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RE: [TCML] Smoke Detector Issues




I've been kind of waiting to see if someone else would mention this but I wonder  if the NOs, O3, or possibly particulate matter from the SG could possibly cause the smoke detector to sound off? Of course I suppose that wouldn't answer the neighbor's detector issue....?

David Rieben
------------------------------
On Mon, Jan 30, 2012 12:03 PM CST John Paul Gripp wrote:

>The smoke detectors detect both smoke and carbon monoxide and  are hardwired
>with battery backup.  Since they are hard wired, when one goes off, it
>triggers all of them to go off.  I have tried covering them with foil and
>even temporarily removing it from the room where I run coil.  It will
>eventually set off detectors in a nearby room and my neighbor's house.  
>
>Currently, my VTTC has all common grounds through an EMI/RFI Filter to house
>mains.  I have also tried using an RF ground to a water pipe while filtering
>all other grounds to mains.  Neither made any difference with the smoke
>detectors.   
>
>Although I was trying to avoid it, I am thinking some sort of Faraday Cage
>may be my best option for running this inside.  We will see if it makes any
>difference.  
>
>Thank you all for your help!
>
>JP
>
>
>-----Original Message-----
>From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
>Of Derek, Extreme Electronics
>Sent: Sunday, January 29, 2012 7:42 PM
>To: Tesla Coil Mailing List
>Subject: Re: [TCML] Smoke Detector Issues
>
>Jim,
>If it is a smoke detector that looks for ionised particles, Tesla coils will
>set them off..  Its does exactly what it should when presented with a large
>TC generated cloud of ionised particles.
>
>I haven't found a cure for this other than wrapping them in tin foil whilst
>the coil is in use. Of course the tin foil could be protecting the
>electronics from EMF.. All I can say is it works.
>
>Please remember though, this does render the smoke detector useless at
>detecting smoke, you must remove the foil after the tesla coil use.
>
>     Derek
>
>On 29/01/2012 20:10, Jim Lux wrote:
> On 1/28/12 11:47 PM, John Paul Gripp wrote:
> Hello All,
>
>
>
> I have been having a problem with my smoke detectors going off every 
> time I run my SGTC or VTTC.  I am assuming it is EMI/RFI that is 
> causing it.  It would not be so bad, except that I live in a townhome 
> and it tends to set the smoke detectors off at my neighbors place as 
> well.  Has anyone ever dealt with this before?  Anyone have any clue 
> what I could do to prevent it?
> I wouldn't want to have to chose between moving and coiling!
>
>
>
>
> What are your sparks arcing to, and what is the return path for the 
> current to the coil?  You might be inadvertently setting up a good 
> "transmitter" with a big loop.
>
> What I would NOT do is try to engage in a EMI filtering campaign with 
> the detectors.   You might, though want to see if you can get one of 
> the detectors (same brand and model) and hook it up as a test fixture.
>
> You want to know whether the EMI is getting into the detectors via 
> conduction (e.g. power lines from your coil) or radiation (the power 
> lines for the detectors are acting as antennas).
>
> if it's the former, then adding filtering on your power supply might 
> help.
>
> If it's the latter, making sure you're not radiating (return path for 
> sparks, etc.  Maybe a faraday cage, but I'm not sure that is practical 
> or will work well in your situation.
>
>
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