[ 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 [EMAIL PROTECTED]
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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