Cygnus Mini ROV Mountable

Multiple Echo Ultrasonic Thickness Gage

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The Cygnus Mini ROV Mountable thickness gauge has been specially designed to be mounted onto small observation ROVs with or without a manipulator facility. Built in conjunction with VideoRay, this mountable subsea thickness gauge will allow the operator to carry out an ultrasonic thickness measurement in areas that have previously been unfeasible using larger ROVs or divers. The multiple echo thickness gauge measures metal thickness and corrosion without removing protective coatings.

Dedicated software displays the time, date and thickness readings on the surface which can all be stored or logged. Alternatively, an optional Topside Repeater (TSR) is available which has the facility to display the thickness measurements remotely and overlay them on to a video signal. This allows the measurements to be superimposed on the ROV camera’s monitor screen.

The unit is pressure tested to 1,640 ft (500 m).

Please see examples of ROV ultrasonic thickness gauges using the Cygnus Mini ROV thickness gauge:

VideoRay ROV Ultrasonic Metal Thickness Gauge

AC-ROV Thickness Gauge

Deep Trekker DTG2 ROV thickness gauge

Cygnus Instruments builds all of its equipment in the UK using only genuine and original parts and components – including Lemo® Connectors and Peli® Cases.


  • Designed specifically to mount onto small observation ROV’s.
  • Supplied with *CygLink software to display and log thickness measurements from the ROV on a computer at the surface which can be saved to a file and printed out.
  • CygLink has two data logging facilities: Quick Log for simple recording of thickness measurements and structured mode with four templates available – Single Point, Multi Point, Grid Point and Key Point.
  • Easy calibration at the surface via CygLink software or Top Side Repeater (TSR) unit.
  • Optional dedicated probe holder to allow measurements on curved or flat surfaces.
  • Only one twisted pair is required to transfer the data to the surface.

*For more details, visit the CygLink Software page in PRODUCTS > THICKNESS GAUGING ACCESSORIES section.

Materials Sound velocities between 1000 m/s and 9995 m/s
Measurement Range in Steel 0.110″ – 9.995″ (3 mm – 250 mm) with 2.25 MHz probe
0.065″ – 6.000″ (2 mm – 150 mm) with 3.5 MHz probe
0.045″ – 4.000″ (1 mm – 50 mm) with 5.0 MHz probe
Accuracy 0.005″ (0.1 mm) when calibrated in accordance with Cygnus Instruments calibration procedures
Resolution 0.002″ (0.05 mm)
Power 7.0 – 30 V dc @ 150 mA (max)
Display PC or Laptop with VGA (not included)
Size 6.299″ x 2.441″ (160 mm x 62 mm)
Weight 19.4 oz (550 g)
Operating Temp 14°F to 122°F (-10°C to +50°C)
Approvals RINA Type Approved
Testing Tested to 1,640 ft (500 m) depth
Communications RS-422, Simplex Single Pair, 2400 Baud
Standards Designed for EN 15317
Environmental RoHS, WEEE compliant
  • Cygnus MINI ROV Gauge Body
  • Nose Cone Torque Bar
  • Operation Manual & CygLink Software on USB Flash Drive
  • Bottle of Membrane Couplant
  • Carry Case
  • Test Lead
  • 9 Way D-Type Connector
  • Impulse Plug to Fly Leads
  • Impulse Blanking Plug
  • 10 x ‘B/D’ O Rings
  • 10 x ‘A’ O Rings
  • Silicone Grease
  • K3 RS-422/485 to RS-232 Converter
  • RS-232 to USB Converter
  • K3 Manual, Documents and Warranty Letter
  • Probe Assembly, including: Spare Membranes and Membrane Key; Sample Test Block.
Single Crystal Soft-Faced Compression 13 mm – 2.25, 3.5 or 5 MHz



The Cygnus Topside Repeater (TSR) is available as an option and has the facility to display the thickness measurements remotely and overlay them on to a video signal. This allows the measurements to be superimposed on the ROV camera’s monitor screen.



Cygnus G1 Observation, Inspection, Light Work Class ROV Probe Handler:  The Cygnus G1 Probe Handler is designed for use on Observation, Inspection and Light-work class ROVs. Constructed from acetal it is both strong and lightweight it features an adjustable mounting bracket allowing optimum positioning of the UT probe. The UT probe is located in an articulated mount that allows up to 15 degrees of movement in both planes allowing automatic alignment of the probe face to the measurement surface making the ROV pilot’s job easier.

Cygnus S1 Probe Handler for ROV Ship Hull Inspection:  Complementing the Cygnus range of ROV Mountable thickness gauges, the Cygnus S1 Probe Handler is developed for use on Inspection and Medium sized ROVs carrying out ship hull inspections.

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