Apeks adjustment question

[Dan Watkins]

I have about six dives on a new Apeks DS4/XTX 50. I was monkeying around with the various manual adjustments and I found that I could not really tell any difference breathing if the venturi switch was on + or -.

I also found that I just crank the inhalation adjustment knob all the way out is fine. This weekend I was using a scooter in a quarry and even scootin' around under water I did not find that I needed to back off the knob at all.

If I crank the knob in I do notice minor changes in inhalation effort.

I was just curious, do most of you with Apeks regs just dive with the venturi selector in the + position, and the inhalation adjustment turned completly out to the stop?

 

[ianr33]

I just leave the venturi on - agree it seems to have very little effect on breathing effort.

I adjust the inhalation knob to make it easy to breathe when in my mouth. When I take it out e.g.at a gas switch I wind it in a couple of turns to avoid freeflows

When correctly adjusted your regs should freeflow (in air) when you press the purge with the venturi on + and the adjustment knob out all the way

 

[Dan Watkins]

Okay, I just tried mine (it is a new unit so it has never been serviced except for original factory setup). On + with the adjustment knob all the way out, if I hit the purge button, it will exhaust, when I let go, it stops. It does not free flow.

Does this mean my regs are not tuned properly?

 

[ianr33]

Does this mean my regs are not tuned properly?

Yes,that would be my understanding.

From the Apeks service manual:

<<8. Move the venturi lever to the "MAX" position and depress the purge button sharply. This should initiate a strong, continuous freeflow that can be eliminated by turning the venturi lever back to the "MIN" position. >>

I downloaded the manuals from somewhere on the web. Let me have your Email and I will send you the pdf

 

[SparticleBrane]

With my Apeks XTX50/DS4 combo I can tell a difference between the + and -, and the adjustment knob.

 

[Dan Watkins]

I'd be curious, those of you who have an Apeks regulator, can you cause it to freeflow in air after depressing the purge when the adjustment knob is all the way out and the venturi selector is in the + position?

I just want to hear back from a bigger sampling of people before I head back to the LDS saying mine isn't tuned right.

 

[PhilEllis]

I'd be curious, those of you who have an Apeks regulator, can you cause it to freeflow in air after depressing the purge when the adjustment knob is all the way out and the venturi selector is in the + position?

I just want to hear back from a bigger sampling of people before I head back to the LDS saying mine isn't tuned right.

If the regulator is properly tuned and the venturi is working properly, it MUST freeflow wildly when the venturi is in the + position. Otherwise, there is no venturi action, negating the entire point of the adjustment.

Phil Ellis

 

[diver4life]

I can tell the difference, the deeper the more pronounced.
Regards,
Doug

 

[Dan Watkins]

If the regulator is properly tuned and the venturi is working properly, it MUST freeflow wildly when the venturi is in the + position. Otherwise, there is no venturi action, negating the entire point of the adjustment.

Phil Ellis

And then switching to the - position should stop it?

On mine as soon as I release the purge button, the air flow immediatly stops.

 

[ShakaZulu]

Try the same breathing exercise at 120ft....hmmm.