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Thread: Any good tips on small indicator lamps?

  1. #1

    Default Any good tips on small indicator lamps?

    Hi, for my canister, I'm considering a piezo pushbutton. But in that case, I'll need a small indicator light on the canister (for suit heating).
    Advice on what indicator lights/3/5mm LED holders that are suitable for high pressure is very welcome!
    Best regards, Eskil

  2. #2

    Default Re: Any good tips on small indicator lamps?

    Did anyone try this?
    https://dk.farnell.com/vcc-visual-co...ent/dp/2748734
    I'm a bit worried about the very steep tread on the inner nut. I would expect that a very soft spring washer should be used on the inside, or maybe it should be glued.

  3. #3
    Flashaholic* DIWdiver's Avatar
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    Default Re: Any good tips on small indicator lamps?

    Actually, I have used a larger version of that part. I think it fits a 12mm (maybe bigger) hole.

    I had very little confidence that the o-ring would seal given the minimal pressure that can be applied with a nut with such steep threads, so I ended up changing out the o-rings for softer silicone ones. That seems to keep the rain out, but I've never put one under water.

    The lens is pretty thin, and I'd be worried that it wouldn't hold up under the rigors of being on a piece of diving equipment.

    I think you'd be much better off with a small diameter light pipe than a big lens like that.

  4. #4

    Default Re: Any good tips on small indicator lamps?

    Hi DIWdiver, thanks for your reply, and you many other good replies here!
    I'm considering then to skip the switch on the cannister, and put it in the cable inlet under my inflation valve.

    Then I stand back with two important questions:

    1) Cable gland. The selection of 10bar approved glands with long metric thread, suitable for 9.6mm cable isn't large.
    I bought these:
    Lapp skintop MS-M-XL
    https://se.lappgroup.com/fileadmin/d...53112005EN.pdf
    but after getting it I notice the odd fingered plastic/rubber insert, it is not a rubber cone. The waterproofing between plastic and brass is that the plastic is pressed into a brass cone. Does that really work??

    2) over pressure valve. My cannister will be hermetically sealed, and considering an over pressure valve, which could be a regulator (1st stage) over pressure valve. Do I need one, and do you have better suggestions?

  5. #5
    Flashaholic* DIWdiver's Avatar
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    Default Re: Any good tips on small indicator lamps?

    Without seeing the actual gland parts, I can't really comment on it, but I have seen glands that have a rubber seal and a plastic part that helps the metal nut slide against the rubber as you tighten it.

    I don't think LiIon cells offgas under normal operations as some other cells can, but you should make sure the canister cannot become a bomb if the cells fail catastrophically. UL requires a vent of 20 sq mm area (not 20 mm sq). I don't think a scuba OPV would meet this requirement.

  6. #6

    Default Re: Any good tips on small indicator lamps?


    Hi DIWdiver

    Pictures below. Thanks for your time!

    I guess the central reason for the plastic is to allow a large span of cable diameters.
    https://www.dropbox.com/s/wdwql0rnjc...3619s.jpg?dl=0
    https://www.dropbox.com/s/w8o4uvtszg...3621s.jpg?dl=0

    Best regards, Eskil

  7. #7
    Flashaholic* DIWdiver's Avatar
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    Default Re: Any good tips on small indicator lamps?

    As I suspected, the plastic piece is there to compress the rubber without chafing it. For smaller cables, you'd change the rubber part, not the plastic. Looks like that one is for the largest size that gland can take.

    Nice pics, by the way.

    If you want the pics to show up in the post, you have to edit the first part of the URL to https://dl.dropboxusercontent.com when you paste it in the 'insert image' box. And make sure they are no bigger than 800x800 pixels.

  8. #8

    Default Re: Any good tips on small indicator lamps?

    Thanks DIWdiver!
    That insert is good all the way from 4 to 10mm cable, no wonder they prefer to stock one part instead of several.
    My worry is that the connection between plastic and brass cone has to be watertight. I wonder if I should give the brass cone silicone grease, where it should tighten to the plastic?
    Or buy new glands, like blueglobe
    bg816ms
    . Just annoying to have to pay 50USD again for minimum purchase + shipping.
    Thanks for the tip on inserting pictures!
    Best regards, Eskil

  9. #9
    Flashaholic* DIWdiver's Avatar
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    Default Re: Any good tips on small indicator lamps?

    I doubt very much they are depending on a plastic to metal seal. The ones I've seen have a flange on the rubber that seals against the metal part.

  10. #10
    Flashaholic* lucca brassi's Avatar
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    Default Re: Any good tips on small indicator lamps?

    The easy way is to drill , through plastic , make threads to the hole , put some sealent on the threads , screw in polycarbonate screw like or similar

    https://www.amazon.com/Polycarbonate.../dp/B012T3JFT2 , dry sealent , grind cap down in wet and polish (in other case polycarbonate may crack ), enjoy

    clean work!

    valve

    https://www.bluezonegroup.com.au/ann...-relief-valves
    Last edited by lucca brassi; 03-19-2019 at 02:38 PM.

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