Installation manual

Simrad PI54
102
851-165187 / Rev.A
Hydrophone protection
Warning: Do not perform hot work near, paint, scrape, hit,
pry, force, sandblast, high-pressure wash or
otherwise subject hydrophones to excessive
force.
Installation precautions
The following precautions must be observed. Failure to do so
can result in damage to the trawl hydrophone which may render
the PI54 system inoperative.
1 Do not install the hydrophone until all hot work is
complete!
2 Do not over-tighten the packing nipple as this could
damage the hydrophone’s cable!
3 Observe the maximum allowable torque warning of 5 Nm
when tightening hydrophone studs!
4 Use only stainless steel M8x35 socket countersunk head
screws f or mounting the hydrophone!
5 Secure threaded hydrophone hardware with Loctitet 270
or the equivalent!
6 The PI54 cabinet should always be connected to the ship’s
ground to reduce the effects of electrical interference on
the system!
Under installation
Hydrophones must not be installed until all structural work,
specifically welding sandblasting and other potentially harmful
operations are completed. If hot work, sandblasting, spay
painting or water blasting is to be performed in the vicinity of a
hydrophone it must be properly protected. PI54 hydrophones
although very rugged, contain sensitive ceramic elements and
electronic circuits and therefore should never be struck, prided,
clamped or subject to other types of potentially damaging force
as for example over-tightening mounting hardware.
Deflection plates
Simrad recommends that hydrophones m ounted in blisters be
protected by rope deflections plates both forward and aft. Such
precautions will help protect the hydrophones, especially in the
event the vessel passes over a wire, line or net.