Electronics > Projects, Designs, and Technical Stuff
What I.D. of tubing would you use with a 1.93mm barbed connector? Where to buy?
rs20:
I got myself a HSCDRRT001PD2A3 differential pressure sensor, having not thought ahead to the tubing which I'll need to connect on to its barbed connectors. Obviously it depends on the flexibility of the tube material to a certain extent, but what sort of hose I.D. / wall thickness would y'all recommend to connect on with a nice leak-proof connection? The pressure inside the tubing will be well under 1 psi = 6.9 kPa. The drawing shows a 1.93mm O.D. on the widest part of the barb, which I have confirmed with my calipers on the real part:
Also, where would one find and purchase such a tube in Australia (or at least, delivering to Australia?) I've tried one outfit (Gecko Optical) who AFAICT have just taken my money and run off EDIT: turns out there was a mix-up in the mail room and I had packages delayed by a month, Gecko Optical delivered great tubing just fine as it turns out; and a lot of tubing ranges I find online don't go below 1.93mm, others are "request a quote" type places which I would prefer to avoid unless someone can tell me they're actually friendly to hobbyists. It would be nice if the tubing is food grade and/or clear (or at least translucent.) Any and all other advice in the sphere of making pneumatic connections is welcomed.
Ian.M:
What's the diameter just behind the barb, and what's the diameter of the front edge of the barb taper?
Unless the tubing is a very soft rubber, it will be a PITA to get on if its ID is much less than the barb taper, and may not seal reliably if its larger than the diameter behind the barb.
Also, those are very small plastic barbs. The tubing needs to be pretty soft or there's a high risk you'll break the barbs while trying to fit it. I'd be looking at thick wall silicone tubing.
ChristofferB:
I'd check ebay for tubing manufacturers. You can usually find listing with multiple diameters dirt cheap, then get a few meters of a few different ones. Find one that fits the best and have a stock of different tubing for future projects!
Oh and remember long lengths of very soft tubing has enough elasticity and pressure drop to offset pressure measurements
ChristofferB:
Alternatively, you could get some normal sized plastic double ended hose barbs, drill them out in one end to fit over the sensor port and epoxy them onto them, casting the entire port side in epoxy to stabilise the thin ports might be advantageous too
rs20:
--- Quote from: Ian.M on June 08, 2019, 09:47:53 am ---What's the diameter just behind the barb, and what's the diameter of the front edge of the barb taper?
Unless the tubing is a very soft rubber, it will be a PITA to get on if its ID is much less than the barb taper, and may not seal reliably if its larger than the diameter behind the barb.
Also, those are very small plastic barbs. The tubing needs to be pretty soft or there's a high risk you'll break the barbs while trying to fit it. I'd be looking at thick wall silicone tubing.
--- End quote ---
Thanks for the advice. I'm measuring about 1.55mm on straight bit behind the barbs, and I honestly can't get a good measurement on the front edge, maybe 1.7mm or so. This means I'll have to choose between a good seal and it being a PITA; but I think I can make it less of a PITA by flaring out the first mm of the tubing with a drill bit.
So I could go for this eBay listing with the 1.5mm ID 3.5mm OD variant, do you think that'd be a good idea?
--- Quote from: ChristofferB on June 08, 2019, 10:41:08 am ---I'd check ebay for tubing manufacturers. You can usually find listing with multiple diameters dirt cheap, then get a few meters of a few different ones. Find one that fits the best and have a stock of different tubing for future projects!
--- End quote ---
Thanks. I found the link above, but that's from China and therefore several weeks away. I really feel like something as simple as silicone tubing should be more readily accessible, but then again I suppose I'm looking for an unusual size.
--- Quote ---Oh and remember long lengths of very soft tubing has enough elasticity and pressure drop to offset pressure measurements
--- End quote ---
Only if there is flow? I'd assume this thing has no "bias flow", or is that naive?
Navigation
[0] Message Index
[#] Next page
Go to full version