Dive ow + Aow + Nitrox for some points

Just finished diving ow + Aow + nitrox, some key notes recorded, in case after diving will forget (OK, I admit my memory is not good)

Assembly :

1. Check the compressed air bottle, see the rubber ring, open the gas bottle is air, check the detection time mark
2. installing BCD , strap down one palm width
3. Install the regulator, connect the BCD inflatable tube, and straighten the line, spare two-stage head in the pocket, pressure gauges placed downward
4. Press and hold the two-level head drain twist, turn the cylinder off, turn the cylinder open and return half circle
5. Check from right to left, barometer is 200, inflation BCD is normal, two-stage head and standby two-stage head is breathing smoothly, two-stage head respiratory pressure gauge should not change greatly, gas odor

Dive Companion Check :

　　 B: Check the BCD inflatable air vent Blow

　　W: Check the counterweight

　　R: Check five buttons

　　A: I blow the two-level head with the same blow back two head, to see if there is a large change in the pressure gauge, check whether the cylinder is open

　　F: Check if the face mirror is on the neck, fins are ready, and check the lights on the D-Ring when night dives

Launching :

• Step into the water: the right hand hold the breathing head, the right hand hold the face mirror, the left hand hold the counterweight, after launching the BCD
• Back roll water: the right hand hold the breath head, the right hand finger hold the face mirror, the left hand to protect the back, the water charge BCD

High oxygen:

• Precautions:

High oxygen compressed air bottle rubber ring and ordinary gas cylinder different attention inspection, explosion-proof anti-blast

• calculation can go to depth:  

high oxygen concentration limit 1.4 1.6, 　　 Nitrox bottle concentrations generally at 32% ordinary oxygen concentrations in 21%,

(　　 1.4/0.32-1) * ten = 33M ,

1 of which refers to an atmospheric pressure on the horizontal plane.

CESA:

　　No gas within 9 meters depth and no companion

Take a deep breath, exhaust the left hand, raise the right hand, look up, continue to exhale, up to the water to the BCD blow gas

Dive ow + Aow + Nitrox for some points