VERSATILE. RELIABLE. COMPLETE.

The Cygnus 4+ is a lightweight, rugged wall thickness gauge for a wide range of applications. With three measuring modes, a live A-scan display and sequential data logging, the instrument is suited to both routine inspection and detailed corrosion surveys.

Cygnus 4+ for high-temperature measurement on in-service assets

Compatible with a high-temperature probe, the Cygnus 4+ measures the wall thickness of in-service assets at surface temperatures up to 300°C, with no cooling period or shutdown required. This makes the instrument particularly well suited to inspections in the refining, oil and gas, energy and process sectors.

  • Multiple-Echo mode for accurate through-coating measurements, meeting the requirements of classification societies
  • Echo-Echo and Single-Echo modes for heavily corroded metals with little or no coating
  • Deep Coat function ignores coatings up to 20 mm thick
  • Live A-scan supports visual verification of measurement results
  • Data logging with A-scan and auto-log function for straightforward reporting
  • Manual and automatic gain control
  • Adjustable min/max limits with visual and vibration alert
  • Large sunlight-readable LCD display on the front panel
  • Safe for use in explosive atmospheres (Class 1, Division 2, Group D per NFPA 70)
  • One and two-point calibration
  • Robust housing: shock and impact resistant (US MIL STD 810G)
  • Splash and dust proof (IP67)
  • Upgradeable to the 6+ variant

The Cygnus 4+ is compatible with three probe types, each suited to specific measurement conditions.

Single crystal probes are used in Multiple-Echo mode. They feature a replaceable wear membrane for long service life, require no zero-point adjustment and offer high linear accuracy.

Twin crystal probes are used in Echo-Echo and Single-Echo modes and are particularly effective on metals with severe back wall corrosion and pitting.

The high-temperature probe is a twin crystal probe for measurements on in-service assets at surface temperatures up to 300°C. No cooling period is required, significantly reducing inspection time. The measurement range is 1.5 to 250 mm, depending on temperature and material.

All probes are made from stainless steel with a hard wear face or replaceable wear membrane. Full probe specifications are available via the downloadable datasheet or on request.

Ideal for:

  • Industrial plant maintenance
  • Ship inspection and hull surveys
  • Civil engineering and structural inspection
  • Oil and gas facilities
  • High-temperature inspection of in-service assets (refineries, energy and process sectors)
  • Rope access
  • Storage tanks and pipelines

Feature Description
Measuring modes Multiple-Echo (3 echoes, ignores coatings up to 20 mm / 0.8 in)
Echo-Echo (2 echoes, ignores coatings up to 1 mm / 0.04 in)
Single-Echo (1 echo)
Materials Sound velocities from 1,000 to 9,000 m/s (0.0390 to 0.3543 in/µs)
Accuracy ±0.05 mm (±0.002″) in Multiple-Echo mode, calibrated on the same material
±0.1 mm (±0.004″) or 0.1% of the reading (whichever is greater) in Single-Echo and Echo-Echo modes
Resolution Multiple-Echo: 0.1 mm (0.005 in) or 0.05 mm (0.002 in)
Single-Echo and Echo-Echo: 0.01 mm (0.005 in) or 0.01 mm (0.001 in)
Probe options Single crystal probes
Twin crystal probes
High-temperature probe
Measurement range in steel 0.8 to 250 mm (0.031 to 10 in), depending on probe, configuration, material and temperature
Connector 2× Lemo 00
Power supply 3× AA/R6 batteries
Battery life Approx. 10 hours continuous measurement
Display 2.4″ QVGA LCD 47 × 37 mm
Dimensions 84 × 130 × 35 mm (3.3 × 5.1 × 1.4 in)
Weight 300 g (incl. batteries)
Operating Temp. -10 °C to +50 °C (14 °F to 122 °F)
Environmental protection IP67
Safe for use in explosive atmospheres: Class I, Division 2, Group D (NFPA 70, Article 500)
MIL STD 810G (high temp. +55 °C, low temp. -20 °C, humidity 95%, immersion 1 m for 30 min.)
Shock and vibration MIL STD 810G (vibration, shock 20g, drop test 1.22 m)
Standard Designed in accordance with EN 15317
Certification CE, UKCA, RoHS

If you are interested in renting the CYGNUS 4+ thickness gauge per day or per week, please contact our office.

Perform the measurements yourself or leave it to our experienced service engineers. We are happy to assist you with technical advice and support.

  • Cygnus 4+ General Purpose
DATASHEET
More WALL THICKNESS METERS AND TUBE MONITORS
Contact