Testreport
Caution: The following report reflects my experience purely personal experience and can not be interpreted as instructions for oxygen diving. Whether and how you use these experiences must decided the reader !
Advantages:
- Extremely simple and cheap construction
- No direction valves
- Easy to purge
- soda lime containers breathing lapped, well insulated against the cold environment
Disadvantages:
high dead-space
Scrubber
The scrubber of pendulum rebreather works by the double use obviously very effective. With one filling of soda lime of approximately 1.25 Kg, I usually three dives. The dive times are usually 3 hours. So far occurred to me absolutely no problems with CO2 (hypercapnia) on. The high dead space has made me no noticeable impact. Scrubber worktime around 3 + hours in warm water and low work.
Soda Lime:
So far, I have DiveSorb (Draeger without indicator), Sofnolime (Molecular with indicator) and Drägersorb 800 (Draeger with indicator) used. In use, I could detect no difference.
Breathing bag:
The material has proven to be mechanically proved very resistant. All adhesive compounds are permanently. The volume is large enough to control the buoyancy, which means I control the bouyancy exclusively with the breathing bag. The loaded sponge cloths suck the condensation and eventual leak water well. Liquid water is after a one hour dive not included.
Respiratory comfort:
Due to the location from the lung on the breast is the inhale resistance larger than the exhale resistance (at the RG-UF / M is the inverted). Nevertheless, I feel that the breathing resistance lower than the total RG - UF / M. Dive you you in an upright position with the feet down, a slightly higher pressure, than for me after lengthy dives leads to the nose involuntarily leave pressure must. In normal position is the excess pressure in the system is very low. In direct comparison to other rebreather (CCR) - very easy breathing!
Oxygen:
Lately, I use exclusively technical oxygen. Compared with medical (in germany), I could detect no difference. Is currently being filled by overflow of 300 bottles (or with big 200 bar) or from 200 bottles in conjunction with my booster.
Handling with PPO2 gauge:
Before start the dive I make the breathing bag empty , I exhale deeply, then I fill the breathing bag and breathing further from the closed loop. One purging! It will be achieved an oxygen fraction in a loop of about 65-70% . This fraction also changes during the dive not relevant. On a periodic purging I can renounce. I not use a overpressure valve, the reduce of overpressure is very light possible over the mouth or nose as needed. Without measuring PPO2 I purging the system several times.
Maximum diving depth:
Aimed after purging factor and personally accepted maximum PPO2. The generally accepted safe limits of 1.6 is, to above procedures, at 10 - 11m arrive. This area is also exploited by me, but the main part of dives is up to about 8m . Jo - Jo dives are avoided, cause the blow of gas when I again dive deeper by pure O2 will be replaced. When diving without measurement, I never dive deeper than 6-7m.
Supplement: Pendelatmer as MCCR
The manual gas mixing on the RGU Regulator with blocked nozzle works very stable. When you dive down I admix air and the PPO2 values remain constant. The dual display shows PPO2 very stable. The values remain at normal swimming very constant, it is not necessary to constantly to correct. I try not the PPO2 constantly exactly adjust, but "something" from 1 to 1.3. Of course .... the steady check is essential for your live! So far the Pendelatmer tested up to 21m. All of these dives were without any of the known symptoms - despite pendulum breathing.
Conclusion:
Fun Device, very well suited for observation or photo dives in German, botanically interesting, lakes in the area above the thermocline. MCCR times as well for a slightly deeper "control view", or to reduce the contamination of oxygen in ordinary O2 depths .
Oxydiver in August 2005 / Update MCCR January 2007
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