AIRMAR
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
■
www.airmar.com
4
Copyright 2003. All rights reserved.
Checking for Leaks
Warning
: When the boat is placed in the water,
immediately
check for leaks around the screws and any holes drilled in the hull.
Never install a sensor and leave the boat in the water unchecked
for several days.
Operation, Maintenance
,
Repair,
& Parts
Releasing the Sensor
•
Before installation
—If the sensor is snapped onto the bracket
but not secured to the hull, use this method. Release the sensor
upward by inserting a 3mm or 1/8" blade screwdriver into one of
the slots on the side of the sensor (see Figure 8).
Be sure
to
insert the screwdriver a full 19mm (3/4") into the slot. Lift up on
the handle of the screwdriver while lifting up on the transducer.
Caution
: The blade of the screwdriver must not exceed 3mm or
1/8". A larger screwdriver can not be inserted far enough to
prevent damage to the transducer housing.
•
After installation
—The sensor releases easily when it is fastened
to the hull. Give a sharp blow to the bottom of the transducer using
the palm of the hand.
Caution
: Never strike the transducer with anything except the
palm of the hand. Never strike the speed sensor.
Antifouling Paint
Marine growth can accumulate rapidly on the sensor’s surface
reducing performance within weeks. Surfaces exposed to salt
water that do not interlock,
must
be coated with anti-fouling paint.
Use
water-based
anti-fouling paint only.
Never
use ketone-based
paint, since ketones can attack many types of plastic possibly
causing damage to the transducer. Apply paint every 6 months or
at the beginning of each boating season.
Cleaning
Clean the transducer with a soft cloth and mild household
detergent. If fouling occurs, use a stiff brush or putty knife to
remove the growth
being careful
to avoid scratching the
transducer’s face. In severe cases, wet sand the paddlewheel with
fine grade wet/dry paper.
Servicing the Speed Sensor
If the paddlewheel becomes fouled or inoperable, it can be
removed for cleaning. Remove the two screws from the speed
sensor (see Figure 9). Slide the speed sensor upward to remove it
from the transducer housing. Grasp the paddlewheel and pull to
access the shaft.
Caution
: The paddlewheel must be oriented correctly to measure
boat speed.
After cleaning, slide the paddlewheel onto the shaft (see
Figure 7).
Orient the short side of the paddlewheel blade as
shown on the side view
. Fit the shaft into the holes in the retaining
bars. Slide the assembly into the speed sensor housing. Re-
attach the speed sensor.
Parts
Replace broken or worn parts immediately. The water-lubricated
paddlewheel bearings have a life of up to 5 years on low-speed
boats [less than 10kn (11MPH)] and 2 years on high-speed
vessels. Some depth/temperature units can be upgraded by
adding a speed sensor. Purchase parts from you marine dealer or
instrument manufacturer.
Part
Part Number
Paddlewheel Kit
33-473-01
Bracket Kit
33-477-01
Speed Sensor Kit
33-478-01
Sensor Replacement
The information needed to order a replacement sensor is printed
on the cable tag.
Do not
remove this tag. When ordering, specify
the part number, date, and frequency in kHz.
Figure 8. Releasing the sensor
slot (2)
Release the sensor by
inserting a 3mm or 1/8" blade
screwdriver in one of the slots.
Lift up on the handle of the
screwdriver while lifting up
on the transducer.
Caution
: Insert the screwdriver
a full 19mm (3/4") into the slot.
before it is secured to the hull
screwdriver
Figure 9. Servicing the speed sensor
side view
retaining bars
short side of
paddlewheel
shaft
BOW
blade
housing
actual siz
e
actual siz
e
