KISS....How does it work....

[Pierre Farrugia]

Can someone here tell me how a KISS RB works, does it only uses one mix ? Can it be used for trimix? What is it's depth rating?

Regards

Pierre

[Pierre Farrugia]

I think I got the answer !! So this is one mix CCR not a Ppo2 RB.

Weight with full 13 cu.ft. tanks, full scrubber, but no BC backplate or harness is 50 pounds (22.7 kg). It comes with a bailout integrated DSV. The three P02 displays each have their own housing, battery, and read only one sensor. Oxygen is added both continuously by a feed orifice, and manually as needed by pressing a button on the manual add valve body. The scrubber holds 6 pounds (2.7 kg) of 4-8 Sofnolime and is rated for 3 hours. Overall dimensions are 21"H 14"W 8"D (54X36X20 cm).

[KISSer]

www.jetsam.ca has got some info about how the KISS works - a good place to start.

Same as most CCRs - one cyl of O2, one of Dil. O2 is delivered by a regulator with a fixed interstage pressure and flows through a tiny orifice to give a constant flow of O2 at around 0.7-1.0l/min, the idea being that you match the O2 flow to your in-water resting metabolic rate to reduce the mount of O2 addition that is needed.

The original orifice was .004" or summat, which gave a flow of about 1l/min at an IP of around 9 bar (IIRC), so the unit would stop delivering O2 when ambient pressure reached that value, hence a depth limit of around 80m. KISS users then did their sums and found that a smaller orifice (.0035") will deliver 1l/min at an IP of around 11.5 bar, which is close to the maximum that the Apeks 1st stage can delive. Hence a 'depth limit' of around 100m for the KISS even tho it's been used successfully at 115 - 120.

There's a manual bypass button that lets you add O2 directly into the loop to achieve a set point or do O2 flushes. 3 independent wrist mounted PO2 meters let you know when you need to add a squirt of O2 to maintain your PO2 if you're working.

People have now started bolting all sorts of lectric thingummies to their KISSes - Hammerheads and suchlike, similar to the Inspiration. Personally the reason I went the KISS route was that there weren't any electronics, and I don't consider 100m to be a restrictive limit on my diving at present.

K

[Dominic]

So this is one mix CCR not a Ppo2 RB.

I may be misunderstanding, but the Kiss IS a fixed ppO2 rebreather...

[KISSer]

Originally Posted by Dominic

I may be misunderstanding, but the Kiss IS a fixed ppO2 rebreather...

You is mistooken. No ppO2 management apart from that done by the wet slushy stuff between your ears.

[Robert]

Pierre,
There's a lot of interesting stuff on the KISS here:
http://kiss-ccr.dyndns.org/home

HTH

Robert

[PrettyFishies]

Pierre

Does this mean you're reconsidering your YBOD purchase?

The beauty of KISS is that the diver makes the decisions regarding O2 not a computer - there is NO voting logic.

The voting logic on the YBOD automatically reads the two O2 sensors closest to each other in readings and assumes that to be your correct PPO2 - it then makes decisive actions based on this even if those two sensors are wrong.

I don't like voting logic.

Regards

AnneMarie

[Padowan]

So what about if you had a KISS and you had 2 duff cells - perhaps current limited, what sort of logic would you apply to this situation?

The only difference I see is that you would my not add O2 manually in the KISS, if you felt that you had already added a good deal or had taken the decision to run the unit on what YOU considered to be the only good cell - how would YOU know which cells were good and which bad?

If the YBOD was furiously injecting O2, cos of duff cells, if you're paying attention to things other than the handsets (like bouyancy changes, listening to the solenoid inject etc), surely you'd be able to react quick enough?

Surely at the end of the day you can run the YBOD manually if you feel that there are 2 duff cells?

A sensible question, but from a CCR virgin, so I expect to get some flak.....

[PrettyFishies]

"The only difference I see is that you would my not add O2 manually in the KISS",

With the KISS YOU decide - not the electronics.

I don't like voting logic or solenoids - it's better flying it manually.

[Pierre Farrugia]

Hello,

I am still more than convinced about the YBOD Among many things is that here in Malta you can find training and spares, which for me is very important. Also here at Strand, which is the supplier, knowing him, he will hand over spares and thnigs to get you going as he always did. Also I like the constant Ppo2. Also have so many unit sold and used by so many divers is a major plus. Also have a max depth limit of 180m is enought

Regards

Pierre