06192018Tue
Last updateMon, 19 Mar 2018 5am

Reasons to Consider Using a 1000 ohm Platinum RTD

Technical Note by Moore Industries: When higher resolution is required, measuring circuits can benefit from the larger signal stren1000 ohm Platinum RTD.jpggth inherent to the 1000 ohm sensor available in Moore Industries products such as the WORM Flexible Temperature Sensor. This benefit can be seen in greater accuracy when used for smaller minimum measurement spans. Each point of measurement has 10 times more resistance along with a greater change in resistance per degree.

If your application involves wiring long distances from the RTD to the measuring device and you do not have a 4-wire RTD measuring circuit, you can benefit greatly by using the 1000 ohm sensor. The error caused by the wire resistance is dramatically reduced.  Assume your measuring device is measuring RTD + Wire. The Wire resistance is the same whether the RTD is 100 ohm or 1000 ohms. But when you compare (100 + Wire) to (1000 + Wire), the error caused by the Wire is roughly ten times less when using the 1000 ohm RTD.  When making a 3-wire RTD measurement with long wire runs, use the 1000 ohm to reduce your error.

Additional Resources and Recommended Readings by Moore Industries: SELECTION GUIDE: Temperature Sensors, Transmitters and Assemblies