Trended LVEA pressure gauge readings over 60 days. We have seen a trend upward in the two new hot cathode ion gauges PT 170 & PT 180 on BSC 7 & 8. Last Tuesday we degassed both to see if that helps stabilize the readings (cold cathode gauges, PT 120B, 114B, 134B, readings in corner are either flat or trend down!). 

PT 140 is the one and only gauge measuring diagonal volume, and is also a new hot cathode ion gauge. It was reading pretty flat, until Oct. 10th when the temperature in LVEA was increased at 2B area (west corner) by around 1/2 degF.

PT110 is a new hot cathode gauge on HAM 6.