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ECHO SOUNDER TRANSDUCERS
Single Beam:
  Frequency Model
  12 kHz T 198
  24, 28, 30, 33, 38, 50 kHz 395 Series
  160, 200, 210, 300, 600 kHz 390 Series
  24, 28, 30, 33, 38, 50 kHz 147 Series
  24, 28, 30, 33, 38, 50 kHz 172 Series
  160, 200, 210, 300, 600 kHz 142 Series
  24, 28, 30, 33, 38, 50 kHz 320 Series
Dual Beam:
  Frequency Model
  24, 28, 30, 33, 38 kHz 153 Series
  12 kHz T 119
  120 kHz T 38
  200 kHz T 37
  210 kHz T 28
Dual Frequency:
  Frequency Model
  33 & 210 kHz T 141
  24, 28, 30, 33, 38, 50 kHz
160, 200, 210, 300, 600 kHz		 76 Series
  24, 28, 30, 33, 38 kHz
160, 200, 210, 300, 600 kHz		 77 Series
  24, 28, 30, 33, 38 kHz
160, 200, 210, 300, 600 kHz		 340 Series

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:: TRANSDUCER PRODUCTS / Dual Beam Transducers MODEL T37
200 OR 210 KHZ DUAL BEAM
 NAVIGATION : FISHING : SURVEYING
 HIGH PERFORMANCE
 SCIENTIFIC ECHO SOUNDING
 HULL OR TOWED BODY
 ROBUST NYLON HOUSING
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The T28 and T37 are precision echo sounder transducers designed for use in hydrographic or scientific applications where accurately defined beam patterns are needed.

The T28 operating at 210 kHz and the T37 at 200 kHz have identical element patterns configured to achieve narrow and wide conical beams.

A four core screened cable moulded into the rear of the array enables the beams to be switched between wide and narrow patterns using a bridge located selection box.

Originally designed for hull mounting, the tough nylon body is pressure rated down to 250 metres making it suitable for towed body installation.

Single beam versions of both transducers have recently been introduced. These provide the same performance as the narrow beam configuration but with lower side lobe levels.
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Technical Specification
Neptune Sonar T28 T37 Type Number
Resonant Frequency 210 200 kHz
Beam Wide Narrow Wide Narrow Selectable
Horizontal Beam @ -3dB 5.7 2.9 6.0 3.1 Degrees
Transmit Sensitivity 178 183 177 182 dB re uPa/V @ 1m
Receive Sensitivity -187 -183 -187 -183 dB re V/uPa
Input Power 1600 3000 1600 3000 Watts
Bandwidth 10 10 10 10 kHz
Nominal Impedance 50 50 50 50 Ohms
Transducer impedance can be adjusted to suit customers specification
Standard Depth Rating 250 Metres
Cable Length 10 metres standard
(Additional lengths supplied to order)
Cable Type Polyurethane Ø12mm 4 Core Screened
Storage Temperature -40 to +80°C
Operating Temperature -5 to +70°C
Ordering Information
T28, cable length 
T37, cable length 
 
   
       
       
   

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