[Dsg-rich] redundant humidity sensors wired to cRIO

[Amrit Yegneswaran]

tyler, thanks for the news. 

hello all, 
the heat transfer coeff (HTC) depends on air velocity (movement of air over the FPGAs.) 
i think there are 6 exhaust lines for the EP panel. 
if only 2 were open air velocity would be 3 times faster and the FPGAs temps should drop. 
should be easy to check. 

ideally, one would increase the mass flow of air of the FPGAs. 
if each of the stainless steel tubes had ~ 48 holes of 4mm diameter, the mass flow (2 tubes) would increase 16 fold, the FPGA temps would drop to about 40c. 

one need not be concerned about the exit velocity from the orifices, which due to the pressure diff is in the realm of throttled flow, therefore air would exit at 340m/s. 

marc has two extra stainless steel tubes, might be worth a whirl. 



From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Monday, December 4, 2017 5:04:04 PM 
Subject: Re: [Dsg-rich] redundant humidity sensors wired to cRIO 

Hello, 

Also, the Hardware Interlock LabVIEW program has been updated with the correct calibration constants. 

Best regards, 
Tyler 


From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Monday, December 4, 2017 5:00:23 PM 
Subject: [Dsg-rich] redundant humidity sensors wired to cRIO 

Hello, 

At Marco's request, all humidity sensors for the electronic panel have been removed and the redundant sensors for the nitrogen volume wired to the cRIO in their place. 

Until this afternoon, the redundant sensors at each location were not read. 

The table below shows the nitrogen volume sensors (#9- #15) and which humidity sensors numbers correspond to the newly wired redundant sensors on the sensors boards (#1 - #8). 

Humidity # 
	Redundant Sensor Humidity #: 

9 	1 

10 
	3 

11 
	4 

12 
	5 

13 
	6 

14 
	7 

15 
	8 


Best regards, 
Tyler 

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