2
Operation
Apply power to the Ultrasonic Processor.
UST800, UST850: Status Lights
• Yellow
Initializing and testing
• Green
Pass
• Red
Fail
Troubleshooting
No Readings
• Is the ultrasonic insert installed in the housing and connected to
the Ultrasonic Processor?
• Is power being supplied to the Ultrasonic Processor? The
power must be within the correct voltage range. At a voltage
lower than 9VDC, performance is degraded and the unit will
shut down.
• Is the ultrasonic insert oriented with the arrow on the top
pointing forward toward the bow? If the insert cannot be seated
in the housing with the arrow pointing forward, check that the
arrow on the flange of the housing is pointing forward. If this is
not the case, the housing needs to be reinstalled with the
proper orientation.
Inaccurate Speed Readings
• If the ultrasonic speed sensor is ‘ON’ when the boat is
stationary, you may see a speed readout of a fraction of a knot
because of water movement under the hull.
• If the speed reading is consistently the same percentage higher
or lower than the true speed, the speed function within the
instrument needs to be re-calibrated. Follow the instructions in
your instrument owner’s manual.
Inaccurate Depth Readings or
Inaccurate Speed Readings Above 10knots
• The sensor is installed in turbulent water. The cause may be
water intake or discharge openings, strakes, fittings, hull
irregularities upstream of the sensor, or the shape of the hull in
that area. The sensor must be reinstalled in another location.
• The ultrasonic insert is covered with aquatic growth. Clean the
active face of the sensor with a dull putty knife, being careful to
avoid scratching the surface (Figure 2). If fouling is severe, lightly
wet sand the active face with fine grade (#320) wet/dry paper.
• Aerated water is flowing under the sensor because the boat is
designed to pull air under the hull. The sensor will not work on
this type of boat.
Figure 2. NMEA 2000:
UST800
,
UST850
cables
(UST800 shown)
sensor
Copyright © 2016 - 2017 Airmar Technology Corp.
instrument
Figure 1. NMEA 0183:
UST800
,
UST850
cables
(UST800 shown)
Copyright © 2016 - 2017 Airmar Technology Corp.
DeviceNet cable
33-565-04
power
supply
screw (4)
33-565-04
modified
screw (4)
sensor
NOTE
: DeviceNet
cable, 33-565-04,
must be modified
for use as the
power cable.
NMEA 0183
accessory
cable
33-1352-01
DeviceNet cable
active face
Figure 3. NMEA 2000:
UDST800
cables
sensor
Copyright © 2017 Airmar Technology Corp.
DeviceNet cable
33-565-04
screw (4)
ultrasonic processor
ultrasonic processor
ultrasonic processor
status
light
status
light