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Re: RE- panic button
Subject: Re: RE- panic button
Date: Tue, 10 Jun 1997 19:15:15 +1000
From: Peter Electric <elekessy-at-macquarie.matra-dot-com.au>
To: Tesla List <tesla-at-pupman-dot-com>
References: 1
Tesla List wrote:
>
> Subject: RE- panic button
> Date: Mon, 09 Jun 1997 12:57:00 GMT
> From: robert.michaels-at-online.sme-dot-org (Robert Michaels)
> Organization: Society of Manufacturing Engineers
> To: tesla-at-pupman-dot-com
>
> T> From: "William Noble" <William_B_Noble-at-msn-dot-com>
> T>there is a switch made for use on jacuzzis where shock hazard is
> pretty
> T>significant. The switch is pneumatic - there is a button that you
> T>install
> T>near the jacuzzi, and then a 1/4 inch plastic hose (like aquarium air
> T>line)
> T>that runs to the pump controls. pressing the button starts/stops the
> T>blowers
>
> [ ... ]
>
> There's one thing about your idea which I completely dis-
> like:
>
> I wasn't the one who thought of it!
>
> My only concerns in implementing it are whether the pneumatic
> button must pushed =hard= to send a proper air pulse
> to the controller; also how much of a delay there might be
> between the button-push and the controller's reaction.
>
> With an electrical E-Stop push button, only a
> delicate touch is necessary to break the normally-
> closed contacts. The signal, of course, is sent
> with electric speed.
>
> Pushing on, in --
> Detroit, USA
>
> Robert Michaels
I have these controls on my spa (Jacuzzi) and they do get a bit dicky
after a while, i.e. you have to press it a couple of times to get it to
work. The other problem I see is that if you have a fairly long length
of tubing, pressing the button wouldn't build up enough pressure to
trigger the switch.
Maybe if one attached a squeeze bulb instead of a button, such as on
boat fuel primers, the thing might work better.
Cheers,
Peter E.