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'[EE] CU-50 RTD resistance chart?'
2017\09\08@215441 by William Couture

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Or possibly [OT] -- maybe I'm searching with the correct terms, but I'm
trying to find
an resistance chart for a CU-50 RTD probe.

The best I've been able to come up with is this image, which isn't quite
readable:

https://is.alicdn.com/img/pb/747/046/531/531046747_904.jpg

Pointers to something better?

Thanks!
  Bill

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2017\09\08@221513 by speff

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Quoting William Couture <spam_OUTbcoutureTakeThisOuTspamgmail.com>:

> Or possibly [OT] -- maybe I'm searching with the correct terms, but I'm
> trying to find
> an resistance chart for a CU-50 RTD probe.
>
> The best I've been able to come up with is this image, which isn't quite
> readable:
>
> https://is.alicdn.com/img/pb/747/046/531/531046747_904.jpg
>
> Pointers to something better?
>
> Thanks!
>    Bill
>

http://www.thermometricscorp.com/PDFs/10_ohm_copper_rtd-0.00427_in_C.PDF

Multiply numbers by 5.

OR

http://www.thermometricscorp.com/images/Accessories/thermometricscorp_2129_12162627.gif

Halve these numbers.

depending on whether it's 50R at 0 degrees C or at 25 degrees C.

There may be others based on 75F or something.

Copper RTDs are all over place in terms of the quoted resistance (and  therefore the tempco) when you get down to the last decimal place or  two, AFAIK there is no standard.

One of the main applications would be homemade with a bit of wire left over
from winding the motor, so annealing and exact composition would be  questionable.

--sp







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2017\09\09@113410 by William Couture

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Both those charts have different thermal coefficients, and have different
"zero" scales -- the 10R is 10R at 25C, the 100R is 100R at 0C.

the 10R chart multiplied by 5.5356 is closer, but it's strange that a real
chart can't be found anywhere...

Bill

On Fri, Sep 8, 2017 at 10:15 PM, <.....speffKILLspamspam@spam@interlog.com> wrote:

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2017\09\09@152603 by Alan

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Bill,
Your link to
is.alicdn.com/img/pb/747/046/531/531046747_904.jpg
Leads me to a chart that while a bit fuzzy seems to be readable on my little iPad. For instance the device is 50 Ohm at 0c, 71.400 Ohm at 50c and 82.134 Ohm at 150c

The link someone sent for the 100 Ohm probe at www.thermometricscorp.com/images/Accessories/thermometricscorp_2129_12162627.gif
Shows 100 Ohm at 0c, 142.108 at 100c, and 163.168 at 150c
Almost but not quite exactly 2x the 50 Ohm probe.

I would suggest that you figure out why you can't read your chart but if you can't figure it out, I could send you a screen shot from my iPad


Looking forward,
Al Shinn (Tinker)

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2017\09\09@171927 by Alan

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Errata!
Oops that value of 71.400 Ohm is for 100c, not 50c! So sorry.

Looking forward,
Al Shinn (Tinker)


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2017\09\09@184154 by speff

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Quoting William Couture <EraseMEbcouturespam_OUTspamTakeThisOuTgmail.com>:

> Both those charts have different thermal coefficients, and have different
> "zero" scales -- the 10R is 10R at 25C, the 100R is 100R at 0C.
>
> the 10R chart multiplied by 5.5356 is closer, but it's strange that a real
> chart can't be found anywhere...
>
> Bill

They're all real- it's just that there is no international standard  for Cu RTDs that I know of. You have not mentioned why you want this-  obviously if you are buying the sensor you are going to want to go to  the manufacturer for the data. If you are trying to make a general  purpose indicator or controller.. you might want to use this (assuming  the reference temperature of 25 C is appropriate..)

http://www.pyromation.com/Downloads/Data/427_c.pdf

Again, scale the numbers appropriately (5:1 in this case). Anything that's
within a degree or two C at the extremes is probably better than the sensor
interchangeability.

Where exactly did you run into a 50 ohm copper RTD?

--sp

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2017\09\09@201945 by Alan

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More than you wanna know about copper resistance with temperature:
nvlpubs.nist.gov/nistpubs/bulletin/07/nbsbulletinv7n1p71_A2b.pdf
Looking forward,
Al Shinn (Tinker)


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2017\09\11@135456 by William Couture

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I ran into this sensor when I bought a cheap Chinese controller -- it came
with one.

I write software for industrial process controllers professionally, and
occasionally buy
one of the cheap controllers I see around (aliexpress, ebay) just to see
how they are
built and how capable they are.

I'd never heard of a CU-50 RTD, and couldn't find anything except the one
image I
linked to.

I though one of you might provide more insight.

Bill

On Sat, Sep 9, 2017 at 6:41 PM, <spamBeGonespeffspamBeGonespaminterlog.com> wrote:

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2017\09\11@135825 by William Couture

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Alan,

I can read MOST of the table, but some value like 59C (62.6??)   (62.628??)
are guesswork.  I was hoping that there
was a better table available somewhere.

Bill

On Sat, Sep 9, 2017 at 3:25 PM, Alan <EraseMEalshinnspammindspring.com> wrote:

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2017\09\11@141124 by Sean Breheny

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I've never heard of a Copper RTD. While Copper has quite a high tempco of
resistance, I think it is much more difficult to get a very accurate value
for it than it is for Platinum so most metal-based RTDs use Platinum.

On Mon, Sep 11, 2017 at 1:54 PM, William Couture <RemoveMEbcoutureEraseMEspamEraseMEgmail.com> wrote:

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2017\09\11@155234 by William Couture

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I had not heard of them, either.  But I'm willing to bet copper is much
cheaper
than platinum, so the copper RTD gets used.

Bill

On Mon, Sep 11, 2017 at 2:11 PM, Sean Breheny <shb7STOPspamspamspam_OUTcornell.edu> wrote:

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