Interpreting Measurement Uncertainty for Temperature PRT probes

M

Mike Boothe

#1
Calibration Uncertainty statements for Temperature PRT probes state a value for a cretain range, example:
±6.3 mK from -40 to 0 °C
±11.5 mK from 0 to 420 °C
±26 mK from 420 to 600 °C
±43 mK from 600 to 661 °C
(0 °C is set at ice point to ±3 mK)

This is stating that the worst case error for the range is the ±xx mK value. Can it be assumed that the worst case error is at the extreeme of the range?

If so then can the range be plotted out vs uncertainty so at a point along the range the uncertainty from the line slope can be used?

Is this an acceptable practice?

Getting back to my example, if I wanted to find the uncertainty at 155 °C (from 0 to 420 °C) the line slope would be at about 6 mK (from 3 to 11.5 mK).
 
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J

jfgunn

#2
I do not think that you can draw the line and interpolate as you suggest. If this were the case, the uncertainty would have been spec'd as a y=mx+b equation.

Based on your example, the uncertarinty at 155C would be +/-11.5mK.

I look forward to other responses.
 

blueicecube2

Involved In Discussions
#3
i agree, interpolation doesn't work here. MU aren't exactly linearly calculated.

as a general rule, when it comes to choosing an MU, choose the worse, max.

safer that way too..

although the best way is to understand the calculation behind it & align you assumptions accordingly to justify your choice
 
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