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Impact Subsea ISA500 Range of Altimeters

Underwater Altimeter & Echo Sounder with optional integrated Pitch, Roll & Heading (AHRS)

The ISA500 family of underwater Altimeters provide range measurement capability to the nearest 1mm with a range of over 120 meters.

  • Impact Subsea ISA500 Range of Altimeters
Impact Subsea
Unit 10 & 11, Castle Street, Castle Road Industrial Estate
AB41 9RF Ellon
United Kingdom
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The ISA500 underwater Altimeter & Echo Sounder provides exceptionally long distance measurement capability – in excess of 120 meters.  In addition to providing exceptionally long range capability, the unit has a 1mm accuracy – allowing precision underwater distance measurements to be made.

Optionally, the ISA500 can also be provided with an integrated Attitude and Heading Reference System (AHRS).  This provides highly stable Heading, Pitch and Roll readings.

Altitude & Echo Sounding

The ISA500 utilises sonar technology to derive distance measurement.

Operating by default at 500kHz, the unit utilises a broadband composite transducer and electronics together with an advanced digital acoustic engine.  The combination of these enable the unit to achieve long range and high accuracy.

The unit can be operated at any frequency from 400 to 600kHz – ideal for different applications or operating in conjunction with other hydro-acoustic or sonar equipment.

With first return, strongest return and seabed tracking modes, the ISA500 can be configured to suit specific applications. 

Attitude & Heading Reference System (AHRS)

Optionally available on the ISA500 is an integrated Attitude & Heading Reference System (AHRS) providing Heading, Pitch & Roll.

The AHRS is based on Micro-Electrical-Mechanical-System (MEMS) based technology.

Within the ISA500 there are three MEMS based Gyros, Accelerometers & Magnetometers.  The outputs from each of these MEMS devices are fused together, providing highly stable Heading, Pitch & Roll.

The Heading is highly resilient against temporary magnetic interferes.  This is aided by a soft and hard iron calibration feature once the unit has been installed on the ROV, AUV or other underwater application.


An ISA500 For Every Application

The ISA500 is available in a range of housing configurations and materials.

The unit can be provided in 1000, 6000 & 11,000 meter rated housings and is available in either Titanium or Acetal.

Both forward looking and right angle housing configurations are available – enabling simple integration into any underwater vehicle, structure or device.

The ISA500-OEM is also available, which offers an un-housed version of the ISA500 for integration into a third party housing or system.



  • Year of initial development
  • Year of latest version
  • Area of Application
    Subsea ROV & AUV
  • Field of Use
    Accurate & Long Range Distance Measurement
  • Languages Supported
  • Power Supply [V]
    9 to 36VDC
  • Operating current
    30mA @ 24VDC, 51mA @ 24VDC (Max Ping Rate & Power)
  • Output interface
    RS232 & RS485
  • Analog output
    Software Configurable Current or Voltage Output
  • Weight in air [kg]
  • Weight in water [kg]
  • Width [m]
  • Length [m]
  • Min. operation temperature [°C}
  • Housing material
    Titanium or Acetal
  • Max. operation temperature [°C}
  • Min. Operating frequency [kHz]
  • Chirp
  • Beamwidth {deg}
    6 Degree Conical
  • Max. acoustic accuracy
    0.75 millimetre
  • Digital resolution
    1 millimetre
  • Analog resolution
    12 bit
  • Min. acoustic accuracy
    0.75 millimetre
  • Max. Operating frequency [kHz]
  • Minimum range {m}
  • Maximum range {m}
  • Depth rating {m}
  • Output data format
    Various ASCII Outputs - Configurable
  • Sampling rate (fixed or adjustable)
    10 Hz (Adjustable)
  • Data flow
    Continous, Triggered, Both
  • Slant range correction
  • Data storage
  • Stand alone mode
  • Sound velocity input
  • Pressure sensor
  • Right angled type
  • Additional capabilities
    Also provides Heading, Pitch, Roll & Temperature. Available in various housing materials and mechanical configurations.
  • Distinguishable features
    - Integrated Heading, Pitch & Roll (Optional)- 120+ meter range- 1 millimetre resolution - stable & repeatable - All settings are software configurable (Range, Frequency, Slant Range Correction, Output String, Communications, etc)- Can be paired with the ISD4000 to provide Survey Grade Depth & Temperature- Supplied with seaView software suite - Can be used for Hydrographic Surveys with the seaView Hydro Survey app- Can be used for Flooded Member Detection (FMD) with the seaView FMD app

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