O2 Injection Rod O-Ring Placement

dnscarboro

I was instructed the same way= o-ring first up about and inch
then cartridge.

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carlcz

I know this is probably a silly question, but can the scrubber be used without the tube and o-ring?
The manuals for the Optima/EAC (I don't believe) do not show the tube and only relies on the red sealing cap.

Dsix36

Yes, they can be used without the rod. The red plastic cap MUST be used to prevent bypass of the cartridge.

The only thing that I ever noticed that was any different, is that there would be a slight PO2 spike at every injection of O2. It would level off very quickly and was never a problem.

I was instructed to use the rod for electronic injection and to remove the rod for flying the unit manually.

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phreaticus53

You can even dive it WITHOUT the ring...per Lamar,personal conversation.

diverreb

Don,

What's the logic behind that?
Why would it make a difference manual vs. electronic?

Richie

diverreb

You can also drive a car without wearing seat belts, but it's not a good idea.

Why would they use the O-Ring if it wasn't needed?

However, when I originally trained and lost the O-Ring, I was told by one of the DR guys that it wasn't a big of a deal if the O-Ring wasn't used. Then later on I was told that it should be used.....

Personally, if I lost the O-Ring and didn't have a spare I'd remove the tube & leave the red plug in place, as Don mentioned.

Richie

jiseson

doesn't that cause some cartridge by pass -? path of least resistance? same a channeling with sorb i would guess. does n't ring logical?

Dsix36

It doesn't really make any difference at all.

When flying electronicly without the rod, there will be PO2 spikes (setpoint of 1.2- - readings of 1.4) at each of the injections. This tapers to setpoint very quickly though. This is because the soleniod is firing O2 very closely to the sensors and it takes a couple of breathes to circulate the loop volumn.

When using the rod - the O2 is injected on the far side of the cartridge and must travel the loop before the sensors will register the change. The PO2 will stay much smoother without near as drastic of spikes.

manual = faster response from handsets, but with spikes
electronic = slower response without spikes

Manual will require much more frequent monitoring than electronic. when electronic the spikes can be a little unnerving to see a SP 0f 1.4 when expecting to see 1.2 (thus the use of the tube)

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Dsix36

I would definitely think so!!

There is NO way that I would dive without either the o-ring or the red cap in place.

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THE MORE THAT I LEARN, THE MORE THAT I STILL NEED TO LEARN!!!!!!