On Mon, Apr 21, 2008 at 01:20:30PM -0400, Jonathan Dill wrote:
> hobby-boards has nice sensors that measure humidity, temp, and
> optionally light ("solar") in one package.
I'd seen those, and the USB transceiver as well, which is nice.
> Unfortunately, measuring the current and voltage on 240 3-phase is
> probably going to be big ticket item no matter what you do especially
> doing it to code and UL listed, ideally you want PDU with that sort of
> capability built in. Not to mention you will have to hire an
> electrician, have some down time to set it up, and may need permit and
> inspection. To measure current with something like Hall Effect
> ammeter, the phases have to be physically isolated and not in a single
> cable.
Yeah. I'm prepared for that.
> What is the real goal here and how precise does it have to be? Maybe
> there is some way to fudge it or measure empirically. Put a web cam
> on the PDU LCD or outside meter, or photo sensor near warning light,
> or measure DC voltage going to alarm or LED on PDU. Measure magnetic
> field and RF around the feeds or temperature. Noise sensor to detect
> sound from alarm inside PDU. Maybe there is some creative way to meet
> the goal without precise measurement.
Well, it's not PDU; I'm trying to meter the building service, which is
three separate panels with a 200A breaker each, and runs a bit warmer
than I'm comfortable with.
Commercial solutions for this are $5k, which I won't get.
A couple hours of an electrician on a Saturday, to put boxes in front
of the panels to loop the feeders through, to where I can separate
them, and put CTs on them in a box with no exposed HV, yeah.
I'm just a geek, is the answer; I want to monitor *everything*.
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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