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Fixed CCR mode
The Fixed CCR mode is intended for apparatuses with a fully closed circuit (eCCR, mCCR) that do not
have their own decompression computer but do have their own ppO2 monitor. In this mode,
decompression is calculated on the basis of strictly set partial pressure, which corresponds to the
selected setpoint on the rebreather. Maintaining the set ppO2 and timely switching of the setpoints
according to the current actual ppO2 status on the rebreather are of key importance for the correct
calculation of the decompression procedure. A preset setpoint can be switched during a dive with
the keypad shortcuts KEY1 LONG and KEY 2 LONG.
Warning: failure to maintain the partial pressure of oxygen in the values of the actual partial
pressure in the rebreather can cause serious injury or death.
Activating Fixed CCR mode
To start a dive, choose the item “Main menu/Dive/Fixed CCR”. Fixed CCR can be set as the default in
preferences, in which case your computer will be started in this mode also in the case of automatic
start of Dive mode due to an increase of ambient pressure. In addition, this simplifies the selection of
the dive mode prior to diving, as the default mode is always offered first in the “Dive” menu.
After pressing KEY1, a recapitulation of the important settings will be displayed: list of bailout gases,
water salinity (which has an impact on the precise measurement of depth), gradient factors,
decompression procedure (stops/ceiling), depth of the last stop, activation/deactivation of safety
stops, length of deep stops, current altitude above sea level (measured by a pressure sensor; this
value is influenced by weather), status of alarms, CCR mode, number of sensors, diluent composition,
SP low and SP high.
The dive mode is started after the important settings have been checked. Depth, dive time, window
for decompression stops, actual time, ascent time, currently used mixture, no deco limit/time at
stop, window for deep stop, maximum depth, CNS %, temperature, battery status, decompression
status and the selected setpoint are displayed on the detailed screen.
The No deco limit window is shared with the time at the decompression stop. At the moment of
expiry of the no-decompression time, the time spent at the first decompression stop is displayed.
Deep stop is indicated by the depth of the deep stop. At the moment of reaching the deep stop level,
the depth value changes to time data corresponding to the moment of termination of the deep stop.
The values of partial pressures are displayed in white. If a values are below the hypoxic limit, the
values are displayed in blue. If the values exceed the hyperoxic limit, the values are displayed in red.
Dive time, ascent time, depth (highlighted), maximum depth, CNS %, temperature, selected setpoint,
battery status and decompression status are displayed on the Synopsis screen (switch to this screen
using KEY1).
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