HDV R 14 1.1
Due to constant technological advancement, the manufacturer may modify the content of this manual without prior notice.
18
18 Hazardous area and residual risks
The propeller is protected by an external radial circular band. Therefore it is exposed on
both the suction and expulsion sides. Additional protections were not installed in these
areas since they would significantly reduce fluid passage in the conduit, drastically
reducing propulsion system performance. A protection grill on the flow suction side can be
easily clogged when near aquatic plants or algae normally suspended in the water, forcing
the diver to frequently stop to clean the grill which is not always possible in safety
conditions underwater. A grill placed on the flow output side would prevent any cords or
lines caught in the propeller to be removed, inhibiting HDV operations. This would
frequently distract the diver and cause him to forget that the greater hazard is represented
by the surrounding environment and diverting the his main focus away from the dive. For
the above reasons and, considering that the propeller is protected by a safety clutch, we
believe that the natural behaviour of being careful not to place hands or other body parts
between propeller blades is safer for the diver (who in correct use, is always behind the
propeller) than being distracted by cleaning and untangling any objects from the grills
around the propeller.
Catching and cutting risk
Do not introduce any object or body part in the flow conveyor in contact
with rotating propeller blades. Except for the hand on the trigger, keep at
least 40 cm away from the propulsion group during use.
A CAP OR OTHER HAIR RESTRICTION DEVICE MUST BE WORN BY
DIVERS WITH LONG HAIR. LONG HAIR MAY BECOME ENTANGLED IN THE
PROPELLER IN THE EVENT OF IMPROPER USE.
ALSO BE CAREFUL OF ANY OBJECTS SUCH AS FISHING LINES, DIVING
EQUIPMENT, FLOATING TOYS OR ANYTHING ELSE THAT MAY COME NEAR THE
PROPELLER.
PROTECTIVE GLOVES MUST ALWAYS BE WORN
Crushing risk
When closing the tube or shell, be careful not to insert fingers between
the two parts.
NEVER LEAVE THE HDV UNATTENDED ESPECIALLY NEAR
CHILDREN OR AMATEURS. ALWAYS TURN IT OFF BEFORE
EXITING THE WATER AND DISCONNECT THE BATTERY AS SOON
AS POSSIBLE (see previous chapters).
18.1
Safety device
A torque-limiting device is installed between the motor and the propeller. When the
resistance felt by the propeller exceeds a certain torque, this device intervenes, preventing
the propeller from rotating.
The device will generate a rhythmic sound signalling its insertion. If this
situation occurs, release the trigger immediately, switch off the power by
means of the main switch and free the propeller of the foreign body.
Do not leave the torque-limiting device inserted for more than 10
seconds. It has been conceived for emergency purposes and may be
damaged by prolonged use.
