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MB1
User Manual
4
INSTALLATION
4.1
Mounting the Sonar
There are three main methods of mounting the sonar:
(a
Using M6X1.0 threaded holes in the top of the sonar housing
(b)
Using M6X1.0 threaded holes on the sides of the base of the sonar housing
(c)
Using an optional universal mounting plate
Most commonly the unit is mounted over the side of the vessel, using a suitable pole and flange
arrangement. It is important in this case to avoid any movement in the sonar in relation to the other
sensors such as the motion reference unit (if it is not internal to the sonar) and the positioning system.
Caution: Ensure that the cable of the unit is facing aft (toward the rear of the
vessel) during normal operation.
4.1.1
Mounting the Sonar Using Threaded Holes in the Top of the Housing
The sonar is supplied with a mounting arrangement consisting of 4 threaded nickel aluminum bronze rods
that run through the top of the Acetal copolymer cap. These are threaded for M6X1.0 bolts. Hole pattern
is shown on the outline/installation drawing. To mount the sonar, first pre-drill holes in a suitable flange
attached to the mounting pole. Then thread the bolts through the flange, into the threaded holes in the
sonar head. For a more secure fit, locking washers or threadlocker may be used. Only use 316 stainless
steel bolts in this mounting configuration. Using bolts made from different material may lead to corrosion
and loss of instrument. Care is to be taken to avoid over-tightening the bolts into these rods, torque bolts
to 35 in-lb. Care should also be taken to use bolts that are the correct length for the mounting plate
thickness and the thickness of the rods – the bolts should not penetrate through the rods into the Acetal.
Try to pick a bolt that will penetrate 0.5in into the sonar housing – this will ensure best possible thread
engagement without bottoming out the bolt in the hole. Note: if the threaded hole in one of the bronze
mounting rods is stripped, this rod could be replaced by removing the M3X0.5 screw holding the rod to
the plastic housing cap and sliding it out of the housing cap. New rod is installed in reverse order, use
Loctite 222 threadlocker on the M3X0.5 screw and torque it to 4 in-lb.
Caution: Ensure the correct length of bolts are used when mounting directly to the
housing - over tightening longer bolts may cause damage to the housing resulting
in the flooding of the unit
4.1.2
Mounting the Sonar Using Threaded Holes in the Base of the Housing
Titanium base of the sonar has 4 threaded M6X1.0 holes on each side. Hole pattern is shown on the
outline/installation drawing. Only use titanium bolts in this mounting configuration. Using bolts made from
different material may lead to corrosion and loss of instrument. Care is to be taken to avoid over-
tightening the bolts, torque bolts to 35 in-lb.
Page 21 of 37
7/6/12
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