KISS cell monitoring - passive 2/3-cell & computer

[weazelz]

I have been looking around at second-hand KISSes lately & one of the mod's that seems to have been done to some is adding a computer to monitor a/the cell/cells. this sometimes (always?) seems to have been done in conjunction with reducing the passive 3-cell monitoring to 2-cell

can someone explain how this is done on the KISS? is it possible to add a 4th cell? if I add a basic computer - eg vr3 - will it monitor one cell & the other two/three will be passive backup? if I add a more sophisticated computer - eg shearwater - does it monitor one/three cells & is there a backup, passive display?

finally, if I get something that is cabled up for a Shearwater & two passive backups, is it a big deal to re-cable for three passive / some passive & vr3 / etc. ?

[deepestandy]

Originally Posted by weazelz

I have been looking around at second-hand KISSes lately & one of the mod's that seems to have been done to some is adding a computer to monitor a/the cell/cells. this sometimes (always?) seems to have been done in conjunction with reducing the passive 3-cell monitoring to 2-cell

can someone explain how this is done on the KISS? is it possible to add a 4th cell? if I add a basic computer - eg vr3 - will it monitor one cell & the other two/three will be passive backup? if I add a more sophisticated computer - eg shearwater - does it monitor one/three cells & is there a backup, passive display?

finally, if I get something that is cabled up for a Shearwater & two passive backups, is it a big deal to re-cable for three passive / some passive & vr3 / etc. ?

There wouldn't have been anything on ebay that too your eye recently would there?

I'm fairly sure that with the passive backup on the KISS (or any other RB with Passive displays or otherwise) the only definite way to be sure which cells are working is to do a dill flush and see which cell has the error. So by this thinking. Why have three? you would need three for the voting logic to work on the primary though (sherewater/VRX...Whatever).

The VR3 will only look at one cell so to have thee cell monitoring for decompression you would need a Sherewater, VRX, X1 etc. (I think).

[SoggyFox]

Originally Posted by weazelz

can someone explain how this is done on the KISS? is it possible to add a 4th cell? if I add a basic computer - eg vr3 - will it monitor one cell & the other two/three will be passive backup? if I add a more sophisticated computer - eg shearwater - does it monitor one/three cells & is there a backup, passive display?

the shearwater monitors all 3 and works on voting logic for the deco, have a google for the manual or PM me your email and i think have a copy somewhere, i've had a cell drop out and its worked fine and the HUD still showing all 3 cells (wiring problem). The HUD on the shearwater is the passive monitoring and runs independant of the handset. You'd obviously need the shearwater and HUD combo.

[weazelz]

Originally Posted by deepestandy

I'm fairly sure that with the passive backup on the KISS (or any other RB with Passive displays or otherwise) the only definite way to be sure which cells are working is to do a dill flush and see which cell has the error. So by this thinking. Why have three? you would need three for the voting logic to work on the primary though (sherewater/VRX...Whatever)

I suppose my thinking was that on other CCR's - eCCR's probably - that the vr3 (or other single-cell-monitoring computer) would run off a 4th cell, because the electronics still need 3 cells for the voting logic to run the solenoid/etc. by that logic, 3 passive & a 4th for single-cell deco is probably not required on an mCCR - 2 passive would be sufficient

can someone confirm yes/no whether the KISS supports a 4th cell?

[weazelz]

Originally Posted by SoggyFox

the shearwater monitors all 3 and works on voting logic for the deco, have a google for the manual or PM me your email and i think have a copy somewhere, i've had a cell drop out and its worked fine and the HUD still showing all 3 cells (wiring problem). The HUD on the shearwater is the passive monitoring and runs independant of the handset. You'd obviously need the shearwater and HUD combo.

does the HUD monitor all three cells too? with voting logic, or passively?

I'm not quite clear what the bold bit means. three cells working & a wiring problems between a cell & the computer, but the HUD kept working?

[SoggyFox]

Originally Posted by weazelz

does the HUD monitor all three cells too? with voting logic, or passively?

I'm not quite clear what the bold bit means. three cells working & a wiring problems between a cell & the computer, but the HUD kept working?

the HUD and Handset are connected to the 3 cells but with seperate wiring, one of the wires from cell to handset came loose, so the handset read 2 cells but the HUD still read all 3. effectively the HUD and handset are independant of each other, only reading from same 3 cells.

HUD is passive.

[turbanator]

Originally Posted by weazelz

does the HUD monitor all three cells too? with voting logic, or passively?

I'm not quite clear what the bold bit means. three cells working & a wiring problems between a cell & the computer, but the HUD kept working?

The shearwater and it's hud each have their own battery and o/p device. So each device (as long as it has infinate(ish) input impedance) is indpendent.

Re: your 4th cell q., I'm not sure that you could get a 4th cell into the head, however there are ways of putting them in the c/l's on Dragers that could be adapted.

Originally Posted by Soggyfox

HUD is passive.

Depends on your definition. 'Passive' could mean a meter that is sensistive enough to be driven from the current generated by the cell alone, therefore needing no batteries.
r
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[deepestandy]

Originally Posted by weazelz

I suppose my thinking was that on other CCR's - eCCR's probably - that the vr3 (or other single-cell-monitoring computer) would run off a 4th cell, because the electronics still need 3 cells for the voting logic to run the solenoid/etc. by that logic, 3 passive & a 4th for single-cell deco is probably not required on an mCCR - 2 passive would be sufficient

can someone confirm yes/no whether the KISS supports a 4th cell?

There is bags of stuff on RBW but I can't find anything about 4th cell, To be honest I am not sure why you would need one. If you had a Sherewater for example with three cell monitoring for your deco and a two/three cell passive backup then why have a fourth cell with separate decompression obligation?

I can see the validity of something like this on a vision where you only have one display (not counting the HUD), but surely when the shit hits the fan the best thing to do is to know for certain which cells are telling the truth and get the fcuk out of there!

[turbanator]

Originally Posted by deepestandy

the best thing to do is to know for certain which cells are telling the truth and get the fcuk out of there!

'Dilflush' is your friend.

[SoggyFox]

Originally Posted by weazelz

does the HUD monitor all three cells too? with voting logic, or passively?

Originally Posted by turbanator

Depends on your definition. 'Passive' could mean a meter that is sensistive enough to be driven from the current generated by the cell alone, therefore needing no batteries.

i assumed he was asking after whether there was any voting logic in the HUD rather than simply displaying the cell info (same as old handsets did)