Weir-Jones Group



Automatic Draught Indicator System

Typically, draught measurement systems require the installation of pressure transducers, which penetrate the hull of a vessel below the waterline. These systems operate by estimating the draught based on the pressure readings at predefined locations of the hull and they are subject to errors due to wave action and water density. The pressure transducer penetrations are inaccessible; they can only be serviced when the vessel is in dry dock. The installation and maintenance of such systems must be scheduled either during construction or when the vessel goes for a major refit, which makes these types of systems very expensive to maintain.

Weir-Jones Engineering offers an innovative method for vessel draught measurement by accurately defining the position of the water plane in real-time. This is a truly non-invasive draught measurement technology and is known as Automated Draught Indicator System, or ADIS™. The ADIS™ system is equipped with multiple ultrasonic transceivers mounted above the waterline. In the standard configuration, each transceiver generates short bursts of energy and captures the reflections from the water surface. The embedded microprocessor in the sensor measures the travelling time of the generated energy wave and accurately determines the distance of the mean water surface from the sensor's position and is accurate to +/-10mm.

ADIS™ can be deployed on vessels of any kind and delivers a set of customized information for the specific hull by intelligently processing relevant information. The Automatic Draught Indicator System is designed to output all draught, freeboard, trim, and tons-to-go information through an isolated RS-485 port with an update rate of one sentence every two seconds.The output sentence structure is defined by the NMEA 0183 Version 2.20 Standard.This information can then be used by other control/communication systems onboard the vessel.
Any hull-specific calibration can be performed quickly and easily on site. System maintenance and repair are carried out by replacing plug-in components during routine maintenance windows for the vessel. A failed board or transceiver is replaced quickly and easily with minimum possibility for error.
Enclosures are constructed of 100% corrosion-resistant material and are designed for extreme conditions and long service life.

ADIS™ is part of The Weir-Jones
Groups Reduced Carbon Footprint 
suite of solutions for the reduction
of motor vessel emissions.