[Dsg-rich] [Rich] rich air flow

[Valery Kubarovsky]

Hi All, 
I got several calls yesterday evening and today night from CLAS12 shift about AIRPR1 alarm (currently minimum set to 35). See attached plot. I changed this limit to 30 for a moment. The plot looks not normal before Oct.13 18:40 in my view. 
Regards, 
Valery 

> From: "Tyler Lemon" <tlemon at jlab.org>
> To: "Marco Mirazita" <Marco.Mirazita at lnf.infn.it>
> Cc: rich at jlab.org, "dsg-rich" <dsg-rich at jlab.org>
> Sent: Friday, October 12, 2018 9:25:18 AM
> Subject: Re: [Rich] [Dsg-rich] rich air flow

> Hello,

> Enough time has passed since I reset the cRIO's averaging to be able to tell
> that the averaging is not the cause of the odd airflow and pressure signals.

> Attached are archiver plots, one from today, and one from July when averaging
> had to be reset.

> The one from July shows the signal returning to normal soon after resetting the
> averaging. The signal from today does not show the same behavior.

> It seems the most likely cause is the drop in ambient pressure.

> Best regards,
> Tyler

> From: "Tyler Lemon" <tlemon at jlab.org>
> To: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>
> Cc: rich at jlab.org, "dsg-rich" <dsg-rich at jlab.org>
> Sent: Friday, October 12, 2018 8:16:43 AM
> Subject: Re: [Rich] [Dsg-rich] rich air flow

> Hello Marco and Valery,

> From the past behavior of the cooling system, we know that the airflows follow
> the pressure in the cooling system's buffer tank. The attached "RICH airflows
> and pressure 2018-10-12.JPG" shows this.

> It also looks like the buffer tank's pressure follows the ambient pressure in
> the hall (attached RICH pressure and Ambient pressure.JPG; NOTE units for the
> two pressures are not the same. RICH's is in psi, the ambient is in
> inches-water-column). This could be the cause of the ~10 slm decrease in
> airflow.

> Also, in the past, we have seen issues where the signal averaging in the
> interlock LabVIEW program needs to be reset. To make sure this wasn't the cause
> of the odd flow and pressure readings, I reset the averaging on the LabVIEW
> User Interface at about 8:06AM. If it turns out the averaging was the cause of
> the odd signals, we will either disable the averaging until a solution is found
> or put in logic that will automatically reset the averaging every week or so.

> To make sure that there isn't some other issue with the compressor, we will look
> into a way to remotely access the status of the compressor in case we are
> missing some sort of warning on it that would explain the behavior. This most
> likely be setting up the compressor's web interface. Setting up the web
> interface has not been done yet because collaborators expressed concern about
> putting an accessible way for someone to accidentally turn the compressor off.

> In the mean time, we will continue monitoring.

> Best regards,
> Tyler

> From: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>
> To: "dsg-rich" <dsg-rich at jlab.org>, rich at jlab.org
> Sent: Friday, October 12, 2018 4:32:35 AM
> Subject: [Dsg-rich] rich air flow

> Hi all,
> I noticed that in the last couple of days the air flow on the two lines
> feeding the RICH went down by approximately 10%.
> At the same time, the FPGA temperatures slightly increased.
> Then at some time tonight the air flow started to go up again.
> While no real problem has been encountered (tile 128 is the hottest one
> and never went above 68 deg) it would be interesting to understand why
> this happened.
> See the attached strip charts.
> Best regards,
> Marco

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