Fitting a VR3 to a PRISM

Chris · 27th July 2005, 23:14

Ok following on from the Meg VR3 Thread

Has anyone out there managed to fit a 4th cell to the PRISM yet?

I figure there are three was to go about this

1: Drill a hole through the head and mount it next to the other three
Not sure if there is enough room for a 4th cell
Might damage the head $$$$
Void warranty

2: Screw on adaptor between the Bulkhead and Inhalation hose
No one I know makes a TPiece (Yet)
Putting on Inhalation hose will keep the sensor nice and dry
No modification to the unit needed

3: Port into the lung
Can't find a good position to mount to P Port
Don't really want any more holes in the lungs

silent running · 7th September 2005, 03:37

Hi Chris, I'm just wondering why exactly you'd want one? I can't see any real advantage which would warrant the extra expense and complexity (another sensor, another set of seals) when the unit maintains it's SP so well. I just toggle back and forth btw the 2 user defined SPs on the VR3. Are you doing a lot of manual dives?-Andy

Chris · 7th September 2005, 03:51

Hi Andy
Couple of reasons, I know the PRISM holds setpoint like a dream, however
I am planning on ditching the Analogue secondary from my unit, after hours of diving the SK and being able to see all three readouts next to each other, I much just prefer it to the brick.
So looking at something like this
http://www.deepdiving.net/misc/sec1.jpg

Having it all digital from the head, it would be nice to have a 4th cell just in case it all goes to the shit.

Real-time Po2 Deco is nice, especially on Deco above 6m when the PRISM wants to sit at .7.

Lastly I just enjoy pulling shit apart.

Cheers
Chris

Underwaterbear · 7th September 2005, 04:06

Hey Chris,

That secondary looks the goods...no delicate jewels there. Have you confirmed it can be wired up to the prism yet?

Also, just looking at the pic...what do you push to cal? The screen?

Finally, how sweet would it be if it were wireless!!? Huh, Jas? Jas?

Cheers
UWB

silent running · 7th September 2005, 04:29

Quote: (Originally Posted by Chris)

Hi Andy
Couple of reasons, I know the PRISM holds setpoint like a dream, however
I am planning on ditching the Analogue secondary from my unit, after hours of diving the SK and being able to see all three readouts next to each other, I much just prefer it to the brick.
So looking at something like this
http://www.deepdiving.net/misc/sec1.jpg

Having it all digital from the head, it would be nice to have a 4th cell just in case it all goes to the shit.

Real-time Po2 Deco is nice, especially on Deco above 6m when the PRISM wants to sit at .7.

Lastly I just enjoy pulling shit apart.

Cheers
Chris

Hi Chris, now I understand. The little digi pod looks very nice. What powers it and how easy are the batteries to change? Are the amps in the housing? As for the above 6m deco, you could turn off the unit and I think there is an option to switch to open circuit bailout O2 on the VR3 to complete the deco, correct? Personally, I wouldn't want another seal/sensor/cable hassel to deal with and would stick with the needle gage secondary. Remember, it still gives you that small additional piece of info that digi meters won't; the speed with which the needle comes up as you switch btw them is an indication of the integrity of the sensor. Does this new little pod give raw m-volt ouputs as well or some other info to compensate for losing the other info? If you get rid of the Prism sec. you'd also be losing the ability to varify the SP and check your battery voltage underwater and on the surface, without opening the head. Are you put off the Prism sec. because it died? Are they sending a new one?-Andy

Chris · 7th September 2005, 04:38

HI Andy
I am sure JasonM will chime in with deatils of the digi secondary, I have not really got alot of info at this stage other that there are plans to get it working on the PRISM's

Yep I do switch the VR3 over to O2 OC when on Deco.

I am bummed with the secondary dying after only 25hours of use, I have not yet heard from SMI, but am sending the secondary back today for them to look at. From reports the digi secondary is not going to be too expensive so if SMI don't come to the party I will definalty be going this way.

Not really stressed about losing the ability to check the battery or SP, I can do these with a mv meter before the dive. However I cant see why we cant look at putting a couple more displays in the case for SP and battery, it is somthing I will be suggesting.

Cheers
Chris

silent running · 7th September 2005, 05:16

Hey Chris, the cable that's attached to the digi pod looks like the same type used for the Prism, Is it? Have any of the other sec. from your OZ batch died?-Andy

Drmike · 7th September 2005, 05:20

Quote: (Originally Posted by Chris)

So looking at something like this
http://www.deepdiving.net/misc/sec1.jpg

Thats a sexy little number

Chris · 7th September 2005, 05:21

Andy
Yes I believe it is the same Lumberg cable used on the PRISM.
Mine is the only secondary to have gone belly-up.

It is odd as it is still working and reads correctly when checking the setpoints, but is out by .1 when off the unit. Anyway we will see what SMI say.

Cheers
Chris

Bazza · 8th September 2005, 03:11

Hi Chris ... don't send the secondary back yet wait until you send your head back with the others units heads, now that SMI have recalled them ... save a few bob!

regards Baz

27th July 2005, 23:14	#1 (permalink)
Chris Go Nude Or Go Home Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Megalodon Prism Topaz Sport Kiss Join Date: Feb 2005 Location: Perth, Western Australia Posts: 607	Fitting a VR3 to a PRISM Ok following on from the Meg VR3 Thread Has anyone out there managed to fit a 4th cell to the PRISM yet? I figure there are three was to go about this 1: Drill a hole through the head and mount it next to the other three Not sure if there is enough room for a 4th cell Might damage the head $$$$ Void warranty 2: Screw on adaptor between the Bulkhead and Inhalation hose No one I know makes a TPiece (Yet) Putting on Inhalation hose will keep the sensor nice and dry No modification to the unit needed 3: Port into the lung Can't find a good position to mount to P Port Don't really want any more holes in the lungs __________________ Megalodon Sorb and Sensors whilst in Australia www.divetub.com.au Diving & Photography @ www.uwphotog.com
(Offline)

7th September 2005, 03:37	#2 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,814	Hi Chris, I'm just wondering why exactly you'd want one? I can't see any real advantage which would warrant the extra expense and complexity (another sensor, another set of seals) when the unit maintains it's SP so well. I just toggle back and forth btw the 2 user defined SPs on the VR3. Are you doing a lot of manual dives?-Andy
(Offline)

7th September 2005, 03:51	#3 (permalink)
Chris Go Nude Or Go Home Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Megalodon Prism Topaz Sport Kiss Join Date: Feb 2005 Location: Perth, Western Australia Posts: 607	Hi Andy Couple of reasons, I know the PRISM holds setpoint like a dream, however I am planning on ditching the Analogue secondary from my unit, after hours of diving the SK and being able to see all three readouts next to each other, I much just prefer it to the brick. So looking at something like this http://www.deepdiving.net/misc/sec1.jpg Having it all digital from the head, it would be nice to have a 4th cell just in case it all goes to the shit. Real-time Po2 Deco is nice, especially on Deco above 6m when the PRISM wants to sit at .7. Lastly I just enjoy pulling shit apart. Cheers Chris __________________ Megalodon Sorb and Sensors whilst in Australia www.divetub.com.au Diving & Photography @ www.uwphotog.com
(Offline)

7th September 2005, 04:06	#4 (permalink)
Underwaterbear A Prismer in Megland Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: May 2005 Location: Seattle, WA Posts: 185	Hey Chris, That secondary looks the goods...no delicate jewels there. Have you confirmed it can be wired up to the prism yet? Also, just looking at the pic...what do you push to cal? The screen? Finally, how sweet would it be if it were wireless!!? Huh, Jas? Jas? Cheers UWB
(Offline)

7th September 2005, 04:29	#5 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,814	Quote: (Originally Posted by Chris) Hi Andy Couple of reasons, I know the PRISM holds setpoint like a dream, however I am planning on ditching the Analogue secondary from my unit, after hours of diving the SK and being able to see all three readouts next to each other, I much just prefer it to the brick. So looking at something like this http://www.deepdiving.net/misc/sec1.jpg Having it all digital from the head, it would be nice to have a 4th cell just in case it all goes to the shit. Real-time Po2 Deco is nice, especially on Deco above 6m when the PRISM wants to sit at .7. Lastly I just enjoy pulling shit apart. Cheers Chris Hi Chris, now I understand. The little digi pod looks very nice. What powers it and how easy are the batteries to change? Are the amps in the housing? As for the above 6m deco, you could turn off the unit and I think there is an option to switch to open circuit bailout O2 on the VR3 to complete the deco, correct? Personally, I wouldn't want another seal/sensor/cable hassel to deal with and would stick with the needle gage secondary. Remember, it still gives you that small additional piece of info that digi meters won't; the speed with which the needle comes up as you switch btw them is an indication of the integrity of the sensor. Does this new little pod give raw m-volt ouputs as well or some other info to compensate for losing the other info? If you get rid of the Prism sec. you'd also be losing the ability to varify the SP and check your battery voltage underwater and on the surface, without opening the head. Are you put off the Prism sec. because it died? Are they sending a new one?-Andy
(Offline)

7th September 2005, 04:38	#6 (permalink)
Chris Go Nude Or Go Home Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Megalodon Prism Topaz Sport Kiss Join Date: Feb 2005 Location: Perth, Western Australia Posts: 607	HI Andy I am sure JasonM will chime in with deatils of the digi secondary, I have not really got alot of info at this stage other that there are plans to get it working on the PRISM's Yep I do switch the VR3 over to O2 OC when on Deco. I am bummed with the secondary dying after only 25hours of use, I have not yet heard from SMI, but am sending the secondary back today for them to look at. From reports the digi secondary is not going to be too expensive so if SMI don't come to the party I will definalty be going this way. Not really stressed about losing the ability to check the battery or SP, I can do these with a mv meter before the dive. However I cant see why we cant look at putting a couple more displays in the case for SP and battery, it is somthing I will be suggesting. Cheers Chris __________________ Megalodon Sorb and Sensors whilst in Australia www.divetub.com.au Diving & Photography @ www.uwphotog.com
(Offline)

7th September 2005, 05:16	#7 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,814	Hey Chris, the cable that's attached to the digi pod looks like the same type used for the Prism, Is it? Have any of the other sec. from your OZ batch died?-Andy
(Offline)

7th September 2005, 05:20	#8 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,157	Quote: (Originally Posted by Chris) So looking at something like this http://www.deepdiving.net/misc/sec1.jpg Thats a sexy little number __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
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7th September 2005, 05:21	#9 (permalink)
Chris Go Nude Or Go Home Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Megalodon Prism Topaz Sport Kiss Join Date: Feb 2005 Location: Perth, Western Australia Posts: 607	Andy Yes I believe it is the same Lumberg cable used on the PRISM. Mine is the only secondary to have gone belly-up. It is odd as it is still working and reads correctly when checking the setpoints, but is out by .1 when off the unit. Anyway we will see what SMI say. Cheers Chris __________________ Megalodon Sorb and Sensors whilst in Australia www.divetub.com.au Diving & Photography @ www.uwphotog.com
(Offline)

8th September 2005, 03:11	#10 (permalink)
Bazza New Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution rEvo Other CCR Dolphin Other Rebreather/s: Prism Topaz Sport Kiss Classic Kiss MK 15.X rEvo Other CCR Dolphin Join Date: Feb 2005 Location: Australia Posts: 161	Hi Chris ... don't send the secondary back yet wait until you send your head back with the others units heads, now that SMI have recalled them ... save a few bob! regards Baz
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