Edition: 2021-01-29
Page 13 of 14
ETNSTCI/ETNSTCILF Installation Manual
9. Bleeding the tank
After undocking of the ship, it may be necessary to open the cable gland on top of the cable pipe to bleed out
the air to ensure that water will ll the transducer tank. If the tank is not lled with water, the performance of
the transducer will be heavily reduced.
Note: Air can be trapped inside the tank due to aerated water/airbubbles from heavy seas, thrusters etc.
Routine for bleeding the tank /cable pipe should be considered.
The message “Lost bottom” on the echo sounder screen, in conditions where the sounder should see the
bottom, may be an indicator that the tank needs bleeding.
SKIPPER Electronics AS
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