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Pressure activated switch

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Pressure activated switch

Unread postAuthor: PVC Arsenal 17 » Sat Aug 15, 2009 1:37 am

A long time ago I recall seeing a pressure activated switch being sold by one of the spud gun stores... possibly BC Arms.

The switch was a small, simple unit with a 1/8" NPT male thread which would connect to the pressure vessel. On the opposite end were two contacts. When the pressure reached a certain point, (IIRC 125psi) the circuit would close.

I've found various sorts of pressure switches but none as compact and simple as this one was. I'm very inexperienced with electronics so if anyone could point me toward something similar to what I saw it would be much appreciated.

I hope to incorporate this switch into a device that is part of an ROV project I'm working on.

Thanks!
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 15, 2009 1:53 am

you could probably conjure something up yourself with a 1 mL syringe, a spring and some epoxy ;)
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Unread postAuthor: inonickname » Sat Aug 15, 2009 1:58 am

Erm, modify a 120psi pop off valve to close the switch (but not have it actually release air).. That's how I'd do it.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 15, 2009 2:07 am

inonickname wrote:Erm, modify a 120psi pop off valve to close the switch (but not have it actually release air).. That's how I'd do it.


The problem with that is that it would have to be a toggle switch, that would not reset once the pressure goes back down again.
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Unread postAuthor: PVC Arsenal 17 » Sat Aug 15, 2009 2:07 am

Building a switch is always possible, but it doesn't guarantee reliability, consistency, and speed (I need to incorporate a fair number of these into the project)

My search continues!
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Unread postAuthor: MrCrowley » Sat Aug 15, 2009 2:17 am

I think it might've been Benstern's Spudmall...not sure.
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Unread postAuthor: PVC Arsenal 17 » Sat Aug 15, 2009 2:25 am

MrCrowley wrote:I think it might've been Benstern's Spudmall...not sure.


Yes that was it!

Here it is:
Image

Now to find out more about the switch and hopefully find a similar one that can activate somewhere in the realm of 30psi.
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Unread postAuthor: inonickname » Sat Aug 15, 2009 7:09 am

Seen as you're a buff with electronics, you could perhaps modify an electronic tire gauge to trigger at a certain pressure.

The problem with that is that it would have to be a toggle switch, that would not reset once the pressure goes back down again.

Note that i said to modify it, so it's a pneumatic ram fighting a spring (and does not exhaust). Once it reaches pressure, it activates the circuit (and does not release air).. Then resets at lower pressures.
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Unread postAuthor: Moonbogg » Sat Aug 15, 2009 7:18 am

http://www.mcmaster.com/#pressure-switches/=374w9o

here check out mc master on that page.
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Unread postAuthor: TurboSuper » Sat Aug 15, 2009 8:46 am

http://search.digikey.com/scripts/DkSea ... 80-2041-ND

A little on the expensive side, though.
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