Question Regulator Tuning

[dmaziuk]

Try them with closed venturi and see if it works for you.

Mikrons don't have a venturi lever, at least my ACD doesn't.

 

[kdlv]

Ah true, my mistake, apologies!

 

[dmaziuk]

Ah true, my mistake, apologies!

No worries, but I can't answer OP's question: I don't think I ever opened one to 88%. In fact I dive with the knob fully closed and maybe have opened it 15-20 degrees once or twice... so for all I know mine will freeflow too if I open it 90% of the way.

 

[ciocanul]

Mikrons don't have a venturi lever, at least my ACD doesn't.

The Mikron does not have a continuously adjustable venturi, it has a removable one, in the form of an fixed angled deflector that you can assemble parallel to the airflow or slanted, or more towards or away from the mouthpiece. And this adds for me an entire level of complexity to an already impossible to adjust second stage. Do you have any hints on how to properly mount the said deflector? (I have managed to adjust it acceptably and it has been working without issue for 50 dives now, but I don't know if I did it "right")

 

[dmaziuk]

I don't. I haven't taken mine apart and am not planning to anytime soon, either.

 

[Nemrod]

The SM does not address the fixed Venturi vane and unfortunately seems too large to upload the SM. Look close at the pic, the vane is oriented directly down the mouthpiece tube and there is an arrow on top (left in photo) showing orientation.

 

[ciocanul]

The SM does not address the fixed Venturi vane and unfortunately seems too large to upload the SM. Look close at the pic, the vane is oriented directly down the mouthpiece tube and there is an arrow on top (left in photo) showing orientation.

Thank you! Now I see that it has "top" and and an arrow written on it, making it foolproof (at least mostly, not in my case).

 

[Scoooter961]

I did not see the need to man-splain IP especially since she is working with a store who did the service.

Every diver needs an IP gauge they can plug into their BC inflator hose and familiarize themselves with what the IP should be for their regulator.

Last time I explained in detail how to adjust the orifice in a second stage there was a collective meltdown as I was going to cause the diver to kill himself.

I do not think the second stage needs to be adjusted, I do think the IP needs to be checked and possibly turned down to the lower end of the range and use the adjustment knob on the second stage to increase cracking force. But, that is what I think from the information provided, others can think differently.

I am almost afraid to make a blanket statement, well, actually I am, but will anyways. Any second stage that does not free flow when the purge is depressed to initiate flow is probably going to suck.

I didn't die.... if you were talking about our conversation.

 

[Nemrod]

I didn't die.... if you were talking about our conversation.

I am glad to hear that . All the weight put on my shoulders I was expecting PADI or some other ABC organization or even the SCUBA Police to arrive at my door step and rendition me to some awful place. Wait, I already am in an awful place (for diving) so at all of them .

 

[Luiz Laba]

Hello all.

I just got my regulator back from being serviced. When the second stage venturi valve is at least 88% open, the second stage will get stuck in free flow if the purge valve is activated. I was told that this is the desired behavior by the shop.

The opening effort is supposedly 1.2 inches of water. The octo is 1.6 and doesn't free flow at all. I am not sure that I am comfortable with this setting that free flows on the primary second stage.

Any thoughts? Does that sound right regarding tuning? Aqualung spec is 2.8-3.8 mbar (1.1-1.5 in h2o). Is there another spec I should check? It is a warm water mikron reg with which I dive in 50F water usually without a problem.

Not a good experience, I would close the venturi to avoid that, it is normal to some regulators.
I see other messages, so I will not duplicate.
Take care,
LCL