One piece Meg O2 cal plug

Skipbreather · 6th January 2006, 23:53

Well, it’s winter here and the water got hard, so no diving. My Meg is sits in the basement with nowhere to go, looking just as bored as I feel. The lathe beckoned……..

What you see is a one piece Meg O2 calibration device. Idea was to eliminate the second bit of the Meg cal kit and to use the absolute least amount of O2 possible for calibration.

How it works: The plug extends about ½ inch beyond the chamber where the sensors “see” the loop gas. Its diameter is about 0.022 inch less than the gas passage at that point, allowing supplied O2 to leak freely enough to not build up pressure that would screw up the cal, but tight enough to prevent backflow of ambient air.

To use, Meg electronics are turned on and the cal option is selected. Ambient air part of cal is done normally. Plug is now inserted as shown and O2 is supplied to plug at a low rate. When you’re happy w/ readings, confirm your O2 cal.

Flow rates: I use a medical O2 reg and bottle. I first flush for a few seconds w/ 15 lpm, then turn the flow down to the reg’s lowest setting, 2 lpm. I’m at 900 ft elevation. At 15 lpm #1 sensor stabilized at 51.4 MV. This dropped to 51.0 MV at 10 lpm. The 51.0 MV was unchanged at 6 lpm, 4 lpm and 2 lpm, indicating essentially no back pressure = good to go on the O2 calibration.

I eventually plan to make up a small flow restrictor that hooks up to the manual O2 bypass hose w/ a BC-type connector that flows about 1 to 2 lpm for use in the field when no medical reg/bottle is handy. All you shop wise Meg divers feel free to copy.

Ken

Pelagian · 8th January 2006, 16:27

Nice.

How much?

Cheers

Seb

***caveseeker7*** · 8th January 2006, 19:02

Oddly enough (considering the number of Meg divers at Rebreather World) not much response.
I don't have one, but like what you did. Good job, Ken, let us know how the final version will turn out.

cedricverdier · 9th January 2006, 10:51

Hi,

Nice job.
With a flow restrictor that could be connected to a LPI hose, it would become similar to the existing calibration kit, with fewer part but I guess the same weight.

Cheers

Gilles · 5th February 2006, 01:11

Nice work. I'm wondering if there's scope to simplify your design further. Just a suggestion.

Why not simply cut your plastic cylinder just below the level of the O2 vent holes to more accurately simulate what really occurs (i.e. gas flowing up into the sensor chamber without actually being directed to the sensor faces as done by the vent holes).

Although you may not get 100% O2 getting blown on the sensor faces, you do get the effect (i.e. in mv) of 100% O2 gas circulating in that part of the loop.

I'm considering your invite to copy your idea. Thanks.

Gilles

Deep Thought · 5th February 2006, 01:49

Ken

I'm looking forward to using the meg cal plug with the bcd connector on the March Truk Lagoon trip as there are several Meg divers in the group, should make cal easy.

Your Avatar looks like you need to either brush off the snow, or go diving...tsk, tsk, tsk...such a nice dive mobile and collecting snow!

DT

***caveseeker7*** · 5th February 2006, 08:28

With Lou on holiday diving Ken's article went online unannounced. Make sure you don't miss Easy Meg Calibration Using Just 1 Liter O2, with plenty of pictures and a complete schematic drawing with size specs.

***Louby Lou*** · 12th February 2006, 16:20

Quote: (Originally Posted by caveseeker7)

With Lou on holiday diving Ken's article went online unannounced. Make sure you don't miss Easy Meg Calibration Using Just 1 Liter O2, with plenty of pictures and a complete schematic drawing with size specs.

I'm back

Anyway, what Stefan said...

Ken's article is all fully loaded into the library HERE - please use this thread to post any questions, comments or feedback you may have.

Once again, many thanks Ken for sharing your article

Cheers

Lou

**trob09** · 21st February 2006, 15:33

Quote: (Originally Posted by Pelagian)

Nice.

How much?

Cheers

Seb

Ken, I second Seb's question, how much?

tim

Explorer · 21st February 2006, 15:44

What does Leon use for a Meg O2 calibration device?

6th January 2006, 23:53	#1 (permalink)
Skipbreather Reads the fine print Current Rebreather/s: Megalodon Home Build Other Rebreather/s: Not Bought Yet MK 15.X Home Build Join Date: Mar 2005 Location: Chicago, Illinois, USA Posts: 539	One piece Meg O2 cal plug Well, it’s winter here and the water got hard, so no diving. My Meg is sits in the basement with nowhere to go, looking just as bored as I feel. The lathe beckoned…….. What you see is a one piece Meg O2 calibration device. Idea was to eliminate the second bit of the Meg cal kit and to use the absolute least amount of O2 possible for calibration. How it works: The plug extends about ½ inch beyond the chamber where the sensors “see” the loop gas. Its diameter is about 0.022 inch less than the gas passage at that point, allowing supplied O2 to leak freely enough to not build up pressure that would screw up the cal, but tight enough to prevent backflow of ambient air. To use, Meg electronics are turned on and the cal option is selected. Ambient air part of cal is done normally. Plug is now inserted as shown and O2 is supplied to plug at a low rate. When you’re happy w/ readings, confirm your O2 cal. Flow rates: I use a medical O2 reg and bottle. I first flush for a few seconds w/ 15 lpm, then turn the flow down to the reg’s lowest setting, 2 lpm. I’m at 900 ft elevation. At 15 lpm #1 sensor stabilized at 51.4 MV. This dropped to 51.0 MV at 10 lpm. The 51.0 MV was unchanged at 6 lpm, 4 lpm and 2 lpm, indicating essentially no back pressure = good to go on the O2 calibration. I eventually plan to make up a small flow restrictor that hooks up to the manual O2 bypass hose w/ a BC-type connector that flows about 1 to 2 lpm for use in the field when no medical reg/bottle is handy. All you shop wise Meg divers feel free to copy. Ken Last edited by Louby Lou : 12th February 2006 at 16:15.
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8th January 2006, 16:27	#2 (permalink)
Pelagian Multi-Circuit Meg Monkey! Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Optima Join Date: Feb 2005 Location: Leeds, England Posts: 275	Re: One piece Meg O2 cal plug Nice. How much? Cheers Seb __________________ 'Because... I was Inverted!'
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8th January 2006, 19:02	#3 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,408	Re: One piece Meg O2 cal plug Oddly enough (considering the number of Meg divers at Rebreather World) not much response. I don't have one, but like what you did. Good job, Ken, let us know how the final version will turn out. __________________ Cheers Stefan "It is still a good day if you are on the green side of the grass! Su amigo Roberto!" Sponsor Lou in Race For Life!
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9th January 2006, 10:51	#4 (permalink)
cedricverdier S21 M.I.B. Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Sport Kiss Classic Kiss Join Date: Apr 2005 Location: Worldwide! Posts: 494	Re: One piece Meg O2 cal plug Hi, Nice job. With a flow restrictor that could be connected to a LPI hose, it would become similar to the existing calibration kit, with fewer part but I guess the same weight. Cheers __________________ Cedric Verdier PADI Course Director, ANDI-IANTD-PSAI-TDI-DSAT-DAN-NAUI-CMAS Instructor Trainer Trimix (CCR and OC) and Cave Diving Instructor Trainer www.CedricVerdier.com DIRrebreather member
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5th February 2006, 01:11	#5 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: One piece Meg O2 cal plug Nice work. I'm wondering if there's scope to simplify your design further. Just a suggestion. Why not simply cut your plastic cylinder just below the level of the O2 vent holes to more accurately simulate what really occurs (i.e. gas flowing up into the sensor chamber without actually being directed to the sensor faces as done by the vent holes). Although you may not get 100% O2 getting blown on the sensor faces, you do get the effect (i.e. in mv) of 100% O2 gas circulating in that part of the loop. I'm considering your invite to copy your idea. Thanks. Gilles __________________ Gilles http://www.dirrebreather.com
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5th February 2006, 01:49	#6 (permalink)
Deep Thought Custom Title Allowed! Current Rebreather/s: Inspiration Vision Classic Kiss Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon Sport Kiss Classic Kiss Optima Join Date: Apr 2005 Location: Great Lakes Posts: 190	Re: One piece Meg O2 cal plug Ken I'm looking forward to using the meg cal plug with the bcd connector on the March Truk Lagoon trip as there are several Meg divers in the group, should make cal easy. Your Avatar looks like you need to either brush off the snow, or go diving...tsk, tsk, tsk...such a nice dive mobile and collecting snow! DT __________________ Creature Of Habits; Mostly Bad www.gudcscuba.com
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5th February 2006, 08:28	#7 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,408	Skipbreather's Calibration Article With Lou on holiday diving Ken's article went online unannounced. Make sure you don't miss Easy Meg Calibration Using Just 1 Liter O2, with plenty of pictures and a complete schematic drawing with size specs. __________________ Cheers Stefan "It is still a good day if you are on the green side of the grass! Su amigo Roberto!" Sponsor Lou in Race For Life!
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12th February 2006, 16:20	#8 (permalink)
*Louby Lou* Fingers crossed..... Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: Roman Corinium! Posts: 1,030	Re: Skipbreather's Calibration Article Quote: (Originally Posted by caveseeker7) With Lou on holiday diving Ken's article went online unannounced. Make sure you don't miss Easy Meg Calibration Using Just 1 Liter O2, with plenty of pictures and a complete schematic drawing with size specs. I'm back Anyway, what Stefan said... Ken's article is all fully loaded into the library HERE - please use this thread to post any questions, comments or feedback you may have. Once again, many thanks Ken for sharing your article Cheers Lou __________________ Miss Lou x Use of Rebreather World is subject to the Rebreatherworld Terms and Conditions - Please read! Outlaw Divers - Sssh we're diving! You heff vays uff dealink vis zem, oh Miss Rebreather World Admin! - Rob Davie Feb 06
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21st February 2006, 15:33	#9 (permalink)
trob09 . Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2005 Posts: 696	Re: One piece Meg O2 cal plug Quote: (Originally Posted by Pelagian) Nice. How much? Cheers Seb Ken, I second Seb's question, how much? tim
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21st February 2006, 15:44	#10 (permalink)
Explorer I will teach you a..... Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Alberta, Canada Posts: 760	Re: One piece Meg O2 cal plug What does Leon use for a Meg O2 calibration device? __________________ REALLY FRICKIN' TRAIN WRECKED..... Last edited by Explorer : 21st February 2006 at 15:57.
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