peter.king@LIGO.ORG - posted 12:47, Thursday 13 October 2016 - last comment - 18:54, Thursday 13 October 2016(30497)
crystal chiller flow rate
Using the crystal chiller that is currently sitting in the mechanical room, the on/off flow rate was recorded as a function of time. The data is that reported via the RS-232 interface. When switched off, the flow rate drops to zero in 3.245 seconds. This seems a lot slower than the drop reported by EPICS, which seems to suggest the flow rate drops to zero in less than a second.
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The difference in times might be a result of different flow impedance - ie -different plumbing and thermal loads connected to the two chillers.