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Temperature sensor selection Cheat Sheet (DRAFT) by [deleted]

Temperature sensor selection

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Introd­uction

To optimize measur­ement perfor­mance and minimize long-term mainte­nance expenses, use the following tips as a practical guide for temper­ature sensor selection.

Tips

1. Use an RTD when measuring in ranges between -40° and 850°C (-40° and 1,562°F)
2. For temper­atures as low as -200°C (-328°F), use a wire wound RTD
3. Best practice is to use 4-wire and Class A RTDs
4. Make sure the sensors are temper­ature cycled and “aged” for long term stability
5. When applying RTDs below 0° and above 600°C, you want to know the process conditions in order to optimize the build: Temper­ature range, cycling, pressure, flow, media, vibration and surrou­nding enviro­nmental conditions (chemi­cal­s/a­tmo­sphere)
6. When highest accuracy is needed, use sensor trimming.
7. If using 3-wire RTDs with long wire runs, and you cannot convert over to 4-wire RTDs, replace the 3-wire RTDs with 1000Ω Platinum RTDs
8. If monitoring temper­atures above 850°C (1562°F), use thermo­couples
9. If using thermo­cou­ples, use premium grade thermo­couples and extension wire
10. If using long thermo­couple extension wire, be sure it is noise protected
11. Replace contam­inated TC extension wire with remote I/O