837AXi 165 kHz 6000 m 120° x 10°


The Imagenex Model 837AXi “Delta T” is a multiple receiver sonar system designed to provide high-speed imaging with all the advantages of underwater sonar.  Innovative digital signal processing is used to optimize data usage from all channels to achieve the best possible resolution at every point in the field of view.  Recent advances in computing power have made it possible to transfer and process this data at resolutions equal to computer monitor resolution, and with image frame rates of better than 20 frames per second!

The Delta T system has been designed from the ground up with the most advanced, high accuracy, low power electronic components available to provide breakthroughs in system power consumption, package size, and price.  This advanced electronics package has built in flexibility and programmability to accommodate a wide range of transducer arrays.  Thus, the Delta T is the first in a family of new technology products which will have imaging and profiling capabilities to suit your underwater application.  Imagenex sonars:  advancing underwater imaging capability for the everyday user.

837AXi 165 kHz 6000 m 120° x 10°

Underwater Hardware Specifications


165 kHz

Transducer Beam Width

Receive: 120° x 10°
Transmit: 120° x 10° 

Effective Horiz. Beam Width

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

6000 m 

Frame Rate

Up to 20 fps

Interface to PC

Ethernet (100 Mbps) using TCP/IP

Max. Cable Length

100 m (328’) on CAT5-e, longer cable runs possible with additional hardware


Side mounted right angle, 8 conductor, wet mateable (Subconn MCBH8M-Ti)

Power Supply

22 – 50 VDC at less than 10 Watts


See drawing

Weight in Air

~12.1 lbs (5.5 kg)

Weight in Water

~6.7 lbs (3.1 kg)


6AL4V Titanium, Epoxy, PVC, Titanium 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).IGX
Profile Point: (filename).83P
Beam Data: (filename).83B

Recommended Minimum Computer Requirements

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

Ordering Information

6000 m Unit


Straight Connector

Option               -009

IP Address*

Option               -020

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

675 kHz

Option               -022

External Trigger

Option               -023 (Included)

837AXi 165 kHz 6000 m 120° x 10°


  • Reprogrammable IP address
  • 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
  • Harbour Surveillance

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