What is this sound my reg is making?

[bhagelin]

Hi all, I have an AquaLung Mikron reg that I've been using for about 1.5 years now. From time to time is has made a strange noise on inhale (a clacking type sound), the first time I noticed it was about a year ago and have had it serviced since then but it is still making the noise. It tends to be more prevalent at depth (40+ ft).

Here is a video of me diving with it where you can hear the noise. Go to the 1:20 mark in the video and you can hear it on inhale.

Molokini Hawaii DiveVideo - YouTube

Thanks for any insight into what this may be.

Brian

 

[whaylonsmithers]

I suggest you put this in the regulator section.

 

[KD8NPB]

Possibly the diaphragm smacking in to the demand lever?

 

[buddhasummer]

Could the lever be set too low?

 

[bhagelin]

Thanks for the replies, is there an inspection I could do to test if the demand lever setting?

Whylonsmithers, how do I move this thread to the correct forum? Or perhaps a moderator can assist..

 

[KD8NPB]

Thanks for the replies, is there an inspection I could do to test if the demand lever setting?

Whylonsmithers, how do I move this thread to the correct forum? Or perhaps a moderator can assist..

The Mikron uses a balanced downstream valve, similar to the Apeks TX/ATX/XTX, AL Titan LX, and AL Legend series of regulators.

It's kinda a PITA to adjust the lever height.

As long as the breathing resistance feels good (~1.0-1.5" H2O on a magnehelic) and you can get a nice full purge when you hit the diaphragm cover, I wouldn't worry about it too much.

It may require adjustment in about 35-50 dives.

 

[Nemrod]

Check IP.

N

 

[bhagelin]

Hi Nemrod, what does "IP" stand for?

Thanks, Bria

 

[Pedro Burrito]

what does "IP" stand for?

Intermediate Pressure. That's the pressure that the first stage reduces the tank pressure to. Depending upon the first stage, it's set somewhere around 120 psi to 145 psi.

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[bhagelin]

Posted a more recent video of this issue, where the noise is more audible

RegNoise - YouTube