MHK ISDB/Instruments/Cygnus Underwater Thickness Gauge

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Cygnus Underwater Thickness Gauge

Manufacturer: Cygnus Instruments
Measurement Category: Condition Monitoring
Operating Environment: Underwater
Version(s): Probes: 2.25 MHz, 3.5 MHz, 5 MHz
Mounting: Handheld.
Communication Protocol: Internal Logging
Operating Mode: Free Streaming, Polled
Power Supply Type: Battery
Power Specification: NiMH rechargeable battery; 30 hours' continuous measuring


The Cygnus Underwater is the original diver held subsea multiple echo Ultrasonic Thickness Gauge. The unit is depth rated to 300 metres and it provides an accurate metal thickness measurement through coatings up to 20mm thick. The bright LED display ensures easy viewing even in poor visibility conditions. Topside options available.

Instrument Measurements

  • Corrosion (Structural Health)
  • Wall Thickness (Structural Health)

Measurement Specifications
Measurement Range (steel, probe dependent): 3mm - 250 mm (2.25 MHz); 2 - 150 mm (3.5 MHz); 1 - 50 mm (50 MHz)
Resolution: 0.1 mm or 0.05 mm
Accuracy: 0.1 mm (calibration dependent)

Optional Sensors

No optional sensors provided. Please add sensors.

Notes, Considerations & Recommendations

Umbilical length to topside unit. Topside units are available as optional upgrade.

User Experience

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