I preach to always check o2 and CO, and I mostly inspect for them. The times I don't, are because the Cootwo discharges itself too quickly between dive trips, and sometimes it's just finicky and refuses to work right. For example, it wouldn't connect to the app for a year, then magically one day it started connecting again.
I've never found CO with this thing. The CO sensor was replaced a year ago and calibrated, it just always reads 0-1, unless I breathe in it or stick it in exhaust. But my tanks have always been 0-1, no big deal.
Today analyzing o2 on my o2 bottle, I didn't even notice the CO, but when I switched to check DIL, I noticed it was reading 16ppm!
I grabbed three other oxygen bottles, filled at atleast 3 different shops, along with two dil bottles and one bailout, and ran some tests that have my questioning if the Cootwo is going crazy.
That is:
-Calibrate in air. 20.9 o2, 0ppm co.
-Turn on o2 bottle, o2 starts climbing. When it hits mid 70's level, CO starts climbing, reaching 6-9ppm when O2 is done.
-Switch to a dil or bailout and as the o2 drops, CO typically jumps up to 13-16ppm, but then quickly drops. -When the O2 is at the expected value, the CO is 0 or max 1.
It's roughly repeatable between all of those bottles, and that pattern has my questioning if there is something funky going on. Because I inspect just before diving, I don't have labels on these to show that they were 0ppm co before, but I am relatively certain that all were inspected before and had 0, but I can't prove that.
But, I tried filling a gallon Ziploc baggie with some air from an o2 bottle. After letting it sit for a while, as without the tank pushing air through it, it takes longer to equalize...I had 3ppm co at 47% o2, 5ppm co at 67% o2, and that seems to support the fact that my o2 bottles do have some CO for whatever reason.
I took the unit apart and sprayed Deoxit on the contacts before this test.
Anyone else dove with 5-9ppm in rebreather o2? I will try to stop at a shop and use their CO analyzer to confirm if the cootwo is nuts.
I've never found CO with this thing. The CO sensor was replaced a year ago and calibrated, it just always reads 0-1, unless I breathe in it or stick it in exhaust. But my tanks have always been 0-1, no big deal.
Today analyzing o2 on my o2 bottle, I didn't even notice the CO, but when I switched to check DIL, I noticed it was reading 16ppm!
I grabbed three other oxygen bottles, filled at atleast 3 different shops, along with two dil bottles and one bailout, and ran some tests that have my questioning if the Cootwo is going crazy.
That is:
-Calibrate in air. 20.9 o2, 0ppm co.
-Turn on o2 bottle, o2 starts climbing. When it hits mid 70's level, CO starts climbing, reaching 6-9ppm when O2 is done.
-Switch to a dil or bailout and as the o2 drops, CO typically jumps up to 13-16ppm, but then quickly drops. -When the O2 is at the expected value, the CO is 0 or max 1.
It's roughly repeatable between all of those bottles, and that pattern has my questioning if there is something funky going on. Because I inspect just before diving, I don't have labels on these to show that they were 0ppm co before, but I am relatively certain that all were inspected before and had 0, but I can't prove that.
But, I tried filling a gallon Ziploc baggie with some air from an o2 bottle. After letting it sit for a while, as without the tank pushing air through it, it takes longer to equalize...I had 3ppm co at 47% o2, 5ppm co at 67% o2, and that seems to support the fact that my o2 bottles do have some CO for whatever reason.
I took the unit apart and sprayed Deoxit on the contacts before this test.
Anyone else dove with 5-9ppm in rebreather o2? I will try to stop at a shop and use their CO analyzer to confirm if the cootwo is nuts.