Cygnus Mini ROV Mountable

Ultrasonic Thickness Gauge

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

Materials Velocities between 1,000 and 9,995 m/s (0.0400 and 0.3998 in/microsec)
Measurement Range in Steel 1 – 250 mm (0.040 – 10 inch) depending on selected probe and configuration, material and temperature
Accuracy ±0.1 mm (±0.004 inch) or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Resolution 0.1 or 0.05 mm (selectable) (0.005 or 0.002 inch)
Probe Options Single crystal probes
Power 7.5 – 30 V DC @ 150 mA (max)
Display PC or laptop with VGA (not included)
Size 160 x 62 mm (6.3 x 2.4 inch)
Weight in Air 550 g (19.4 oz)
Operating Temp. -10°C to +50°C (14°F to 122°F)
Approvals RINA Type approved
Testing Tested to 500 m (1,640 ft) depth
Communication RS-422, Simplex Single Pair or 2400 Baud (RS-232 9600 Baud output available as special order)
Standards Designed for EN 15317
Compliance CE, UKCA, RoHS
Warranty 3 years on gauge and 6 months on probe
  • Cygnus Mini ROV gauge 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.
Weight 5 kg

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

To compliment our ultrasonic thickness gauges we offer a range of ultrasonic probes. The performance of any ultrasonic thickness gauge relies heavily on the probe and its suitability to the material being measured. Therefore, selecting the right probe is vital. All Cygnus SINGLE CRYSTAL probes are made from stainless steel and include replaceable membranes for long life, requiring no zeroing and have a high linear accuracy.

Engineered Probe Handling Solutions

Complementing the Cygnus Mini ROV Mountable thickness gauge, the Cygnus G1 is designed for use on observation, inspection and light workclass 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 gauge 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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