Cygnus ROV Mountable

Ultrasonic Thickness Meter

Specifically designed to be mounted on to larger work class remotely operated vehicles, this subsea ROV mountable ultrasonic thickness meter is depth rated to 1,640 ft (500m). This unit is versatile and designed to measure metal thickness in the most harsh of subsea operating conditions – all without the need to remove any coatings.

Key Features of the Cygnus ROV Mountable Meter

  • Multiple-Echo mode for accurate, through-coat measurements (as specified by Classification Societies)
  • Selectable Deep-Coat mode ignoring coatings up to 0.8 inch thick
  • Fitted with a safety Pressure Relief Valve and Securing Eye
  • Supplied with CygLink software to display and process measurements on a computer at the surface
  • Simple calibration at the surface – via CygLink software or TopSide Repeater (TSR) unit
  • Wet mateable ‘MC’ style underwater connectors
  • Removable end plate for full serviceability
  • Optional Topside Repeater (TSR) unit allows readings to be superimposed onto ROV’s camera screen and / or displayed remotely
  • Optional purpose-built ROV transducer handlers for optimal alignment.

Cygnus-Pioneered Multiple Echo Technique

  • Accepted by all major classification societies
  • Measures remaining metal thickness on corroded and coated structures
  • All measurements are error checked using 3 return echoes to give repeatable, reliable results
  • Echo strength indicator to aid measurement
  • Saves inspection time and costs.

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’.

MaterialsVelocities between 0.0800 and 0.2780 in/microsec (2,000 and 7,000 m/s)
Measurement Range in Steel0.040 – 10 inch (1 – 250 mm) depending on selected transducer 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 (0.1 or 0.05 mm) (selectable)
Transducer OptionsSingle crystal transducers
Power7.0 – 30 V DC @ 150 mA (max)
Size5 x 3.5 inch (127 x 90 mm)
Weight in Air2 lb (900 g)
Operating Temp.14°F to 122°F (-10°C to +50°C)
TestingDepth rated to 1,640 ft (500 meters)
CommunicationRS-422, Simplex Single Pair or RS-232 TXD 2400 or 9600 Baud (selectable via DIP switches)
StandardsDesigned for EN 15317
ComplianceCE, UKCA, RoHS
Warranty3 years on meter and 6 months on transducer
  • ROV power and data cable with flying leads
  • Membrane couplant
  • ‘K3’ RS-422/485 to RS-232 converter
  • RS-232 to USB converter
  • ROV transducer cable with heavy duty remote transducer (5 m)
  • Cygnus ROV meter
  • USB flash drive CygLink installation and operating manual in PDF format
  • ROV power and data test cable and connectors
  • Accessories in case: spare O-rings; spare membranes; membrane locking ring key; 15 mm test block; spare 1A fuses; 3 mm allen key; silicone grease sachets.

Cygnus ROV Mountable Gauge Standard Kit – 2K Model with 2.25MHz 13mm Standard Probe, Cygnus ROV Mountable Gauge Standard Kit – 2K Model – WITHOUT PROBE

Engineered Transducer Handling Solutions

Constructed from 316 stainless steel throughout, the W1 transducer handler can be held by a manipulator arm and is ideal for use on Work Class ROVs. The Cygnus S1 and G1 Transducer Handlers are developed for use on inspection, observation or light work-class ROVs.

Topside Repeater Remote Display Unit

The Cygnus Topside Repeater is a remote display unit connected to the meter 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.

2 reviews for Cygnus ROV Mountable

James M.

May 16, 2015 1:03 PM

This is to testify that over the last 23 years of working offshore I have come across Cygnus instruments both as a Diver and as an ROV supervisor.

As a diver I held a CSWIP 3.2u Subsea inspection qualification for 10 years.
During the last 13 years I have had occasion to be involved with the ROV mountable systems on two occasions. In both instances the probe and Subsea housing were fitted to work class vehicles. The systems were able to take UT readings to client satisfaction.

On one setup we attached the probe to a 7 function manip (T3) which gave us extra options whilst trying to take readings on non vertical or variable angled faces.
The system is designed to ensure that it will only display correct readings. In other words you either get a correct reading or no reading at all.
Reading through hard marine growth is not practical. Reading through soft marine growth or protective coatings presents no real issues.
From operational experience am aware that all readings eliminate the coating thickness so only the true metal thickness is displayed.

Should I need to specify an Ultrasonic digital thickness gauge for Subsea ROV use I would choose either the Cygnus -1000m* or the -3000m* ROV mountable gauge depending on operational depth.
The -3000m* unit of course will work shallow or deep, so is probably a better all round option for future project use.

*1000m and 3000m are previous models. Available now is the 2000m model.

George G.

Nov 04, 2020 1:01 PM

I have used Cygnus UT systems for many years and to me they deliver what’s required for quick and reliable results. As we move even more towards ROV based operations, having a cost-effective wall thickness capability is a key component in our service offering- and Cygnus does just that!

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