[Halld-controls] Hall D controls meeting on Thursday, June 1st, 2023

[Hovanes Egiyan]

Hi Brian,

thanks for looking into this issue. We will need to think about these.

Hovanes.


________________________________
From: Brian Eng <beng at jlab.org>
Sent: Thursday, June 1, 2023 2:39 PM
To: halld-controls at jlab.org <halld-controls at jlab.org>; Hovanes Egiyan <hovanes at jlab.org>
Cc: njarvis at jlab.org <njarvis at jlab.org>; Naomi Jarvis <nsj at cmu.edu>
Subject: Re: Hall D controls meeting on Thursday, June 1st, 2023

Regarding the Hall B ambient pressure PV: B_SYS_WEATHER_SF_L3_Press

It's currently using a MKS Baratron 1000 torr with 0.5% accuracy (~0.7 kPa) [ ~$1.5k]
Additional sensors from Dwyer have been ordered that are 30 psia with 1% accuracy (~2 kPa) [~$160] to add more pressure locations around the Hall.

That signal is going to a cRIO module that has a 24-bit ADC in high-speed mode 2ms conversion with 80 uV RMS and ~0.5% error.

The cRIO is sampling the sensor at 50 ms and averaging 20 samples to update to EPICS.



For Hall D: There's nothing close to that for the CompactLogix series of PLC modules, the IF8 linked in the agenda is as good as it gets which has a 16-bit ADC (effectively 14bits) and there's no way to disable the filter (only change the rate). End result is around a 1mV/count resolution.

The only thing better for A-B PLCs are some of the high resolution ControlLogix series modules. They have 24-bit ADCs. The Solenoid uses this series of PLC, but the analog input modules it currently uses are just the "regular" 16-bit ADC versions. So it would require getting a new module (1756-IF8I $3619.18) as well as integrating it into the Solenoid PLC system.

As an alternative could assemble something with a microcontroller or Raspberry Pi and a separate ADC module or even just a barometric sensor (can get ones with +/- 3 Pascal accuracy). This would be on the order of a few hundred dollars, depending on number of units.

________________________________
From: Halld-controls <halld-controls-bounces at jlab.org> on behalf of Hovanes Egiyan via Halld-controls <halld-controls at jlab.org>
Sent: Thursday, June 1, 2023 8:13 AM
To: halld-controls at jlab.org <halld-controls at jlab.org>
Cc: njarvis at jlab.org <njarvis at jlab.org>; Naomi Jarvis <nsj at cmu.edu>
Subject: [Halld-controls] Hall D controls meeting on Thursday, June 1st, 2023

Hi,

Let's have a Hall D controls meeting today, Thursday, June 1st at 10:00am. I posted preliminary agenda on the wiki page:

https://halldweb.jlab.org/wiki/index.php/Controls_Meeting_1-Jun-2023

Feel free to add more discussion topics to the agenda.
You will need to use Zoom for Government app to join the meeting. The meeting information is given below.

Best,
    Hovanes




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Topic: Hall D Controls Meeting



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