User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN 31
Innomar Technologie GmbH (2023-01) 31
After finishing all welding, the sea chest has to be cleaned and painted. To reduce reverberation
the sea chest’s walls and ceiling should be lined by closed-cell foam (10–20 mm thick, e.g.
neoprene RS components 733-6750). This neoprene foam has to be provided by the ship yard.
!
It is the solely responsibility of the shipyard to approve strength and thickness of all steel
parts building the sea chest or blister/gondola.
Ensure proper flooding of the sea chest; additional air escape route may be required.
Sea chest with flange, threaded holes and
the two (bigger) water inlet holes prepared
by the ship yard (left) and transducer
mounted into a dome/blister to prevent air
bubbles washed below the transducer (right).
Cable Routing
There are one (or more) transducer cable(s) and one ground wire to be routed from the
transducer to the topside unit. Preferably this is done via stand pipe with a diameter of at least
90 mm. Note the cable and connector dimensions given section 3.2.1 on page 26. Take care on
the connector(s) during the cable routing. Depending on the height above water level the top end
of the stand pipe might need to be sealed by ROXTEC cable sealings or similar. In any case the
sea chest needs to be vented after flooding. Since air may also accumulating in the sea chest
over time while travelling in rough sea, it’s good to have some permanent air escape route.
!
The cables should be routed to well above water level within a stand pipe of suitable
diameter (depending on connector(s) and bending radii). A ROXTEC type cable sealing
at top of the stand pipe might be necessary.
Hull-Mount Transducer Check / Antifouling
During and after installation, double check the orientation of the transducer (forward-pointing
arrow). Any mistake made will significantly reduce the system performance. Transducer and
drilling template have clear markings to indicate forward direction.
The sea chest needs to be flooded with sea water during operation. To ensure this, there are two
water inlets in the flange of the mounting frame. These two holes must not be blocked.
!
Transducer forward direction is marked (arrow) on top of the transducer.
There are 2 water-inlet holes in the mounting frame, which have to be free.
To avoid biofouling reducing the system performance, the transducer needs to be coated using
preferably a water-based primer and anti-fouling paint. INNOMAR approved products:
1 x Hempel High Protect II, 1 x Hempel Conversion Primer, 2 x Hempel Hard Racing
Jotun SeaQuantum Ultra S
International Marine Intersleek 1100SR
The anti-fouling coating should be checked and renewed at each docking, preferably every
second year.
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