Re: Poseidon Cyklon 300 IP

Lee Bell wrote:

"James" wrote


I have a Cyklon 300 I bought several months ago, got back from being rebuilt about a month ago. I just received yesterday an IP Gauge that you hook onto your BC hose and when I turned the air on my 3500 psi tank, it reads 150 psi. I had been told that the IP for this Cyklon, first stage is the model 3070, was set at about 174 psi.


I've never owned a Poseidon regulator, but 174 psi is significantly higher than the IP in any of the regulators I have owned. For that matter, so is 150 psi.


I was wondering will the IP change depending on the pressure in my tank?


Not if your first stage is working properly. The whole point of the first stage is to maintain a constant IP as long as the pressure in the tank is the same or higher than that IP.

The Cyklon 300 is a membrane operated unbalanced for supply pressure first stage. Water pressure and the big spring are balanced directly by the closing spring and bottle pressure, at the other side of the piston. If the bottle pressure drops, the difference in pressure created by demand, has an easier job of actuating the membrane/pushrod/piston mechanism.


Will the 174 occur at a lower tank pressure?

Nope.

Yes.


I have dove this regulator about three time so far and everything seems fine. The second stage primary is the metal housing kind,
which when serviced was taken of an early 2305 first stage, and my Octopus is the yellow plastic with black hockey puck.


If it seems fine, it probably is fine.

Yep. One has to keep in mind, though, that the second stage has to be adjusted while supply pressure is at 20 bars, to prevent low supply freeflow.
If you have a balanced ( for supply pressure variations) first stage, you'll have a stable IP, and may set it to anything between 9-10,5 bar. The second stage will work just as fine.
Side note: Part of the condemnation of Poseidon regs by the DIR crowd is that they claim the second stage to operate upstream. This, of course, is not true for the 300 second stage.

If it worries you, though, ask the tech that rebuilt it or the one that will service it the next time.

I hope he will get the right answer...

Matthias

.

Relevant Pages

  • Re: Poseidon 300
    ... your BC hose and when I turned the air on my 3500 psi tank, ... I had been told that the IP for this Cyklon, first stage is the model ... depending on the pressure in my tank? ...
    (rec.scuba.equipment)
  • Re: Practical questions from a new Reg/BCD buyer
    ... that is, if I buy, say an Apeks first stage, ... There are at least two different hose sizes used in regulators. ... Of more concern is intermediate pressure. ... is the connection to the BCD standard? ...
    (rec.scuba.equipment)
  • Re: Oxygen cleaning question
    ... it up and check the pressure on a tank. ... in there (primarily the first stage is of concern). ... that heat from the oxygen flowing can set it off. ... Proper cleaning of the cylinder, valve and regulator should be done to ...
    (rec.scuba.equipment)
  • Re: Regulator, first stage and housuses compatibility
    ... >> BCD from SeacSub, use gauge from other ... as far as the first stage is concerned. ... > using the same intermediate pressure can degrade the performance of the ... > adjusted to match the intermediate pressure of the second stage, ...
    (uk.rec.scuba)
  • Re: Poseidon Cyklon 300 IP
    ... stage is to maintain a constant IP as long as the pressure in the tank is the same or higher than that IP. ... I was using balanced first stage regulators long before I had an idea how one actually worked, but my first regulator was an unbalanced diaphram Aqualung. ... If the IP got higher as pressure in the tank became lower, the regulator should have breathed easier as pressure in the tank neared normal IP pressure. ... This, of course, is not true for the 300 second stage. ...
    (rec.scuba)