"Secondary" display for Vision units

decoweenie

Please note this discussion is specific to Vision electronic before commenting:

Has anyone here done an independent secondary display for the Vision yet that uses all 3 cells ?

I am not talking about plumbing a VR-3 to a 4th cell, but an independent digital display (i.e. Sartek, Subsea, COPIS) connecting PARALLEL to the existing 3 cells.

A while back, Jason M mentioned that he will look into it, but I don't think based on his delivery rate that he will be able to do so anytime soon...

That leaves only Sartek since the COPIS battery holder is too big to fit inside the Vision lid.

Or a Shearwater HUD...

caveseeker7

Haven't tried it, but the pO2 monitor/Rebreather Monitor from C2R and
the Hammerhead Secondary from Juergensen Marine might work, too.

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decoweenie

Sure.

I guess I am more interested in figuring out the best way to connect to the existing Vision cells.

The existing way to piggy-back the cells have been:

1. cramp the wires into the Molex connectors, or
2. have a switchbox (ala Hammerhead-style)

As you know, the Vision cells do not use Molex connectors so option (1) is out. That leaves the switchbox option.

So a possible way to put one together and still removable would be:

1. Get the narkedat90 Vision 4th cell adapter
2. Get a Hammerhead switchbox (if even available), or get John to build one.
3. Connect the display thru (1) and (2)

Beanie

Yeah been thinking about this too, not for the Vision but for classic with coax cells so same problem. the only solution thus far is a y cable which isn't the best.

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decoweenie

Why not ?

It should be similar to using a switch box...

Does anyone know if APD gets upset if the lid is sent back with the 4th-cell adapter still connected ?

If not, then an y-cable could be one of the easiest way for remoavble before sending back to APD - not that a switchbox is difficult either.

decoweenie

In case anyone is wondering why...

I try to add to all of my units an independent display for 2 reasons:

• a simple mean to double-check the primary controller. Not that I don't trust the controller, but having dived CCR for ~10 years taught me to "trust, but verify".
• a mean to use the unit as mCCR unit if the controller breaks down on long dive trips. On the Meg, I have added the COPIS handset and on the Shearwater-YBOD, I have added the Sartek display. The O2 injection is easily added thru the BMCL.

Depth-junkie

I use my VR3 with a 4th cell and a narked@90 cell holder, i honestly dont see why you need a display linked to 3 cells. If 1 cell VR3 is calibrated right it tracks perfectly inline even on dives lasting 3hrs. More than good enough for a get out of jail free card.

The only reason you will ever get to relying on just the one cell is a total elec failure of both controlers and need to run the unit manualy.

IMHO the more likely faults would be in this order:-

1: C1 fail, C2 kicks in. you still have HUD lights for C2 and handset dispaly and also the VR3.

2: Same scenario for C2 packing in, as above.

3: Loss of handset display, C1 and C2 will still hold SP as preprogramed to do (totaly indpendant of handset display/think PC and monitor)SP will be maintained with the use of internal 3 cells by C1 and C2 it just you cant see the numbers on the handset, you will have HUD lights for C1 and C2 and also the PO2 info on the VR3 to verify that SP maintance is happening by the controlers.

4: Total loss of both C1 and C2, now reliant on just the one cell VR3 for PO2 info to fly the unit manualy.

So IMHO the falut for needing to rely on just the 1 cell is right down at the bottom of the pile, and i know some people say tha they would not trust 1 cell only. I ask why, do you or do you not analise you gas with 1 cell at the surface before you load them into your unit, same goes for people with OC bailout tins.

If the cell is calibrated correctly, and has been verified on the dive to be inline with the other 3 before any elec failure and also reaches above and below SP whats the problem??? Good enough for me to use if needs ever must i can tell you that.

So i cant honestly see what extra you will gain by crimping extra wires into the standard 3 cells, i dont think the extra benefit of seeing 3 cell PO2's will be worth it.





ATB
Gareth

decoweenie

Question...

Answer...

Depth-junkie

Quote:

Quote: (Originally Posted by decoweenie)
a mean to use the unit as mCCR unit if the controller breaks down on long dive trips. On the Meg, I have added the COPIS handset and on the Shearwater-YBOD, I have added the Sartek display. The O2 injection is easily added thru the BMCL.

I have had this discution before with people, if i have a known falut on my unit before a dive i would not dive it.

The use of running a ECCR manulay is a bailout option for inwater problems. Not too botch a dive at the start. As in my mind you are already diving on bailout.

Each to there own though i guess.



ATB
Gareth

decoweenie

We are talking about 2 separate and different things:

1. You are talking about having the controller issue while diving, bailing out and going back with a known malfunction controller with 1 additional cell.
2. I am talking about removing the batteries from the malfunction controller to disable it, then diving the unit for the rest of the trip as mCCR.

Also, your scenario about dealing with the Vision problem doesn't work from personal experience of others who have PM'ed me. Just FYI...