NOTES (Continued)
b. If it is found necessary to take the transducer from the tube housing, first remove the self-tapping screw to allow air into the
tube, thus facilitating withdrawal.
c. During the season, periodically check the oil level in the tube and top up as necessary. Use of other liquids may damage the
transducer, for which the manufacturers will accept no responsibility.
d. When under way a constant stream of aerated water passes across the hull of a vessel. The thickness of this aerated water
generally increases with speed. A point may therefore be reached when no ultrasonic sound wave can penetrate the stream of
air bubbles with the result that no single depth indication will be given but the indicator unit will present random flashes
around the dial.
SPECIAL NOTE
With some Echo Sounders the transducer has a larger diameter stem than the hole in the housing cap. When this happens, push
out the insert in the housing cap. This will increase the hole size to 16.5mm diameter.
