837B Delta T 120 kHz Profiling

The Imagenex Model 837B “Delta T” 120 kHz is a high resolution multiple receiver sonar system run from a laptop or industrial PC computer.  In this model, the acoustic array is designed to provide detection over a 120° x 2.5° field of view for bottom profiling applications.  The 2.5° field of view is also applicable to obstacle avoidance in near-bottom applications where the narrow vertical extent of the beam reduces false obstacle detection.  A 120 kHz acoustic frequency has been selected to provide detection up to 300 m range.  Image update rates are up to 20 times per second at short range and more than 5 times per second at 100 m range.  The stainless steel housing provides a 1000 m depth rating for compatibility with ROV and AUV applications.

The provided software includes innovative digital signal processing to optimize data usage from all channels to achieve the best possible resolution at every point in the field of view.  Recent advances in PC computing power have made it possible to transfer this data over a standard 10 BASE-T Ethernet connection and process it at resolutions equal to computer monitor resolution.  Software is also available to store the data with a low power computer for processing into extremely high resolution images after uploading to a desktop PC.

The Delta T system has been designed from the ground up with the most advanced low power electronic components available to provide breakthroughs in system power consumption and package size.  There is no expensive and bulky surface control box, so integration into ROV and AUV systems is simplified, and the cost is significantly less than other systems of similar capabilities.

Imagenex sonars:  advancing underwater imaging capability for the everyday user.

837B Delta T 120 kHz Profiling

Underwater Hardware Specifications


120 kHz

Transducer Beam Width

Receive:  120° (horizontal) x 2.5° (vertical)
Transmit:  120° (horizontal) x 2.5° (vertical) 

Effective Beam Widths

3°, 1.5°, 0.75° 


120, 240, 480

*Data is acquired at full resolution every shot:  processing the data for screen display on a PC can slow the system at highest number of beams.  120 beam mode is recommended for real time data acquisition.  The data can then be played back at highest resolution (480 beam).

Range Resolution

Screen: 0.2% of range
Output: 0.02% of range

Min. Detectable Range

0.5 m

Max. Operating Depth

1000 m 

Interface to PC

Standard:  10 Mbps Ethernet (10 BASE-T) using TCP/IP

Bit rate may vary if an Ethernet extender is in use. 

Max. Cable Length

Standard:  100 m on CAT5e

Cable length may be increased up to ~9000 m using an Ethernet extender. Please enquire for more information. 


End mounted, 8 conductor, wet mateable
(Subconn MCBH8M-SS or MCBH8M-AS)

Power Supply

22 – 32 VDC at less than 5 Watts


See Drawing

Weight in Air

Stainless Steel:  ~21 kg (~46 lbs)
Aluminum:  ~11.4 kg (~25 lbs)

Weight in Water

Stainless Steel:  TBA
Aluminum:  ~6.8 kg (~15 lbs)


Stainless Steel:  316 Stainless Steel, Epoxy, PVC, Stainless Steel connector
Aluminum:  6061-T6 Aluminum, Epoxy, PVC, Aluminum connector

Software Specifications


Windows™ Operating System

Windows™ XP, Vista, 7, 8, 10

Display Modes

Sector, Linear, Perspective, Profile, Beam Test 

Persistence (Trail)

1 – 300 seconds 

Range Scales

5 m, 10 m, 20 m, 30 m, 40 m, 50 m, 60 m, 80 m, 100 m, 150 m, 200 m, 250 m, 300 m

Sector Sizes

30°, 60°, 90°, 120° 

File Format

Raw Data:  (filename).837
Profile Point:  (filename).83P

Recommended Minimum Computer Requirements

2 GHz Pentium 4
256 MB RAM
20 GB Hard Disk
1024 x 768 screen resolution 

Ordering Information

1000 m Unit in Stainless Steel


1000 m Unit in Aluminum


IP Address*

Option               -020

*Note:   Standard IP Address is
            A different IP Address may be specified upon ordering.

External Trigger

Option               -023

Pitch, Roll, & Heading Sensor

Option               -029

837B Delta T 120 kHz Profiling


  • Programmable
  • High speed
  • High performance
  • Lower cost
  • Low power
  • Simple set-up and installation
  • Ethernet
  • 5 m to 300 m range scales
  • Integrated Video Capture and Display
  • Built in GPS Track Plotter


  • ROV, AUV, & UUV
  • Offshore Oil & Gas
  • Sunken Timber Recovery
  • Diving Support
  • Surveying
  • Search & Recovery
  • Inspection
  • Underwater Archaeology
  • Scientific Research

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