17-263-01 rev. 01 11/02
Ultrasonic Speed Sensor
with Valve and Temperature
Model CS4500-610
U.S. Patents 5,186,050; 6,426,918
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.
The ultrasonic speed sensor requires particles in the water to
obtain echoes. If the boat is airborne even for a short time or in
highly aerated water, the sensor will measure an incorrect speed.
IMPORTANT: The ultrasonic speed sensor must be in good contact
with the water at all times for the sensor to function properly.
CAUTION: NEVER USE SOLVENTS!
Cleaners, fuel, paint, sealants, and other products may contain
strong solvents, such as acetone, which can attack many plastics
greatly reducing their strength.
Applications
• Not recommended for boats designed to pull air under the hull.
•Plastic housing recommended for fiberglass or metal hulls only.
Never install a plastic sensor in a wood hull since swelling of the
wood may overstress the plastic causing a fracture.
•Bronze housing recommended for fiberglass or wood hulls only.
Neverinstall a bronze housing in a metal hull because electrolytic
corrosion will occur.
•Never install a metalhousing in a vessel with a positive ground
system.
• Ultrasonic insert must be installed in a housing with a valve.
Raymarine ST-40—The ultrasonic insert is too long for the
existing housing. Install the new housing.
Tools and Materials
Water-based antifouling paint (mandatory in salt water)
Safety goggles
Dust mask
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
Additional washer [for aluminum hull less than 6mm (1/4") thick]
Slip-joint pliers (installing a metal housing)
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
scanning transducer
FORE AFT
hull
vessel direction
particle stream
Figure 1. Monitoring particles in the water
OWNER’S GUIDE & INSTALLATION INSTRUCTIONSIMPORTANT: Please read these instructions
completely before proceeding with the installation.
These instructions supersede any other instructions in
your instrument manual if they differ.
Record the information found on the cable tag for future reference.
Part No._________________Date___________Frequency________kHz
69920-1 Ver 1.0 01-08