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Semi Closed Rebreather cable link
In Open Circuit mode with the I/O connector activated and the cable linked to an
external oxygen cell located within a semi-closed circuit rebreather, your VR will read
semi-closed circuit decompression.
Calibration: calibrate as per the analyser instructions.
Operation: If you have purchased and installed the PIN to activate the VR’s I/O
connector, in the Dive Options screen (accessible by scrolling through the Mini
screens in the Home Screen) you will be able to move the highlight to the XFunc and
XDec features via successive short pushes of both switches.
To activate the VR for use with a rebreather link cable, with the highlight under
XFunc use short pushes of either switch to bring up XO2.
Then, with the highlight under XDec use a short push of either switch to bring up ON.
An Open Circuit VR computer with XDec set to ON will give you semi-closed circuit
decompression based on the external cell readings.
In this mode, the current fraction of oxygen in the mix as read by the cell, preceded by
X (e.g. xNx30 for Nitrox 30) the Home Screen and the Dive Screen will display. Also
displayed will be the adjusted mix Please note that although actual decompression
will be based on the external FO2 reading, the look ahead time to surface (TTS)
calculation will be based on the ON gas selected in your gas list. So that the prediction
will be as close as possible to actual decompression the ON gas should be set as your
anticipated FiO2, calculated using the semi-closed equation.
VR Dive Computer Operations Manual 2009 rev E 28/01/2009
61
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