[Dsg-rich] Interlock sensors

[Tyler Lemon]

Hello Marco, 

Thank you for sending the interlock cable information. 

For the feedthroughs for the new cable bundles mentioned today for the nitrogen body, we have already submitted the PR. 

However, we will need more: 
1.) four-wire RTD cable and three-wire humidity sensor cable - Once ordered, it will take about one week to be delivered at JLab. 
2.) temperature and humidity sensors. - We should have enough humidity and temperature sensors. However, we will need to verify the amounts we have on hand. 
3.) PCBs to mount sensors. - If we cannot easily order or find more PCBs to mount the sensors, we can find alternative boards to epoxy the sensors too. 

You mentioned the cable lengths from relevant locations to the 15-pin feedthrough could be customized. Could you send us these cable lengths so Mindy can begin to fabricate the cables as soon as we receive the components? 

Best regards, 
Tyler 




From: "Marco Contalbrigo" <mcontalb at fe.infn.it> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Friday, October 13, 2017 11:07:16 AM 
Subject: Interlock sensors 

Dear Tyler, 
as anticipated at the meeting, here is the list of 
sensors we have in mind. 

Each PCB station mounts 2 temperature (T) and 2 
humidity (H) sensors. I would suggest we cable 
all of them but connect only one H+T pair per 
station to the cRio, while keeping the second 
as spare. Should a sensor have a problem, we 
would need an access to exchange it with his 
spare at the cRio. 

One option could be to have 4 cables in the 
short (internal RICH) section and only 2 in the 
outer (Hall) section. This implies however to 
access the connectors at the RICH position to 
be able to exchange the sensors. 

----------------- 
Electronic Panel (EPanel) 
----------------- 
Short section: from EPanel to patch panels 
Lenght as the average of the power supply 
cables: 6 m. 

Long section: from patch panel to cRio 
patch panel A: 50 feet 
patch panel B: 65 feet 

Priority is cooling monitor, electronic healty 
and FTOF heat load control. The mimimum would 
be 6: 

1 for inlet 
1 for outlet 
2 on the electronics 
1 outside the cover 
1 on the FTOF 

It is clear to have at leat 2 more (for a total 
of 8) would be worth, to have a better control 
of possible hot spots. 

------------------- 
N2 volume 
------------------- 
Short section: internal to the N2 volume, from 
relevant locations to the 15-pin feedthrough 
Lengths can be customized (see below). 

Long section: from feed-through to the cRio. 
Lenghts as for the patch panels. 

We do not need to pass by the patch panels. 
Priority is to monitor the inner volume and 
control the aerogel. The minimum would be 6: 

2 for inlet (3.5 m) 
2 on the aerogel (4 m) 
1 for outlet (1 m) 
1 close to the EPanel (5 m) 

Again, to have 2 more could be wise. 

All together, the number would be 6+6=12 stations 
(one sensor per type connected) as minimum, with 
8+8=16 as optimum, given the cRIO capability. 

On top of all, we should not forget to calibrate 
the sensors before installation. 

As anticipated, Luca Barion from INFN-FE is 
supposed to stay at JLab in one week from now. 
He could join the effort of sensor cabling 
and calibration if this helps. 

Thanks, Marco. 

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