Dive Rite O2ptima Guía de usuario descargar pdf (Pagina 30)

System Overview

Before being able to dive the unit, it is necessary to understand a few basic

conventions used by the controllers, calibrate the oxygen sensors and set diver

preferences. Initially out of the factory, some common set-points are defined, all gas

mixes are programmed to AIR, and sea level is set at approximately 1840 ft above sea

level. If the data becomes corrupted or unusable, it can be easily reset to factory defaults.

The primary handset can operate using Imperial or Metric units of depth. The PO

both handsets is displayed in units of ATA not Bar, which is used by the Inspiration and

several dive computers. This variation is minimal, and conforms to NOAA exposure

definitions. The European tradition of using NOAA exposure tables but treating the

values, in units of Bar is slightly more conservative for oxygen exposures. Planning the

dive with the set-point in Bar while set-point is actually in ATA will result in a slightly

more conservative profile.

The Hammerhead electronics are unique in several ways, the key areas being set-

point switching and set-point maintenance. There are electronics that are fully automatic,

mixed, and manual only, the hammerhead offers all of these options to the diver. Closed

circuit rebreather divers typically use more than a one set-point during a dive.

Manufacturers have combated this in various ways, some have taking the standpoint that

the user is not capable of switching set-points and the electronics must do it. This

typically involves setting up two predetermined points and when a manufacturer chosen

dive depth is reached the

controller automatically adopts

the appropriate set-point. Other

manufacturers have taken the

stance that the diver should

have full control of the set-

point switching such as the

Inspiration. This puts full

responsibility for all set-point

switches squarely on the diver.

Lastly, there are fully manual

rebreathers that do no set-point holding at all, the loop composition is fully the

responsibility of the diver. The first case is probably best for the new CCR diver, while

manual set-point switches are probably the mode of choice for the experienced diver.

Fully manual rebreathers are not recommended. The Hammerhead supports all modes.

The manual mode is designed for emergency use only. The two set-point switching

modes are supported based on the starting set-point. If the diver selects a set-point that

can’t be supported on the surface, the electronics will start the dive with a set-point of 0.4

ATA, transition to 1.0 ATA at 1m, and finally the chosen set-point at 3m.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 44 45

Sin comentarios

Dive Rite O2ptima Guía de usuario Pagina 30