Furuno Network Sounder DFF3 User Manual download pdf (Page 16)

1. MOUNTING

• A magnetic compass will be affected if the network sounder is placed too close to it. Observe

the compass safe distances noted in the safety instructions to prevent disturbance to the mag-

netic compass.

Fasten the network sounder to the mounting location with four self-tapping screws (5×20), refer-

ring to the outline drawing at the back of this manual for mounting dimensions.

1.3 Transducer

The performance of the echo sounder largely depends upon the transducer position. Select a

place least affected by air bubbles since turbulence blocks the sounding path. Further, select a

place least influenced by engine noise. It is known that air bubbles are fewest at the place where

the bow first falls and the next wave rises, at usual cruising speed.

Note: The face of the transducer must be facing the sea bottom in normal cruising trim of the boat.

1.4 Optional Speed/Temperature Sensors

ST-02MSB, ST-02PSB

1.4.1 Mounting considerations

Select a suitable mounting location considering the following points:

• Select a mid-boat flat position. The sensor does not have to be installed perfectly perpendicular.

However, the sensor must not be damaged in dry-docking operation.

• Select a place apart from equipment generating heat.

• Select a place in the forward direction viewing from the drain hole, to allow for circulation of cool-

ing water.

• Select a place free from vibration.

• Do not install near the transducer of an echo sounder, to prevent interference to the echo

sounder.

1.4.2 Mounting procedure

1. Dry dock the boat.

2. Make a hole of approx. 51 mm in diameter in the

mounting location.

3. Unfasten locknut and remove the sensor section.

4. Apply high-grade sealant to the flange of the sen-

sor.

5. Pass the sensor casing through the hole.

6. Face the notch on the sensor toward boat's bow

and tighten the flange.

7. Set the sensor section to the sensor casing and

tighten the locknut.

8. Launch the boat and check for water leakage

around the sensor.

Locknut

123

Face "notch"

toward bow.

Flange nut

Coat with

silicone sealant.

Brim

φ77

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Furuno Network Sounder DFF3 User Manual Page 16

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