Subsea ACFM

The TSC U31 underwater instruments were developed to offer reliable ACFM® inspection in harsh subsea environments. With a range of standard products covering depths down to 3 km (1.9 mi), the technology and equipment needed to conduct NDT surface crack detection underwater is at your fingertips.

U31D offers all the advantages of ACFM inspection in a small and light package specifically designed to be easily deployed by divers. Capable of inspecting down to 300 m (984 ft), it is ideal for inspecting jackets, pipelines, and subsea structures.

A version of U31 has also specifically been developed for remote subsea deployment using ROVs and working with a selection of ACFM subsea probes. Custom probe designs are also available. Rated to depth of 300 m (984 ft), deep-water enclosures are also available for inspections down to 2 km (1.2 mi). Contact us using the form below to get more information on that solution. 

U31D General Specifications

Dimensions (L × ∅)

260 × 142 mm (10.2 × 5.6 in)


  • In air: 7.6 kg (16.7 lb)
  • In water: 4.3 kg (9.5 lb)

Operating temperature range

–20–40°C (–4–104°F)

Environmental protection

Rated IP54

Probe cable length (topside)

5 m (16.4 ft) (standard)

Umbilical cable length

150 m (492 ft) (standard)

Serial communications cable length

  • 5 (16.4 ft) (standard)
  • Up to 30 m (98.4 ft), if necessary

Maximum operating depth

300 m (984 ft) (standard)

Power requirements

  • 110 V AC
  • 200 mA