Ultrasonic Hatch Cover, Watertight Door and MCT Tester

Portascanner® WATERTIGHT PLUS is a handheld watertight integrity tester for inspecting the watertightness and weathertightness of hatch covers, watertight doors and multi cable transit seals in marine environments. It is a portable, handheld solution which can be used by a single operator to test a large number of different hatches and seals in one quick and easy inspection.

P/N: 509004-WTPLUS
NSN: 6625-99-257-8336
IMPA MSG P/N: 652778


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Test Hatch Covers as Recommended by P&I Clubs

Ultrasonic hatch cover testing is the only recognised method by P&I Clubs around the world in determining weathertightness in hatch covers. Using the Portascanner® WATERTIGHT PLUS, the crew is able to locate leaks and report them in decibel (dB) and percentage Open Hatch Value (%OHV) which is a Classification Society requirement.

The hatch cover is considered weathertight when the %OHV is less than 10%, and the Portascanner® WATERTIGHT PLUS calculates this figure automatically to enable quick and seamless testing by the crew. This calculation requirement complies with DNVGL-CP-0484 and IACS URZ17. Suitable for use on all classes of bulk carriers, offshore structures and various marine vessel types.


Regulatory Compliance With Ease

Portascanner® WATERTIGHT PLUS’ ABS Type Approval and RINA Classification Society Acceptance establish it as an industry-approved solution to watertight integrity testing and regulatory compliance.

IMO SOLAS Reg II-1/21.3 states that “The watertight doors and all mechanisms and indicators connected therewith shall be periodically inspected at sea at least once a week.”

Conventional tests to meet this regulation like the Chalk test and Hose test are inferior to the quick and clean testing process which Portascanner® WATERTIGHT PLUS. These processes require multiple operators, take longer, and in the case of the hose test, can be messy.

Portascanner® WATERTIGHT PLUS is used by a single operator to detect leaks in the hatch or structure and it can give an exact value of the severity of the leak. This allows these weekly inspections to be conducted faster.


Three Operational Modes

Portascanner® WATERTIGHT PLUS has three operational settings and adjustable gain to make it a versatile solution to a wide range of structures:

Decibel (dB): Using the logarithmic Decibel scale, this expresses the received signal in the raw form which marine safety regulations dictate is necessary.

Linear/Numerical: This mode expresses the received ultrasonic signal on a linear rather than logarithmic scale, allowing for easier interpretation of results.

Open Hatch Value (OHV)%: Specific for hatch covers, this mode displays the leak size as a percentage of the saved value for a hatch cover as if it were fully open.

Powerful Generator

There is a misconception that ultrasound travels in only one direction, it actually reflects off surfaces, giving you full coverage of the cargo hold. Having 5 transducers is as powerful as heavy and bulky older style generators, which are still used on most basic models in the market.

The Portascanner® WATERTIGHT PLUS generator fills the entire cargo hold with ultrasound. The receiver detects the smallest of ultrasonic signals so that leaks as tiny as 0.06mm can be located. The specific power output of the generator is chosen to fill the space and works in tandem with the receiver without being overpowered to saturate the receiver. This ensures that Open Hatch Values remain a meaningfully quantitative measurement through which to assess watertightness /weathertightness effectively. “Overpowered” receivers cut off the reading at an arbitrary maximum which would make the Open Hatch Values meaningless.

It is important to avoid a maximum reading for the OHV because a maximum reading could, actually, be anything above the maximum and is therefore useless in comparing to the closed hatch value, when the measurement is taken.

What's In The Box

  Portascanner® WATERTIGHT PLUS : Handheld Receiver Unit
  Portascanner® WATERTIGHT PLUS Flexible Receiver Wand with Aluminium Rod Extensions: Receives and measures ultrasound
  1.8m BNC Coaxial Cable: To connect the wand and main unit
  Portascanner®5-transducer Ultrasonic Generator: Emits ultrasound to be received by the sensor wand
  Headphones: To provide an audio output to the digital readout
  User Manual: Guidance on how to use the equipment
  Calibration Certificate: Product test certificate
  Robust Carrying Case: To store the equipment

Technical specifications

Technical Specification

Main Unit: 229x85x35 mm (L x W x D)

Generator: 147x89x54 mm (L x W x D)

Sensor Wand: 230mm (L) x 35mm (Diameter)

Unit Weight

Main Unit: 400g (with batteries)

Generator: 400g (with batteries)

Power Supply

Main Unit: 1x PP3 9V

Generator: 3x PP3 9V

Battery Life

10 Hours Continuous Use

Sensor Type

35mm Flexible Sensor Wand

Sensor Connectivity

1.8m BNC Coaxial Cable

Generator Frequency


Operating Temperature

-20°C to +70°C (-4°F to +158°F)


55 x 28 mm Backlit LCD Display

Minimum Leak Detection

0.06 mm ±0.02mm Leak Diameter

Classifications & Approvals

RINA Classification Society Accepted, ABS Type Approved, NSN: 6625-99-257-8336


UKCA, CE, Coltraco is ISO 9001 and ISO 14001 Compliant

  • Main Unit: 3 Years
  • Generator: 3 Years
  • Sensor: 1 Year
  • Technical Support: Lifetime of the unit

See the Portascanner® WATERTIGHT PLUS in action.

Frequently asked questions

No, the Portascanner® WATERTIGHT PLUS can be used with people in the room, as long as they do not directly interfere with the test (i.e. standing directly between the generator and receiver).
It does not matter as long as there is clear line of sight between the generator and the structure being tested. Generally, it is advised that the generator should point directly at the structure to be tested, positioned with transducer approximately centred on the structure at a distance of at least half a metre.
No, it does not matter, the test should be performed from whichever side is most convenient and practical. For example, if the operator is testing a door that leads onto a corridor, we would suggest placing the generator inside the room and performing the measurements from the corridor so as not to obstruct the full width of the corridor.
Yes, there is no complicated equipment required for a test, just the generator and the hand-held Portascanner® WATERTIGHT PLUS unit. In the case of an emergency, the operator may simply leave; all that may happen is the generator will use battery power and may need to be recharged.
Yes, the Portascanner® WATERTIGHT PLUS is designed to be durable and rugged, making it suitable for use in all types of weather conditions.
No, the Portascanner® WATERTIGHT PLUS requires minimal maintenance and is designed to be user-friendly and easy to use.
Yes, the Portascanner® WATERTIGHT PLUS is suitable for use on all types of ships and marine structures, including warships and offshore oil & gas platforms.

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