RTD Temperature Sensor; Resistance Temperature Detector Pt100, Pt1000

RTD

RTD: Precision Temperature Sensing for Your Projects

A Resistance Temperature Detector (RTD) is an electrical temperature sensor designed for high accuracy, stability, and repeatability. RTDs are built from a pure metal element, most commonly platinum, but also copper or nickel, wound into a coil or deposited as a thin film. As the temperature changes, the element's electrical resistance changes in a predictable way, which the controller converts into a temperature reading.

Like thermistors, RTDs measure temperature through a change in resistance, but with far better linearity and long-term stability. An RTD has a positive temperature coefficient (PTC): as temperature rises, resistance rises almost linearly. This makes RTDs the reference choice for demanding industrial, scientific, and laboratory applications.

Types of RTD

Platinum RTD (Pt100, Pt500, Pt1000): the industry standard, with excellent accuracy, stability, and a wide temperature range. A Pt100 reads 100 Ω at 0 °C.
Copper RTD: low cost and very linear, used in a limited range, for example in motor and transformer windings.
Nickel RTD: high sensitivity and low cost, mainly used in HVAC and building automation.
Wire-wound element: fine wire wound on a ceramic or glass core, offering the highest accuracy and widest range.
Thin-film element: platinum film deposited on a ceramic substrate, compact, vibration resistant, and cost effective.

Wiring Configurations

2-wire: simple and low cost, but lead resistance adds measurement error. Suited to short cable runs.
3-wire: compensates for lead resistance and is the most common choice in industry.
4-wire: eliminates lead resistance error completely, used for laboratory-grade precision.

How to Choose an RTD

Element type and R0 value: Pt100 for general use, Pt1000 for lower self-heating and shorter lead error
Accuracy class: select Class A or AA for precision work, Class B for general monitoring
Temperature range: match the element (wire-wound or thin-film) to the minimum and maximum process temperature
Wiring configuration: 2, 3, or 4-wire depending on cable length and required accuracy
Probe material and sheath: stainless steel or special alloys for corrosive, high-pressure, or hygienic media
Response time: probe diameter and use of a thermowell affect how quickly the sensor reacts
Protection rating and mounting: IP rating, thread size, immersion length, and connection head or connector
Output: direct resistance signal, or a transmitter with 4-20 mA output for long distances and noisy environments

Prices and Technical Support

RTD prices vary by element type, accuracy class, probe construction, temperature range, and brand. For pricing details, expert advice, and our full range of RTD solutions, our team is ready to help you choose the right sensor for your project.

Contact form: contact us
Phone: +9714337738

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