Date: Tue, 9 Jun 2009 23:06:26 +0000
From: Jon Brinkmann
Subject: Re: 2.5m obslog 20090604 (MJD 54987)
On Fri, Jun 05, 2009 at 12:03:49PM +0000, Elena M wrote:
>
>                        APACHE POINT OBSERVATORY SDSS 2.5M
>
>                                  OBSERVING LOG
>                              Thursday June  4, 2009
>
>                                   (MJD 54987)
...
> *** There was a LN2 leak coming from the red camera on spectrograph 2. We
> received a watcher warning at 08:13Z about the ln2temp and secondary dewer
> pressure. At 09:45Z, we noticed the warning. We checked the camera
> temperatures and issued primary and secondary fills immediately. Camera
> temperatures returned to normal values at 10:58Z. Dan Long was notified and
> came to the site. ***
>
> Note: We did not catch the watcher message because we are used to seeing
> a red value over the camera system (from the spectra mechanicals for
> sp1). However, it is more worrisome why no critical alerts were sent out.
The leak is seen in the murmur log by the watcher:
- at 2009-06-04 20:50:45Z as high LN2 temperature on CCD02
- at 2009-06-05 05:30:26Z as low secondary dewar pressure
The murmur log has no mention of an attempt by the watcher to send e-mail.
Nor does it mention any problem with the watcher server.
There's no indication in the system mail log on sdsshost2 that the watcher
attempted to send a mail message.  The log shows only three messages
sent on sdsshost2 between 2009-06-04 20:00:00 and 2009-06-05 14:00:00.
None were to critical-alerts.  There are no indications of any problem
with any of those emails or with the email software in general.
It appears that, for whatever reason, the watcher didn't send an email.
Jon