Manual BandG Ultrasonic Speed Sensor (page 15 of 17) (English)

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ULTRASONIC SPEED SENSOR

1.10 Maintenance

The retractable sensor units are supplied with a blanking plug, which must be

used when the Ultrasonic Speed transducer is removed for inspection,

maintenance, replacement or storage.

Removing the Ultrasonic Speed transducer from the ‘Flapper-Valve’

housing:

Inspect and lubricate the O-ring seals on the blanking plug using silicone

grease or petroleum jelly. Remove and discard the safety wire (Refer to Figure

1.6 on Page 1-9 of this manual). Remove the safety ring from one end of the

retaining pin. Using the remaining safety ring, withdraw the retaining pin from

the flapper-valve housing. Hold the blanking plug in one hand, with the other

hand pull the transducer out of the flapper-valve housing and replace it with the

blanking plug. Seat the blanking plug in place using a twisting motion until the

key fits into the notch in the housing. With practice, only a small amount of

water will enter the boat. Refit the retaining pin and safety ring.

Refitting the Ultrasonic Speed transducer is a reversal of the above procedure.

Note: ensure that the key on the transducer is correctly located in the notch on

the flapper-valve housing before fitting the retaining pin and pull ring. Secure

the assembly as previously described with new locking wire.

Cleaning the Ultrasonic Speed transducer

: Aquatic growth can accumulate

rapidly on the transducer surface reducing performance. Clean the surface with

a soft cloth and mild household detergent. If fouling is severe, use a stiff brush

or a putty knife. Take care not to cause scratches on the transducer face. Wet

sanding using fine grade wet/dry paper is permissible to remove stubborn

deposits.

Antifouling paint

: Surfaces exposed to salt water must be coated with

antifouling paint (refer to figure 4), Use only water-based antifouling paint.

Solvent-based paints must not be used. Solvent-based paints contain

‘keytones’ which may attack the plastic surfaces and damage the sensor. Re-

apply the antifouling paint every six months or at the start of each boating

season.

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BandG Ultrasonic Speed Sensor Manual

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