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Re: [PSUBS-MAILIST] Blueglobe cable glands
Hi Jon,
Thanks, Yes I was going down the track of trying to coble something together
from a plumbing supplier, but these "Blueglobe" connectors look good. I'm
thinking that for added security they may be able to be partially potted with
epoxy, provided it's compatible with their patented seal. to
Here is a PDF that describes them in more detail.
http://www.servoconnectors.co.uk/pdfs/cablegland_blueglobe.pdf
Alan
----- Original Message -----
From: "Jon Wallace" <jonw@psubs.org>
To: <personal_submersibles@psubs.org>
Sent: Monday, November 15, 2010 6:22 AM
Subject: Re: [PSUBS-MAILIST] Blueglobe cable glands
It looks like these units are simple compression fittings. You can make
your own by using a brass compression water plumbing fitting for sinks
and toilets. For example, on my underwater camera I used 1/8npt x 5/16
compression, removed the brass compression sleeve, and substituted it
with a grommet that fit tightly both around the wire (USB) and inside
the compression fitting wall. I added a nylon washer on both sides of
the grommet to both take up space and provide a surface to compress the
grommet. I never tested mine however to determine exactly what the
pressure rating would be and so never considered it for the pressure
hull. If the fitting failed and I lost the web-cam then I only lost
$79, but didn't want to risk an issue with the pressure hull.
It's nice to have some test numbers that give some idea of the pressure
rating, however I suspect that the rating is going to depend not only on
the wire jacket but also on the amount of torque applied to the nut to
compress the rubber grommet. Too little torque will reduce the pressure
rating. Too much torque could extrude the compression material, crack
it, rip it, or fail by some other means by putting too much force on the
material.
Jon
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603-529-1100
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