Electronics > Projects, Designs, and Technical Stuff

Limit switches and reed switches for use in vacuum

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RoGeorge:
If you are on a very tight budget, auto spark-plugs can be used as electrical feed-through.

i_am_fubar:
Allectra & hositrad for the UK and europe. but pretty much that switch I linked was all I found when I was looking for my application. Most vac specialists sell the same one.

Couple of gold plated spring terminals is cheaper option. Take care with handling, gloves are a must to keep clean.

Not tried reed switches, but glass with compatible leads should be fine. Crimp or screw, don't solder.

Sorted the feedthroughs already?

Doctorandus_P:
If you're thinking reed switches, then you're thinking magnetics.

Which opens up the road to HALL sensors.
If you want them small, they can be bought in SOT23 packages.

i_am_fubar:
Be wary of any conventional chips. PCBs become a huge issue with solder, silicone, out gassing... Etc

You can get hal effect transducers for UHV, but they are crazy expensive and need external drivers.

GasperSB:
No, I haven't selected feedthroughs yet. I first want to define all electrical components and then based on that decide what is needed and what is the most suitable.

Yeah, I thought about reed switches because some already have a vacuum inside the glass tube, therefore, the leads could already be vacuum compatible.

We have a moderate budget for this project. But I would definitely like to stay away from super expensive components.

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