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USER MANUAL :: 

ENGLISH

:: 23

XSTREAM

BREATHING PERFORMANCE

Full  regulator  capacity  is  obtained  as  long  as  the  cylinder 

pressure  is  twice  the  absolute  interstage  pressure,  given 

the  cylinder  valve  pressure  drop  is  within  EN  250  limits. 

Taking  into  account  the  normal  variations  in  interstage 

pressure and adding a safety margin, the required minimum 

cylinder pressure during diving is:

50 bar cylinder pressure from 0 msw to 100 msw

70 bar cylinder pressure from 101 msw to 200 msw

It is a good practise to always plan your dive according to 

the  “1/3-rule”,  planning  to  use  2/3  of  the  cylinder  capa-

city.

The  diagram  above  show  a  calculated  graph  for  Work  of 

Breathing in Joules/litre at Q

average

=62.5 litres/min. 

The equation behind it, is extracted from hundreds of tests, 

from  which  coefficients  for  gas  dependency,  average  flow 

dependency, and depth dependency is calculated.

Its maximum inaccuracy is /- 10%

The equation assumes the most dense gas possible to safely 

breath  is  used,  i.e.  a  maximum  tolerable  pO

2

,  pN

2

  at  any 

depth. Adding more Helium will lower the figures.

It  is  important  to  understand  that  this  equation  does  not 

apply to any other regulator, since the coefficients and cha-

racteristics  are  strongly  dependent  on  the  regulator  cons-

truction.

Recommended limit

Min cylinder pressure

Absolute interstage pressure

EN 250 stops here

Summary of Contents for XSTREAM

Page 1: ...USER MANUAL ENGLISH XSTREAM...

Page 2: ...0 s The same ideas motivate us now The name Poseidon represents constant development and improvement of diving equipment where everything is positioned correctly and everything functions even in the m...

Page 3: ...Type approvement certificate no 020341 020342 and 020343 is issued by SGS United Kingdom Ltd Unit 202b Worle Parkway Weston super mare BS22 6WA United Kingdom Notified body number 0120 Production qua...

Page 4: ...ng greater than 21 oxy gen up to 50 Enriched Air Nitrox IP Interstage pressure the pressure existing between the 1st stage and the 2nd stage valve HP High pressure the pressure inside the SCUBA cylind...

Page 5: ...oxy gen content than 99 95 by volume Xstream Deep models only for use with air or Trimix with a maximum oxygen content of 21 and a maximum Helium content of 77 Xstream Dive and octopus only for use wi...

Page 6: ...r than 18 m 59 ft or in overhead environment requires special train ing regarding practices equipment physical and medical understanding This manual assumes the reader has some basic knowledge in thos...

Page 7: ...must be used exclusively with Nitrox or Oxygen and should be kept O2 clean at all times If a Oxygen Deco or Duration regulator is contaminated or used with a contaminated fill then the regulator must...

Page 8: ...medical effects or even death if used incorrectly Use recognised tables for oxygen exposure Xstream Oxygen EN 144 3 Deco Deco EN 144 3 is approved for oxygen service directly from the box i e it is cl...

Page 9: ...if it gets lost during the operation the regulator will continue to function but must only be used for immediate ascent In case of a malfunction in the 1st stage causing excessive intermediate pressur...

Page 10: ...extreme leaktightness Conventional designs are sensitive to wear misalignment and manufacturing precision A ball always finds its correct place Combined with the 2nd stage the enormous capacity of the...

Page 11: ...r of 0 C 32 F for at least 10 minutes and after wards still be completely unaffected DEEP DEEP90 1 ST STAGE TRIMIX AIR All materials in Xstream Deep are chosen and tested to be optimised for Helium an...

Page 12: ...d NVR levels less than ASTM G63 Level C 50 mg m2 hydrocarbons The Xstream Oxy90 1st stage is only used on the Mk VI Discovery Rebreather The Xstream Deco was discontinued in 2005 DURATION DURATION EN...

Page 13: ...e gas by as much as 12 C 22 F under certain conditions Using a long hose requires some basic knowledge in its use and routing to take the full advantages Poseidon does not recommend the use of hose pr...

Page 14: ...nnection areas with your fingers since fingerprints are a combustible con tamination OXYGEN ALERT PRE DIVE The procedure described below only describes the manner in which the regulator is assembled a...

Page 15: ...n the knob back half turn When the 2nd stage is pressurised and the servo mechanism engages a maximum of 3 litres of gas vents from the 2nd stage Slow opening of the cylinder valve is the best way to...

Page 16: ...ck for the regulator being used The mouth region can become numb from cold and you risk loosing the regulator DIVING What is most distinctive about the Xstream is that it is easy to use there aren t a...

Page 17: ...that the pro tective cap is free from water and debris then mount the protective cap onto the connection The regulator should not be stored in direct sunlight and or at high temperatures Make sure it...

Page 18: ...stream neck strap surgical cord Poseidon Jetstream 2nd stage and hose EN 250 Poseidon Jetstream 1st stage EN 250 All CE marked or EN 250 designated cylinder valves Yoke clamp All CE marked approved pr...

Page 19: ...t gas mix Always follow established calculation methods and mixing procedures for mixing a breathable gas These are not des cribed herein WARNING WARNING Approved gas mixes for Xstream Deep If air is...

Page 20: ...4351 psi Cold water perfor mance Exceeding EN 250 requirements for cold water use Approvals Type Approved acc to EU Direc tive Personal Protective Equipment 89 686 EEC Applicable Performan ce Standard...

Page 21: ...gical cord Silicone Dismountable w o tools Yes Anatomic Mouthpiece Poseidon AIR 1st stage Flowrate l min 4000 l min 141 scfm Nominal inter stage pres 8 5 bar 123 psi Anti Freeze protec tion Built in T...

Page 22: ...22 XSTREAM USER MANUAL ENGLISH M I S C E L L A N E O U S EXPLODED VIEWS With over pressure valve built in to the 1st stage No over pressure valve built in to the 1st stage...

Page 23: ...of the cylinder capa city The diagram above show a calculated graph for Work of Breathing in Joules litre at Qaverage 62 5 litres min The equation behind it is extracted from hundreds of tests from wh...

Page 24: ...regula tor free flows breaking the surface Check the cracking pressure see sec tion 6 2 If the crack ing pressure is too low it i n c r e a s e s the risk for free flow Have the re gulator cor rectly...

Page 25: ...room environment made up by materials chosen to expose lowest possible risk x failure effect product and are tested and approved for oxygen use It is strictly prohibited to use the Poseidon Xstream O...

Page 26: ...ised service loca tions Look for the POSEIDON Authorised Service Center sign SERVICE CENTER AUTHORIZED Because of the robustness and simplicity of the Xstream construction the amount of servicing is k...

Page 27: ...uct are prohibited Modifications can impair the function of the regulator and transfers the responsibility to the person who does the mo dification Adding decals and other outer means for oxygen Nitro...

Page 28: ......

Page 29: ...421 08 V stra Fr lunda SWEDEN t 46 0 31 7342900 f 46 0 31 7342901 www poseidon se Art no 4695 ISSUE 040924 3 WE INTEND TO CONTINUE TO PRODUCE DIVING EQUIPMENT AS LONG AS A SINGLE DROPOFWATERREMAINSINT...

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