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CT sensor purchase fail?
Posted 15 July 2012 - 07:58 PM
Product link: http://www.ebay.com/...=item1e70195e8e
Posted 15 July 2012 - 10:07 PM
I'll also bet that you are running both current carrying conductors through the sensor. Try just one.
Edited by jpmargis, 15 July 2012 - 10:13 PM.
Posted 15 July 2012 - 11:41 PM
What is the average current that the dryer draws wen running?
Based on that find a CT that is close to that range. The CT is an analog device and will output a voltage/current relative to the current being measured.
Now 1V may be fine if you can detect the difference between on and off. (0V and 0.8V where 0.8V represents that dryier running). If not you need to find a different CT or a black box that will convert the 0-1V to something you can use.
And as stated, you cant put the CT around the cable, the total current flowing will be zero (one core has current flowing one way and the other core has the current flowing the other way, thus zero total). To use a CT you need to split out a core and just run that through the CT.
If you have only 15A total, you can loop it through the CT twice so that the CT will see 30A max and get better resolution. The output will also be doubled, but then you scale it (by half) to get the true value. In your case, you are only interested in on or off so scaling is not an issue.
Posted 16 July 2012 - 01:17 AM
Posted 16 July 2012 - 10:19 AM
Posted 17 July 2012 - 08:02 PM
Edited by iostream212, 17 July 2012 - 08:04 PM.
Posted 18 July 2012 - 02:16 AM
Posted 18 July 2012 - 02:23 AM
Thanks for the update. Back to eBay I go. Take 2.
iostream - I got your PM... but I'd only have one to spare so if you're looking for several, you might be happier finding the one that works for you and getting them all the same.
Posted 18 July 2012 - 09:56 AM
Posted 18 July 2012 - 10:55 AM
There are adjustment screws to get the right levels. The board is basicly an adjustable optamp. I had gone to the trouble of getting everything I needed to make one from scratch, then I found the breakout board. I was a little mift to say the least. I think I'm going to take a different route when monitoring power from now on.
Posted 19 July 2012 - 12:57 AM
He needs a current sensing switch that provides relay closure; the linked product is not a switch but a Current Transformer, so it'll have the same problem as the originally purchased one in that it provides an analog voltage reading only.
Here are the ones I use and they work well for TV's, and my washing machine.
Posted 21 July 2012 - 11:40 AM
Posted 21 July 2012 - 12:09 PM
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