[dsg-hallb_rich] RICH interlocks network restored - but S4 gas monitoring lost

[Valery Kubarovsky]

Hy Tyler,
The RICH compressor is OFF. So the air flow is zero.

Sector 4 nitrogen flow is OK, 39.45 right now.
Sector 1 nitrogen flow is zero.
Sector 4 humidity is still 0.00.

Sector 4 LV and HV status : enables, has to be disabled.
Regards,
Valery

________________________________
From: Tyler Lemon <tlemon at jlab.org>
Sent: Friday, December 19, 2025 14:05
To: Valery Kubarovsky <vpk at jlab.org>
Cc: tlemon--- via dsg-hallb_rich <dsg-hallb_rich at jlab.org>
Subject: RICH interlocks network restored - but S4 gas monitoring lost

Hi Valery,

Nathan replaced the network switch that RICH interlock systems use and I've rebooted the cRIOs.
Both systems came back up and are now accessible over the network.

But, it unfortunately looks like there yet another problem with the instrumentation reading out RICH S4 air flows and nitrogen flows as they are all showing zero again.
I verified in the hall at the gas panel that the S4 is still getting N2 flow and we can see the humidity data remotely now.

The typical solution is to swap the peripheral controller responsible for reading those sensors for a spare.
I have spares on hand, but it'll take some time to configure it for RICH and install it in the hall.

So, since the detector is off for the accelerator shutdown and we know the detector still has N2 flow and will be okay over the weekend, my plan is to spend this afternoon preparing and then perform the swap Monday morning (12/22).

-Tyler












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