Chapter 4: Diving With The Revo; Considerations Prior To Each Dive; Pre-Dive Checks - rEvo Rebreathers rEvo III micro FT Use And Maintenance Manual

Manual rEvo III

Chapter 4: Diving with the rEvo

4.1: Considerations prior to each dive:

* Check the remaining scrubber time: if the time the scrubber has been used and the
planned dive time added up exceeds 160 minutes, refill both scrubbers with fresh
material.
* Analyse the contents of both the diluent and oxygen cylinders.
* Check the pressure of both cylinders: is it sufficient for the planned dive, even
taking into account a worst case scenario?
* Are the batteries of the rEvodreams OK? (did you see a battery indication on the
display of the rEvodreams during the previous dive?) If so, replace the batteries, be
careful to avoid doing this at the dive site: avoid at all times the possibility of humidity
entering the rEvodream's housing.
4.2: Pre-dive:
* Assemble the regulators.
* Mount the moisture absorber in the inhale lung.
* Be sure that the scrubbers are mounted correctly in the rebreather. Make sure that
the inside walls of the scrubber housings are clean, if necessary clean them with a
clean towel or lint-free cloth.
* Before replacing the cover, check the general condition of the O-rings. If necessary,
clean and grease them.
* Check the correct functioning of the mushroom valves within the breathing-hose
assembly: open the mouthpiece, use the palm of your hand to block the exhale side
(block the opening of the red connector) and breathe into the mouthpiece: no gas
should leave your mouth. Now use the palm of your hand to block the inhale side
(black connector) and suck: no gas should enter your mouth. Now close the
mouthpiece, block the exhale side with your hand and blow into the inhale side (black
connector): no gas should escape from the mouthpiece. Block the inhale side and suck
at the exhale side (red connector): no gas should enter the mouthpiece.
* Assemble the breathing-hose: check the O-rings, if necessary clean them and apply
some grease. Pay attention to the correct connection of the breathing-hose: the red
connector in the p-port with the red button: the gas flow goes anti-clockwise from
right to left.
X from here: use the checklist !!!!!!!!!!!!!! see addendum!
* Do a negative test: make sure that both cylinder-valves are closed, 'vacuum' the
rebreather completely, create underpressure resulting the breathing hoses to be
contracted and close the mouthpiece: wait for 2 minutes and open the mouthpiece
again: there must be a clearly audible 'hiss'. If not, check the rebreather for leaks!
(important: never do a negative test when the scrubbers are not installed: this will
dislocate the counterlungs as they will be 'sucked' into the space of the scrubber
canisters)
* Check the correct functioning of the orifice: open the oxygen valve SLOWLY and
check if there is no leak there where the oxygen regulator first stage screws into the
cylinder valve. Close the valve and note down the time necessary for the oxygen
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