JRC JMA-3300 Series, Installation Manual

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Chapter 2 INSTALLATION OF THE SCANNER
2.2 INSTALLATION PROCEDURE
2-9
2
NSTALLATION
MANUAL

Installation and clamping method

Installation direction
Installation should be done so that the cable gland is oriented toward the stern.

Bolts, nuts and tightening torque to be used
 Use stainless steel bolts for the scanner and uniformly tighten all of the bolts using
double nuts for each bolt so that the scanner will not become loose (Table 2.2-1).
 Although the length of the bolt will differ according to the thickness of the mount
base, use a bolt long enough so that more than 4 millimeters of thread protrudes
beyond the double nuts after the double nuts have been tightened.
Table 2.2-1 Length of scanner mounting bolts and tightening torque
Thickness of Mount Base Bolt Torque (N-m)
X band 12 M10×55 (mm) SUS304 40

Use of washer and corrosion-resistant measures
 At the location where a bolt's head or nut comes in contact with the scanner chassis'
legs and the mount base, insert a plain washer which fits the bolt; and, at the location
where the nut comes in contact with the plain washer, insert a spring washer, and
then securely tighten the nuts (Fig. 2.2-3).
 To prevent corrosion due to the contacts between different metals, such as the
scanner chassis' legs, installation surface, bolts, nuts, etc., cover the bolt's head and
nuts with sealant (Fig. 2.2-3).

Grounding and corrosion-resistant measures
 Do not install the scanner in place where puddles are often formed.
 Ground the scanner chassis and the installation surface (hull) by using an earth line.
Apply sealant to the connection portion of the earth line to prevent corrosion and
damage by vibration (Fig. 2.2-4).