User manual
Poseidon MKVI User Manual
Appendix 2
Page 85
Decompression enabled
Once a battery module that allows decompression is inserted into a MKVI rebreather, the user
can then select whether the rig is enabled for decompression before any particular dive. If this
parameter is not set, then the battery behaves as though it is a non-decompression rig. This
feature allows the diver to decide whether the rebreather should function as a decompression-
enabled rebreather, or as a standard no-decompression rebreather, on any particular dive.
40m Deco Version
With the yellow Deco 40m battery module, the user may use the PC conguration software
tool to enable or disable decompression diving.
48m/60m Deco Trimix Version
As with the yellow Deco 40m battery module, the blue Deco 48m and the white Deco 60m
Trimix battery modules allow the user to enable or disable decompression using the PC con-
guration software tool. In addition, these battery modules allow the user to alter the diluent
gas mixture.
The MkVI will only accept “normoxic” diluent mixtures (a minimum of 16% oxygen). Helium
content is limited to 0-84% and N2 to 0-80%. Moreover, the blue Deco 48m Trimix battery
module allows dives to a maximum of 48 meters and White Deco 60m Trimix to 60 meters.
Decompression can be enabled and the gas mixtures can be altered during the pre-dive routine,
after test 44 has been reached. When decompression is enabled, the “ceiling” indicator will ash
on the LCD screen.
Maximum TTS
Both of the new “Deco” battery modules include a unique feature: the ability for a diver to set
a maximum TTS value. This feature makes it easier to plan decompression dives, because this
value determines when the system warns the diver that the limit has been reached. The gener-
ated alarm response will be similar to the alarm shown when the diver exceeds the maximum
working depth of the rig. This value also affects the way the controlling resource algorithm
(CRA) works, as described below.
Figure A2-7
Input area for Diluent mix.
Can be altered to Yes or No,
Yes = Deco rig, No = Rec rig.
Field for altering,
MAX TTS, Time To Surface.
Decompression permitted
3. Conguring the MKVI for decompression diving
The MKVI can be set up differently for different types of dives through the PC conguration
software tool. This tool can be downloaded from the Poseidon website, www.poseidon.com
The Blue, Yellow and White batteries are congured by the factory to allow decompression
diving. Once a battery module congured for decompression diving is inserted into a MKVI
rebreather, a parameter in the rebreather is set to allow (optionally) decompression diving. Only
Poseidon can set this ‘Decompression permitted’ parameter. Without the proper battery for
decompression diving, none of the parameters described below can be altered.