Looking at the data from the various flow sensors, maybe, just maybe, the problem is with the flow sensor attached
to the auxiliary circuit (which monitors flows to the power meters ...). The attached plot seems to imply that the
flow to the power meters dropped before the crystal chiller flow declined.
Would need to check that the power meters are really attached to this part of the cooling circuit because the
diode chiller was running this morning.
For reference the cooling system information is under
https://dcc.ligo.org/DocDB/0067/T1100373/002/LIGO-T1100373-v2%20Coolant%20system%20operating%20and%20maintenance%20manual.pdf
Looking at the data from the various flow sensors, maybe, just maybe, the problem is with the flow sensor attached to the auxiliary circuit (which monitors flows to the power meters ...). The attached plot seems to imply that the flow to the power meters dropped before the crystal chiller flow declined. Would need to check that the power meters are really attached to this part of the cooling circuit because the diode chiller was running this morning. For reference the cooling system information is under https://dcc.ligo.org/DocDB/0067/T1100373/002/LIGO-T1100373-v2%20Coolant%20system%20operating%20and%20maintenance%20manual.pdf