Jeff Johnson

The advantages of nitrox are well known. By increasing the level of oxygen in the gas we breathe, the nitrogen in the mix is reduced, so we absorb less N2 under water. This means longer no-stop or shorter deco-stop times. However, with any particular nitrox mix there is a maximum operating depth (MOD) determined by […]

complete loop set incl canister lid and scrubber O ringsHose @ T piece (12 to a set)convoluted hose endsMouthpiece ends (4 to a set)Mouthpiece Seal (1)Manual Inflate 3 O ring sizes x (2 sets)O2 solenoid connection (1)

Although a rebreather adds another “layer” to the open circuit system, in no way is it complicated or difficult to maintain. Upon initial exposure a student may exclaim ” oh my, this is going to take some time “. In reality the maintenance, setup, breakdown and cleaning requires approximately the same amount of time as

Oxygen Cleaning Controversy First let me state plainly that i am NOT making an explicit statement of fact or setting specific protocols here for oxygen cleaning.I am only making observations as to the multiplicity of and variations to standards within and outside of the scuba industry.For instance i observe that: no other industry but scuba

This list is the absolute minimum equipment required for ALL advanced or technical courses. New, more modern or changed technique may require additional equipment. Discuss this list with your instructor.This list was generated so that the student could price equipment and understand the approximate total cost.

The O2ptima FX comes standard with the following features (request tech specs for details): Over-the-shoulder counterlungs Juergensen Marine Hammerhead Electronics Heads-up-display (HUD) Display Integrated Vibrating Alarm (DIVA) Dive Surface Valve (DSV) Automatic Diluent Valve (ADV) Water traps Regulators and hoses AI R22 Oxygen Sensors

What it Does or Does not do: Does NOT necessarily make a product safer or better than another “unmarked” product DOES set minimal standards which creates a “baseline” for safety DOES increase “time to market” of new, upgraded, improved or modified products To date the Dive Rite Optima CE rating is moving forward toward approval.

Prerequisite(s):  CCR course: Advanced Nitrox  (may be taken in conjunction with CCR course) Training limit: 130 ft   Maximum Depth after training: 130 Training limit of 150 ft.  Maximum depth after training 150 Prerequisite: Advanced OW and reasonable dive experience. recommended: Advanced Nitrox: may be taken in conjunction with Double cylinders w/ dual outlet manifold required.

Lead Instructor Jeff Johnson N.E. Regional Training Director IANTD Began technical and cave diving 1989              Technical Instructor rating: 1997 eCCR rating 2000: holds ratings on 8 different rebreathers to date Advanced Nitrox Instructor Trainer: 2003 Closed Circuit Rebreather instructor 2003 Expedition trimix Instructor to 400 fw  2008 Contributor to design and implementation of IANTD