From: Geary Eppley (eppley_at_physics.rice.edu)
Date: Wed Feb 12 2003 - 11:34:55 EST
Hi Frank,
Do we want an alarm on the lower limit of freon flow thta notifies us to
turn off HV if we run out of freon or some other gas interuption?
Geary
On Tue, 11 Feb 2003, Frank Geurts wrote:
> Hi Bill --
> I forgot to tell you how the event file will look like.
> It is always single line of numbers in a file that will be updated every
> minute:
>
> 1045013461 61.9 0.15 0.15 0.04 0.04
>
> the first integer number is the unix time stamp. Essentially it counts
> the seconds since January 1st, 1970. Solaris appears to support the same
> standard. Use this number to check whether the file updates at all ...
> it's the least thing that should change after every update. The next
> three floating-point numbers are the gasflow in ccm (cubic centimeter
> per minute) for freon, isobutane and SF6 respectively. No limits or
> alarms apply for those three numbers. The following two floating points
> are the ratios isobutane/freon and SF6/isobutane. The ratios are defined
> in a rather funny way but the bottom line is this:
> - 1.0 good
> - any>1.2 *yellow* alarm -- shiftcrew should make a note in the logbook
> - any>1.6 *red* alarm -- shiftcrew should take action by physically
> shutting down valves and notifying a TOF detector expert.
> - if timestamp does not update: *white* alarm, if persistant call TOF
> detector expert and/or follow procedures to (re-)start gas-monitoring
> software.
> - there are no lower limits that require alarms.
>
> We are not sure about the fluctuations in our readout system so we might
> want to change the limits on yellow and red alarms.
>
> we can look into this tomorrow morning if you want
>
> cheers,
> frank
>
>
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