Cygnus Instruments

Intrinsically Safe for use in harsh and tough environments

The Cygnus 1 Intrinsically Safe is a rugged, shock-proof multiple echo ultrasonic surface thickness gauge designed for safely measuring metal thickness to determine wastage or corrosion in potentially explosive environments. By using multiple echo technology the metal thickness gauge measurements are error checked using 3 return echoes to provide repeatable, reliable results.

Supplied ready to use in a protective carry case with 2 rechargeable batteries, the Cygnus 1 Intrinsically Safe can achieve up to 10 hours of continuous testing before recharge is necessary.

Certified Intrinsically Safe to:


Cygnus 1 Intrinsically Safe Brochure   Enquire about the Cygnus 1 Intrinsically Safe


  • Certified Intrinsically Safe to: ATEX Marking Group I & Group II, CSA Class 1 Group A, B, C & D Division 1
  • For use in Zone 0, Zone 1 hazardous areas
  • No plant shutdown or hot work permit necessary
  • Heavy duty sealed unit - IPX5 and IPX7 rated - highly water / dirt / dust resistant
  • Rugged, durable, shock proof construction
  • Stable calibration - linear accuracy - no zero adjustment
  • Self verification of the measurements to ensure accuracy
  • Various probe options
  • Two rechargeable batteries with charger
  • Displays sound velocity settings
  • Echo strength indicator to aid measurement
  • Bright LED display with polarised filter
  • Probe frequency selectable
  • Low battery warning
  • Metric / Imperial switchable
  • Also approved for use in mines.


For optimum performance of the ultrasonic thickness gauge it is essential to utilise the appropriate probe for the specific material being tested. Here below are the probe options available.

Single crystal soft-faced compression
6 mm - 5 MHz
13 mm - 2.25, 3.5 or 5 MHz
19 mm - 2.25 MHz
 For more details on probe selection, please go to the Ultrasonic Probes page.

Product Enquiry: Cygnus 1 Intrinsically Safe

Please answer the above question to verify that you are human, this helps us respond promptly to you by reducing junk mail.


Materials Sound velocities between 2000 m/s and 7000 m/s - covers virtually all common engineering materials
Measurement Range in Steel 3 mm - 250 mm with 2.25 MHz probe
2 mm - 150 mm with 3.5 MHz probe
1 mm - 50 mm with 5 MHz probe
Accuracy ±0.1 mm (±0.004”) or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Resolution 0.1 mm or 0.05 mm (selectable)
Probes Single crystal soft-faced compression
6 mm - 5 MHz
13 mm - 2.25, 3.5 or 5 MHz
19 mm - 2.25 MHz
Power NiMH rechargeable battery pack
Battery Life 10 hours' continuous operation
Display Large, bright LED display
Size 235 mm x 75 mm
Weight 1040 gm - with probe
940 gm - with fixed head probe
(including batteries)
Operating Temp -10°C to +50°C
Certification ATEX
{Ex} I M 1 Ex ia I Ma (Ta = 0 to 45 C)
{EX} II 1 G Ex ia IIC T6 Ga (Ta = 0 to 45 C)

CSA Class 1 Group A, B, C & D Division 1
Environmental Protection IPX5 & IPX7
Compliance CE, British Standard BS EN 15317:2013

Kit Content

Instrument, heavy duty probe (2.25 MHz 13 mm diameter), 2 rechargeable batteries and battery charger, spare membranes and ‘O’ rings, steel test block, calibration trim tool, couplant, operation manual and carry case.


  • Chemical plants
  • Dry, dusty environments where ignition could occur
  • Fuel depots
  • Grain processing plants
  • LPG vessels
  • Oil and gas production facilities such as pipelines and offshore platforms
  • Petroleum, chemical storage tanks
  • Processing vessels
  • Road transport tankers carrying potentially explosive contents
  • Structures and facilities in mines.

Download brochures

Product Reviews

  • 08 December 2016
    Rated 3 out of 5
    This will certainly be useful in the inspection and maintenance of our shipping industry.
  • 17 February 2016
    Rated 4 out of 5
    I love this machine. Even for corroded areas, it has proven to be reliable. I like the fact that you can change the Db settings to enable better penetration and sensitivity on corroded surfaces. We have to use Ex certified equipment in the offshore oil and gas industry which makes this UTM gauge ideal. I would give it an 8/10. (Only because it's design makes it awkward to use when the operator is using Rope Access as a means of carrying out the inspection.)

See All Reviews

Write a Review


Related Products

  • Cygnus 2+ Hands Free

    Cygnus 2+ Thickness Gauge

    The latest Cygnus 2+ Hands Free multi-mode ultrasonic thickness gauge, designed for rope access or belt-mounted applications, now incorporates three versatile measuring modes: Multiple-Echo; Single-Echo; and Echo-Echo.

    Find out more
  • Cygnus Heavy Duty

    Cygnus Heavy Duty

    The Cygnus Heavy Duty is a really rugged thickness gauge that is simple to use enabling accurate metal thickness gauging in harsh environments.

    Find out more

Cygnus Instruments © 2017. All Rights Reserved