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Impact Subsea



The ISA500 altimeter is a highly robust instrument with an integrated attitude and heading reference system (AHRS) to compensate for vehicle motion. The ISA500 utilizes a broadband composite transducer with an advanced digital acoustic engine to provide the highest level of stability and range capabilities out of any 500 kHz altimeter. The instrument is depth rated down to 6,000-meters and communicates over Serial RS232 or RS485.

Our standard configuration comes with an underwater titanium altimeter, 0.5-meter interface whip, spare locking clip and o-rings, USB drive with SeaView configuration software and user manual, quick start guide, and transit case.

ISA500 Altimeter


Frequency:                           500kHz Center                                                                                                                        400 to 600Hz  Bandwidth

Altitude Range:                   0.1 to 120 meters

Resolution:                           1 mm 

Depth Rating:                       6000 meters                                                                   

Impact Subsea

ISD 4000

Depth & Temperature


A temperature compensated piezo-resistive pressure sensor is used to determine Depth to 0.01% Full Scale accuracy.

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 0.01 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.

Attitude & Heading Reference System (AHARS)

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.

ISD4000 Depth & Temperature Sensor


Pressure:                               Optional: 10, 30, 50, 100, 300, 400 & 600 Bar

Data Rate:                             up to 100 Hz

Temp Accuracy:                   0.01 degrees C 

Depth Rating:                       6000 meters                                                                   

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