Thermocouples/

Resistance Temperature Detectors

Resistance temperature detectors, also known as resistance thermometers are used for accurate and reliable temperature measurement in a wide range of applications. Usually made of alloys such as nickel, copper, nickel-iron or most commonly platinum, resistance temperature detectors, or RTDs, are gradually replacing thermocouples for many temperature measuring applications.

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Thermo Sensors Corporation
Garland, TX
800-889-5478
In business since 1972, Thermo Sensors Corporation is a leading resistance temperature detector manufacturer with an array of many more products and services. Thermo Sensors provides the chemical, petrochemical, refining, food, pharmaceutical and other industries with options of standard & special designs. Contact them for information about their products, competitive pricing & rapid delivery!
 
Thermal Devices
Mt. Airy, MD
800-282-9100
TD is your source distributor for stock or made-to-order resistance temperature detectors and many other temperature handling equipment & products. Thermal Devices is determined to provide you with a positive shopping experience, involving excellent service, quality products, affordable pricing & speedy delivery. For any questions, please go to Thermal Devices website or give them a call.
 
Temperature Specialists, Inc.
St. Francis, MN
800-272-5709
Temperature Specialists, Incorporated is a manufacturer of quality resistance temperature detectors. Temperature Specialists provide solutions for your sensing needs by building to meet your specifications. Feel free to visit their comprehensive and helpful website for full descriptions of their state-of-the-art line of quality products and services or call their experts with any questions.
 
Chromalox
Pittsburgh, PA
800-443-2640
For more than 90 years, customers have relied on Chromalox for superior commercial & industrial heating solutions. They manufacture the world`s largest & broadest line of electric heat and management products, including heating components, immersion heaters, circulation systems, transfer systems, industrial & comfort air heating, heat trace cables and resistance temperature detectors.
 
Watlow Electric Manufacturing Company
St. Louis, MO
800-492-8569
Watlow® offers a complete product line by providing single source performance accountability by creating all thermal system components- from quality and affordable high resistance temperature detectors to a full staff of knowledgeable and experienced professionals ready to provide expert solutions, you can count on Watlow® to design thermal systems in which the components work together better.
 
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Resistance Temperature Detectors

Resistance temperature detectors are characterized by their linear change with respect to the relative temperature and work based on the acting principle that the change in electrical resistance of specific metals as a result of temperature is predictable and measurable. The main advantages to using resistance temperature detectors are in their provision of stable output over time as well as accuracy and repeatability in measurement recording. For many applications, accuracy in temperature control and measurement is vital, and temperature sensors are an important element of this. There are three main categories of RTDs: film, wire wound and carbon resistors. Film detectors contain a layer of platinum and are able to quickly determine temperature. Thin film resistance elements offer lower resistance and tend to be less costly. However, wire-wound thermometers are able to be used with great variations in temperature, while still producing relatively accurate temperature readings.

The devices work by using a power source, or small current, to pass through a device and help to measure the temperature of a material or substance based on its level of resistance. Resistive heating, mechanical strain and wire resistance can all affect the accuracy of the temperature reading of a RTD and therefore careful considerations should be undertaken with regard to material choice and application. The number of wires used in resistance thermometer can also affect the accuracy of the measurement with three-wire being the most widely used type of RTD as it is suitable for most purposes. Four-wire RTDs are used for processes where accuracy is essential. Despite their accuracy, there are a number of disadvantages to resistance thermometers including their potential limitations with regard to operating temperature range. Unlike thermocouples that are able to be used with extremely high temperatures, RTDs are rarely used with temperatures above 600°C. Resistance temperature devices are also less sensitive to subtle changes in temperature than other sensors such as thermistors which measure even minimal adjustments in temperature. RTDs however, have a slower response time to temperature change. They also tend to be less durable than thermocouples and so cannot be used for more rugged applications where environment or temperature can be more extreme.