What Changes Would You Make to A Meg?

netmage

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

Page 12...

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...

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...

tibby

...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

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

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

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

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

Hijackers!!

Padipro

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

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.