Ultrasonic Digital Thickness Gauge, Datalogging, Model 3 by Cygnus

Ultrasonic hand-held digital thickness data logs up to 200,000 points, is easy to use, and interfaces to a PC using Windows software.




  • Simple Linear Data Logging mode with a capacity of up to 5000 points in each record
  • Grid Based Data Logging mode uses simple XY grids for up to 5000 points
  • Template Based Data Logging mode features definable measurement points, minimum and reference thickness values and up to 40 configurable user fields to collect additional information
  • Facility to add additional radial measurements around any chosen point
  • Alphanumeric data entry via phone style keys
  • Auto-Log function automatically logs stable thickness measurements for one-handed operation
  • Data stored on internal SD memory card for security
  • Velocity Lookup Table can be customised by the user
  • USB connection to computer without driver installation
  • Supplied with:
    - Data Logger Manager software for generating reports and transferring data between the gauge and computer
    - Microsoft Excel add-in to easily import data into blank worksheets or Excel templates
  • Super-bright multi-colour LED gives visual feedback
  • Housed in a rugged, IP65 rated aluminium enclosure
  • Gauge senses probe type and automatically adjusts setting for optimum performance
  • LCD graphic display with automatic white backlight
  • Simple gauge and menu operation
  • Secure, twist-to-lock probe connection (BNC)
  • ”Deep Coat” mode for coatings up to 20 mm (3/4") thick
  • Protective silicone sleeve offers maximum protection
  • Rugged probe cable designed for superior flexibility.



  • 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.


With multiple echo, readings are taken by measuring the time delay between any three consecutive backwall echos. The time of T1 (coating thickness) is ignored. The times of T2 and T3 are equal to the time that it takes to travel through the metal. Only by looking at three echoes can the measurements be automatically verified (where T2 = T3).


Kit Contents
  • Instrument
  • 2.25 MHz x 1/2") diameter probe
  • operation manual
  • carry case
  • protective silicone sleeve
  • adjustable neck strap
  • accessory
  • pouch
  • couplant gel
  • spare membranes
  • membrane couplant
  • membrane locking ring key
  • test block, 3 x AA Procell batteries
  • software
  • USB cable and optional belt/harness clip

Maintenance and safety checks of metal thickness for:

  • Ships
  • Storage tanks
  • Pipelines
  • Bridges
  • Street lighting columns
  • LPG vessels
  • Road transport tankers
  • Offshore platforms
  • Piers, jetties and pilings
  • Processing vessels
  • Cranes.

...plus many more.



  • Can be carried on the waist belt for ease of climbing.
  • Highly water / dirt / dust resistant.
  • Rugged construction - shock proof.
  • Stable calibration - linear accuracy - no zero adjustment.
  • Self-verification of the measurements to ensure accuracy.
  • Choice of probe options.
  • Echo strength displayed to aid measurement.
  • Dual displays: bright LED and graphical LCD displays.
  • Probe protected by a membrane against wear and tear.
  • Metric / Imperial switchable.


  • Versatile and easy to program, simple operation.
  • Templates allow for Single Point, Grid Point, Key Point or Multi-Point setup.
  • Windows® Explorer style menu system.
  • Measurements logged with one simple key press.
  • PC interfaces.
  • Dedicated Windows® compatible software on CD.
  • Out-of-tolerance alarms.
  • Storage for 200,000 measurements.


Sound velocities between 2000 and 7000 m/s (0.059 and 0.31 in/microsec)

covers virtually all common engineering materials

Measurement Range in Steel

3 mm - 250 mm (0.100" - 9.995") with 2.25 MHz probe

2 mm - 150 mm (0.065" - 6.000") with 3.5 MHz probe

1 mm - 50 mm (0.045" - 4.000") with 5.0 MHz probe


0.1 mm (0.005") when calibrated in accordance with Cygnus Instruments Calibration Procedures


0.1 mm or 0.05 mm (selectable) (0.005" or 0.002")


Single crystal soft-faced compression:

  • 6 mm (1/4") - 5 Mhz
  • 13 mm (1/2") - 2.25, 3.5 or 5 Mhz
  • 19 mm (3/4") - 2.25 MHz

(Lower frequency probes offer better penetration on heavy corrosion/coatings)



3 x ‘AA’ alkaline batteries or rechargeable NiMH / NiCD

Battery Life

18 hours’ continuous operation with alkaline batteries


Large liquid crystal display with white backlight - automatically turns off in bright light conditions


85 mm x 170 mm x 25 mm (3.34" x 6.69" x 0.98")


400 g (14.1 oz) (inc. batteries)

Operating Temperature

-10°C to +50°C (14°F to 122°F)

Environmental Protection


Data Output Storage

Internal storage on Flash Memory Card Data output via USB connection

Data Logger (Maximum)

Measurement points per record: 5000
Records: 100
Grid record size: 100 rows x 50 columns
User data fields: 40


CE, British Standard BS EN 15317:2007

(Specification for the characterisation and verification of ultrasonic thickness measuring equipment)


RoHS, WEEE compliant


3 years on gauge, 6 months on probe