Mk25/S600/R390 suitable for 50% O2 Mix?
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Wijbrandus
Contributor
Best I can find on the Scubapro website -
"Optional Kit Makes MK25 Compatible With Up To 100% Oxygen."
I don't see anything more specific than that. When I bought my mk25/G250, I was told it was good to 50% EANx, but since I'm not certified on nitrox yet, it hasn't been a concern.
"Optional Kit Makes MK25 Compatible With Up To 100% Oxygen."
I don't see anything more specific than that. When I bought my mk25/G250, I was told it was good to 50% EANx, but since I'm not certified on nitrox yet, it hasn't been a concern.
Michael Freeman
Contributor
My understanding is they are all good up to 40% and that the SP s600 and R390 can be set up and O2 cleaned for higher PPO2.
outlaws
Contributor
Scubapro makes an O2 kit for the Mk25. But out of the box it is only good to 40%. With the kit and proper cleaning it will be good to 100%.
Dive Safe, Dive Often,
Butch :scubadive
Dive Safe, Dive Often,
Butch :scubadive
Blackwood
Contributor
Sorry to revive a dead thread, but I have a related question.
When alternating between rec nitrox (F02<0.40) and air, does the MK25/S600 have to be O2 cleaned?
Is it imperitive to have it serviced before using Nitrox if it has been used with Grade E air?
I can't find any related info on ScubaPro.com, so any help is appreciated.
When alternating between rec nitrox (F02<0.40) and air, does the MK25/S600 have to be O2 cleaned?
Is it imperitive to have it serviced before using Nitrox if it has been used with Grade E air?
I can't find any related info on ScubaPro.com, so any help is appreciated.
It depends on the quality of the Grade E air.
The CGA Grade "E" standard allows 5mg per cubic meter of hydrocarbons while "oxygen compatible" air considered compatible for use in partial pressure blending of nitrox or for use in tanks that may be exposed to 100% O2 during partial pressure blending has maximum of only .1mg per cubic meter of hydrocarbons.
Most shops post the results of their most recent air tests so should be able to check to see how the air stands with regard to hydro carbons. Most shops that sell nitrox, also sell O2 compatible air.
Ideally, shops will test their air just before changing out the old filters. Testing on a new filter, does not tell you much about the quality of the air just before the filter is due for a change. The test should also be less than 6 months old.
In short, if you are using O2 compatible air, no new O2 cleaning is required before switching to nitrox again.
The CGA Grade "E" standard allows 5mg per cubic meter of hydrocarbons while "oxygen compatible" air considered compatible for use in partial pressure blending of nitrox or for use in tanks that may be exposed to 100% O2 during partial pressure blending has maximum of only .1mg per cubic meter of hydrocarbons.
Most shops post the results of their most recent air tests so should be able to check to see how the air stands with regard to hydro carbons. Most shops that sell nitrox, also sell O2 compatible air.
Ideally, shops will test their air just before changing out the old filters. Testing on a new filter, does not tell you much about the quality of the air just before the filter is due for a change. The test should also be less than 6 months old.
In short, if you are using O2 compatible air, no new O2 cleaning is required before switching to nitrox again.
Blackwood
Contributor
hmm... I've used air fills from a boat that I doubt are the cleanest things in the world. I suppose I should get it cleaned.
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