Old Cernox approx calibration curve

I have a cryostat with two CERNOX sensors in it, one was apparently disconnected long ago, but I now need to measure the temperature on that stage. None of the calibration curves loaded into my temperature controller work for it, they all read TOVER at room temp. I don't know the serial number, it doesn't appear to be on the package (CU style). The controller has calibration curves for sensors with serial numbers X55408 thru X55411 loaded onto it, so the serial number is probably near that number. The website to download calibration curve data doesn't contain the data for those serial numbers, so I can't just try ones near there. The resistance at room temp (292.32 K according to my other CERNOX sensor) is 45.123 Ohm. I don't need very high accuracy, I'd be happy to know the difference between 50 K and 55 K, so maybe 2 K accuracy would be reasonable if possible.


Aside from doing a calibration myself, can I get 2 K accuracy out of this somehow?