4-3
1. General
This part is intended to explain the various factors to be considered when selecting a position
for the Transducer. The siting of the CFT-780 Transducer is an important factor in
determining the accuracy and efficiency of the overall system.
The Transducer is designed to be fitted flush with the hull, along the longitudinal axis of the
ship. It measures the SOG (true speed) of the ship relative to the sea bed and the STW
(relative speed) will be measured in the water mass approximately 130 mm below the ship’s
hull. This makes it suitable to be installed on ships of all sizes.
NOTE: The Transducer is manufactured and tested with the integrated cable as one unit.
Do not cut or modify the Transducer cable! The relative speed measurement operates at a
frequency where an undefined cable length may affect performance.
JRC takes no responsibility in case of cable modification.
General mounting recommendations
Use universal thread locking liquid e.g. Loctite® 243 or equal, when mounting Studs PS
M16x40 (Part No. 71-22021-00) into flange (not grease).
Apply MoS2 grease on rest of screws threads.
Use Vaseline®, Silicone grease or similar to lubricate the Lip Seals
Recommended torque:
M10 approx. 35Nm.
M12 approx. 57Nm
M16 approx. 150Nm
After mounting just before Sea trial and at every docking, check and retighten nuts and screws
to recommended torque on the inside of the installation.
CF-780 Transducer
The Transducer comprises of one set (2 pcs) of piezo-electric elements for relative speed
measurement and one set (5 pcs) of piezo-elements grouped in a patented array for true speed
measurement. Both measurements are based on acoustic correlation principle.
The Transducer is used both for transmission and reception of the acoustic signals.
Refer to below figure “Bottom View”.
The Transducer is delivered with a 30-metre standard cable, which is permanently connected
to the Transducer head with watertight mould.
Transducer dimensions are given in below figure “Profile”.
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