What Changes Would You Make to A Meg?

netmage · 7th February 2008, 15:47

Quote: (Originally Posted by brandonmc)

huh??

http://www.customrebreathers.com/APE..._5%20rev_A.pdf

Page 12...

brandonmc · 7th February 2008, 16:11

Sorry, I'm still not sure what you are saying? How is it not a 2 point calibration? It was my understanding that if you had something other than air connected at the "at ambient air step" calibration would be off (at least on apecs 2.5 which I am more familiar with), and I have actually witnessed this happen...

netmage · 7th February 2008, 17:15

Quote: (Originally Posted by brandonmc)

Sorry, I'm still not sure what you are saying? How is it not a 2 point calibration? It was my understanding that if you had something other than air connected at the "at ambient air step" calibration would be off (at least on apecs 2.5 which I am more familiar with), and I have actually witnessed this happen...

It's still two point calibration, just the air calib confirmation is removed from user interface...

Calibration window ends two minutes after power on, I suppose the assumption is the head is not yet attached, therefore exposed only to ambient air...

tibby · 7th February 2008, 20:36

Quote: (Originally Posted by netmage)

It's still two point calibration, just the air calib confirmation is removed from user interface...

Calibration window ends two minutes after power on, I suppose the assumption is the head is not yet attached, therefore exposed only to ambient air...

...so be sure not to have the O2 or head only cal kit connected to the head when entering the calibration screen. Been there, done that...
Tibby

Gilles · 7th February 2008, 21:44

Quote: (Originally Posted by netmage)

It's still two point calibration, just the air calib confirmation is removed from user interface...

Calibration window ends two minutes after power on, I suppose the assumption is the head is not yet attached, therefore exposed only to ambient air...

This is no improvement from the original 2 point cal system

.

If it was a more advantageous high FO2 cal protocol, one can simply check the cell linearity by exposing the cells back to air (following an O2 or other high FO2 calibration) and check that the cells indeed all fall back to 21%.

By having any kind of air cal step, this effect gets masked, and you need to check that your O2 mV are some 4.8x your air mV. PITB.

Mike448 · 7th February 2008, 22:36

Hi Guys. This thread is now 5 pages long but sadly very few cool user mods listed. As a brand new Meg owner, I was hoping to pickup some useful tips/mods from you experienced guys. Surely ya'all must have made a host of interesting and useful changes to your Megs?

Cheers
Mike

brandonmc · 7th February 2008, 22:47

Net mage: thank you for clarifying.

Gilles: I think I understand what you are saying but say you only have 1 point calibration and check that they are linear... what do you do if they are not (linear)?? Isn't this where the 2 point calibration comes in, to correct for non-linearity? Obviously this is only "correcting" in the range between 0.21-1.0 (or whatever calibration range) and could still be "off" outside that range. I don't see how a 1 pt calibration at high PPO2 would be better since wouldn't your second point still be 0,0? This still wouldn't help you above 1.0 (or your max PPO2). Or are you saying since you will typically be operating at higher PPO2's that you would rather calibrate and be close in this range then at low PPO2?

Or is my understanding completely off? Sorry for the off topic rambling.

Dave Faye · 7th February 2008, 23:04

Quote: (Originally Posted by Mike448)

Hi Guys. This thread is now 5 pages long but sadly very few cool user mods listed. As a brand new Meg owner, I was hoping to pickup some useful tips/mods from you experienced guys. Surely ya'all must have made a host of interesting and useful changes to your Megs?

Cheers
Mike

Right on Mike. I started this thread over a year and a half ago and we still get mostly off-topic posts.

Hijackers!!

**Padipro** · 8th February 2008, 00:54

Ok so I'll be the first one to post an actual mod with a picture.

It's not a wild OMG that's fantastic kind of mod just one that I thought made more sense.

I didn't like the way the O2 injection hose curved out then curved back in to the quick disconnect so I shortened the hose from the first stage and installed a 90 degree elbow so now the hose routing is straight down to the first stage with no bend in the hose.

quickean · 8th February 2008, 01:07

Get some dive time in first. Make changes if you need them later. It'll probably save you a good amount of money in the long run. Take my word for it!
Not really a Meg-mod, but I would recommend sidemounting your bailout as a possibility if you don't already. Nice and out of the way - feels like you're barely wearing anything.

Quote: (Originally Posted by Mike448)

Hi Guys. This thread is now 5 pages long but sadly very few cool user mods listed. As a brand new Meg owner, I was hoping to pickup some useful tips/mods from you experienced guys. Surely ya'all must have made a host of interesting and useful changes to your Megs?

Cheers
Mike

7th February 2008, 15:47	#41 (permalink)
netmage Tim Owens Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Coconut Creek, FL Posts: 520	Re: What Changes Would You Make to A Meg? Quote: (Originally Posted by brandonmc) huh?? http://www.customrebreathers.com/APE..._5%20rev_A.pdf Page 12...
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7th February 2008, 16:11	#42 (permalink)
brandonmc Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2006 Location: Maryland Posts: 102	Re: What Changes Would You Make to A Meg? Sorry, I'm still not sure what you are saying? How is it not a 2 point calibration? It was my understanding that if you had something other than air connected at the "at ambient air step" calibration would be off (at least on apecs 2.5 which I am more familiar with), and I have actually witnessed this happen... __________________ http://www.downtoolong.com/
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7th February 2008, 17:15	#43 (permalink)
netmage Tim Owens Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Coconut Creek, FL Posts: 520	Re: What Changes Would You Make to A Meg? Quote: (Originally Posted by brandonmc) Sorry, I'm still not sure what you are saying? How is it not a 2 point calibration? It was my understanding that if you had something other than air connected at the "at ambient air step" calibration would be off (at least on apecs 2.5 which I am more familiar with), and I have actually witnessed this happen... It's still two point calibration, just the air calib confirmation is removed from user interface... Calibration window ends two minutes after power on, I suppose the assumption is the head is not yet attached, therefore exposed only to ambient air...
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7th February 2008, 20:36	#44 (permalink)
tibby untitled Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: May 2007 Location: Salt Lake City, UT Posts: 338	Re: What Changes Would You Make to A Meg? Quote: (Originally Posted by netmage) It's still two point calibration, just the air calib confirmation is removed from user interface... Calibration window ends two minutes after power on, I suppose the assumption is the head is not yet attached, therefore exposed only to ambient air... ...so be sure not to have the O2 or head only cal kit connected to the head when entering the calibration screen. Been there, done that... Tibby __________________ Does the voice of reason change when you add helium to the mix?...hmm
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7th February 2008, 21:44	#45 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: What Changes Would You Make to A Meg? Quote: (Originally Posted by netmage) It's still two point calibration, just the air calib confirmation is removed from user interface... Calibration window ends two minutes after power on, I suppose the assumption is the head is not yet attached, therefore exposed only to ambient air... This is no improvement from the original 2 point cal system. If it was a more advantageous high FO2 cal protocol, one can simply check the cell linearity by exposing the cells back to air (following an O2 or other high FO2 calibration) and check that the cells indeed all fall back to 21%. By having any kind of air cal step, this effect gets masked, and you need to check that your O2 mV are some 4.8x your air mV. PITB. __________________ Gilles http://www.dirrebreather.com Last edited by Gilles : 8th February 2008 at 05:06.
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7th February 2008, 22:36	#46 (permalink)
Mike448 Mike O'Neill Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Apr 2007 Location: Knysna (South Africa) & Florida Posts: 41	Re: What Changes Would You Make to A Meg? Hi Guys. This thread is now 5 pages long but sadly very few cool user mods listed. As a brand new Meg owner, I was hoping to pickup some useful tips/mods from you experienced guys. Surely ya'all must have made a host of interesting and useful changes to your Megs? Cheers Mike
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7th February 2008, 22:47	#47 (permalink)
brandonmc Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2006 Location: Maryland Posts: 102	Re: What Changes Would You Make to A Meg? Net mage: thank you for clarifying. Gilles: I think I understand what you are saying but say you only have 1 point calibration and check that they are linear... what do you do if they are not (linear)?? Isn't this where the 2 point calibration comes in, to correct for non-linearity? Obviously this is only "correcting" in the range between 0.21-1.0 (or whatever calibration range) and could still be "off" outside that range. I don't see how a 1 pt calibration at high PPO2 would be better since wouldn't your second point still be 0,0? This still wouldn't help you above 1.0 (or your max PPO2). Or are you saying since you will typically be operating at higher PPO2's that you would rather calibrate and be close in this range then at low PPO2? Or is my understanding completely off? Sorry for the off topic rambling. __________________ http://www.downtoolong.com/
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7th February 2008, 23:04	#48 (permalink)
Dave Faye Know the wreck below? Current Rebreather/s: Evolution Other Rebreather/s: Inspiration Classic Evolution Megalodon Join Date: Oct 2005 Location: Boston Posts: 167	Re: What Changes Would You Make to A Meg? Quote: (Originally Posted by Mike448) Hi Guys. This thread is now 5 pages long but sadly very few cool user mods listed. As a brand new Meg owner, I was hoping to pickup some useful tips/mods from you experienced guys. Surely ya'all must have made a host of interesting and useful changes to your Megs? Cheers Mike Right on Mike. I started this thread over a year and a half ago and we still get mostly off-topic posts. Hijackers!! __________________ Dave http://www.Bostondeepwrecks.com http://www.Fayelaw.com
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8th February 2008, 00:54	#49 (permalink)
Padipro Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Nov 2006 Location: South Florida Posts: 231	Re: What Changes Would You Make to A Meg? Ok so I'll be the first one to post an actual mod with a picture. It's not a wild OMG that's fantastic kind of mod just one that I thought made more sense. I didn't like the way the O2 injection hose curved out then curved back in to the quick disconnect so I shortened the hose from the first stage and installed a 90 degree elbow so now the hose routing is straight down to the first stage with no bend in the hose. __________________ Scott IANTD Megalodon IANTD Trimix TDI Adv Nitrox and Deco PADI MSDT It could be that the sole purpose of your life is only to serve as a warning to others. Before you attempt to beat the odds, be sure you could survive the odds beating you.
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8th February 2008, 01:07	#50 (permalink)
quickean Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Mar 2006 Location: Michigan Posts: 131	Re: What Changes Would You Make to A Meg? Get some dive time in first. Make changes if you need them later. It'll probably save you a good amount of money in the long run. Take my word for it! Not really a Meg-mod, but I would recommend sidemounting your bailout as a possibility if you don't already. Nice and out of the way - feels like you're barely wearing anything. Quote: (Originally Posted by Mike448) Hi Guys. This thread is now 5 pages long but sadly very few cool user mods listed. As a brand new Meg owner, I was hoping to pickup some useful tips/mods from you experienced guys. Surely ya'all must have made a host of interesting and useful changes to your Megs? Cheers Mike Last edited by quickean : 8th February 2008 at 01:13.
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