Environmental monitoring

[Jay R. Ashworth]

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                      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)

-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference 
Don't miss this year's exciting event. There's still time to save $100. 
Use priority code J8TL2D2. 
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null