[Halld-pid-upgrade] sensors

[Frye, John M]

John,

The acceleration sensing hardware I've primarily researched is from Lord Sensing.  The accelerometers we would need would be their G-Link-LXRS nodes:

http://www.microstrain.com/wireless/g-link

To extend the run life of these nodes we'd add a simple battery tray, per Lord's instructions on their website.  This is something I can get more detail on at the appropriate time; doesn't really have an impact on your work now.

To measure temperature and barometric pressure we'd use a Lord TC-Link-1CH-LXRS node:

http://www.microstrain.com/wireless/tc-link-1ch

We'd need to also add a battery tray to this for longer life, plus a fairly standard thermocouple.  

To tie all of the sensors together, Lord recommended their WSDA Base-104-LXRS gateway:

http://www.microstrain.com/wireless/WSDA-BASE

The software to read these instruments is free to download on the Lord website.  

The sales engineers are very helpful at Lord and the website has a lot of useful tools for assisting with system assembly.  As you progress through this if you have questions please let me know. 

-John F.  




-----Original Message-----
From: Shepherd, Matthew 
Sent: Tuesday, April 11, 2017 2:23 PM
To: John Hardin <jmhardin at mit.edu>
Cc: Tom Carstens <carstens at jlab.org>; Timothy Whitlatch <whitey at jlab.org>; Frye, John M <jomfrye at indiana.edu>; halld-pid-upgrade at jlab.org
Subject: sensors


John,

John and I made a brief sketch of what we think are minimal sensor requirements.

Accelerometers, 8 total:  2 each on the
* truck bed
* outer crate
* inner crate
* bar box

These should probably be in the fore and aft positions of each object.


Bar box:

* N2 flow (Tom has this already)
* N2 pressure - this gauge pressure is very low..  Tom has a spec


Crate:

* Pressure and flow for horizontal air spring system
* Pressure and flow for vertical air spring system

For the flow above, we expect it to be zero/small.  Only leaks in the system should generate appreciable flow.  Tom's gauge for the bar box will probably work

The pressures in the air spring system are typically 25 psi.  Something that measures on a scale of 0 - 50 psi would be good.


Trailer environment:

Temperature
Barometric pressure
O2 content (useful to monitor ODH hazard)


Outside environment (necessary?):

Temperature
Barometric pressure


Comments/suggestions?

I think John was going to follow this up with an email to you on some specific models we found.  The key thing is getting something that is easy to interface all together.

Matt

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