Owner`s manual

2
O ptima FX Owner’s Manual
Ch. 1 Pg. 3
Copyright, Dive Rite All Rights Reserved January 2009
packed loose granules or a disposable cartridge. There
are two main types, Radial and Axial.
Semi-Closed Rebreather
SCR A type of rebreather where the breathing loop is isolated
from the environment. During normal operation some
percentage of the gas is periodically or continually vented
and replaced with fresh gas (usually Nitrox). The most
common SCR is one with a constant preset gas flow but
SCRs keyed to the diver’s respiratory rate do exist.
Work Of Breathing The amount of effort required by the diaphragm to move
breathing gases in and out of the lungs.
Common Acronyms
ADV Automatic Diluent addition Valve
BOB Bail Out (re-)Breather
BOV Bail-Out Valve, a Dive/Surface Valve with an OC integrated second stage,
aka OC/DSV
CC Closed Circuit
DSV Dive/Surface Valve
DV Demand Valve (usually refers to a second stage)
EAD Equivalent Air Depth
EAN (EANx) Enriched Air Nitrox
eCCR Electronically controlled CCR
END Equivalent Narcotic Depth
FFM Full Face Mask
FSW Feet of Salt Water
HP High Pressure
LP Low Pressure, in Europe Frequently referred to as MP
MAV Manual Addition Valve (Oxygen / Diluent)
mCCR Manually (or mechanical) controlled CCR
MOD Maximum Operating Depth
MP Medium Pressure, Term used in Europe, Equivalent to LP in the USA
MSW Meters of Salt Water
OC Open Circuit
OC/DSV a Dive/Surface Valve with an OC integrated second stage, aka BOV
OPV Over Pressure Relieve Valve
OTU Oxygen Toxicity Unit
PP Partial Pressure
PSI Pounds per Square Inch
RMV Respiratory Minute Volume