Hollis Explorer User Manual - page 32
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AUTOMATIC TURN ON
FAILSAFE FEATURE
Normal practice and training is for the user to turn the EXPLORER on by
depressing any button on the wrist display and going through the pre-dive
checks. The following failsafe additions are to reduce the chance of acci-
dental injury or death by breathing on an EXPLORER that is in off/sleeping
state.
EXPLORER uses detection of a diver breathing the loop to automatically
turn the unit on.
BREATHING DETECTION TURN ON RULES
The EXPLORER will turn on if the loop PO
2
drops to 0.17bar. Therefore
even with the unit incorrectly assembled (gas not turned on), the system
will detect the fall in PO
2
and will activate. It will then alarm and require the
user to properly complete the pre-dive sequence.
Once turned on, the LSS unit will attempt to maintain a breathable PO
2
based on the DCP (Dive Control Parameter) setting and the supply gas
expected.
If sensors are removed or read 0.00 then the unit will only turn on with
depth or by the user pressing a switch. This feature is included to conserve
battery power when the user takes out O
2
sensors for storage or during
transport. Other errors such as failing to turn on cylinders, etc. are much
more likely, and should be reduced by proper training and the intelligent
alarm systems as in the EXPLORER.
If the diver does not have HP gas turned on, alarms on the HUD/BUD and
Wrist display will occur as soon as auto turn-on occurs. Hence this method
provides increased warnings whenever the loop is breathed on with the
unit turned off.
Breathing the loop, in all circumstances where the unit is breathable and
O
2
sensors operative, will trigger an automatic turn on.
!
DANGER: The additional safety features described in this section
should NEVER be used as routine. The user should ALWAYS turn
on the unit and complete pre-dive checks as required in training
and the operations manual.
3.
2