Drager dolphin

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Drager Dolphin Instructions for use

Setup and Checks

1. Ensure all parts are available and clean, parts required:
• BCD Unit
• Inhalation bag
• Exhalation bag
• Breathing Loop
• Nitrox cylinder
• Regulator
• Demand/bypass valve
• Associated hoses
• Sodalime
• Canister
• Bailout system
• Crystalube2. Fill canister
• 1/3 full, shake
• 2/3 full, shake and insert ring
• Fill to line or between o’rings, shake
• Wipe any residual Sodalime from seals and fit lid
• Shake and listen for “loose” Sodalime
• Block off either connector and blow, it should be air-tight

3. Lightly lube exhaust valve exterior and fit exhalation bag to unit,ensuring drain valves are closed
4. Fit Inhalation bag to unit ensuring drain holes are closed
5. Fit scrubber canister to bags
6. Assemble and check breathing loop:
• Ensure arrows on hoses follow direction – black to red.
• Check the “anti-collapse” rings are in place (2 per hose) at the BCD end of the hose.
• Open mouthpiece and block off “red” exhalation hoseand attempt to blow down it, this should not be possible, inhalation should be smooth
• Block off inhalation tube and attempt to inhale, this should not be possible, exhalation should be smooth.
• Close mouthpiece.

7. Analyse Nitrox cylinder and mark accordingly
8. Detach the bypass valve from hoses and fit:
• Thread the hoses through the slot in the left lowerportion of the plastic housing of the unit
• Re-fit hoses to required flow nozzle

9. Loosely fit Nitrox cylinder to unit and attach first stage
10. Attach correct flow meter to the bypass valve and turn on gas, it should be stable in the desired flow indicator rate for at least 20 seconds
11. Attach bypass valve to inhalation bag.
12. Secure Nitrox cylinder
13. Attachbreathing loop to unit and fully close the overpressure/exhaust valve.
14. Perform the negative pressure check, exhale all gas out of unit via mouthpiece and close, it should remain deflated for at least 30 seconds
15. Perform positive pressure check, inflate unit fully and place a 2Kg weight on the inhalation bag, it should not significantly deflate for at least 30 seconds.
16. Test bypassvalve, again fully exhale all gas from system and whilst breathing in, open gas supply, bypass valve should operate and it should not be unduly difficult to breathe from.
17. Close the Velcro flaps loosely so as not to restrict movement of the bags.
18. Ensure gas is turned off
19. Fit bail-out system and connect inflator and check function
20. Add weights to unit as required.


Remember that the maximum depth should be determined by the depth at which the ppO2 of the Nitrox cylinder reaches 1.4ppO2, this is calculated as follows:

1.4 = Max depth in Ata (subtract 1 and multiply by 10 to get depth in m)
O2 %

Example using EANx 40%

1.4 = 3.5 Ata (3.5-1 = 2.5 therefore max depth = 25 meters)

The O2 content of the breathing bag is used forno decompression information, this is calculated by the formula:

O2 content = (supply O2 content x Flow Rate) – O2 Consumption
(Flow rate – O2 Consumption)

Remember that the consumption rate will vary from dive to dive, and person to person. 1.5 l/min is considered relatively conservative, whilst the average is around 1 l/min. If in doubt use a higher figure.

The nozzle flow ratesare as follows (allowing for tolerances of up to 11% which is considered normal).

32% - 15.5 l/min
40% - 10.4 l/min
50% - 7.3 l/min
60% - 5.7 l/min

You can use these figures also to determine the supply cylinder expected duration, for example with a 200 bar cylinder of 5 litres capacity, using the 40% nozzle, you could expect to use the complete cylinder in the following time:

200 x 5...
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