Cygnus Mini ROV Mountable

Ultrasonic Thickness Meter

The Cygnus Mini ROV unit is designed to be mounted onto small (“observation”) ROVs both with and without a manipulator capability. When mounted, this subsea thickness meter allows the operator to carry out an ultrasonic thickness measurement in areas that have previously been unfeasible using larger ROVs or divers - and there is still no need to remove protective coatings!

Key Features of the Cygnus Mini ROV Mountable

  • Uses multiple-Echo mode for accurate, through-coat measurements (as specified by Classification Societies)
  • Supplied with CygLink software to display and process measurements at the surface
  • Simple calibration (at the surface) via CygLink software or Topside Repeater (TSR) unit
  • Optional Topside Repeater (TSR) unit allows readings to be superimposed onto ROV’s camera screen and / or displayed remotely
  • Purpose-built ROV probe handlers for optimal alignment (optional)
  • Cygnus-Pioneered Multiple Echo Technique – original and best
  • Measures remaining metal thickness on corroded and coated structures
  • Measurements are error checked using 3 return echoes to give repeatable, reliable results
  • Greatly reduces inspection time and costs
  • Echo strength indicator to aid measurement.
  • Accepted by all major classification societies

CygLink Computer Software

CygLink is a Windows® based application used to both transfer and manage data logged records, their corresponding A-scans as well as measurement comments and material velocity tables. Cyglink can generate PDF reports to present to the client and will also export data to Excel. Cyglink also displays A‑scans, allowing for off-site analysis of logged measurements at a later date.

The latest version of CygLink software is available to download – from ‘Software Downloads’.

Cygnus Mini ROV used on Blueye X3


Cygnus Mini ROV used on DeepTrekker DTG3

MaterialsVelocities between 0.0400 and 0.3998 in/microsec (1,000 and 9,995 m/s)
Measurement Range in Steel0.040 – 10 inch (1 – 250 mm) depending on selected probe and configuration, material and temperature
Accuracy±0.004 inch (±0.1 mm) or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Resolution0.005 or 0.002 inch (selectable) (0.1 or 0.05 mm)
Probe OptionsSingle crystal transducers
Power7.5 – 30 V DC @ 150 mA (max)
DisplayPC or laptop with VGA (not included)
Size6.3 x 2.4 inch (160 x 62 mm)
Weight in Air19.4 oz (550 g)
Operating Temp.14°F to 122°F (-10°C to +50°C)
ApprovalsRINA Type approved
TestingTested to 1,640 ft (500 m) depth
CommunicationRS-422, Simplex Single Pair or 2400 Baud (RS-232 9600 Baud output available as special order)
StandardsDesigned for EN 15317
ComplianceCE, UKCA, RoHS
Warranty3 years on meter and 6 months on transducer
  • Cygnus Mini ROV gage body
  • Nose cone torque bar
  • Operation manual and 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.
Weight5 kg

Cygnus Mini ROV Mountable Gauge Standard Kit with 2.25MHz 13mm Standard Probe, Cygnus Mini ROV Mountable Gauge Standard Kit WITHOUT PROBE

Engineered Probe Handling Solutions

Complementing the Cygnus Mini ROV Mountable thickness meter, the Cygnus G1 is designed for use on observation, inspection and light work-class ROVs whilst the S1 probe handler is developed for use on ROVs performing UTM surveys on ship hulls.

Topside Repeater Remote Display Unit

The Cygnus Topside Repeater is a remote display unit connected to the gage with an umbilical cable. It displays the thickness measurements at the surface in real-time during the survey.

Topside Repeater with Video Overlay

The Topside Repeater can also overlay the real-time thickness measurements on to a composite video signal, displaying it on the survey monitor screen. It will also then be recorded (if there is a video of the survey), showing exact locations and the thickness measurement for future reference.


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