Underwater Depth & Temperature Sensor

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Introducing the ISD4000

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The ISD4000 is a compact, survey grade Depth & Temperature Sensor.

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




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A temperature compensated piezo-resistive pressure sensor is used to determine Depth to 0.01% Full Scale accuracy and optionally to ± 0.005% FS.

Available in a variety of pressure ranges (10, 30, 50, 100, 300, 400 & 600 Bar) ensures that the highest level of accuracy can be achieved for any depth of application.

Depth can be provided at any rate up to 100 Hz – ideal for precision control and monitoring applications.


A Resistance Temperature Detector (RTD) probe provides temperature to 0.1 degrees C accuracy (optionally available to 0.05 degrees C accuracy).

The RTD is located directly inside the temperature probe, placing it exceptionally close to the water. This enables a very high accuracy temperature reading to be obtained, with exceptionally low latency.


Optionally available on the ISD4000 is an integrated Attitude & Heading Reference System (AHRS) providing Heading, Pitch & Roll.

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

Within the ISD4000 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 system.



Provides Depth readings to 0.01%FS and optionally to ± 0.005% FS. Ideal for survey operations.

The high update rate (up to 100Hz) is highly applicable for use with auto depth systems.

Temperature is provided along with Heading, Pitch & Roll – ideal for basic navigation.

Monitor the depth during deployment together with the Pitch, Roll and Heading of the equipment. Provides a clear understanding of equipment position and attitude.

Using multiple ISD4000 units, monitor the deflection of a subsea structure.  The optional 0.005%FS pressure accuracy is ideal for this application. 

Depth & Temperature are provided to survey grade – ideal for any survey.

The integrated gyros, accelerometers & magnetometers provide highly stable Pitch, Roll & Heading in addition to Depth & Temperature.

ISD4000 Options - With AHRS

Use this flowchart to find the ideal configuration of ISD4000 with AHRS for your application

ISD4000 Options - Without AHRS

Use this flowchart to find the ideal configuration of ISD4000 without AHRS for your application

The Impact Subsea Academy is a help center and knowledge base. It has been set up for you to be able to search for articles on anything from your first steps to the most advanced features.


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