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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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Class B, pt100 RTD probes have a copper tip that provides enhanced temperature response. Available in 2, 3, or 4 wire configurations and various sizes.
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Temperature transmitters with IO-Link/PNP Switch/4-20mA outputs, with a scalable measuring range from -50 to 200°C. All wetted parts are 316L stainless steel for sanitary applications.
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Handheld RTD probes have a plastic handle with a retractable cable. Probe styles include immersion, reduced diameter tip, penetration and air probes.
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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.
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Thin-film element RTD probes with 1/8" NPT brass compression fittings and armored cable. Commonly used in extruder & molding equipment. Straight and bend options available.
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RTD probes with 1/8" NPT brass compression or bayonet fittings and armored cable. Commonly used in extruder & molding equipment. Both straight and bend options available.
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Immersion probe with bracket for easy mounting. Often used in appliance & lab temp applications up to 500°C. Great for air, gas, or liquid measurement.
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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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Spring-loaded quick-connect bayonet style RTD probes with armored cable. Commonly used in extruder & molding equipment. Both Straight and bend options available.
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Probe contains an integrated circuit (IC) transducer AD592CN that provides an output in microamps that is proportional to temperature. Requires 4 to 30 VDC input voltage.
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Sanitary type T, J, and K thermocouple probes with PFA coated integral cable with strain relief. For use in Food & Beverage, Pharmaceuticals and wash down areas.
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3-A sanitary type T, J, and K thermocouple probes with polypropylene or stainless steel protection heads. For use in Food & Beverage, Pharmaceuticals and wash down areas.
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10,000Ω thermistor probes with polypropylene protection head and ±0.2°C accuracy. For use in Food & Beverage, Pharmaceuticals, wash down and other hygienic areas.
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Sanitary 10,000Ω at 25°C Thermistor probes with PFA coated integral cable with strain relief. For use in Food & Beverage, Pharmaceuticals and wash down areas.
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10,000Ω thermistor probes with M12 connector and ±0.2°C accuracy. For use in Food & Beverage, Pharmaceuticals, wash down and other hygienic areas.
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The OM-CP-HITEMP140X2-FP Series of dual channel high temperature data loggers feature a stainless steel data logger body that accommodates two flexible or bendable probes.
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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