Dräger SM III semiclosed rebreather

Selfmixing Mixgas Heliox Apparatus

DATASHEET SEMICLOSED REBREATHER
Dräger SM III	Date: 11 April 2005
Selbstmischendes Mischgas-Schwimmtauchgerät SM III (helium-oxygen self mixing device)	Database semi closed rebreathers by: J.W. Bech
Manufacturer	Dräger
Designer
Model	SM III
Land of origin	Germany
Design year	1960?
Special Note:	Rare rebreather
User group	Military
Magnetic characteristics	Non Magnetic/ Acoustic
Part no:
Working principle	Constant Mass Flow
Gas type	Oxygen – Helium
Oxygen is added by means of a first stage regulator with a fixed IP . Resulting in a constant oxygen flow of 3 l/min independent of the depth!
Helium is added by means of a depth compensated first stage regulator AND a second stage regulator reducing the IP above ambient pressure. (depth compensated).
The gas is mixed in a mix tube before entering the loop. The system in supplied with two switches who guard the pressure between the restrictors, in this way warning the diver when the gas flow stops.
Intended use	Military
Dimensions LxWxH	?
Device weight	?
Intermediate Pressure	?
Overpressure valve		Range
Max depth	200 meters +	(mtrs)
Used material for housing/back plate	glass fibre
Pressure reducer	?
Connection reducer – bottles	?
Supply pressure	200 bar, minimum 30 bar
Umbilical connection	Yes
Manual bypass	Yes
pO2 measurement standard	No	Lamp guarding gas flow
Pressure gauge range	0-200 bar	Lamp fitted in mask
Cylinders	1 x 1,5 litre/ 1 x 3 litre He(?)
Cylinder material	Non-magnetic
Cylinder thread	G 5/8”
Valve
Designed for gas mix	Self mixing O2-He
Co2 absorption cartridge capacity	1,5 litre(?)
Co2 absorption cartridge rechargeable	Yes
Co2 absorption cartridge storage time	?	(month/year)
Co2 absorption time testing (CE)	No
Connections Co2 cartridge	?
Guaranteed absorption time
Grade of absorption material
Breathing bag material
Inhale bag volume
Exhale bag volume
Total loop Volume	Total volume 9 litre
Operating temperature
Magnetic signature	low
Colour (s)
Worn	On the back
FFM attached	Yes	(mask)
Mouthpiece valve	Yes
Extra info:	Low acoustic signature
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!
Info found: Ake Larsson, Tauchtechnik G. Haux
Origine: http://www.therebreathersite.nl
Info: Gerhard Haux Tauchtechnik I

Oxygen is added by means of a first stage regulator with a fixed IP . Resulting in a constant oxygen flow of 3 l/min independent of the depth! Helium is added by means of a depth compensated first stage regulator AND a second stage regulator reducing the IP above ambient pressure. (depth compensated). The gas is mixed in a mix tube before entering the loop. The system in supplied with two switches who guard the pressure between the restrictors, in this way warning the diver when the gas flow stops.

This rare rebreather was designed back in the early 1960s and was used for deep-sea operations offshore and for military purposes. As documentation is narrowly available a call to anyone who has information to add to this document to send it to me. I can then add it and keep it for the readers of my website!

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