Cygnus Underwater UT Tester

Ultrasonic Thickness Tester

A diver-held subsea ultrasonic thickness testing device designed for in water survey and underwater inspection in-lieu of drydocking, providing accurate and reliable through coating measurement.

Key features of the Cygnus Underwater ultrasonic thickness tester include:

  • Multiple-Echo for accurate through-coat measurements, as specified by Classification Societies
  • Deep Coat mode ignores coatings up to 20 mm thick (upon request)
  • Heavy duty sealed unit with double O-ring protection
  • Rugged, durable, shock-proof construction
  • Easy and stable calibration – no zero adjustment
  • Echo strength indicator to aid measurement
  • Two rechargeable battery packs with charger
  • APR (Auto-Probe Recognition)
  • TSR (Topside Repeater) options:
    Option A – Palm-held TSR or;
    Option B – CygLink software for data logging and remote display.

Key benefits of the Cygnus pioneered Multiple-Echo technique include:

  • Measures remaining metal thickness on corroded and coated structures
  • All measurements are error checked using 3 return echoes to give repeatable, reliable results
  • Accepted by all major classification societies
  • Greatly reduces inspection time and costs
  • Echo strength indicator to aid measurement.
MaterialsVelocities between 2,000 and 7,000 m/s – covers virtually all common engineering materials
Measurement Range in Steel1 – 250 mm depending on selected probe and configuration, material and temperature
Accuracy±0.1 mm or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Resolution0.1 or 0.05 mm (selectable)
Probe OptionsSingle crystal probes
Power2 x rechargeable NiMH battery packs
Battery Life2 x 20 hours continuous measuring (with fully charged battery packs)
DisplayLarge, bright LED display
Size238 x 85 mm (inc. battery pack and probe head)
Weight977 g (inc. batteries)
Operating Temp.-10°C to +50°C
Environmental ProtectionIP68 continuous 300 m rating
StandardsDesigned for EN 15317
ComplianceCE, UKCA, RoHS
Warranty3 years on tester
6 months on probe

Instrument body, probe and nosecone assembly with 1 m cable, lanyard, molykote, tommy bar, 2 rechargeable NiMH battery backs, battery charger with leads, membrane couplant, spare O-rings, spare membranes, membrane locking ring key, 15 mm test block and calibration jumper lead.

Weight5 kg

Cygnus Underwater Gauge Standard Kit with 2.25MHz 13mm Standard Probe, Cygnus Underwater Gauge Standard Kit WITHOUT PROBE

TSR Remote Display Unit

TSR is a remote display unit connected to the underwater tester with an umbilical cable and displays the thickness measurements at the surface in real-time during the survey.

TSR options: (A) Palm-held TSR or; (B) CygLink software (Windows based) for data logging and remote display.

CygLink Software

CygLink is a Windows® based application used to display, log and transfer thickness measurements at the surface. The software can generate PDF reports and export to CSV files, allowing for ‘after the event’ analysis of logged measurements. Designed for Windows 7 and above.

3 reviews for Cygnus Underwater UT Tester

Avatar Of D.miller


Jan 09, 2015 1:12 PM

I received the Cygnus 1 in 1987 and used it continuously for 10 years on submerged pipelines, without any problems. After that period it was mainly used for ship board survey inspections of hull thickness testing which is still in use today with the same set of batteries. I cannot praise this piece of equipment enough as it has given unbeatable service in extremely hostile environments without failing at any time. I would recommend this unit to anyone looking for a reliable ultrasonic thickness testing unit.

Avatar Of Anders P.

Anders P.

Jul 01, 2019 1:11 PM

Since my purchase of the Cygnus 1 Underwater gauge in 2005, I have had no problem with the gauge, and it’s still going strong after 14 years of use by divers, completing many underwater inspections across countries in Africa and Europe. There were times where it wasn’t easy to get readings on odd surfaces or through small marine growth, but we succeeded eventually.

Avatar Of Santosh G.

Santosh G.

Apr 23, 2020 1:11 PM

There are many in the industry who have been using Cygnus meters for more than 20 years. I myself have used their underwater thickness gauge along with regular and Intrinsically Safe UT meters from the early stages of my career – and that goes back to more than 25 years for sure. TechCorr, a global leader of inspection services, uses Cygnus Gauges for pipelines, tanks and vessel inspections. Our operators particularly love Cygnus – as readings come quick and accurate.

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