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Recently I obtained a new rebreather for my collection. This German Dršger Oxy D 30 M is a half hour self rescue rebreather built in 1986. I would like to thank Nautiek Netherlands for this generous gift of a fantastic unit with a lot of smart design ideas. Please enjoy these new pictures!
 

The rebreather is delivered in a stainless steel container with a band-lock. The rebreather is designed for 30 minutes and has a constant mass flow system combined with a lung demand oxygen system. In this small container Dršger fitted a full face mask, an oxygen bottle, a refillable scrubber and even a oxygenflow timer system! The unit is designed to be used in extreme conditions.

 
 
The lock has a orange piece of plastic that break away when the unit is opened. This shows the unit need service
When the upper part of the unit is taken off the counterlung and the ffm pops out. On the mask a small cord is attached. This cord activates the oxygen timer.

The timing device, which is activated by pulling the plug while donning the mask. It is programmed to give a sound, so youíll no it is working. After a preset time, approx. 30 minutes, it give a beeping sound, assuming oxygen supply to be near itís end, so that rescuers may trace the user, provided he is still in a danger zone, and endangered by the end of oxygen supply. (this information thanks to Matthias! )

When we look in the lower part of the container we see a bourdon gauge is mounted and the valve of the oxygen cylinder. The container is supplied with a window showing if the bottle is filled with oxygen.
The valve ha a spring lock system preventing the valve is accidently closed
When the oxygen bottle is taken from the unit we can clearly see the CMF nozzle that supplies the oxygen to the loop
The container has a strong carrying strap

Here we see the oxygen bottle connected to the scrubber (gray) and the counterlung. The rubber part is the housing for the cmf and demand valve
The scrubber and the bottle are both supplied with a nitriel O-ring to mount properly in the stainless housing
When we dismantle the rubber part we see the yellow breathing tube that return the cleaned breathing gas to the mask
The upper part of the counterlung is equipped with a sealed oxygen timer. There is a red LED that clearly shows the timer is working. Unfortunately this timer was completely sealed so I could not see how it worked... Fortunately Matthias informed me about the mechanism.

The timing device, which is activated by pulling the plug while donning the mask. It is programmed to give a sound, so youíll no it is working. After a preset time, approx. 30 minutes, it give a beeping sound, assuming oxygen supply to be near itís end, so that rescuers may trace the user, provided he is still in a danger zone, and endangered by the end of oxygen supply. (this information thanks to Matthias! )

Here you see the breating tube from the mask to the sensor and down to the scrubber. You might think how the gasflow is organised. Well the next picture shows this smart design idea
Underneath the sensor three mushroom valves are fitted. Also a central valve is fitted so the gasflow is forced in one direction!
Here we see the valves that take care of the flow direction
Inside of the foldable FFM
The shows the activation of the timer. When packed in the container the pin breaks the timer circuit.
Whem the mask is pulled out the pin is pulled out and the circuit is activated.
This timer is attached direct above the valves
Here you can clearly see the total configuration.
The counterlung
The oxygen valve has a one way direction. This is achived by the locking system. The user can however close the valve
This is done by lifting the ring and turning anti-clockwise
Here you see the lung operated oxygen supply. The unit delivers 1,8 ltrs of oxygen constant, but when more oxygen is needed the counterlung will shrink and activate this microvalve. It is highly sensitive and a superb design
 
The bourdon gauge in more detail.
 
 
A key to open the scrubber is supplied with the unit.
 
The scrubber is a double walled design
Stainless meshfilters
 
 
 
The container has approximately 0,7 ltr of draegersorb
 
 
20 oktober 2008
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