Checking The Transducer - NorthStar 490 Echosounder Operation Manual

Chapter 8 - Troubleshooting 490 Operations

Checking the transducer

Maintaining a
transducer
Page 8-4
To provide the best possible performance with the 490 echo
sounder, Northstar recommends the use of an Airmar
transducer.
Table 3: Northstar-recommended transducers
Manufacturer
Airmar
Airmar
Airmar Technology Corporation may be reached at 35
Meadowbrook Drive, Milford, New Hampshire 03055-4613;
phone 603/673-9570; fax 603/673-4624.
GEM Electronics Co., a supplier of transducers, can be reached
at 843/394-3565.
Detailed information on maintaining and troubleshooting a trans-
ducer is outside the scope of this manual. Refer to the transducer
manufacturer's documentation. Do not return a transducer to North-
star. If you need to return a transducer for service, contact the man-
ufacturer directly for instructions.
Do not expose a transducer to gasoline or clean it with strong
solvents. These can penetrate and degrade the housing. If a
transducer will be exposed to saltwater, coat it with
anti-fouling paint to prevent sea growth. To clean a transducer
of sand, debris, or sea growth, use a stiff brush or putty knife.
Use sanding sparingly, as repeated sanding may affect a
transducer's performance at high speeds. If necessary, wet
sand with finer grade wet or dry paper. Check the transducer
periodically.
Model
41-088-1-01
B744V
(w/3-wire speed)
NOTE:
490 Echo Sounder Operations Manual Rev. B2
Frequency
1 kW
600 W