Transmitters on Short Hoses?

[J-Vo]

I assume it's "D-Ring".

I was using button gauges with my transmitters until my cave instructor convinced me they were more of a liability then transmitters alone.

 

[hedonist222]

I assume it's "D-Ring".

I was using button gauges with my transmitters until my cave instructor convinced me they were more of a liability then transmitters alone.

curious

why are button gauges a liability when regular SPGs are acceptable?

 

[bradymsu]

curious

why are button gauges a liability when regular SPGs are acceptable?

The concept is to add as few potential failure points as necessary. Only a single SPG or transmitter per tank is necessary. If it fails, you turn the dive. Diving within the Rule of Thirds, you'll always know you have enough gas for the exit. An additional SPG or button gauge shouldn't be used "for redundancy" as it's another potential failure point. Failure point is interpreted to mean a potential entanglement point as well.

 

[Paul M]

I assume it's "D-Ring".

I was using button gauges with my transmitters until my cave instructor convinced me they were more of a liability then transmitters alone.

In that case, I won't have a problem with that gauges being caught in my D-rings.

 

[hedonist222]

The concept is to add as few potential failure points as necessary. Only a single SPG or transmitter per tank is necessary. If it fails, you turn the dive. Diving within the Rule of Thirds, you'll always know you have enough gas for the exit. An additional SPG or button gauge shouldn't be used "for redundancy" as it's another potential failure point. Failure point is interpreted to mean a potential entanglement point as well.

I see
but otherwise button gauges function as reliable as an Spg?

 

[tursiops]

"into my drink"?

Hmmm.....I'm guessing "d-rings"

 

[Paul M]

I see
but otherwise button gauges function as reliable as an Spg?

Mine are.

...and having a SPG on a 6in hose has two connections just as having mini spg and tranmitters connected to the reg creates two connections.
...one could also say that an spg dangling from a 6in hose can entangle easier than a tiny 3/4in button guage or 2.5in transmitter.

 

[bradymsu]

I see
but otherwise button gauges function as reliable as an Spg?

No. Button gauges don't belong on sidemount tanks. Button gauges are difficult to see underwater. People typically put them on their first stages when they are using a transmitter to be able to quickly view their gas pressure on land without having to connect to their computer. Of course this isn't a law and divers are free to do whatever they want with their gear. But if you're diving sidemount for a course, it would be common for the instructor to advise either using a SPG or a transmitter, not both, and not button gauges.

 

[Paul M]

No. Button gauges don't belong on sidemount tanks. Button gauges are difficult to see underwater. People typically put them on their first stages when they are using a transmitter to be able to quickly view their gas pressure on land without having to connect to their computer. Of course this isn't a law and divers are free to do whatever they want with their gear. But if you're diving sidemount for a course, it would be common for the instructor to advise either using a SPG or a transmitter, not both, and not button gauges.

Our TDI/IANTD Cave instructor, with decades of experience exploring and training, had no concerns with our setup during his inspection of all of our gear on day one of training.
The numbers on these button gauges are the same size text (and easy to read) as much of the text on the Perdix. They are a back up. If they are ever 'needed' I am already exiting, just the same as I am forced to exit if my primary light fails and I am using a small backup light. The dive is over.
Still comforting to see how much air you have.

 

[Scuba Client]

I'm getting ready to set up my first sidemount regs. For my sidemount course, my instructor had me try SPGs in the various positions. Being a technophile, I'll be resolving SPG placement issues by using two transmitters for my Perdix AI instead of SPGs.

What I'm unsure of is whether the transmitters should go directly on the first stages pointing down or placed on 9" (23cm) hoses and tucked under the top band. For backmount, I recognize that putting the transmitter directly on a first stage increases the chances of it being broken off due to negligent handling. But in sidemount, it seems like it would be in a somewhat more protected position than backmount. A direct connection eliminates additional failure points. It also decreases the gap between the transmitter and the computer.

What's your thoughts/personal practice?

I think you already understand the negligent handling of stages. Piranha Dive Manufacturing has 4 inch SPG hoses.