Cheap no machining PPO2 display housing -in progress

undrh2o · 23rd May 2007, 00:22

OK, so I've been looking for a way to make a quick no machining required housing for a dual display PPO2 monitor to get me started while I work on a PICaxe based LCD display/HUD. Well, I found this - the OMS part # BCA298 660ft depth rated canister (http://www.omsdive-ca.com/bc_access.html).
I'd actually been thinking about it for a DIY canister light battery housing a while back but since it's clear it lends itself to my current needs nicely.

I'm going add to it some Chinese digital panel meters bought off eBay (shown) similar to the Oxycheq el-cheapo O2 meter, an electronics proto board, a 9volt, some trim pots, a cable gland, etc and I should have a reasonable PPO2 meter for under $100 less the cost of the sensors.

The end caps are thick enough to accept drilling and tapping for a cable gland on one end and 3/8-24 plug for the trim pots on the other.

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**SeaBass** · 23rd May 2007, 05:22

Very Nice! Love to see it when it is finished.

--SB

Corallaro · 23rd May 2007, 08:33

Nice!

see my solution:

http://www.rebreatherworld.com/home-...od-time-5.html

i use a "3-1/2D LCD Digital Panel Meter PM 438" and i cut plastic borders to recover space....

see my electronic mod...

Giovanni

KevJ · 23rd May 2007, 11:02

Good solution,

I've used these cans before for making small capacity battery packs for testing and never had an issue with them. The ABS endcaps are good to glue to as well - not like nasty delrin.

Those panel meters look good. What height are the digits ? I'm using Lascar displays but the digits are a bit on the small side.

Kevin

lizardland · 23rd May 2007, 11:56

How much are the cannisters out of interest? I was at a subsea equipment trade show a couple of years ago and was talking to a rep from a company that made simple double o-ring lexan cylinder housings very similar to this for survey kit and he was talking in excess on 500m depth rating with a fairly thin wall (1/4" IIRC).

Quote: (Originally Posted by KevJ)

Those panel meters look good. What height are the digits ? I'm using Lascar displays but the digits are a bit on the small side.

I used to use them in my homebuild too. To give you an idea of the size, here is one next to Datel meter as used in the Mark Munro meter design. The Datels are roughly twice the height of a Lascar, so you can work out the display size from that.

The main reason I moved to the Datels is that they weren't very robust displays (they don't like rough treatment) and they didn't tolerate water very well either.

Cheers,

Stuart

KevJ · 23rd May 2007, 14:16

Thanks Stuart, I'll see if I can find some.
Somehow I doubt the Lascar ones are much good either when immersed in sea water

Kevin

lizardland · 23rd May 2007, 16:28

Quote: (Originally Posted by KevJ)

Thanks Stuart, I'll see if I can find some.
Somehow I doubt the Lascar ones are much good either when immersed in sea water

Kevin

Lascars are used in the KISS... less said the better

I've managed to resurrect a couple in mine but they have never been the same (dead segments on the LCD).

The Datels are much more resilient, they are better sealed against water ingress and have what looks like a resin coating over the board at the back but quite a bit bigger than the titchy Lascar displays. My Datels used to get flooded regularly

in my homebuilds and always recovered, the Lascars in my KISS needed replacing after one dunking.

Cheers,

Stuart

Mdemon · 23rd May 2007, 17:06

How much for the cannister?

jmhardingjr · 23rd May 2007, 17:22

Quote: (Originally Posted by Mdemon)

How much for the cannister?

$39.95 from Leisure Pro.

**Dave Sutton** · 24th May 2007, 01:37

Quote: (Originally Posted by jmhardingjr)

$39.95 from Leisure Pro.

Send a dozen.....

Good find! These will make another "standard" item for the community. Well done!

Dave

23rd May 2007, 00:22	#1 (permalink)
undrh2o Chris Miller Current Rebreather/s: Other CCR Dolphin Home Build Other Rebreather/s: Inspiration Classic Other CCR Dolphin Home Build Join Date: Apr 2006 Location: Ottawa, Canada Posts: 206	Cheap no machining PPO2 display housing -in progress OK, so I've been looking for a way to make a quick no machining required housing for a dual display PPO2 monitor to get me started while I work on a PICaxe based LCD display/HUD. Well, I found this - the OMS part # BCA298 660ft depth rated canister (http://www.omsdive-ca.com/bc_access.html). I'd actually been thinking about it for a DIY canister light battery housing a while back but since it's clear it lends itself to my current needs nicely. I'm going add to it some Chinese digital panel meters bought off eBay (shown) similar to the Oxycheq el-cheapo O2 meter, an electronics proto board, a 9volt, some trim pots, a cable gland, etc and I should have a reasonable PPO2 meter for under $100 less the cost of the sensors. The end caps are thick enough to accept drilling and tapping for a cable gland on one end and 3/8-24 plug for the trim pots on the other. SV400819 (Small).JPG SV400811 (Small).JPG SV400813 (Small).JPG SV400818 (Small).JPG
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23rd May 2007, 05:22	#2 (permalink)
SeaBass Thom Susko Current Rebreather/s: Megalodon Ray Home Build Other Rebreather/s: Not Bought Yet Ray Home Build Join Date: Jul 2006 Location: San Clemente, CA Posts: 246	Re: Cheap no machining PPO2 display housing -in progress Very Nice! Love to see it when it is finished. --SB
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23rd May 2007, 08:33	#3 (permalink)
Corallaro IDA-71,IDA-76,NaubosAR90 Current Rebreather/s: Other CCR Other Rebreather/s: Not Bought Yet Other CCR Join Date: Oct 2006 Location: Italia - Sicilia Posts: 248	Re: Cheap no machining PPO2 display housing -in progress Nice! see my solution: http://www.rebreatherworld.com/home-...od-time-5.html i use a "3-1/2D LCD Digital Panel Meter PM 438" and i cut plastic borders to recover space.... see my electronic mod... Giovanni
(Offline)

23rd May 2007, 11:02	#4 (permalink)
KevJ New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: Ireland, blow-in, Not escaped yet Posts: 43	Re: Cheap no machining PPO2 display housing -in progress Good solution, I've used these cans before for making small capacity battery packs for testing and never had an issue with them. The ABS endcaps are good to glue to as well - not like nasty delrin. Those panel meters look good. What height are the digits ? I'm using Lascar displays but the digits are a bit on the small side. Kevin
(Offline)

23rd May 2007, 11:56	#5 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,387	Re: Cheap no machining PPO2 display housing -in progress How much are the cannisters out of interest? I was at a subsea equipment trade show a couple of years ago and was talking to a rep from a company that made simple double o-ring lexan cylinder housings very similar to this for survey kit and he was talking in excess on 500m depth rating with a fairly thin wall (1/4" IIRC). Quote: (Originally Posted by KevJ) Those panel meters look good. What height are the digits ? I'm using Lascar displays but the digits are a bit on the small side. I used to use them in my homebuild too. To give you an idea of the size, here is one next to Datel meter as used in the Mark Munro meter design. The Datels are roughly twice the height of a Lascar, so you can work out the display size from that. The main reason I moved to the Datels is that they weren't very robust displays (they don't like rough treatment) and they didn't tolerate water very well either. Cheers, Stuart __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
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23rd May 2007, 14:16	#6 (permalink)
KevJ New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: Ireland, blow-in, Not escaped yet Posts: 43	Re: Cheap no machining PPO2 display housing -in progress Thanks Stuart, I'll see if I can find some. Somehow I doubt the Lascar ones are much good either when immersed in sea water Kevin
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23rd May 2007, 16:28	#7 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,387	Re: Cheap no machining PPO2 display housing -in progress Quote: (Originally Posted by KevJ) Thanks Stuart, I'll see if I can find some. Somehow I doubt the Lascar ones are much good either when immersed in sea water Kevin Lascars are used in the KISS... less said the better I've managed to resurrect a couple in mine but they have never been the same (dead segments on the LCD). The Datels are much more resilient, they are better sealed against water ingress and have what looks like a resin coating over the board at the back but quite a bit bigger than the titchy Lascar displays. My Datels used to get flooded regularly in my homebuilds and always recovered, the Lascars in my KISS needed replacing after one dunking. Cheers, Stuart __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
(Offline)

23rd May 2007, 17:06	#8 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,946	Re: Cheap no machining PPO2 display housing -in progress How much for the cannister?
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23rd May 2007, 17:22	#9 (permalink)
jmhardingjr Son of a Sailor Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Sep 2005 Location: . . . this one particular harbor . . . Posts: 201	Re: Cheap no machining PPO2 display housing -in progress Quote: (Originally Posted by Mdemon) How much for the cannister? $39.95 from Leisure Pro. __________________ ". . . the sea's in my veins, my tradition remains, I'm just glad I don't live in a trailer . . ."
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24th May 2007, 01:37	#10 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: Cheap no machining PPO2 display housing -in progress Quote: (Originally Posted by jmhardingjr) $39.95 from Leisure Pro. Send a dozen..... Good find! These will make another "standard" item for the community. Well done! Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com
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