 to 200°C. IP69K rated 316L stainless steel housing for harsh environments.
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RTD immersion probes that are bendable and available in a variety of sizes. Have a IP65 molded M12, A-coded 4-pin connector (max temperature is 260°C). Vibration resistant.
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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 probes have a copper tip that provides enhanced temperature response. Available in 2, 3, or 4 wire configurations and various sizes.
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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