Resistance Temperature Detectors

Resistance Temperature Detectors (RTDs) accurately sense temperature with an excellent degree of repeatability and interchangeability of elements.

The RTD is composed of certain metallic elements whose change in resistance is a function of temperature. In operation, a small excitation current is passed across the element, and the voltage, which is proportional to resistance, is then measured and converted to units of temperature calibration.

The RTD element is manufactured by winding a wire (wire wound elements) or plating a film (thin film elements) on a ceramic or glass core and sealing the element within a ceramic or glass capsule.

Since the most popular RTDs are platinum elements with a low initial resistance, often 100 ohms, and have a small change in resistance per unit of temperature range, the resistance of the lead wire is often compensated for with a three- or four-wire bridge configuration built into the measuring devices. By selecting the proper elements and protective sheathing, RTDs can operate in a temperature range of -328 to 1202°F (-200 to 650°C).

Antech Sales offers RTDs for many industry applications. From single- or dual-element RTDs to PT100s to Sanitary CIP types, we have the right sensor for your job. If what you need is not available in a standard product, we can design an RTD for your specific application, including temperature sensor assemblies that require connection heads, thermowells and/or transmitters. Contact us!

Quick Links:
General Purpose RTDsWatertight RTD Assemblies
Fixed Sheath RTDs with Connection HeadsSpring-Loaded RTDs with Connection Heads
Fixed Sheath RTDs with Miniature Connection HeadsGeneral Purpose RTDs for Plastic Industries
Adjustable Immersion RTDs for Plastic IndustriesMelt Bolt RTDs for Plastic Industries
Threaded Nozzle RTDs for Plastic IndustriesRing RTDs for Plastic Industries
CIP Sanitary-Connected RTDsRTDs with CIP Sanitary-Connected Wells
Weld-in RTD AssembliesFEP-Coated RTDs
Heat Tracing Temperature SensorsThermostat Temperature Sensors
Hazardous Location Explosion-Proof RTDs

General Purpose RTDs – Single- and Duplex-Element

These RTD elements are designed to measure temperature in a variety of process and laboratory applications. They are specifically designed for use in two different process temperature ranges, and they will provide accurate and repeatable temperature measurement through a broad range.

Low-range RTDs are constructed using Teflon®-insulated, silver-plated copper internal leads with potting compounds to resist moisture penetration.

High-range RTDs are constructed with nickel internal leads inside swaged MgO-insulated cable to allow higher temperature measurements at the RTD element, and to provide higher temperature lead protection along the sheath.

Custom-built assemblies with non-standard specifications are available upon request.

►Technical Information (pdf)

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General Purpose RTDs with Watertight Assemblies

These RTD assemblies house an optional Series 450 temperature transmitter (no connection head required) that is ideal for monitoring temperature in small areas such as tanks and pipes.

Standard units feature watertight construction, a sensor, and an M12 process connection housing, and an optional transmitter. The optional transmitter is a two-wire unit with an analog output.

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Fixed Sheath RTD Assemblies with Connection Heads

General Purpose

Fixed-sheath RTD assemblies with general purpose connection heads are provided with head mounting fittings that are welded or brazed to the sheath for direct immersion into a process. These RTD assemblies are supplied with 316 stainless steel sheaths in several diameters. They are available in various tolerances and temperature ranges.

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Explosion-Proof

Fixed-sheath RTD assemblies with explosion-proof connection heads are provided with head mounting fittings that are welded or brazed to the sheath for direct immersion into a process. These RTD assemblies are supplied with 316 stainless steel sheaths in several diameters. They are available in various tolerances and temperature ranges.

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Spring-Loaded RTD/Thermowell Assemblies with Connection Heads

General Purpose

Spring-loaded RTD/thermowell assemblies with general-purpose connection heads are designed for use with various thermowell types. These sensors are supplied with 316 stainless steel sheaths and are available in various tolerances and temperature ranges.

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Explosion-Proof

Spring-loaded RTD/thermowell assemblies with explosion-proof connection heads are designed for use with various thermowell types. These sensors are supplied with 316 stainless steel sheaths and are available in various tolerances and temperature ranges.

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Fixed Sheath RTD Assemblies with Miniature Connection Heads

Fixed-sheath RTD assemblies with miniature heads are offered with mounting fittings that are welded or brazed to the sheath for direct immersion into a process. The miniature heads offer a compact design and are ideal for laboratory applications or applications where space is limited. The RTD assemblies are supplied with 316 stainless steel sheaths in several diameters. They are offered in various tolerances and temperature ranges.

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Plastic Industry RTDs – General Purpose

These RTDs are most commonly used in the plastic process industry. They can be used in many general applications where a 1/8″ NPT fitting is preferred by utilizing either a compression fitting or a bayonet adapter. These assemblies are supplied standard with 316 stainless steel sheath material and 100 Ω platinum elements. Elements of other materials, values and tolerances are available upon request.

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Plastic Industry RTDs – Spring- or Armor-Adjustable Immersion

The RTD spring-adjustable immersion sensor comes standard with a bayonet cap on an 8″ spring to allow for immersion depths of 1/2″ to 7″. These assemblies are used in a variety of applications, with bayonet adapters, where ease of installation and quick disconnect are preferred.

Technical Information (pdf)

The RTD armor-adjustable immersion sensor has a bayonet cap on the flexible armor and allows for immersion of the entire specified “B” dimension. These assemblies are used in a variety of applications, with bayonet adapters, where ease of installation and quick disconnect are preferred.

Technical Information (pdf)

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Plastic Industry RTDs – Melt-Bolt

Melt-bolt RTD sensors are used on extruders and injection molding machines to directly measure the melt temperature of plastic as it moves down the extruder barrel.

These sensors are made of 300 series stainless steel and are constructed using 100 Ω platinum elements. Elements of other materials, values and tolerances are available upon request.

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Plastic Industry RTDs – Threaded Nozzle

Threaded nozzle RTDs are generally used to measure the temperature of the nozzle of an injection molding machine. This style is not in direct contact with the molten plastic. Due to its relatively small size, it can also be mounted in bearing housings, sealing bars, heat plates, and other limited space applications.

Technical Information (pdf)

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Plastic Industry RTDs – Ring Assembly

Ring-type assemblies have the RTD element embedded into a brass ring.

Various ring sizes are available to measure the surface temperature of nozzles, extruder barrels, die heads, molds, and many other applicable surfaces.

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CIP Sanitary-Connected RTDs

General-purpose CIP sanitary-connected RTD temperature sensors are used in food, dairy, beverage, pharmaceutical, and chemical processing applications where sensor corrosion and product contamination are critical factors. Sanitary caps are welded to the sheath and to a heavier support tube, all made of stainless steel, and then ground and polished to a finish. The process contact surfaces are free of pits, crevices, and pockets, thus preventing corrosion and bacteria growth.

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RTDs with CIP Sanitary-Connected Wells

These RTD sensors are constructed with a CIP sanitary-connected cap thermowell, which is then mounted into the process with a clamp and mating sanitary cap. A 3-wire spring-loaded RTD element and sheath is then screwed into the back of the thermowell. This construction method allows for easy removal of both the well and/or the sensor assembly.

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Weld-in Sanitary RTD Assemblies

Weld-in RTD temperature sensor assemblies are commonly used in the food, dairy, beverage, pharmaceutical, and chemical processing industries. The complete assemblies are provided with a 3-wire platinum RTD element sealed inside a 1/4″ O.D., spring-loaded, stainless steel sheath, and with a heavy-wall sanitary protection well designed to be welded into a tank or vat. The complete assembly provides excellent washdown protection.

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FEP-coated RTDs

FEP (fluorinated ethylene propylene) was originally sold under the brand name Teflon®, among others.

FEP-coated assemblies are designed for a broad range of applications that require resistance to corrosion and chemical attack. They provide very good temperature measurement and service life in plating, pickling, and acid bath applications. The stainless steel sheath is coated with FEP and includes a fused FEP tip for excellent corrosion resistance.

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Heat-Tracing Temperature Sensors

Heat-tracing temperature sensors are used in systems that measure the surface temperature of process pipe that is carrying products whose temperatures must be controlled to prevent freeze-up, or to maintain a viscosity level so that the inner medium will flow.

These sensors are offered with either thermocouple or RTD sensing elements inside 316 stainless steel sheaths, and with 3/4″-radius stainless steel mounting pads. Cold legs are available in customer-specified lengths to accommodate pipe insulation thickness.

►Technical Information – RTD (pdf)

►Technical Information – Thermocouple (pdf)

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Thermostat Temperature Sensors

Thermostat temperature sensors are provided with only the sensor, or with the sensor and a 4-20 mA temperature transmitter, mounted on a subplate within a standard size thermostat housing.

The thermostat housing can be mounted either horizontally or vertically on a 2″ x 4″ electrical handibox. The cover is vented on two sides to provide for airflow over the sensing element, regardless of mounting position.

The standard temperature sensing elements are available as a fluoropolymer insulated thermocouple or a three-wire RTD. Matching transmitters are available for all configurations and output ranges.

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Explosion-Proof RTD Assemblies

Assemblies with Fixed Elements

Explosion-proof, fixed-element RTDs are made for use in U.S. and Canadian hazardous areas.

They are designed to extinguish flames inside the device, eliminating the potential for ignition of flammable mixtures in the surrounding atmosphere. They may be installed directly in the process without being inserted into a thermowell.

The assemblies feature 316 stainless steel sheaths in various sizes. They are available with or without process mountings, and with aluminum or stainless steel explosion-proof connection heads.

►Technical Information (pdf)

Assemblies with Thermowells

Explosion-proof RTD assemblies with thermowells are made for use in U.S. and Canadian hazardous areas.

They are designed to extinguish flames inside the device, eliminating the potential for ignition of flammable mixtures in the surrounding atmosphere. The required thermowell is available in standard, heavy-duty, and flanged constructions.

The assemblies feature 316 stainless steel sheaths. They are available with aluminum or stainless steel explosion-proof connection heads.

►Technical Information (pdf)

Spring-Loaded Assemblies

Explosion-proof, spring-loaded RTDs are made for use in U.S. and Canadian hazardous areas. They are designed to extinguish flames inside the device, eliminating the potential for ignition of flammable mixtures in the surrounding atmosphere.

The assemblies feature 316 stainless steel sheaths. They are available with aluminum or stainless steel explosion-proof connection heads.

►Technical Information (pdf)

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Antech Sales, Inc.
105 Elwood Avenue
Medina NY 14103

585.798.4300
800.836.0754