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, <speff@interlog.com> wrote:

> Quoting William Couture <bcouture@gmail.com>:
>
> > Both those charts have different thermal coefficients, and have differe=
nt
> > "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 sens=
or
> interchangeability.
>
> Where exactly did you run into a 50 ohm copper RTD?
>
> --sp
>
> >
> > On Fri, Sep 8, 2017 at 10:15 PM, <speff@interlog.com> wrote:
> >
> >> Quoting William Couture <bcouture@gmail.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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