Impact Subsea has released a new podcast episode as part of the Impact Subsea Academy series, examining the design, performance and subsea applications of the ISA200 and ISA500 altimeters. Find out more >>
Hosts Alana and Alan introduce how these sonar-based sensors achieve precise distance measurements. The ISA200 provides a nominal range of 250 meters, while the ISA500 is rated to 120 meters but can extend beyond 175 meters on hard reflective targets or shorten in softer conditions such as sediment or marine growth.
The discussion explores how advanced digital correlation techniques allow both devices to achieve 1 millimeter accuracy and repeatability. A built-in correlation factor acts as a confidence score, ensuring only reliable echoes are reported.
Operational flexibility is a central theme. The ISA500 includes an adjustable operating frequency to avoid interference, while both models can be configured through seaView software. Optional features include an echogram function for single-beam imaging and an integrated AHRS, which corrects for vehicle pitch and roll to provide true altitude measurements.
The podcast also highlights the engineering of both instruments, including construction from titanium or acetal, a depth rating of up to 11,000 meters for the ISA500, and rigorous testing to API 17F standards for shock and vibration.
By combining range, millimeter precision, adaptability and robust design, the ISA200 and ISA500 support demanding subsea tasks such as pipeline survey and vehicle navigation.
