Quoting William Couture : > 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 rea= l > chart can't be found anywhere... > > Bill They're all real- it's just that there is no international standard =20 for Cu RTDs that I know of. You have not mentioned why you want this- =20 obviously if you are buying the sensor you are going to want to go to =20 the manufacturer for the data. If you are trying to make a general =20 purpose indicator or controller.. you might want to use this (assuming =20 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 > > On Fri, Sep 8, 2017 at 10:15 PM, wrote: > >> Quoting William Couture : >> >> > 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 qui= te >> > 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 o= ver >> from winding the motor, so annealing and exact composition would be >> questionable. >> >> --sp >> >> >> >> >> >> >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > > > -- > Psst... Hey, you... Buddy... Want a kitten? straycatblues.petfinder.or= g > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .