I filled the PSL diode chiller with 350ml of water. Attached is a 30 day plot showing where the diode chilller was filled on Feb 4th, and then the alarm level increasing starting around Feb 13th.
How does this alarm? Is it on Verbal? Audible alarm out in the Diode Room? Or is the red light the only way to tell if it's low. In general, the Crystal Chiller is the one which requires action every week. For the Diode Chiller all we have is the red LED to warn us of low levels (I've never seen it). We (operators) just need to remember to also keep checking the Diode Chiller when performing this task.
Conceivably, we check this every Thursday. If the alarm goes off on Friday, is it OK for this chiller to be in alarm until it's checked the next Thursday?
I wonder if we should include trending the alarm level on the FAMIS procedure for this as Cheryl did.
Unfortunately the red LED on the face of the diode chiller is the only alarm we have and checking this LED is part of the FAMIS procedure. Additionally, especially with Peter and I in Germany until mid-March, if anyone is in the diode room for any reason and sees this red LED lit, fill the diode chiller immediately until the light goes out and post in the alog that water was added and how much. If the water level gets too low, the chiller will shut off, which also shuts off the entire PSL. We need a better alarm (especially in the hypothetical situation Corey brings up, this could result in a laser shut down if not caught before the next scheduled check), but this is what we have for now.