IDA-72 modification ideas

divingtoors · 9th June 2008, 11:50

HI There

My IDA-72 has finally arrived !!
It is a machine of beauty...
This is the most incredible rebreather I have ever seen...
It is truley awesome.!!

My idea is to convert the IDA-72 to a CCR, but I want to do a lot of research and looking at different possibilities before I commit to a course of action.

I picked up a little bit of experience with the modification of my IDA-71, and I will probably go down much a similar route.

Dave Sutton has really given me a lot of insight into the IDA-72 with his excellent website, so has Bob Bollard's site.

A few questions for the much more experienced folk here on Rebreather World:

Any ideas on the placing of the Oxygen Sensors. I have done the P-Port method on my IDA-71 and was not entirely happy with the result, as my sensors seemed to pick up some moisture every now and then, giving me false readings on my PPO2 displays, and washing the unit is a PITA, always trying to keepo the sensors dry and out of harms way. I have looked at some of the very unique and clever designs that Martin @ Tecme has come up with. Any ideas from the builders out there?
I seem to understand that the IDA-72 is a SCR, with gas supply being fed from an Diving bell through an umbulical. Would there be a practical route of actually keeping the SCR functionality of the IDA-72. Does anybody know what gasses they used for the supply ?
Any other ideas that might be handy?

Best Regards

johan

Corallaro · 9th June 2008, 14:53

in my 71 i use three k1d sensors with a p-port in couterlung but i make a cover over them and the "manual diluent in" is (as Dave made) directly into the sensor holder so when i flush diluent it dry sensors and i can test it whit a known mix....

at this moment the reading was OK

Giovanni

osiris · 9th June 2008, 14:58

Quote: (Originally Posted by divingtoors)

HI There

My IDA-72 has finally arrived !!
It is a machine of beauty...
This is the most incredible rebreather I have ever seen...
It is truley awesome.!!

My idea is to convert the IDA-72 to a CCR, but I want to do a lot of research and looking at different possibilities before I commit to a course of action.

I picked up a little bit of experience with the modification of my IDA-71, and I will probably go down much a similar route.

Dave Sutton has really given me a lot of insight into the IDA-72 with his excellent website, so has Bob Bollard's site.

A few questions for the much more experienced folk here on Rebreather World:

Any ideas on the placing of the Oxygen Sensors. I have done the P-Port method on my IDA-71 and was not entirely happy with the result, as my sensors seemed to pick up some moisture every now and then, giving me false readings on my PPO2 displays, and washing the unit is a PITA, always trying to keepo the sensors dry and out of harms way. I have looked at some of the very unique and clever designs that Martin @ Tecme has come up with. Any ideas from the builders out there?
I seem to understand that the IDA-72 is a SCR, with gas supply being fed from an Diving bell through an umbulical. Would there be a practical route of actually keeping the SCR functionality of the IDA-72. Does anybody know what gasses they used for the supply ?
Any other ideas that might be handy?

Best Regards

johan

Welcome to the IDA-72 club. A lot of the piping you can keep - you can modify it.; in my view, you don't need the fancy fang dangle hand set; the IDA 72 is a ideal vehicle for eCCR - look at Laguna research. I am plugging 2 X Apeks DS-4 into the unit - I'll use the 2 2 ltr tanks for O2 and use off board dil; I've pulled the valves out of the cylinders and will order Kleinkonisch valves from tecme; I'll plug in a 2nd P-Port to the C/L and stick a Co2 sensor in there as well. Most of the plumbing got binned unfortunately.

The unit was SCR full stop; if the surface supply stopped, then you had gas sufficient to get back to the bell, maybe.

LagunaResearch · 16th June 2008, 05:23

Congrats on the IDA-72! Sounds like you have a fun project in front of you. In regards to conversion to ECCR, one possibility is definitely the Laguna Research Controller system- It is designed to plug in to a wide range of systems and accomodate the differences found between different placements of sensors, gas addition, loop size, dwell time, etc... The easiest means of connection for your system is with the P-Port sensor array but as you noted, depending on placement, you may have issues with moisture. I don't know if you have any dryer places to put sensors on that rig. One of the challenges in doing a conversion is figuring out a practical means of connecting to a controller and secondary display. The advantage with the P-Port is that all the connections are pre-existing on the plug itself- it even as a port for adding gas if you don't have any place else to plug in to.

One thing to take care about regardless of which system you set yourself up with is to make sure you get a true isolation between the primary (with the gas solenoid) and the secondary (backup) sides of the system- the sensors need to be isolated so that a failure on one side (like a leaking case) doesn't short out the alternative side....

The Laguna Research control system itself is self-contained with solenoid, batteries, HUD, etc..- all you do is bolt it on, connect the gas, and plug in the sensors! (add water?).
Laguna Research - Electronic Design & Manufacture

9th June 2008, 11:50	#1 (permalink)
divingtoors RBW Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Mar 2006 Location: Cape Town Posts: 103	IDA-72 modification ideas HI There My IDA-72 has finally arrived !! It is a machine of beauty... This is the most incredible rebreather I have ever seen... It is truley awesome.!! My idea is to convert the IDA-72 to a CCR, but I want to do a lot of research and looking at different possibilities before I commit to a course of action. I picked up a little bit of experience with the modification of my IDA-71, and I will probably go down much a similar route. Dave Sutton has really given me a lot of insight into the IDA-72 with his excellent website, so has Bob Bollard's site. A few questions for the much more experienced folk here on Rebreather World: Any ideas on the placing of the Oxygen Sensors. I have done the P-Port method on my IDA-71 and was not entirely happy with the result, as my sensors seemed to pick up some moisture every now and then, giving me false readings on my PPO2 displays, and washing the unit is a PITA, always trying to keepo the sensors dry and out of harms way. I have looked at some of the very unique and clever designs that Martin @ Tecme has come up with. Any ideas from the builders out there? I seem to understand that the IDA-72 is a SCR, with gas supply being fed from an Diving bell through an umbulical. Would there be a practical route of actually keeping the SCR functionality of the IDA-72. Does anybody know what gasses they used for the supply ? Any other ideas that might be handy? Best Regards johan __________________ "..Recreational scuba training has developed the denial of risk into an art form...." ( Larry "Harris" Taylor, Ph.D.) "The closer you are to danger, the further you are from harm" - Pippin Took (Hobbit)
(Online)

9th June 2008, 14:58	#3 (permalink)
osiris RBW Member Current Rebreather/s: Inspiration Classic MK 15.X Other Rebreather/s: Sport Kiss Join Date: Feb 2006 Location: Auckland Posts: 346	Re: IDA-72 modification ideas Quote: (Originally Posted by divingtoors) HI There My IDA-72 has finally arrived !! It is a machine of beauty... This is the most incredible rebreather I have ever seen... It is truley awesome.!! My idea is to convert the IDA-72 to a CCR, but I want to do a lot of research and looking at different possibilities before I commit to a course of action. I picked up a little bit of experience with the modification of my IDA-71, and I will probably go down much a similar route. Dave Sutton has really given me a lot of insight into the IDA-72 with his excellent website, so has Bob Bollard's site. A few questions for the much more experienced folk here on Rebreather World: Any ideas on the placing of the Oxygen Sensors. I have done the P-Port method on my IDA-71 and was not entirely happy with the result, as my sensors seemed to pick up some moisture every now and then, giving me false readings on my PPO2 displays, and washing the unit is a PITA, always trying to keepo the sensors dry and out of harms way. I have looked at some of the very unique and clever designs that Martin @ Tecme has come up with. Any ideas from the builders out there? I seem to understand that the IDA-72 is a SCR, with gas supply being fed from an Diving bell through an umbulical. Would there be a practical route of actually keeping the SCR functionality of the IDA-72. Does anybody know what gasses they used for the supply ? Any other ideas that might be handy? Best Regards johan Welcome to the IDA-72 club. A lot of the piping you can keep - you can modify it.; in my view, you don't need the fancy fang dangle hand set; the IDA 72 is a ideal vehicle for eCCR - look at Laguna research. I am plugging 2 X Apeks DS-4 into the unit - I'll use the 2 2 ltr tanks for O2 and use off board dil; I've pulled the valves out of the cylinders and will order Kleinkonisch valves from tecme; I'll plug in a 2nd P-Port to the C/L and stick a Co2 sensor in there as well. Most of the plumbing got binned unfortunately. The unit was SCR full stop; if the surface supply stopped, then you had gas sufficient to get back to the bell, maybe.
(Online)

16th June 2008, 05:23	#4 (permalink)
LagunaResearch New Member Current Rebreather/s: Inspiration Classic Sport Kiss MK 15.X Other CCR Dolphin Ray Azimuth Other SCR Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss MK 15.X Other CCR Dolphin Ray Azimuth Other SCR Home Build Join Date: Nov 2006 Location: California Posts: 7	Re: IDA-72 modification ideas Congrats on the IDA-72! Sounds like you have a fun project in front of you. In regards to conversion to ECCR, one possibility is definitely the Laguna Research Controller system- It is designed to plug in to a wide range of systems and accomodate the differences found between different placements of sensors, gas addition, loop size, dwell time, etc... The easiest means of connection for your system is with the P-Port sensor array but as you noted, depending on placement, you may have issues with moisture. I don't know if you have any dryer places to put sensors on that rig. One of the challenges in doing a conversion is figuring out a practical means of connecting to a controller and secondary display. The advantage with the P-Port is that all the connections are pre-existing on the plug itself- it even as a port for adding gas if you don't have any place else to plug in to. One thing to take care about regardless of which system you set yourself up with is to make sure you get a true isolation between the primary (with the gas solenoid) and the secondary (backup) sides of the system- the sensors need to be isolated so that a failure on one side (like a leaking case) doesn't short out the alternative side.... The Laguna Research control system itself is self-contained with solenoid, batteries, HUD, etc..- all you do is bolt it on, connect the gas, and plug in the sensors! (add water?). Laguna Research - Electronic Design & Manufacture __________________ Wayne Miller Laguna Research, Inc www.lagunaresearch.com 949-484-4515v 530-468-2257f
(Offline)

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