Potters & Sculptors - Making Rock from Mud
Well this is pretty annoying... Just for laughs I compared a brand new K thermocouple with the one in my kiln. The one in the kiln still has lots of metal fused at the junction so i figured that they would be pretty much the same.
SURPRISE! one read 34.6 mv and the other 36.4mv. So I thought i would try a third as a tie breaker... 33.9 mv. The third one was just a wire probe rather than the beefy kiln probes. but it was a K. type
we're talking about a 300 deg F+ spread at around 1600F ( who knows now what it really is)
I measured in the same kiln with the same meter with all well into the kiln and at equilibrium.
The moral of the story... never trust the absolute accuracy of your controller. don't ever fire without witness cones.