SECTION TWO — Installing the transducer
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.
Table 1: Northstar-recommended transducers
Manufacturer | Housing | Power | Frequency | Northstar P/N |
|
|
|
|
|
Airmar | B260 | 1 kW | 50/200 kHz | TD1004 |
|
|
|
|
|
Airmar | B744V/B44V (with | 600 W | 50/200 kHz | TD1005 |
|
|
|
| |
|
|
|
|
|
Airmar | P66 | 600 W | 50/200 kHz | TD1006 |
|
|
|
|
|
A table of Airmar transducer elements is given below to assist in evaluat- ing characteristics of other Airmar transducers.
Table 2: Airmar transducer elements
Transducer | Single | Used in | Acoustic | Beam | Beam | Rated |
element | or Dual | Airmar | material | Width | Width | Power |
| element | P/N |
| (50 | (200 kHz) |
|
|
|
|
| kHz) |
|
|
|
|
|
|
|
|
|
50/200A | Single | B744V | Urethane | 45° | 12° | 600W |
|
| B744VL |
|
|
|
|
|
| P319 |
|
|
|
|
|
| B117 |
|
|
|
|
|
| SS555 |
|
|
|
|
|
|
|
|
|
|
|
50/200A | Single | P66 | LPU | 45° | 11° | 600W |
|
| P79 |
|
|
|
|
|
| P74 |
|
|
|
|
|
|
|
|
|
|
|
50/200B | Single | B256 | Urethane | 23° | 5° | 1200W |
|
|
|
|
|
|
|
50AE/200Riq | Dual | B45 | Urethane | 19° | 6° | 1000W |
|
|
|
|
|
| |
|
| B260 |
|
|
|
|
|
|
|
|
|
|
|
Dealers can also purchase quantities of transducers directly from Airmar
Technology Corporation at:
Airmar Technology Corporation
35 Meadowbrook Drive
Milford, New Hampshire
Phone
Fax
PAGE 4 | 491 INSTALLATION MANUAL Revision A |
