ReikiMaster(Offline)

Ok, i currently have
2 x Cyklon 5000
1 x Extreme Deep
all of which i like (i do love the side exhaust)

but now that i have twins and a stage i want all my regs to be the same, the choices i have are

a) flog the deep, and get another cyklon 5000
b) flog the lot and get all new regs (probably atx 40/50's with DS4, and a nitrox set for the stage)

is there anything wrong with the 5000's?

__________________
Steve

JohnKendall(Offline)

You're not going to get the kind of answer I think you want. Posidons are not DIR complient.

My advice would be to flog the lot and replace them with Apeks or scubapro.

HTH
J

ReikiMaster(Offline)

cheers John,

the question is why are the 5000's not DIR complient? what does DIR believe is wrong with them?

__________________
Steve

JohnKendall(Offline)

I'll give this a go, However I do not have any experience of Posidon regs, so if I get something wrong, please correct me.

As I understand it, most if not all of the posidon regs are upstream regs. This means that if a failure occurs it will not give you gas. (and certainly those posidon regs I have seen start freeflowing when you get below a certain pressure)

Because of this upstream design there has to be an overpressure valve in the system somewhere, normally I believe it's in the hose. This OPV is a failure point, not helped by the fact that if the 1st stage IP creaps up, then the 2nd stage will lock, and the OPV will burst. Now you can't breath any of the gas.

They just seem far to complicated for something that you are relying on to keep you alive in an alien environment.

HTH
John

JohnKendall(Offline)

I have thought of a bit more:

Due to the OPV in the hose, the hoses are custom to posidon regs. This means that your spares are different to the rest of the team (at this point I'm thinking about the Global team)

I don't know if it is the case with the cyklon 5000, but I believe that a lot of the posidon regs have higher IPs and also have a somewhat hard air flow. This is a design feature as they are primarily designed for Deep Air diving. Now with Helium you don't need that feature, and it just causes you a bigger freeflow risk (The higher airflow out of the 2nd stage gives you less time to deal with a freeflow)

HTH
John

Rob Andrews(Offline)

I also stand to be corrected but I'm sure i read somewhere there's an issue with them if you need to take some part of them apart under water. A pin gets bent (possibly the OPV discussed above) when the reg is re-pressurised and the air forces water out of the hose that may have got in during stripping.

This may well be less of an issue now as I believe GUE no longer insist on finger tight hoses for wreck diving.

Tricky(Offline)

Steve,

there's a pdf linked in this post on YD that covers reg choice from a DIR perspective. It explains why Poseidons are not suitable. Unfortunately it wasn't able to answer some of my questions regarding Apeks vs. Scubapro

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PBrown(Offline)

The Cyklon 5000's are not an upstream reg, however they are not DIR:

non-standard hose sizes so incompatiblity within the team (unless of course the whole team is using them)

unable to strip the 2nd stage down underwater

high interstage pressure with potential for freeflows

All of the above can be dealt with, but it's simply easier to change the whole reg (or at least the 2nd stage & drop the IP).

The bit about the pin being damaged would be for a Jetstream 2nd stage (which are an upstream reg).

cheers,
Paul