Cygnus FMD System for Diver

Ultrasonic Flooded Member Detection System

Used by divers to detect water ingress in subsea structural members through the use of ultrasound. This flooded member inspection system has an easy-to-use interface proving a clear DRY or FLOODED result.

Following deployment, the Cygnus FMD system runs a test using the FMD reporting software at the surface. This test shows a simple ‘DRY’ (Green) or ‘FLOODED’ (Red) result, with A-scans for further verification. The results are then logged for analysis or reporting as a PDF and Excel file.

  • Easy to Use: Responsive probe handling solution that self-aligns with the surface, ensuring that correct contact with the member has been made, regardless of the angle or direction of approach. Then a simple ‘DRY’ or ‘FLOODED’ result is displayed and logged on the reporting software at the surface.
  • Cost Effective: The clever and failsafe design makes this system easy to learn and can be used by owners and operators with varying experience so that there is no need for expensive external contractors.
  • Rugged: Designed to the highest standards and supplied with a 3-year warranty.
  • Reliable: The purpose-designed algorithm simultaneously uses: advanced signal processing; an advanced peak detection algorithm and; low distortion / low noise data acquisition to ensure highest level of PoD (Probability of Detection) to eliminate false readings. This failsafe design also means measurements are only taken when the contact sensor detects correct probe contact and alignment. Any loss of contact is shown on the reporting software at surface. There is also a ’System Test’ function that allows users to carry out tests prior to deployment
  • Versatile: The compact design of the probe solution means tests can be done on hard-to-reach areas such as K nodes, where other inspection methods are unable to perform.
Probe0.5 MHz high power piezo composite probe – single element
Measuring Range200 – 2000 mm member diameter
Resolution1 mm


Diver Communications PSU110-240 AC 50/60 Hz @ 1A (max)
ROV Power Supply12 to 24 volt D.C @ 60mA


DigitalRS232 & RS485
Baud Rate115,200
Date CaptureOn demand 3 shot and varying gain levels
Diver Data LinkRS485 half – duplex
ROV Date LinkRS232 full – duplex suitable for fibre multiplexers


Acetal Electronics Body0.9 kg
95 x 115 mm
Stainless Steel Electronics Body4 kg
95 x 115 mm
Acetal Probe Handler2.5 kg
140 x 170 x 130 mm
Stainless Steel Probe Handler4.7 kg
140 x 170 x 130 mm
120m Umbilical Cable23 kg
340 x 450 x 555 mm
350m Umbilical Cable87 kg
450 x 600 x 930 mm
50m Deck Cable13 kg
290 x 380 x 490 mm
Depth Rating300 msw
Operation Temperature0°C to +75°C
Storage Temperature-40°C to 55°C
Cable Protector
– Provides extra cable protection and an attachment point for divers
Self Aligning Probe Handler
– Tough Stainless Steel or
– Lightweight Acetal
Handle Option
– Stainless Steel D-Handle
Communications PSU
– Provides power and communications to the diver
Umbilical Cable
– 120m length
– 350m length
System Test Tank
– Used to run a full system test of the FMD system

1 review for Cygnus FMD System for Diver

Avatar Of Louis P

Louis P

Nov 25, 2020 11:27 AM

The new Cygnus Ultrasonic FMD System was perfect for our recent application. Our technicians found the software to be very easy to use with features that ensured a quick and reliable result. It’s a great addition to the Westerton Access capability, offering FMD inspection from the Falcon ROV

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