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SECTION TWO — Installing the transducer
PAGE 4 491 INSTALLATION MANUAL Revision A
Selecting a
transducer
Northstar recommends using an Airmar transducer with the Northstar
491 echo sounder. The Airmar B260, B744 and P66 can be obtained from
Northstar as an installation kit with connectors installed.
A table of Airmar transducer elements is given below to assist in evaluat-
ing characteristics of other Airmar transducers.
Dealers can also purchase quantities of transducers directly from Airmar
Technology Corporation at:
Airmar Technology Corporation
35 Meadowbrook Drive
Milford, New Hampshire 03055-4613
Phone 603/673-9570
Fax 603/673-4624
(www.airmar.com)
Table 1: Northstar-recommended transducers
Manufacturer Housing Power Frequency Northstar P/N
Airmar B260 1 kW 50/200 kHz TD1004
Airmar B744V/B44V (with
3-wire speed)
600 W 50/200 kHz TD1005
Airmar P66 600 W 50/200 kHz TD1006
Table 2: Airmar transducer elements
Transducer
element
Single
or Dual
element
Used in
Airmar
P/N
Acoustic
material
Beam
Width
(50
kHz)
Beam
Width
(200 kHz)
Rated
Power
50/200A Single B744V
B744VL
P319
B117
SS555
Urethane 45° 12° 600W
50/200A Single P66
P79
P74
LPU 45° 11° 600W
50/200B Single B256 Urethane 23° 5° 1200W
50AE/200Riq Dual B45
B250-B
B260
Urethane 19° 6° 1000W