GN2 flow survived the night (but did Kyle, who monitored the screen?). We now have an alarm enabled that will text the vacuum group almost immediately if the GN2 heater trips, in which case relatively cold GN2 would continue to flow through warm CP4, across bibraze joints. Our bake set up is different from the original PSI design, which I don't think was intended to run hot GN2 for days on end.
I increased the regen setpoint to 105C. Gas temp. was pretty steady at ~85C last night, with a setpoint of 95C and prop. gain of 7. There seems to be an offset (~10C) between setpoint and temp reading that I haven't converged on by changing the gain, so for now I increase the setpoint to make up for it. The GN2 flow is ~ 20 scfhx100 and 1/4 of the vaporizer is frosted (see photo). Dewar consumption varies but doesn't look to be more than the typical consumption of normally operating pumps. May need to open up vaporizer feed valve more to allow more flow.
Increased flow of regen GN2 and also temperature. The enclosure heater is outputting 100%; I suspect what is happening is the GN2 is sucking heat inside the enclosure. Because we're measing the temp. of GN2 outside, we should bump it up 10C higher from where we want it at CP4 to compensate for losses. New setpoint is 115C with intension to raise outside gas temp to 105C. Supply air at bake enclosure is at 95C.
The vaporizer feed valve is fully open at 2-1/8 turns, with flow measuring around 40 scfhx100. Not sure we can achieve PSI's 55 scfhx100 spec.