Resistance Temperature Detectors


Resistance Temperature Detectors have achieved a well deserved reputation in the industry for their superior stability and accuracy. The result makes these devices well suited for a wide variety of applications.

A Resistance Temperature Detector (RTD) senses heat based on the principle that a change in temperature results in a corresponding change in the resistance of a wire. The hotter the wires become, the larger or higher the value of their electrical resistance. RTDs are among the most precise temperature sensors available.

The RTD can be comprised of many different termination styles as seen on the following pages. The RTD element is manufactured by winding a wire of plating a film on a ceramic or glass core. Usually RTDs are provided encapsulated in probes for temperature sensing and measurement with an external indicator, controller or transmitter, or enclosed inside other devices where they measure
temperature as a part of the device’s function, such as a temperature controller or precision thermostat.


303 Series Resistance Temperature Detectors

303 Series Resistance Temperature Detectors

Superior Stability, Repeatability and Accuracy Vibration and Shock Resistant Industry Standard 3-Pin Quick Disconnect Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω/°C Commonly Installed with Compression Fittings […]

404 Series Resistance Temperature Detectors

404 Series Resistance Temperature Detectors

Superior Stability, Repeatability and Accuracy Vibration and Shock Resistant Industry Standard 3-Pin Quick Disconnect with Teflon flexible Lead Wire Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω/°C […]

707 Series Resistance Temperature Detectors

707 Series Resistance Temperature Detectors

Industrial Design with Cast Screw Cover Heads “Factory Mutual” Approved Heads in Cast Iron and Aluminum Various Male NPT Mounting Fittings are Available Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C Standard […]

808 Series Resistance Temperature Detectors

808 Series Resistance Temperature Detectors

Bare Leads Provided for Termination of Your Choice Replacement RTD Element Close Interchangeability Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ± 0.1% at 0°C is Standard Standard Temperature Coefficient .00385 Ω/Ω/°C

909 Series Resistance Temperature Detectors

909 Series Resistance Temperature Detectors

Superior Stability, Repeatability and Accuracy Vibration and Shock Resistant Supplied with a Lightweight Miniature Screw Coverhead Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ± 0.1% at 0°C is Standard Standard Temperature Coefficient .00385 Ω/Ω/°C

2101 Series Refinery Resistance Temperature Detectors Assembly

2101 Series Refinery Resistance Temperature Detectors Assembly

Complete RTD Assembly with Cast Head PVC Coated Flex Armor Provides Moisture Resistance Complete with 1/2″ NPT Mounting Adapter Design Fits Most Thermowells Standard Resistance Value 100 Ohms at 0°C, Others Available

5627 Series Magne–RTD

5627 Series Magne–RTD

Magnet Holding Force is 16 lbs. Rugged Assembly for Most Applications Measures Temperature from Any Ferrous Surface Capable of Use to 1000°F (535°C) Without Degradation The Powerful Alnico Magnet Forces the Springloaded Sensing Tip Into Contact with the Sensor Surface […]

26000 Standard RTD Thermowell Assembly

26000 Standard RTD Thermowell Assembly

Complete RTD/Thermowell Assembly Supplied with an Explosion Proof Cast Head Resistance Value 100 Ohms at 0°C Standard, Others Available Resistance Tolerance of ±0.1% at 0°C is Standard Temperature Coefficient .00385 Ω/Ω/°C Standard

26100 Series Lagged RTD Thermowell Assembly

26100 Series Lagged RTD Thermowell Assembly

Complete RTD/Lagged Thermowell Assembly Supplied with Threaded .260″ Bore Thermowell and Explosion Proof Head Resistance Value 100 Ohms at 0°C Standard, Others Available Resistance Tolerance of ±0.1% at 0°C is Standard Temperature Coefficient .00385 Ω/Ω/°C Standard

26200 Series Heavy Duty RTD Thermowell Assembly

26200 Series Heavy Duty RTD Thermowell Assembly

Complete RTD/Tappered Thermowell Assembly Supplied with Threaded .260″ Bore Thermowell Explosion Proof-Head Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C is Standard Standard Temperature Coefficient .00385 Ω/Ω/°C Standard

26250 Series Heavy Duty RTD Lagged Thermowell Assembly

26250 Series Heavy Duty RTD Lagged Thermowell Assembly

Complete RTD/Lagged Thermowell Assembly Supplied with Threaded .260″ Bore Thermowell and Explosion Proof Head Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω/°C

26300 Series Heavy Duty Thermowell Assembly

26300 Series Heavy Duty Thermowell Assembly

Complete RTD/Heavy Duty Thermowell Assembly Supplied with a .385″ Bore Tapered Thermowell and Explosion Proof Head Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω/°C

26350 Series Heavy Duty RTD Lagged Thermowell Assembly

26350 Series Heavy Duty RTD Lagged Thermowell Assembly

Complete RTD/Lagged Thermowell Assembly Supplied with a .385″ Bore Tapered Thermowell and Explosion Proof Head Standard Resistance Value 100 Ohms at 0°C, Others Available Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω/°C

26700 Series Flanged RTD Thermowell Assembly

26700 Series Flanged RTD Thermowell Assembly

Flange Fully Welded to Thermowell .260″ Bore Flanged Thermowell Assembly and Explosion Proof Head Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω°C

26800 Series Van Stone RTD Thermowell Assembly

26800 Series Van Stone RTD Thermowell Assembly

.260″ Bore Van Stone Thermowell Assembly and Explosion Proof Head Standard Resistance Tolerance of ±0.1% at 0°C Standard Temperature Coefficient .00385 Ω/Ω/°C