Cygnus Product Range

Cygnus manufactures ultrasonic non-destructive testing (NDT) equipment for maintenance and inspection in a wide range of applications including ship surveys, oil & gas platform checks, underwater inspections, hatch cover weather-tightness testing and many more. Cygnus now carries 3 product lines: Ultrasonic Thickness Gauges and an Ultrasonic Hatch Cover Weather Tightness Tester and Ultrasonic Flooded Member Detector. Manufactured in the UK, Cygnus ultrasonic equipment are quality-built, tough and durable which is reflected by the 3 year warranty we supply.



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’ probes are made from stainless steel and have a hard wear face or a wear membrane to protect the probe.

…plant maintenance, civil engineering, marine structures, ship inspections, oil and gas facilities,
offshore platforms, wind farms, rail infrastructure, metals protected by thick/special coatings.

Hard-Wearing and Reliable Ultrasonic Transducers

Variety of Cygnus INOX Probes

  • Stainless steel single crystal probes, used in multiple-echo mode, include replaceable membranes for long life, require no zeroing and have a high linear accuracy.
  • Stainless steel twin crystal probes, used in echo-echo and single-echo modes, have improved measurability on extreme back wall corrosion and pitting.
  • Probes for use with the Cygnus 2, 2+, 4, 4+ and 6+ gauges are fitted with a BNC or Lemo 00 connector.
  • Cygnus DIVE gauge probes are fitted with an integral coiled cable with a Fischer connector.
  • Probes for use with the Cygnus Underwater, Intrinsically Safe and Heavy Duty gauges are fitted to a nosecone that screws onto the gauge body.

Guidelines for Probe Frequency Selection

The probe frequency will be determined by the minimum thickness you need to measure. However, the lower the frequency the more effective the ultrasound will be at penetrating coatings and corrosion. The S2C 2.25 MHz 13 mm (0.5 inch) INOX probe is recommended for the majority of applications as it performs the best on corroded metal and through thick coatings.

Three Versatile Measuring Modes

Multiple-Echo mode uses three error checked back wall echoes to provide the most reliable and accurate remaining thickness measurements, with no need to remove coatings (up to 20mm/0.8 in thick).

Single-Echo mode is ideal for measuring uncoated metals with heavy front and/or back-wall corrosion. Also effective on a range of cast metals, plastics and composites.

Echo-Echo mode works best for measuring heavily corroded metals through thin coatings of up to 1mm/0.04in thick, ideal for measuring painted metals with heavy back wall corrosion.

Useful Guidelines on How to Choose a Probe


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