Dräger Ray

The Dräger Ray is a semi-closed circuit recreational diving rebreather designed to use standard nitrox breathing gas mixtures.

Construction

Harness and assembly

The soft harness has integrated over-the-shoulder counterlungs and buoyancy compensator bladder. The harness also carries a moderate sized scrubber canister on the upper back, and a single transversely mounted cylinder on the lower back. The Ray delivers a constant mass flow of gas to the breathing circuit through a Dräger Shark regulator and a metering orifice which is chosen from a small range, and which must be matched to the chosen gas mixture.

The whole unit excepting cylinders is supplied in a carrying case.

• Harness, buoyancy compensator and counterlung assembly of a Draeger Ray SCR P5167655.JPG

  Harness, buoyancy compensator and counterlung assembly of a Draeger Ray SCR back view

• Draeger Ray SCR showing scrubber canister installed P5167657.JPG

  Harness showing scrubber canister installed

• Draeger Ray SCR showing ADV connected to counterlungs P5167658.JPG

  Partly assembled Ray showing DSV connected to counterlungs. The scrubber is flipped up to show the hose routing

• Draeger Ray SCR showing scrubber and ADV fitted P5167659.JPG

  Draeger Ray SCR showing scrubber and ADV fitted and secured in place.

• Draeger Ray SCR showing scrubber and ADV fitted with cover in place P5167660.JPG

  Draeger Ray SCR showing scrubber and ADV fitted and with cover in place - back view

• Ballast weights for Draeger Ray P5167668.JPG

  Ballast weights for the Draeger Ray scrubber cover pockets

• Draeger Ray SCR showing scrubber and ADV fitted with cover in place P5167661.JPG

  Draeger Ray SCR showing scrubber and ADV fitted and with cover in place - side view

• Carrying case for Draeger Ray semi closed rebreather P5167678.JPG

  Carrying case for Draeger Ray semi closed rebreather

Breathing loop

The standard unit provides a simple dive/surface valve (DSV) with mouthpiece, but an optional DSV connects to the Dräger Panorama full-face mask using the standard Dräger P-port connection system which is also used for the connections between the breathing hoses and counterlungs, and between the counterlungs and scrubber canister. The back mounted scrubber has axial flow, and has an auxiliary P-port on the base, which can be used to connect an optional oxygen monitor cell.

The automatic diluent valve is combined with the metering orifice as a single unit which plugs into a counterlung using a standard P-port connection.

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  Dive-surface valve and breathing hoses of a Draeger Ray

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  Dive-surface valve of a Ray - details

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  Scrubber canister of a Ray

• Draeger Ray scrubber canister connectors P5167637.JPG

  Top end of Scrubber canister of a Ray

• Draeger Ray scubber components P5167638.JPG

  Components of Scrubber of a Ray

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  Interior of Scrubber canister of a Ray (without absorbent)

• Draeger Ray ADV and CMF dosage valve P5167644.JPG

  Constant mass flow orifice and automatic diluent valve from a Ray

• Components of a Draeger Ray ADV and CMF dosage valve P5167647.JPG

  Components of a constant mass flow orifice and automatic diluent valve from a Ray

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  Internal view of a constant mass flow orifice and automatic diluent valve from a Ray

Gas supply

The standard cylinder supplied with the unit is a 4-litre 200 bar steel cylinder, but it can also carry an 8-litre steel cylinder, which is about the same length but larger diameter. Standard open circuit bailout uses a Shark demand valve on the same first stage used for the metering and ADV. There is also a low pressure hose to supply the buoyancy compensator.

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  Regulator, bailout DV, CMF dosage and ADV, SPG and hoses from a Ray

• Draeger Shark demand valve P5167653.JPG

  Draeger Shark scuba demand valve used as bailout DV on a Ray

• Draeger Shark first stage regulator used on a Draeger Ray SCR P5167654.JPG

  Draeger first stage regulator used on a Ray

• Flowmeter in box as supplied with Draeger Ray SCR P5167669.JPG

  Flow meter in box as supplied with Ray

• Flowmeter as supplied with Draeger Ray SCR P5167670.JPG

  Flowmeter as supplied with Ray

• Flowmeter as supplied with Draeger Ray SCR P5167673.JPG

  Flowmeter as supplied with Ray

• Protective cover for Draeger cylinder valve for Nitrox P5167665.JPG

  Protective cover for Dräger cylinder valve for Nitrox

Operating principle

Further information: Rebreather § Semi-closed circuit rebreathers

The Ray is a simple constant mass flow semi closed circuit rebreather.