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Glossary
Absorbent: chemical media used to remove CO2 from exhaled gas.
Absorbent Scrubber Pack: Mechanical assembly where the CO2 absorbent is housed.
ADV (Automatic Diluent* Valve): a mechanical valve that automatically adds fresh gas to the
counterlungs in response to increased ambient pressure from depth or decreased volume.
Bailout: a redundant gas supply system.
Balance Tube: The tube between the exhale counterlung and the LCV. This tube removes
water from the counterlung and controls (breathing) loop pressure with the LCV.
BUD (Buddy Universal Display): Universal display on the side of the LSS module, codes
identical to HUD.
BCD (Buoyancy Control Device): the harness/buoyancy compensator assembly.
BOV (Bail Out Valve): a valve that allows for the switching from closed circuit mode and open
circuit mode (via a built in second stage regulator) breathing.
Breakthrough: The moment when absorbent scrubber fails, no longer removing CO2 at an
adequate rate.
Breathing Hose: The large hoses that connect the Canister assembly to the BOV.
Breathing Loop: the portion of a rebreather through which breathing gas circulates.
Canister: Mechanical assembly where the Absorbent Scrubber Pack is housed.
Caustic Cocktail: very alkaline liquid (water mixed with CO2 absorbent material).
CC: closed circuit mode
CO2: carbon dioxide
Dive Control Parameter (DCP): The control to define how high the oxygen level is set for the
dive profile.
eSCR (electronic Semi-Closed Rebreather): a semi-closed rebreather that utilizes electronics for setpoint maintenance.
Exhale Counterlung: The counterlung positioned behind the diver’s right shoulder.
FO2: fraction of oxygen
Graphical User Interface (GUI): The display system for communicating information to the
diver.
Heads Up Display (HUD): The LED display positioned in front of the mask.
HP: high pressure
Inhale counterlung: The counterlung positioned behind the diver’s left shoulder.
IP: intermediate pressure
*(The use of the word diluent is a misnomer carried over from a component used in closed
circuit rebreather diving that operates in a similar fashion. In the Explorer the ADV does not
dilute the gas but instead enriches with nitrox gas.)
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