COPIS MEG and VR3 Deco

scubagrunt

AGAIN; Without opening a HUGE CAN OF WORMS here! your best advise to any potential buyer is to contact ISC for advice and to contact Shearwater for advice and then make your own personal informed decision!

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robvdmr13

Wouldn`t it be possible (and veasible) to use something like this to connect a shearwater or VR3 to the COPIS to get actual redundancy? That could make the COPIS a true expedition mCCR as for the rest it is a meg.

Robert

jradomski

done correctly...Yes

but just paralleling it (the normal installation) does nothing for redundancy and may statistically increase the chance of a failure..

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bgpartri

It's not quite that simple. For example, if one of the devices has some other failure mode like a short battery life, having a second device that has a long battery life can increase overall redundancy.

It is important to look at various failure modes to determine whether redundancy is increased or decreased.

For most sensor failures like current limited sensors, wet sensor faces, wet sensor connectors, wet banana plugs, and broken sensor wires, isolation provides no benefit. All of the connected devices will be affected.

Even for a shorted device, it has to fail in a particular way to make all of the op-amps attack all of the sensors. I've never seen this in practise, but it could happen.

With rebreathers that only have one display, redundancy is increased unless you believe that cut wires that end up shorted is the most common failure.

Although resistor networks were common with analogue electronics, rnodern designs like the Inspiration, Meg and KISS use op-amp isolation as does the Shearwater.

If in the end you decide that shorted wires is what you are most worried about, the Shearwater works just fine stand-alone or on a fourth sensor.

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silentscuba

[quote=bgpartri;87424]
designs like the Inspiration, Meg and KISS use op-amp isolation as does the Shearwater.
quote]

What does this mean to the rest of us who are not up to speed on electronic engineering theory????

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fredrik

Could a Hammerhead be a option for you?

Monkey

I was thinking that the Hammerhead would be a great upgrade after I get some time on a COPIS rig...... and since I already own a VR3 its what prompted this question in the first place.

Blomman

What is the point in buying a "KISS-style rebreather" just to rebuild it to a eCCR? It sounds to me that you have bought the wrong rebreather from the beginning. It would be more logical to buy a standard MEG and then use your VR3 to keep track of deco.


// Blomman

henckell

One way of looking at it could be from an economical point of view. A COPIS plus HH is not much more expensive than a standard Meg plus a VR3, and it will have more capabilities and features.

If/When the Apecs 3 comes out it will probaly be the most expensive variant.

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Monkey

Cost for one. and frankly the fact that there have been zero deaths on mCCR tells me that is a good place to start....

I hate to use this analogy but a plane pilot has to learn to fly before engaging autopilot.....

I would think that mCCR for 100 hours then eCCR would be a good way to learn. starting out with a system that leaves any room for complacency could be a great way to get your ass biten.. But I am only speculating.