If you recognize this button and know where to buy it, email snipped-for-privacy@gmail.com.
Will pay $20 for the first correct answer. These buttons are hermetically sealed, about the size of a quarter and ultra-flat. Picture at:
Type? (SPDT, etc) Action? (momentary, etc) Current and voltage rating? DC or AC?
You can DIY with a "burglar alarm" seal contact and the magnet.
When the magnet is close to the contacts they close. When the magnet is withdrawn, they open.
You can also look into "explosion proof" boxes and switches and buttons. These are designed that IF an internal spark causes an explosive gas mixture to ignite within the box, the box (and switches) will contain the explosion and only permit relatively cool gasses to escape.
On Fri, 5 Jan 2007 20:41:05 -0500, "John Gilmer" Gave us:
Actually, a sealed explosion proof switch is designed specifically to be FULLY SEALED, and allow NO gas to enter such that NO arc between the switch contacts will EVER cause a vapor ignition ANYWHERE, regardless of installation location (cabinet, bulkhead, control panel, etc. It seals the contacts away from the world. I know of nothing in the design meant to slow an ignition. If a volatile gas gets into a switch with oxygen in the switch case as well, it will ignite upon arcing, and that ignition WILL escape at higher than flashpoint temperatures. Basic physics. An example of a similar analogy would be engine exhaust pipes get hot, capped or not.
Explosion proof switches can be installed directly in volatile environs, and are made for those needs.
On 3 Jan 2007 09:20:56 -0800, snipped-for-privacy@gmail.com Gave us:
That is a custom switch. You need to buy it as a replacement part FROM the manufacturer of the product it came from.
If they will not sell it to you directly, you need to find a TV repair tech or other fix it business person, and become their friend so you can get then to order one for you.
It looks like it would be a 5 or 10 dollar switch, because it certainly does look custom.
What it doesn't look like is hermetically sealed. That encapsulant on the back is merely holding the LED in its position, and strain relieving the flex leads.
The flex leads point toward custom as well.
On 3 Jan 2007 09:20:56 -0800, snipped-for-privacy@gmail.com Gave us:
OK it does look sealed now that I looked again.
WHy is the exact switch needed if it is a mere prototype?
Also, is the LED absolutely necessary to be IN the switch?
Sure would reduce overall costs for both the proto as well as the run to incorporate it onto the PCB elsewhere.
Also, $20 ain't jack shit for the time someone would or could spend digging it up for you.
No way to find that PCB assemblies maker and ask, eh? Hmmmm... What IS the assembly the switch in the photo is attached to?
Bill Kaszeta Photovoltaic Resources Int'l Tempe Arizona USA snipped-for-privacy@pvri-removethis.biz
You are assuming a hermetic seal. It just doesn't happen. Explosive proof motors have a heavy (and sealed) frame. And it IS quite possible to contain a gas explosion. It's not the same as the explosion in a gas engine where the charge is compressed. The combination of low volumn, strong containment, and "cool" metal keep high pressures from escaping.
If you want to talk about the "physics" I suggest you look at the "Safety Lamp" which has a FLAME. A safety lamp can be exposed to an explosive gas mixture. The gas mixture will enter the lamp and, indeed, will flare but NO hot gasses escape.
On Mon, 8 Jan 2007 10:12:53 -0500, "John Gilmer" Gave us:
Safety lamps are at a positive pressure from within, whenever they are lit. The carbide exudes gas (positive pressure), then it burns (more positive pressure). It doesn't ignite gases in the mine because it only releases spent exhaust fumes that are not hot enough to flash methane.
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