John, Chandra

Spent almost all morning troubleshooting thermocouples at CP3 exhaust. Wires needed to be swapped at both the Beckhoff rack and also at the well terminal. Now temps are believable. Exhaust reads ~ 18C which is still a little high, but better than 30C. Reading is -176C when dunked in LN2 and around 28 C pinched between fingers.

Note for future:  at terminal well the yellow wire goes on + side and all connecting wire colors should match. At Beckhoff terminal we found yellow on top, which was backward in the case for both TCs at CP3 (may not be the case for all racks). Test with LN2 and body heat because sometimes when temp. reads normal it actually trends the opposite way with a heat source/sink when wires are backward.