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350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 10 of 14
approximately one metre above the lowest point on the ROV. Allow a minimum dis-
tance of 0.5 metres between the coil triads and the ROV body.
Figure 3–4 shows the coil mounting kit with the following items:
A mounting bar 2.0 metres long with a cross-section 72 × 70mm.
There are flat surfaces machined into the bar. These extend for a distance of
500mm from both ends so that, in these areas, the bar has an octagonal cross-
section.
The bar has a receptacle groove 170mm long machined at the centre of one face.
Make certain this receptacle is at the bottom when you install the bar onto the
ROV. The receptacle is there to accept a small TSS altimeter if the System
includes one.
Two clamping blocks identical to those used in the coil assembly (item H in Figure
3–3).
Eight M8 × 50mm A4 stainless steel bolts. These are identical to items L in Figure
3–3.
Coil mounting method:
Note that when properly mounted both coil triads have:
Their vertical coils towards the front of the ROV, with their connectors at the top.
Their fore-aft coils farthest from the ROV centre-line with their connectors pointing
towards the rear.
Their lateral coils in the top groove of the centre block, with their connectors point-
ing inboard.
1. Use stainless steel U-bolts to attach the mounting bar to the front of the ROV.
Adjust the mounting bar until it is level and centred relative to the ROV. Tighten
the U-bolts firmly to stop the bar moving or vibrating during survey operations.
2. Fit the port coil triad to the port end of the mounting bar where the machined flats
give the bar an octagonal cross section. Locate the coil assembly so that the
mounting bar engages in the lateral groove at the bottom of the centre support
block. The coil triad will be a very tight fit against the mounting bar and
might be difficult to install. There are arrows on the coil identification label to
show the forward direction of the coil triad.
3. Use a clamping block to secure the bottom of the port coil triad to the mounting
bar. Use a 6mm hexagonal key to tighten the four M8 bolts lightly. Do not tighten
these bolts fully until you have installed the complete coil array and you have set
the coil separation distance.
4. Follow the same procedure explained in paragraphs 2 and 3 above and fit the
starboard coil triad to the starboard end of the mounting bar.
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