Leading RTD Sensor Manufacturers

RTD devices measure temperature by proportionately changing resistance to temperature. RTD probes comprise an RTD sensing element, a housing or sheath, filler or epoxy, extension leads, and occasionally a connection or termination. There are various sensor materials available. Read More…

RTD Sensors RTD sensors, or resistance temperature detectors, can also be referred to as resistance thermometers as they are used to measure the temperature through a process in which the resistance of the RTD element is correlated with the overall temperature.

In business since 1972, Thermo Sensors Corporation is a leading thermocouple manufacturer of an array of many products and services.

Thermo Sensors Corporation $$$

We manufacture a full line of Thermocouples to fit your application. Temperatures from cryogenic to 4000F, and sizes ranging from needle thin to several thousand pound multipoint temperature sensors.

Thermocouple Technology, LLC $$$

Kelvin Technologies is a high-quality thermocouple manufacturer, representative, and distributor for all of your electrical heating, temperature controlling, and temperature sensing requirements. Our products are engineered and manufactured in-house to address specific requirements, such as higher temperatures and more compact profiles. With over 100 years of combined experience, all of us at...

Kelvin Technologies, Inc. $$$

Temperature Specialists, Incorporated is a manufacturer of quality thermocouples. 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.

Temperature Specialists, Inc. $$$

Since 1971, Thermalogic has been a leading manufacturer of electronic temperature and humidity control and sensors. Here at Thermalogic we work with our clients in a partnership to build a lasting business relationship. All of our products have quick turnaround times, including custom designs, and are thoroughly tested prior to being sent out. At Thermalogic we pride ourselves on our high...

Thermalogic® Corporation $$$

We have over 81 years of successful manufacturing experience and we offer a wide range of solutions. Our thermostats are utilized in industries including HVAC, process heating, food service, laboratory tank heating, industrial system control, and more. We have made it our mission to remain on the forefront of our industry and we work closely with our customers to ensure maximum satisfaction.

Ulanet™ $$$
Get Your Company Listed
placeholder image Thermo Sensors Corporation Thermocouple Technology, LLC Kelvin Technologies, Inc. Temperature Specialists, Inc. Thermalogic® Corporation Ulanet™

As a result, RTD temperature probes and sensors can be used in various applications across numerous sectors. These temperature-sensing devices can function in harsh environments.

Working Principle

The resistance-temperature connection of the metal used in creating RTD sensors is the foundation for its function. The detector is calibrated following the measurement of the change in resistance value that results from each degree increase in temperature.


Because resistive elements are brittle, insulation is usually necessary. Therefore, the element is linked to insulator leads. PVC is used with insulators, such as molds, for temperatures under 250oC. As an outer covering, a metal alloy unreactive to temperature is utilized to house the Leads and measuring device. The temperature gradient of the sensor is the range from 0°C to a temperature margin in which the change is linear. The type of cable the sensor uses will determine this. The temperature range for platinum is up to 6600C, while the range for nickel is up to 3000C.

Types of RTD Sensors


Wire-wound RTD sensors wrap around an insulating ring or spindle. Wire-wound RTD sensors use wires made from copper, iron, and platinum. The greatest resistance-temperature relationship is provided by platinum; however, platinum wires are expensive. In addition, the expansion allowance that wire-wound elements provide makes them valuable.

A Wire Wound

Carbon Resistor

Carbon resistors are very affordable. They should only be used in applications requiring very low temperatures.

 A Carbon Resistor

Thin Film RTD

Thin film RTDs are a light coating of platinum film deposited onto a substrate. The design etched into the RTD element creates an electrical circuit. Platinum Slim RTDs maintain accuracy across a broad temperature range and have a near-linear resistance vs. temperature relationship. As a result, the platinum RTDs benchmark is considered the European benchmark DIN/IEC 60751.

A Thin Film RTD Resistance Circuit


Strain-free RTDs also use wire coils, but this wire is wound around over a sealed housing with inert gas rather than glass or ceramic. To allow the element to expand and contract easily in response to temperature changes, they only employ platinum wire that must be loosely wound. This element type's primary drawback is it is poorly supported and consequently prone to shock and vibration.

A stain-free RTD sensor

Considerations When Choosing RTD

Manufacturers often offer RTD sensors attached to insulated leads if they are designed to be submerged in cold temperatures. Silicone rubber, polyvinyl chloride, or PTFE (polytetrafluoroethylene) often create these insulated lines. Additionally, producers frequently encase light sensors in shielding, unreactive metal alloy sleeves. When choosing housings or sheaths, remember they must protect the sensors from external damage (like chemical toxins, wind, rain, and other variables).

Measuring Range:

RTDs could detect temperatures of up to 1000°C. However, it’s challenging to obtain precise readings at temperatures higher than 400°C. TCs can measure up to 1700°C. The recognized rule is: for precision, use an RTD for temperatures below 850°C; for temperatures beyond 850°C, use a TC. An RTD is best for the average industrial temperature range from 200°C to 400°C.

Choosing the Proper RTD Sensor Manufacturer

To make sure you have the most productive outcome when purchasing RTD sensors from an RTD sensor manufacturer, it is important to compare at least 4 manufacturers using our RTD sensor directory. Each RTD sensor manufacturer has a business profile page that highlights their areas of experience and capabilities and a contact form to directly communicate with the manufacturer for more information or request a quote. Review each RTD sensor business website using our proprietary website previewer to get an idea of what each business specializes in, and then use our simple RFQ form to contact multiple RTD sensor businesses with the same quote.

RTD Sensors Informational Video


Thermocouples Power Pages

RTD Sensors

RTD Sensors

An RTD, resistance temperature detector, is a passive temperature sensing device that operates on the principle that the resistance of a metal changes as the temperature changes. The electrical current that passes through the element...

Temperature Sensors

Temperature Sensors

Temperature sensors are devices that detect and measure coolness and hotness and convert it into an electrical signal. Temperature sensors are utilized in our daily lives, be it in the form of domestic water heaters...



A thermistor, a shortened version of the term thermal resistor, is a passive component whose resistance changes as the temperature in a system changes. Thus they serve as an inexpensive, accurate, and dynamic method for measuring temperature...



A thermocouple is a transducer that converts thermal energy into electrical energy and is constructed by joining wires made from dissimilar metals to form a junction. Voltage is produced when the temperature at the junction changes...



A thermowell is a pressure-tight vessel that safeguards and increases the lifespan of temperature sensors in processing plants in cases where a measuring sensor is not otherwise mechanically or chemically useful in...

Cartridge Heater

Cartridge Heater

A cartridge heater is a cylindrical tubular heating device that provides concise and precise heating for various forms of materials, machinery, and equipment. Unlike an immersion heater, a cartridge heater is inserted into a hole in the item to be heated to furnish internal radiant heat...

Heating Element

Heating Element

A heating element is a material or device that directly converts electrical energy into heat or thermal energy through a principle known as Joule heating. Joule heating is the phenomenon where a conductor generates...

Electric Heaters

Electric Heaters

Electric heating is produced by using a known resistance in an electric circuit. This placed resistance has very few free electrons in it so it does not conduct electric current easily through it. When there is resistance in...

Infrared Heating

Infrared Heating

Infrared heating is a heating method used to warm surrounding bodies by infrared radiation. Thermal energy is transferred directly to a body with a lower temperature through electromagnetic waves in the infrared region...

Test and Measurement Equipment
Featured Industries