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Posted by Epictitus on February 28, 2007, 7:20 pm
 
Google

"current transformer"

split cores make life easier




Posted by BobG on February 28, 2007, 7:49 pm
 
Look up TED The Energy Detective... sniffs ea breaker in the box with
a hall sensor... gives kWhrs used, cost, estimated bill at current
rate, LCD screen.


Posted by Epictitus on March 1, 2007, 3:26 pm
 Cool idea but he already has a data logger and you can get CT's at
electronics surplus stores cheap cheap.

BTW, TED uses CT's clipped on the mains, not hall effect sensors
http://www.theenergydetective.com/pdfs/FusePanel_Installation.pdf



Posted by Duane C. Johnson on February 28, 2007, 8:32 pm
 Hi Burlington;


 > Just got myself a data logger. This is an 8 channel
 > unit which records data from a variety of sources,
 > but what I'm trying to do is download household
 > electricity, gas and water consumption with a view
 > to recognizing waste. My aim is eventually to use
 > it in a commercial operation.

 > The gas and water metering is up and running. Both
 > the meters put out a pulse which is translated into
 > a volume. It's already amazed me how wasteful we
 > are at certain times.

 > Electricity is harder, as I persuaded my utility
 > company to install a new meter with a pulsed output,
 > but it's not an electrical signal as I'd hoped but
 > a flashing light. Every flash is 1/10th of a KWH. I
 > need to build a device which responds to the flashes
 > and converts into an electrical signal.

 > A photo transistor comes to mind but I've no idea
 > how to do this. Can anybody help?

Try this one I designed. In this case I am using a
conventional LED as a photo detector.

http://www.redrok.com/misc1.htm#pulsephotodetector

Duane

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Posted by _jj_ on March 1, 2007, 4:45 am
 
This company has a device to watch your meter ...

http://www.bluelineinnovations.com/powercostmonitor.php



On 28 Feb 2007 07:13:59 -0800, "Burlington Bertie"



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