Airmar TRIDUCER UDST800 Owner's Manual And Installation Instructions

OWNER'S GUIDE
Thru-Hull, Retractable with Valve
Ultrasonic TRIDUCER
Model UDST800
Follow the precautions below for optimal
product performance and to reduce the risk of
property damage, personal injury, and/or death.
WARNING: Always wear safety glasses, a dust mask,
and ear protection when installing.
WARNING: The valve is not a watertight seal!
Always install the ultrasonic insert or blanking plug. Be sure
it is fully inserted into the housing and the cap nut is screwed
on completely for a watertight seal.
WARNING: The ultrasonic insert/blanking plug must
be installed in a housing with a valve.
WARNING: The YELLOW O-ring must be in place
near the top of the insert to make a watertight seal.
WARNING: To retrofit the insert in a housing without
a valve, the insert must have a BLACK O-ring near the
top to make a watertight seal.
WARNING: The O-rings must be intact and well
lubricated to make a watertight seal.
WARNING: Stainless steel housing in a metal hull—
Be sure the washer contacts the hull. Do not tighten
the hull nut with the washer against the isolation
bushing, as the housing will not be firmly installed.
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: Plastic housing—Never use a fairing with
a plastic housing; the protruding multisensor would be
vulnerable to damage from impact.
CAUTION: Stainless steel housing in a metal hull—
Stainless steel housing must be isolated from a metal
hull to prevent electrolytic corrosion. Use the isolation
bushing supplied.
CAUTION: Metal housing—Never install a metal
housing in a vessel with a positive ground system.
CAUTION: Never pull, carry, or hold the transducer by
its cable; this may sever internal connections.
&
Multisensor
®
Smart Sensor
™
INSTALLATION INSTRUCTIONS
Record the information found on the cable tag for future reference.
Part No._________________Date___________Frequency________kHz
U.S. Patent No.: 6,426,918; 6,671,225; 6,678,208; 9,513,373; 9,594,165
EP Patent No.: 1 634 087
CAUTION: The arrow on the top of the ultrasonic
insert must point forward toward the bow to align with
the water flow.
CAUTION: Never use solvents. Cleaner, fuel, sealant,
paint, and other products may contain solvents that can
damage plastic parts, especially the transducer's face.
IMPORTANT: Read the instructions completely
before proceeding with the installation. These
instructions supersede any other instructions in your
instrument manual if they differ.
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 (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.
scanning transducer
hull
vessel direction
particle stream
Figure 1. Monitoring particles in the water
Copyright © 2002 Airmar Technology Corp.
UDST800
plastic
low profile
P617V housing
FORE AFT