Environmental monitoring

[Jay R. Ashworth]

[ inadvertantly didn't send these to the list ]

On Mon, Apr 21, 2008 at 11:29:45AM -0400, Jonathan Dill wrote:
> On Apr 21, 2008, at 10:33 AM, Jay R. Ashworth wrote:
> >Aha!
> >Thanks.  It ain't wireless, but at the price, I also don't care.  :-)
> 
> Also, it's all cabled together with inexpensive satin cable and RJ11  
> plugs, probably more reliable to use a powered hub though if you have  
> more than a few sensors, but you can always try that later if you have  
> problems.  You do have to be careful which pin goes to ground or + it  
> probably won't damage anything but the device will not be seen if you  
> cross the wires.  Cheap "biscuit" phone jack can be useful for testing  
> and troubleshooting, that makes it easy to switch + and ground if you  
> think that may be the problem.  Finally, a use for all of that Mac  
> PhoneNet / Gator / serial Terminal Server junk that you never quite  
> got around to throw away, lol.

Quite so.

So my current list of things I want to monitor (and will have to find
sensors for) is 

  Machine room temp (5 racks, plus probably 4 other locations and AC
    outlet temps)
  Machine room humidity
  Power panel temp (3 panels)
  Current and voltage per leg (240 3-phase, closed delta)

The temp and humidity are walk-ons.  Power panel temps are a bit
harder, but I saw thermocouple temp sensors.  The power and voltage,
now... that's going to be dicey.  I can get voltage off a receptacle
installed for the purpose, or in a box downstream of a breaker, but the
current I have to pull right off the feed wires, and I'm playing hell
finding UL rated AC current sensors that will measure 200A RMS AC, much
less ones that are 1-wire...

Cheers,
-- jra
-- 
Jay R. Ashworth                   Baylink                      jra at baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates     http://baylink.pitas.com                     '87 e24
St Petersburg FL USA      http://photo.imageinc.us             +1 727 647 1274

	     Those who cast the vote decide nothing.
	     Those who count the vote decide everything.
	       -- (Joseph Stalin)

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