Electronics > Metrology

Questions on pt100 probes

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mendip_discovery:
Too many variables with the boiling water technique.

What I have is a dry block calibrator and that is fairly good at holding temperature. But I use a master probe that is known and I can use that for the temperature. Expect me to revise this over the next year or so as I delve into the world of temperature.

ap:
Building a gallium cell may also be an option for you...

BarrowBoy:

--- Quote from: ap on July 13, 2024, 02:30:15 pm ---Building a gallium cell may also be an option for you...

--- End quote ---

Unlikely..lol. Nice website BTW.


--- Quote from: Yuu on July 12, 2024, 06:26:17 pm ---
--- Quote from: BarrowBoy on July 09, 2024, 11:42:24 pm ---If range is 0-100C, then any reason a Thermistor is not being used? They have a far greater value change across their working range and are very good in this temperature range IMO. Below is something I found online which is a good summary of why I ask.

--- End quote ---

No reason in particular. The pt100 stuff is just what I stumbled into learning about atm.
For my temp range, could a thermistor be more accurate? (yes I know an RTD is a type of thermistor technically but it's my understanding that thermistors in this context are typically semiconductor material with a negative temperature coefficient)
If so, any recommendations for like a stainless-steal-sheath probe preferably under $100?

I'm willing to bet, for this temp range, accuracy of thermistors and pt100 probes are comparable and it more primarily depends on how much you're willing to spend.
Like I think Fluke sells both types of probes with pretty darn good accuracy but they're expensive lol.

--- End quote ---

It's actually a recommendation I was given by Fluke. Well not really Fluke, more their division based in Salt Lake City, formally known as Hart Scientific. Bang for Buck, it's a Thermistor solution. But over over 100C, or below TPW, and you need RTDS.  Here is a link for their premium Thermistor probes. Note the text at the foot of page. Also often thermistors are preferred due to their rate of change over the 0-100C span, but they can by design  a small sensor, with very fast settling time / stability, and very little stem convection, which improves accuracy when measuring and ease for calibration.

https://www.fluke.com/en/product/calibration-tools/temperature-calibrators/fluke-hart-secondary-thermistor-probes

Also this article may help, differs a bit from my advice on range, it notes (-80C thru +150C) which is news to me, but hey were here to learn ;)

https://www.analog.com/en/resources/analog-dialogue/articles/thermistor-temperature-sensing-system-part-1.html

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