User manual
Poseidon MKVI User Manual
Chapter 3
Page 48
DANGER:
Do NOT attempt to use the Poseidon MKVI rebreather without
proper training! This Manual is NOT an adequate substitute for
training from a qualied Poseidon MKVI instructor. Failure to
obtain proper training prior to using the Poseidon MkVI could lead
to serious injury or death.
DANGER:
NEVER ignore or otherwise discount any of the alarm signals on
the Poseidon MKVI. Failure to respond appropriately to any of the
alarm signals could lead to serious injury or death.
Chapter 3 – Dive procedures
The most important responsibility of anyone diving the Poseidon MKVI is to monitor the alarm
systems. There are three separate alarm systems: the Head-Up Display (HUD; located on the
mouthpiece), the battery module (located on the main electronics module, behind the diver’s
head), and the Primary Display. Each of these systems is intended to get the attention of the
diver or the diver’s companions through visual, audio, and tactile signals, and convey clear
information to the diver concerning the status of the MKVI.
Monitoring alarms
HUD vibrator
Perhaps the most important alarm signal on the Poseidon MKVI is a customized version of the
patented Juergensen Marine DIVATM vibrator system, located in the HUD mounted on the
mouthpiece. There are two ways this tactile alarm may be triggered. The rst (and by far the
most important) alarm is a continuous pulsing vibration signal On-Off-On-Off...etc. This signal
has one and only one meaning: “Change the Mouthpiece Valve position NOW!”
In most cases, this signal will be triggered in association with an open-circuit bailout situation,
thereby instructing the diver to switch the mouthpiece from closed-circuit mode to open-circuit
mode. Once the mouthpiece has been properly switched, the vibrator signal will stop.
Occasionally, this signal will be triggered when the system is unable to detect the position of
the mouthpiece; perhaps because it is not completely set in one position or the other (open or
closed). If the HUD vibrator signal continues even after switching the mouthpiece, rst make
sure the mouthpiece is completely switched to the new position. If the vibration continues,
then switch the mouthpiece back to its original position, again making sure it is completely
rotated. If the HUD vibrator signal persists, then terminate the dive immediately in open-circuit
mode.
In rare cases, the vibrator is intended to prompt the diver to switch from OC position back to
CC position. This will only occur when the diluent supply is low, and the loop PO
2
is known to
be safe. The important thing is to adjust the mouthpiece position whenever it vibrates.
The other HUD vibrator signal consists of a short (1/2-second) “blip” that is triggered every 2
minutes whenever the RED HUD LED is ashing (see below), as an alert to view the Primary
Display. Do NOT change the mouthpiece position in response to a short, singular “blip” of the
HUD vibrator.