Adjusting Inspiration O2 interstage

James Appel · 14th March 2006, 14:56

I was wondering if someone might be able to ancwer a question I had awhile ago, but never asked, and that is.

Why are you supposed to adjust your oxygen interstage presure on the Inspiration with only 50 bar in the cylinder? This meens I have to bleed off (read waste) my O2 when/if it needs adjusting, which I feel is a waste. It dosnt say in the manuel to only have 50 bar in the diluent cylinder when adjusting it, so why in the Oxy cylinder?

Thank you Je M'Applle "Jim Appel"

J.R.Gauthier · 14th March 2006, 16:19

I've always ajusted my Inspiration and now my Evolutin with the cylinders full and have had no isses. I'll be interested to learn what the others think on this.

Shaunzxr · 14th March 2006, 17:23

The way I've done it in the past is to alter the interstate pressure then connect to the cylinder. If its wrong disconnect, alter, reconnect and test

You can test the interstate pressure with any amount in the cylinder.
You must not adjust with more than 50 bar in the cylinder

**RichClark** · 15th March 2006, 08:13

Quote: (Originally Posted by Shaunzxr)

You must not adjust with more than 50 bar in the cylinder

Why is that? I've never concerned myself with the tank pressure. There's only a fraction of a turn to adjust the IP, and I never wide it all the way up or down.

Cheers

Mark Chase · 15th March 2006, 08:35

Quote: (Originally Posted by RichClark)

Why is that? I've never concerned myself with the tank pressure. There's only a fraction of a turn to adjust the IP, and I never wide it all the way up or down.

Cheers

Above 50bar there is a lot of presure on the seel and your twisting the adjustment??? QED it could go bang

As above i check it disconect adjust it then reconect and check it again.

ATB

Mark Chase

RICHIE W · 15th March 2006, 11:48

have adjusted interstage pressure with full and empty tank pressure ie 200 bar and 50 bar the interstage does not vary at either setting.this equipment is meant to regulate pressure to 7 bar and will continue to do so until the pressure in the tank falls to less than7 bar, the only differences at pressure will be the time or movement of the valve seat opening to maintain pressure back to the set ISP.hope this dispells the myths of ISP setting cheers richie

01RMB · 15th March 2006, 12:34

The big problem you normally get when adjusting the intermediate pressure of a reg when the 1st stage is pressurised is that besides being hard to turn it will score the HP seat and seriously diminish the life of the seat.

One trick you can do is to depressurise the 1st stage by pressing the purge button or manual add whilst adjusting the intermediate pressure. This opens up the HP flow and allows the adjustment to be made without scoring the seat.

J.R.Gauthier · 15th March 2006, 13:02

My instructor taught me to completly vent the gas during ajustment of the first stage, then repressurize to check. If another ajustment is nessasary, then completely vent again.

Heliox · 15th March 2006, 14:15

poseidon 1st stages suggest adjusting i.p. on cylinder with 200 psi.
apparently the i.p varies based on cylinder pressure. i dont know, but perhaps the insp. 1st stages work on the same principle.
-tom

dave t · 16th March 2006, 08:22

Adjusting the IP will not damage the seat the only thing that moves is the tension on the spring in the water chamber. As there may be a small variation in IP depending on cylinder pressure its best to choose a 100bar or so to sort of get a "half way mark"

its important to have the ip set correctly as it will determine whether you see the low batt warning before there is not enough power to open the solenoid

Dave

14th March 2006, 14:56	#1 (permalink)
James Appel New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jan 2006 Location: Springfield, Oregon Posts: 60	Adjusting Inspiration O2 interstage I was wondering if someone might be able to ancwer a question I had awhile ago, but never asked, and that is. Why are you supposed to adjust your oxygen interstage presure on the Inspiration with only 50 bar in the cylinder? This meens I have to bleed off (read waste) my O2 when/if it needs adjusting, which I feel is a waste. It dosnt say in the manuel to only have 50 bar in the diluent cylinder when adjusting it, so why in the Oxy cylinder? Thank you Je M'Applle "Jim Appel"
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14th March 2006, 16:19	#2 (permalink)
J.R.Gauthier New Member Current Rebreather/s: Inspiration Classic Evolution Other Rebreather/s: Join Date: Oct 2005 Location: New Hampshire Posts: 20	Re: Adjusting Inspiration O2 interstage I've always ajusted my Inspiration and now my Evolutin with the cylinders full and have had no isses. I'll be interested to learn what the others think on this.
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14th March 2006, 17:23	#3 (permalink)
Shaunzxr Inspo Luver Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Apr 2005 Location: UK, midlands Posts: 80	Re: Adjusting Inspiration O2 interstage The way I've done it in the past is to alter the interstate pressure then connect to the cylinder. If its wrong disconnect, alter, reconnect and test You can test the interstate pressure with any amount in the cylinder. You must not adjust with more than 50 bar in the cylinder
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15th March 2006, 08:13	#4 (permalink)
RichClark Classic KISS No. 226 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Hove, UK Posts: 759	Re: Adjusting Inspiration O2 interstage Quote: (Originally Posted by Shaunzxr) You must not adjust with more than 50 bar in the cylinder Why is that? I've never concerned myself with the tank pressure. There's only a fraction of a turn to adjust the IP, and I never wide it all the way up or down. Cheers __________________ The more I learn about women, the more I want to go diving... just don't tell my wife I said that To taste something a little different, try http://www.thechillikitchen.co.uk
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15th March 2006, 08:35	#5 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,417	Re: Adjusting Inspiration O2 interstage Quote: (Originally Posted by RichClark) Why is that? I've never concerned myself with the tank pressure. There's only a fraction of a turn to adjust the IP, and I never wide it all the way up or down. Cheers Above 50bar there is a lot of presure on the seel and your twisting the adjustment??? QED it could go bang As above i check it disconect adjust it then reconect and check it again. ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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15th March 2006, 11:48	#6 (permalink)
RICHIE W New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Oct 2005 Location: brotton cleveland uk Posts: 4	Re: Adjusting Inspiration O2 interstage have adjusted interstage pressure with full and empty tank pressure ie 200 bar and 50 bar the interstage does not vary at either setting.this equipment is meant to regulate pressure to 7 bar and will continue to do so until the pressure in the tank falls to less than7 bar, the only differences at pressure will be the time or movement of the valve seat opening to maintain pressure back to the set ISP.hope this dispells the myths of ISP setting cheers richie
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15th March 2006, 12:34	#7 (permalink)
01RMB Evolving Current Rebreather/s: Evolution Other Rebreather/s: Join Date: May 2005 Location: Brisbane, Australia Posts: 188	Re: Adjusting Inspiration O2 interstage The big problem you normally get when adjusting the intermediate pressure of a reg when the 1st stage is pressurised is that besides being hard to turn it will score the HP seat and seriously diminish the life of the seat. One trick you can do is to depressurise the 1st stage by pressing the purge button or manual add whilst adjusting the intermediate pressure. This opens up the HP flow and allows the adjustment to be made without scoring the seat. __________________ Cheers Rod Last edited by 01RMB : 15th March 2006 at 12:39.
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15th March 2006, 13:02	#8 (permalink)
J.R.Gauthier New Member Current Rebreather/s: Inspiration Classic Evolution Other Rebreather/s: Join Date: Oct 2005 Location: New Hampshire Posts: 20	Re: Adjusting Inspiration O2 interstage My instructor taught me to completly vent the gas during ajustment of the first stage, then repressurize to check. If another ajustment is nessasary, then completely vent again.
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15th March 2006, 14:15	#9 (permalink)
Heliox New Member Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: Texas, baby Posts: 28	Re: Adjusting Inspiration O2 interstage poseidon 1st stages suggest adjusting i.p. on cylinder with 200 psi. apparently the i.p varies based on cylinder pressure. i dont know, but perhaps the insp. 1st stages work on the same principle. -tom
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16th March 2006, 08:22	#10 (permalink)
dave t Custom Title Allowed! Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 613	Re: Adjusting Inspiration O2 interstage Adjusting the IP will not damage the seat the only thing that moves is the tension on the spring in the water chamber. As there may be a small variation in IP depending on cylinder pressure its best to choose a 100bar or so to sort of get a "half way mark" its important to have the ip set correctly as it will determine whether you see the low batt warning before there is not enough power to open the solenoid Dave
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