Installation manual

Simrad PI54
56
851-165187 / Rev.A
Free standing hydrophone in blister
If there is no risk that hull protrusions will be fouled by the
purse wire, mounting the hydrophone in a freestanding blister is
a viable option.
Free standing hydrophone in blister:
(A) = Tilt angel
(B) = Vertical coverage area
(C) = Free standing hydrophone in
blister ( pipe diameter 200 to 250 mm)
(1) = Approximately 400 mm, minimum
250 mm is required
(2) = Must exceed 700 mm.
Should this solution be chosen, the
following must be taken into
consideration:
• The centre of the hydrophone’s beam
must be directed as much as possible
toward the bottom of the net where
the PI54 sensor(s) are located. The tilt
angle should be increased with regard
to the expected heel of the vessel.
• For a short and deep seine a tilt angle (A) of 20_ to 25_ is
recommended. For a short and shallow or large seine a 15_
tilt angle may be best.
• If monitoring of the headline under pursing is desired the
hydrophone should not be tilted more than 15_.
• For applications that require extensive coverage, regardless
of net size, several hydrophones may be installed with
different tilt angles.