Airmar P52 with Kick-up Bracket 20-035 - Manual (Page 4)

4
Checking for Leaks
When the boat is placed in the water, immediately check for
leaks around the screws that fasten the sensor to the hull. Note
that very small leaks may not be readily observed. Do not leave
the boat in the water unchecked for more than three hours.
Testing on the Water
Bracket Release Point
CAUTION: Do not set the bracket to withstand more force than
the minimum required to hold the sensor in the "down" (operating)
position, since this increases the chance that the bracket will not
release when the sensor is struck.
The correct bracket release setting has been found when the
sensor remains in the “down” (operating) position under normal
operating conditions. Gradually increase the boat speed and
observe the echosounder. When the bracket releases, there will
be an instantaneous loss of echo. Depending on conditions, the
bracket may either partially release and reset itself or fully release
rotating the sensor through an arc of 105
° .
If the bracket releases before reaching top boat speed, set the
springs in the next lower notches and reset the bracket in the
“down” (operating) position. Repeat the test until the desired
result is obtained.
Echosounder Performance
1. If there is a temperature sensor, allow a few minutes for it to
respond to a major temperature change from the air to the water.
Check for an accurate reading.
2. Become familiar with your echosounder’s performance at a
speed of 4kn (5MPH).
3. Gradually increase the boat speed and observe the gradual
decline in performance due to turbulent water flowing over the
transducer’s active surface.
4. If the decline in performance is sudden (not gradual), identify
the boat speed at which the onset occurred. Return the boat to
this speed, then gradually increase speed while making
moderate turns in both directions.
5. If the performance improves while turning to the side on which
the sensor is installed, the transducer’s position probably needs
adjustment. It is probably in aerated water.
To improve performance, try the following one at a time in the
order given.
a. Increase the sensor’s angle in the water.
b. Move the sensor deeper into the water in increments of
3mm (1/8").
c. Move the sensor closer to the centerline of the boat.
Fill unused screw holes with marine sealant.
NOTE: High-speed operation [above 35kn (40MPH)] may
require less projection in the water to improve performance and
reduce the chance that water pressure will cause the bracket to
release.
Maintenance, Repair, & Replacement
Speed Sensor
Be sure to place the bracket in the “up” (released) position before
beaching, trailering, or hauling the boat since these are the main
causes of speed sensor breakage.
Cleaning
Clean the transducer’s surface with a Scotch-Brite® scour pad
and mild household detergent taking care to avoid making
scratches. If the fouling is severe, lightly wet sand with fine grade
wet/dry paper.
If the paddlewheel becomes fouled or inoperable, unsnap the
paddlewheel assembly from the main housing for cleaning.
Severe cases may require removal of the paddlewheel. Using a
small screwdriver, remove the paddlewheel shaft retainers. (If a
retainer is lost, a dab of RTV caulk on the end of the shaft will
secure it.) If necessary, use a stiff brush or putty knife to remove
the growth being careful to avoid scratching the transducer’s face.
Wet sanding is permissible with fine grade wet/dry paper.
Sensor Replacement & Parts
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.
Replace broken or worn parts immediately. The speed sensor
shear pins are designed to fracture upon impact. 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. For a replacement paddlewheel carrier without a
cable, order the Airmar Snap-in Paddlewheel Carrier 33-105 (see
Figure 9); for an assembly with a cable, order a Transom
Paddlewheel Kit 33-110 (see Figure 10) from your marine dealer
or echosounder manufacturer.
This stainless steel bracket interchanges with the Plastic Release
Bracket 20-039 using the same mounting holes.
Obtain parts from your instrument manufacturer or marine dealer.
Gemeco Tel: 803-693-0777
(USA) Fax: 803-693-0477
email: [email protected]
Airmar EMEA Tel: +33.(0)2.23.52.06.48
(Europe, Middle East, Africa) Fax: +33.(0)2.23.52.06.49
email: [email protected]
shear
Figure 9. 33-105 Figure 10. 33-110
pins (4)
shear pins (4)
Copyright © 1995 ­ 2011 Airmar Technology Corp. All rights reserved.
AIRMAR
®
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
www.airmar.com