Main IndexPhotos Draeger SMS 1 B

 

DATASHEET SEMI CLOSED REBREATHER

SMS I/B

Date: 09 November 2005

Schlauchabhängiges-Mischgas-Schwimmtauchgerat mit Bypass
(Hose dependant – Mixgas – Swim diveunit with Bypass)

Database semi closed rebreathers by: J.W. Bech

Manufacturer

Dräger

(name or company)

Designer

 

(name)

Model

SMS1/B

(number type)

Land of origin

Germany

(country)

Design year

1969-1970

(actual project start)

Special Note: 

Variant See SMS 1

(additional space for info)

User group

Military

 (sport/mil/civil/fire)

Magnetic characteristics

 

(if known)

Part no:

T12 170

(part #)

Working principle

Constant Mass Flow

(CMF/Metering,Passive)

Gas type

Heliox 17,5/82,5

(Heliox/Nitrox)

Gas mix type

% Oxygen

% Helium

Flow

Worktime

Depth

(backup) Heliox

17,5

82,5

 

8 min

200m

 

 

 

 

 

 

1 liter backup cylinder filled with 200 bar.o The CMF will work to max 40 bar, therefore 160 liter gas is available. Since 8 min dive time is referred to the flow will be 20 ltr/min.
Presuming the diver is @ 200 meter and using his emergency bailout with a metabolic use of 1,5 liter of oxygen per minute the half closed quotation gives a FiO2 of (20l/minx0,175)-1,5 / 20l/min – 1,5 = 0,108 % resulting of a 2,27 bar pO2 at depth.

 

 

 

 

 

 

Intended use

From dive bell or UW lab.

Sport/MC/Deep/Tethered

Dimensions LxWxH

500x420x160 mm

(outside in mm)

Device weight

(12 kilo empty) 14 kilo filled

(filled+gas on land)

Intermediate Pressure

 

(IP )

Overpressure valve

11 cm – 17 cm WK adjustable

Range

Max depth

200

(mtrs)

Used material for housing/backplate

glasfibre

 

Pressure reducer

Membrane type

Membrane / Mushroom

Connection reducer – bottles

M22 x 1,5

 

Supply pressure

200 bar, minimum 30 bar

 

Umbilical connection

Yes

 

Manual bypass

Yes

 

pO2 measurement standard

No

 

Pressure gauge range

 

 

Cylinders

1 litre

 

Cylinder material

Steel

 

Cylinder thread

M22 x 1,5

 

Valve

-

 

Designed for gasmix

17,5 / 82,5 heliox

 

Co2 absorption cartridge capacity

2,5 liter

(early square form!)

Co2 absorption cartridge rechargeable

Yes by the diver

 

Co2 absorption cartridge storagetime

-

(month/year)

Co2 absorption time testing (CE)

Not CE

 

Connections Co2 cartridge

screw

 

Guaranteed absorption time

3 hours

 

Grade of absorption material

dragersorb

 

Breathing bag material

Reinforced rubber

 

Inhale bag volume

5,5 liter

 

Exhale bag volume

Total = 5,5

 

Total loop Volume

Total volume ~8,5 liter

 

Operating temperature

-

 

Magnetic signature

-

 

Colour (s)

Yellow

 

Worn

On the back

 

FFM attached

NO

(mask)

Mouthpiece valve

Yes

 

Extra info:

 

Additional information:

 

 

Email address owner:

 

 

URL owner:

 

 

If you have any information to add this sheet please mail it to jw.bech@quicknet.nl References to source and names will always be added!  

 

 
The Big difference between the Dräger SMS 1 and the Dräger SMS 1/B are two aspects. Biggest difference is the SMS 1 is supplied with ambient gas. The pressure is reduced in the diving bell where the MVB unit is located. The SMS 1/B on the other hand has a medium pressure supply of 40 bars and the pressure reduction is performed in the rebreather. Also the SMS 1/B is equipped with a manual bypass on the bottom of the glass fibre housing. Gas supply is realised by using the MVM unit.
 
SMS 1 Diagram
SMS 1/B Diagram
 

Info found:

 

Origin: http://www.therebreathersite.nl

 

Info:

 

Important features:

  • Gas supply via umbilical, 40 bar medium pressure to diver, gassupply located in diving bell
  • Mixed gas prepared in diving bell by means of the unit MVM @ 40 bar
  • Build in bailout system consisting of: Pressure reducer - CMF valve - Mix gas bottle of 1 liter\
  • Low breathing resistance due to large diameter hoses
  • Scrubber with low resistance for W.O.B and water lock
  • All parts are build in the housing made of glass fibre, worn on the back
  • Separated inhale and exhale counterlung, resulting in a cleaner scrubber bed.
  • Low resistance in the water due to compact form and small measurements of the unit.
  • Easy maintenance by replaceable parts
     
           

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