RTD sensor types are commonly distinguished by sensing material, nominal resistance, element construction, and the way the element is wired into the measurement circuit. For an OEM project, the selection should describe both the RTD element and the finished probe, because wiring, sheath, cable, and installation influence the complete measurement system.
Compare common platinum RTD values
Pt100 and Pt1000 refer to platinum RTDs with nominal resistance values of 100 Ω and 1,000 Ω at 0°C, respectively. The controller or converter must be configured for the selected element and its resistance-temperature curve. For legacy drawings citing DIN 43760, review our Pt100 DIN 43760 RTD selection guide for the standards context and OEM specification checklist. Analog Devices’ MAX31865 RTD converter data sheet discusses Pt100/Pt1000 compatibility and illustrates why the RTD, reference circuit, and readout should be considered together.
Choose element construction for the application
RTDs may use different element constructions, such as thin-film or wire-wound designs. Compare the selected element’s current data sheet for operating span, tolerance, stability, vibration suitability, and mechanical constraints; these properties depend on the specific element and assembly. Do not assume that nominal resistance alone determines accuracy or durability.
Specify two-, three-, or four-wire integration
The lead arrangement affects how cable resistance contributes to the measurement. A two-wire circuit is simplest but includes the lead resistance in the measured path; three-wire circuits can compensate when lead resistances are sufficiently matched and the instrumentation supports that method; four-wire circuits separate excitation and sense leads. Select the topology with the converter and cable length in mind, and verify the circuit against the component documentation.
Define the complete RTD probe
Provide the sensing location and medium, probe diameter and insertion length, sheath and tip construction, cable material and length, connector, mounting, and exposure to pressure, moisture, chemicals, or vibration. State the required system accuracy and verification method at the intended operating points. These details let a supplier review the probe and measurement chain as one assembly.
RTD RFQ checklist
- Pt100, Pt1000, or other specified element; tolerance class and curve standard.
- Element construction and required operating conditions.
- Controller input, wiring topology, cable distance, excitation, and calibration plan.
- Probe dimensions, sheath, cable, connector, mounting, and environmental exposure.
- Drawing revision, prototype quantity, validation criteria, and production forecast.
Review RTD probe options
Explore Starlight’s RTD temperature sensor range and see the separate RTD-to-digital converter interface guide for electronics integration. Confirm available configurations against the selected model’s current documentation. For a custom probe, send your drawing and installation requirements for an OEM review.
