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When the latches are closed and the unit is sealed, the MK-III is pro-
tected from ocean spray. While the MK-III has been tested against an
overboard scenario, it is not guaranteed to be protected against full
submersion.
2. Bumper Feet: The MK-III has an additional set of Bumper Feet, al-
lowing the unit to be used from either a face up (vertical) or face out/
horizontal orientation. The face out (horizontal) orientation is espe-
cially useful when utilized on a work station or in rain or spray condi-
tions to prevent water from accumulating on the panel.
3. Lid hinges: The hinges on the back of the unit are designed to allow
the lid to be removed from the unit. While the lid is removed, the
unit can be operated while rotated 90°.
4. Safety Vents: The Safety vents can be opened by rotating counter-
clockwise. These vents must be opened if the MK-III is transported
by air, or when the unit is charging.
5. Accessory Net: Inside the lid hangs the Accessory Net. (See fig 3.)
Elastic loops mount the net to hooks built into the lid. The net can be
used to store MK-III accessories, such as the AC charger. If stowing
a headset, ensure that it is not pressing against the umbilical binding
posts when the lid is closed.
The MK-III 3-Diver Intercom provides three options for supplying power:
the internal Battery, 90-240 Volts AC, or a 12-Volt DC external power sup-
ply. The best option for you will depend on your application profile.
3.1 Internal Battery, RB-12, Non-spillable
Inside the MK-III is a lead-acid battery, which supplies 12 volts at
7.2amp-hours. Once the battery has reached less than 11.4Vdc, The unit
will shut off after 1 minute of the LED blinking red. The power shut off
occurs to prevent sudden battery malfunction or shortened battery life.
506279-000
SECTION 3
SUPPLYING ELECTRICAL POWER
9
Fig. 3
REV. A
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