Regulator and Air Integration Question for Doubles/Twinsets

[RJP]

One work around that I have seen is use a short myflex hose and secure the transmitter between the cylinders near the neck area.

Would that be the Miflex HP hoses that seem to fail with alarming regularity?

 

[Scott]

Would that be the Miflex HP hoses that seem to fail with alarming regularity?

I did say work around, not best solution. :mooner:

Agree a better work around would be a short regular type HP hose.

 

[RJP]

I did say work around, not best solution. :mooner:

Agree a better work around would be a short regular type HP hose.

Or no extra hose. I'm not a fan of putting a transmitter on ANY hose. Nothing good can come of it.

 

[DeepSeaExplorer]

I dive with a transmitter on the right post and an SPG on the left. (Don't tell my DIR friends.) This way, should I need to isolate the manifold I can still read accurate pressure on whichever tank I'm still breathing.

I do the same, but for a different reasons. I like several AI features, like dive time remaining, automatically calculating SAC, etc. I simply remove the transducer for tech dives.

 

[ajduplessis]

Hi,

I am learning and honing my skills on my single rig setup at this time, however I am academically still learning from your experiences on double/twin-set kit setup. I have two questions if you could shed some light on for me.

1. Do you use Octo's with Doubles? I assume no since you have a built in redundant first stage off of your isolator manifold along with your other second stage. If you got into a 1st/second stage failure on the one side then you could isolate it off to only use your working 1st/2nd. Are Octo's even used in Doubles?

2. Air Integration - Currently I have two dive computers that are both air integrated and I have one transmitted on my singles kit. It works great transmitting to both computers no issues. If you move to doubles then you now have two 1st stages to deal with. Does that mean you double up on transmitters and then now having two live computers (one for one transmitter and the other for the second transmitter) vs. a redundant pair? Or do you only use one transmitter on one 1st and thumb the dive if something happens on the transmitter? Or do you not use Air Integration with doubles?

Sorry for the possible dumb questions, but I began to think about this during lunch and figured I would ask vs. guessing.

Thanks!

1. Rather than using the term Octo, replace it with “backup second stage”. A backup is normally the same quality device you have as primary. Your primary second in on you right post. The backup is on the left post. If you have stage problems you shut down the relevant post (stage) only, not the isolation valve. You only shutdown the isolation valve when you have issues with the isolation valve or barrel o-ring.
2. You can use a single transmitter on your right port that pairs with both your computer. You should have a SPG on your left post, thus in a transmitter failure scenario you still have a working SPG, or the reverse, you will have the AI as working when the SPG fail. I generally don’t use a transmitter when doing deco dive as it is of zero use and an addition failure point.

 

[DevonDiver]

I do the same, but for a different reasons. I like several AI features, like dive time remaining, automatically calculating SAC, etc. I simply remove the transducer for tech dives.

Why would a qualified tech diver need to be told these things?

Dive time remaining (based on gas). What use is that on a pre-planned tech dive? Wouldn't you already be calculating your gas requirements prior to the dive?

SAC. Show me a tech diver that doesn't know their regular and accelerated SAC...and I'll show you a diver that shouldn't be tech diving.

Wouldn't you apply you existing knowledge, skill and procedures - as a tech diver - onto all of your (non-tech) dives?

 

[Peter_C]

Years ago I tried adding a transmitter onto my doubles and quickly removed it. With SP MK25 1st stages no matter where I put the transmitter it snagged on something. Often times it snagged on the hose connected to the reg stuck in my mouth. Very annoying as it pulled it out of my mouth. Removed the transmitter and do not miss it. I have never used the computer for remaining bottom time by air, only for NDL. Plus when I first went BP/W at around 25 dives, I added in a hip mounted gauge, so I was already used to using it for pressure readings. I also found the transmitter connection sometimes failed when scootering.

 

[Peter Guy]

ajdup... wrote that the addition of a transmitter was "an additional failure point." Hmmm, not so convinced. I have a transmitter on my right post, points down and is NOT any sort of entanglement hazard. (If it gets entangled I would have a lot more problems than just this!) But anyway, the transmitter has a single plug which replaces the single plug in the HP port. Am I not just trading one plug for another? If so, how is that "an additional failure point?"

Why do I have a transmitter on my doubles? Just because I had a transmitter available and, I will confess, it is easier just to look at my wrist to get my pressure while I'm also getting depth and time. It is necessary? No, of course not. Is it useful? I think so.

 

[DevonDiver]

Why do I have a transmitter on my doubles? Just because I had a transmitter available....

I think this is the crux of it.

If you already have a wireless or AI computer.... then why not use it?

If you don't already have a wireless or AI computer...and will be making a purchase... then there are good reasons to opt for a simple SPG and wrist mounted computer...

Whilst 'best practice' is great.... having to go out and replace your scuba kit to achieve it can be impractical and needlessly expensive for recreational diving.

 

[RJP]

But anyway, the transmitter has a single plug which replaces the single plug in the HP port. Am I not just trading one plug for another? If so, how is that "an additional failure point?"

Take your transmitter apart and count the other o-rings and seals...