Subject: Re: [sloan-25mlog 3802] 2.5m obslog 20171216 (SJD 58104)
From: John Downey
Date: Sun, 17 Dec 2017 07:47:41 -0700
Thanks Kaike, that's perfect.
John
> On Dec 17, 2017, at 7:46 AM, Kaike Pan  wrote:
>=20
> I attached on a =E2=80=9CBAD Pressure=E2=80=9D  note on the dewar. =
-kaike
>=20
>> On Dec 17, 2017, at 7:20 AM, John Downey  =
wrote:
>>=20
>>=20
>>> Notes
>>> =3D =3D =3D
>>>=20
>>> - SP1 LN2 dewar had the pressure of 8 psi. We had to replace
>>> the SP1 180L dewar to be able to do a normal fill. Check back, we
>>> found that the pressure reading was at 7 PSI right after the dewar=20=
>>> was replaced, It would be nice if the pressure is checked when a  =20=
>>> dewar is replaced.=20
>>>=20
>>=20
>> I've sent email around to the day staff about this, explaining that =
it is important to check the pressure because low pressure on the 10l =
can cause a fill fault and camera warm up if not addressed after the =
pressure alert is sent.  In fairness I sometimes forget to check too, =
when I change the dewars.
>>=20
>> When this kind of thing happens, if you could note the dewar number =
that would make it easier to change the pop off.  Usually it's pretty =
easy to find the offending dewar the next day, but noting the number for =
us makes sure it gets done.
>>=20
>> Thanks,
>> John
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>=20