Re: RF Immunity in Smoke Detectors

["Roland Moore" <roland@xxxxxxxxxxxx>]

I have battled RF problems for years. I have installed more > 1uH chokes
than I care to mention. Since Y2K I  have only had my ass eaten alive by
RF/EMI on a DSC 4020 AML loop with fire. The only thing I can say is if
you're trying to trouble shoot the problem and you're convinced it is RF/EMI
related you're pretty much pissing up a rope without a properly scaled
OSCILLOSCOPE and an engineer that knows how to read it. The System Sensor
smoke you mention seems to be end of life. I would try to talk to my factory
rep for what ever replacement brand you pick and put them on the spot to see
if they will put their money where their mouth is. Tell them you have an
installation that needs to be RF proof and see if they will bite and promise
(in writing) to send a (real) engineer to fix their product if it fails in
that environment (and MOST IMPORTANTLY PAY YOU FOR YOUR TIME SPENT). I can't
tell you what happened with DSC officially but I can say that it got fixed
and DSC did the right thing (a.k.a. hush up).

"Eyeball Kid" <jimbo1@xxxxxxx> wrote in message
news:EwXXg.42$AU6.33@xxxxxxxxxxxxxxx
>I have a customer who is an amateur radio operator and is complaining that
>whenever he is transmitting he trips the smoke detector we installed
>(System Sensor 2012HA).  He is asking for a smoke that is better designed
>for RF Immunity.
>
> Almost all the motions I have seen have some spec listing RFI  (typicall
> 30v/m 10-1000Mhz)  but I have not found any such spec on any of the smokes
> I have looked at.  (System Sensor, GE-Interlogix, DSC)
>
> Anyone have any suggestions for a smoke detector in a RF rich environment?
>
> Anyone done an install at a radio station (the transmitter not the studio)
> and what did you use?
>