INSTALLATION INSTRUCTIONSOWNER’S GUIDE &
Thru-Hull, Retractable with Valve
Ultrasonic Speed & Temperature Sensor
Model: CS4500-610
U.S. Patent 6,426,918; 6,671,225; 6,678,208. EP 1 634 087
Follow the precautions below for optimal product
performance and to reduce the risk of property
damage, personal injury, and/or death.
WARNING: The ultrasonic insert must be installed in
a housing with a valve.
17-263-01 rev. 02 04/12/11
WARNING: Always wear safety goggles and a dust
mask when installing.
WARNING: The power must be ‘OFF’ before proceeding.
WARNING: The power supply voltage must be
WARNING: A safe installation requires a 0.5 amp fast
blow fuse or circuit breaker.
WARNING: The valve is not a watertight seal! Always
use the insert or blanking plug secured with the safety
wire for a watertight seal.
WARNING: The o-rings must be intact and well
lubricated to make a watertight seal.
WARNING: Always attach the safety wire to prevent
the insert or blanking plug from backing out in the
unlikely event that the cap nut fails or is screwed on
incorrectly.
WARNING: Immediately check for leaks when the
boat is placed in the water. Do not leave the boat
unchecked for more than three hours. Even a small
leak may allow considerable water to accumulate.
CAUTION: Never pull, carry, or hold the transducer by
its cable; this may sever internal connections.
CAUTION: Never use a fairing with a plastic housing;
the protruding sensor would be vulnerable to damage
from impact.
CAUTION: Never install a metal housing on a vessel
with a positive ground system.
CAUTION: Never use solvents. Cleaners, fuel,
sealants, paint, and other products may contain strong
solvents, such as acetone, which attack many
plastics, greatly reducing their strength.
IMPORTANT: The sensor must be in good contact
with the water at all times.
IMPORTANT: Read the instructions completely
before proceeding with the installation. These
instructions supersede any other instructions in your
instrument manual if they differ.
10-15VDC
Record the information found on the cable tag for future reference.
Part No._________________Date___________
Applications
• Not recommended for boats designed to pull air under the hull.
• Plastic housing recommended for fiberglass or metal hull only.
Never install a plastic housing in a wood hull since swelling of
the wood may fracture the plastic.
• Bronze housing recommended for fiberglass or wood hull only.
Never install a bronze housing in a metal hull because
electrolytic corrosion will occur.
• Raymarine ST-40—The ultrasonic insert is too long for the
existing housing. Install the new housing supplied.
How the Ultrasonic Speed Sensor Works
The speed sensor uses ultrasonic pulses to collect echoes from
small particles in the water as they pass under two transducers
embedded in the insert (see Figure 1). These transducers monitor
the particles in their respective beams. As the boat travels through
the water, both transducers ‘view’ the same stream of particles.
Because it takes time for particles to travel between the two
transducers, the aft transducer detects the particles later than
does the fore transducer. By measuring this time lapse, the
instrument calculates the boat speed. If the boat is airborne, even
for a short time, or in highly aerated water, the sensor will
measure an incorrect speed.
hull
vessel direction
particle stream
scanning transducer
FORE AFT
Figure 1. Monitoring particles in the water
Copyright © 2002 Airmar Technol ogy Corp.
Tools & Materials
Safety goggles
Dust mask
Water-based anti-fouling paint (mandatory in salt water)
Electric drill with 10mm or larger chuck capacity
Drill bit 3mm or 1/8"
Hole saw 51mm or 2"
Sandpaper
Mild household detergent or weak solvent (such as alcohol)
File (installation in a metal hull)
Marine sealant (suitable for below waterline)
Additional washer [for aluminum hull less than 6 mm (1/4") thick]
Slip-joint pliers (installing a metal housing)
Grommet(s) (some installations)
Installation in a cored fiberglass hull (see page 3):
Hole saw for hull interior 60mm or 2-3/8"
Fiberglass cloth and resin
or Cylinder, wax, tape, and casting epoxy
ultrasonic
insert
housing
& valve
assembly
outside wall
below
lowest o-ring
active face
bore
of housing
up 30mm (1-1/4")
exterior flange
Figure 2. Anti-fouling paint
Copyright © 2002 - 2011 Airmar Techno logy Corp.
Mounting Location
CAUTION: Do not mount near water intake or discharge openings
or behind strakes, fittings, or hull irregularities that will disturb the
water flow.
CAUTION: Never mount the sensor directly ahead of a depth
transducer, since turbulence generated by the housing will
adversely affect the depth transducer’s performance, especially
at high speeds. Mount side-by-side.
CAUTION: Do not mount in line with trailer rollers or bunks that
may damage the sensor.
Turbulence-free water must flow under the ultrasonic sensor at all
speeds. Choose an accessible spot with a minimum of 280mm
(11") of headroom inside the vessel to allow for the height of the
housing, tightening the nuts, and removing the insert.
• Fin keel sailboats—Mount on or near the centerline and
forward of the fin keel 150– 3 00 mm (1/2 –1').
• Full keel sailboats—Locate amidships and away from the keel
at the point of minimum deadrise.
• Displacement hull powerboats—Locate amidships near the
centerline.
• Planing hull powerboat—Mount well aft to ensure the sensor
is in contact with the water at high speeds.
Anti-fouling Paint
Aquatic growth can accumulate rapidly on the ultrasonic sensor’s
surface reducing performance within weeks. Surfaces exposed to
salt water must be coated with anti-fouling paint. Use water-based
anti-fouling paint only. Never use ketone-based paint, since
ketones can attack many plastics possibly damaging the sensor.
It is easier to apply anti-fouling paint before installing the sensor,
but allow sufficient drying time. Reapply paint every 6 months or
at the beginning of each boating season. Paint the following
surfaces (see Figure 2):
• Outside wall of the ultrasonic insert below lowest o-ring
• Active face of the ultrasonic insert
• Exterior flange of housing
• Bore of housing up 30mm (1-1/4")
• Blanking plug below lower o-ring including exposed end
Installation
Hole Drilling
Cored fiberglass hull—Follow separate instructions on page 3.
1. Drill a 3mm or 1/8" pilot hole from inside the hull. If there is a rib,
strut, or other hull irregularity near the selected mounting
location, drill from the outside.
marine
sealant
P120 plastic housing
ultrasonic insert
cap nut
safety wire
hull nut
washer
hull
B120 metal housing
marine
sealant
Figure 3. Bedding and installing
Copyright © 2002 - 2011 Airmar Technol ogy Corp.
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