Drager Ray Overview

**Dave1w** · 3rd February 2008, 23:38

I have been thinking cheaper than that. a Mcmaster carr orifice to the bottom of the scrubber, suit inflator in place of the front OPV, Bypass modified to just an ADV, then either a couple of cells in the head of the scrubber, or one of Martins sensor housing / elbows for the hose.

You could maybe have a dil manual add going into the bottom of the scrubber too, then you could put you sensors where the bypass goes in, but I am not sure if that is really in the gas flow round the loop

Just thinking...

Added - Just seen something new from Martin
Very Special Parts for Rebreathers

Now, an extension on the other port, and mount the cylinders down the side of the scrubber using a 160 mm pvc tube ......

**SeaBass** · 4th February 2008, 04:06

Quote: (Originally Posted by teomannaskali)

I am wondering about the wob limitations of the unit.

WOB is just fine. One common problem with some OTSCL units is having them too tight. That affects WOB if you are not careful.

Thom

.

**Freef** · 4th February 2008, 15:59

Quote: (Originally Posted by SeaBass)

I attached a portion of the Drager Ray manual where it refers to post dive maintenance (see below). Evidently all that is required is disconnecting p-ports, rinsing with hot water and hanging it up to dry.

It's not just the cleaning, but keeping an eye on the lungs for signs of damage as well.

The Ray as standard is less flexible than the Dolphin, which is less flexible than most of the later SCR units. I've dived my Dolph with a buddy on a Ray to 36m, his pO2 was a little high until we got back to 25m.

David Parker · 4th February 2008, 22:22

Well interested in converting one, has anyone got any pics?

Cheers
Dave

ps. top thread freef......

TigerCD · 8th February 2008, 09:21

1. replace the front opv with an drysuit Valve for manual diluent add (~40 Euro)
2. replace the Ray Bypass valve with the Dolphin Bypass sealing insert (~ 35 Euro)
3. o2 inlet in the Bottom of the Scrubber (p-port holder with inflator connection Tecme ~ 40 Euro)
4. CMF Valve ?RG/UF-M? (~70 Euro)
5. 2l O2 Tank (~120 Euro)
6. Inflator Hose (~20 Euro)
So you pay for the complete conversion without O2 monitoring !!! only ~ 350 Euro
Cheers
Carsten

**Dave1w** · 8th February 2008, 11:25

Quote: (Originally Posted by TigerCD)

1. replace the front opv with an drysuit Valve for manual diluent add (~40 Euro)
2. replace the Ray Bypass valve with the Dolphin Bypass sealing insert (~ 35 Euro)
3. o2 inlet in the Bottom of the Scrubber (p-port holder with inflator connection Tecme ~ 40 Euro)
4. CMF Valve ?RG/UF-M? (~70 Euro)
5. 2l O2 Tank (~120 Euro)
6. Inflator Hose (~20 Euro)
So you pay for the complete conversion without O2 monitoring !!! only ~ 350 Euro
Cheers
Carsten

Plus rEvodream - 400 euro

30 meter 1 1/2 hr CCR for - hmmm 1200 euro (if you can pick up a cheap unit)

Dave

David Parker · 8th February 2008, 13:00

Quote: (Originally Posted by Dave1w)

Plus rEvodream - 400 euro

30 meter 1 1/2 hr CCR for - hmmm 1200 euro (if you can pick up a cheap unit)

Dave

Why rate it to 30M max ?????

**Dave1w** · 8th February 2008, 13:09

I said 30m just so no one gets upset. Drager has rated it to 40m by putting making the 32% bypass available. Lets just remember its still a little Ray!

So if being conservative, I am sure 30m, 90 mins should be Ok.

Dave

TigerCD · 8th February 2008, 13:29

Quote:

Lets just remember its still a little Ray!

So what? This is a mccr with 5l diluent/Bail out !!! How much Bail out has a Dolfin?p>The limit of the Ray is the Scrubber with just 110 minutes...
If you will use the CMF of the RG/UF-M the deep limit is 40 meters.
Carsten

**SeaBass** · 8th February 2008, 15:27

Carsten,

Thanks for the list... however it can be done cheaper.

1. Drill a hole in the cap of Ray Dosage unit so you can manual add by pushing through the hole in the cap and against the diaphram.
2. Keep the Ray Dosage unit and solder or weld the hole shut on any of the constant flow orifices. (it's under the o-ring see picture) The demand will continue to work by allowing flow through the end. Additional gas can be plumbed directly into the demand valve body similar to the Dolphin.
4. Constant mass flow valve: McMaster.com - 3820K41 < $15.00 Each

Regarding depth limits: Dave Sutton was kind enough to send me this PM:

"Hey Thom, I actually really like the Ray, and ought to grab another one. I had one for years that I ran as a CCR using (2) 13's mounted vertically alongside of the scrubber. It was a nice little rig. The scrubber is WAY too small for deep work though... I'd limit it to about 130 feet for that reason alone. I'm sorry I sold mine, it was cool. For travel and recreational play? Just a nice little rig.

Dave

."

Thom

Quote: (Originally Posted by TigerCD)

1. replace the front opv with an drysuit Valve for manual diluent add (~40 Euro)
2. replace the Ray Bypass valve with the Dolphin Bypass sealing insert (~ 35 Euro)
3. o2 inlet in the Bottom of the Scrubber (p-port holder with inflator connection Tecme ~ 40 Euro)
4. CMF Valve ?RG/UF-M? (~70 Euro)
5. 2l O2 Tank (~120 Euro)
6. Inflator Hose (~20 Euro)
So you pay for the complete conversion without O2 monitoring !!! only ~ 350 Euro

Cheers, Carsten

3rd February 2008, 23:38	#11 (permalink)
Dave1w Born Again Diver! Current Rebreather/s: Sport Kiss Dolphin Ray Home Build Other Rebreather/s: Classic Kiss Dolphin Ray Home Build Join Date: Jan 2005 Location: Singapore / UK Posts: 347	Re: Drager Ray Overview I have been thinking cheaper than that. a Mcmaster carr orifice to the bottom of the scrubber, suit inflator in place of the front OPV, Bypass modified to just an ADV, then either a couple of cells in the head of the scrubber, or one of Martins sensor housing / elbows for the hose. You could maybe have a dil manual add going into the bottom of the scrubber too, then you could put you sensors where the bypass goes in, but I am not sure if that is really in the gas flow round the loop Just thinking... Added - Just seen something new from Martin Very Special Parts for Rebreathers Now, an extension on the other port, and mount the cylinders down the side of the scrubber using a 160 mm pvc tube ...... __________________ This message may contain spelling mistakes as it was generated by an idiot. Last edited by Dave1w : 3rd February 2008 at 23:55. Reason: Added a couple of lines
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4th February 2008, 04:06	#12 (permalink)
SeaBass Thom Susko Current Rebreather/s: Megalodon Ray Home Build Other Rebreather/s: Not Bought Yet Ray Home Build Join Date: Jul 2006 Location: San Clemente, CA Posts: 232	Re: Drager Ray Overview Quote: (Originally Posted by teomannaskali) I am wondering about the wob limitations of the unit. WOB is just fine. One common problem with some OTSCL units is having them too tight. That affects WOB if you are not careful. Thom .
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4th February 2008, 15:59	#13 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: Drager Ray Overview Quote: (Originally Posted by SeaBass) I attached a portion of the Drager Ray manual where it refers to post dive maintenance (see below). Evidently all that is required is disconnecting p-ports, rinsing with hot water and hanging it up to dry. It's not just the cleaning, but keeping an eye on the lungs for signs of damage as well. The Ray as standard is less flexible than the Dolphin, which is less flexible than most of the later SCR units. I've dived my Dolph with a buddy on a Ray to 36m, his pO2 was a little high until we got back to 25m. __________________ David. Currently owner of two differently sized ankles.
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4th February 2008, 22:22	#14 (permalink)
David Parker New Member Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Not Bought Yet Dolphin Home Build Join Date: Jan 2006 Location: Essex Posts: 61	Re: Drager Ray Overview Well interested in converting one, has anyone got any pics? Cheers Dave ps. top thread freef...... __________________ Fuzzy & Fat
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8th February 2008, 09:21	#15 (permalink)
TigerCD New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2007 Location: Germany / Bayern Posts: 5	Re: Drager Ray Overview 1. replace the front opv with an drysuit Valve for manual diluent add (~40 Euro) 2. replace the Ray Bypass valve with the Dolphin Bypass sealing insert (~ 35 Euro) 3. o2 inlet in the Bottom of the Scrubber (p-port holder with inflator connection Tecme ~ 40 Euro) 4. CMF Valve ?RG/UF-M? (~70 Euro) 5. 2l O2 Tank (~120 Euro) 6. Inflator Hose (~20 Euro) So you pay for the complete conversion without O2 monitoring !!! only ~ 350 Euro Cheers Carsten Last edited by TigerCD : 8th February 2008 at 09:24.
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8th February 2008, 11:25	#16 (permalink)
Dave1w Born Again Diver! Current Rebreather/s: Sport Kiss Dolphin Ray Home Build Other Rebreather/s: Classic Kiss Dolphin Ray Home Build Join Date: Jan 2005 Location: Singapore / UK Posts: 347	Re: Drager Ray Overview Quote: (Originally Posted by TigerCD) 1. replace the front opv with an drysuit Valve for manual diluent add (~40 Euro) 2. replace the Ray Bypass valve with the Dolphin Bypass sealing insert (~ 35 Euro) 3. o2 inlet in the Bottom of the Scrubber (p-port holder with inflator connection Tecme ~ 40 Euro) 4. CMF Valve ?RG/UF-M? (~70 Euro) 5. 2l O2 Tank (~120 Euro) 6. Inflator Hose (~20 Euro) So you pay for the complete conversion without O2 monitoring !!! only ~ 350 Euro Cheers Carsten Plus rEvodream - 400 euro 30 meter 1 1/2 hr CCR for - hmmm 1200 euro (if you can pick up a cheap unit) Dave __________________ This message may contain spelling mistakes as it was generated by an idiot.
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8th February 2008, 13:00	#17 (permalink)
David Parker New Member Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Not Bought Yet Dolphin Home Build Join Date: Jan 2006 Location: Essex Posts: 61	Re: Drager Ray Overview Quote: (Originally Posted by Dave1w) Plus rEvodream - 400 euro 30 meter 1 1/2 hr CCR for - hmmm 1200 euro (if you can pick up a cheap unit) Dave Why rate it to 30M max ????? __________________ Fuzzy & Fat
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8th February 2008, 13:09	#18 (permalink)
Dave1w Born Again Diver! Current Rebreather/s: Sport Kiss Dolphin Ray Home Build Other Rebreather/s: Classic Kiss Dolphin Ray Home Build Join Date: Jan 2005 Location: Singapore / UK Posts: 347	Re: Drager Ray Overview I said 30m just so no one gets upset. Drager has rated it to 40m by putting making the 32% bypass available. Lets just remember its still a little Ray! So if being conservative, I am sure 30m, 90 mins should be Ok. Dave __________________ This message may contain spelling mistakes as it was generated by an idiot.
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8th February 2008, 13:29	#19 (permalink)
TigerCD New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2007 Location: Germany / Bayern Posts: 5	Re: Drager Ray Overview Quote: Lets just remember its still a little Ray! So what? This is a mccr with 5l diluent/Bail out !!! How much Bail out has a Dolfin?p>The limit of the Ray is the Scrubber with just 110 minutes... If you will use the CMF of the RG/UF-M the deep limit is 40 meters. Carsten Last edited by TigerCD : 8th February 2008 at 13:43.
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