The Marine Shaft Power Meter Systems developed to provide ongoing power monitoring data on propulsion shafts, thrusters & diesel generators, and are commonly used for fuel economy and equipment maintenance planning programs.

Dattum Marine Shaft Power Meter System for Fuel EfficiencyThe Energy Efficiency Design Index (EEDI) and the Ship Energy Efficiency Management Plan (SEEMP) requirements were made legally binding by the MARPOL Annex VI, the first climate change treaty to be adopted since the Kyoto Protocol. The technical requirements in this treaty are aimed at promoting the use of more energy efficient (less polluting) equipment and engines. In determining the best way to save fuel, we must initially understand how it is utilised and how efficient the vessel is, in converting the energy. A complex ship system will already provide much of the information required to ascertain fuel usage and maintenance of the vessel but a measurement of shaft power can show the efficiencies.

As a result, we developed Marine Shaft Power Meter Systems to meet the requirements of the Commercial Marine customers to provide ongoing power monitoring data on ships. The current usage of the systems is to provide data for fuel economy and equipment maintenance planning programs. Fitted at an early stage the torsion meter system can be used in Ship Acceptance Trials and from that point on be a measure of the condition of the ship throughout its life cycle.

Marine Shaft Power Meter Systems

Shaft Power Meter Features

  • Fully Modular System: Shafts from 150mm to 1,100mm (and above)
  • 100% Contactless
  • Maintenance Free
  • Highly Reliable
  • Instrumentation Accuracy: 0.1%
  • System Accuracy: 0.1%
  • System Repeatability: 0.05%
  • Multiple Outputs: RS485, RS232, Modbus, Ethernet, 0-10V, 4-20mA, and USB Logging
  • Operating Temperature: -15˚C + 80 ˚C
  • Environmental Sealing: IP67
  • Supply Voltage: 110 – 230 Vac, III or I, AC or DC 12-24V
  • Can Be Installed and Commissioned in 1-2 days
  • One-Time Calibration (No Re-Zero or Re-Calibration Required)


For us, the big advantage of the Datum Torque meter is its modular design. As the rotor belt’s size is adjustable, it can fit on any size of shaft, which gives the system great flexibility. The installations are carried out by very knowledgeable and well-experienced commissioning engineers, which is complemented by an excellent level of pre and after-sales support provided by the broader Datum team. The Datum Torque meter plays an important role in the efficient operation of our performance monitoring system by generating reliable data which we can use to optimise voyages and maintain our fleet.

Oldendorff Carriers GmbH & Co. KG

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Shaft Power Measurement

Shaft Power is an essential Input to Ship Performance Monitoring Systems. The data from monitoring actual power levels provide an accurate reference point to assist with assessing:

  • Engine Performance Monitoring
  • Ship Propulsion Efficiency
  • Hull Condition
  • Propeller Condition
  • Specific Fuel Consumption
  • Operational Efficiency Planning
  • Ship Condition Changes

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What Can a Marine Shaft Power Meter provide?

A shaft power torque meter accurately measures the power transmitted through a shaft, this enables you to measure the actual power that an engine is delivering to the propeller or generator.

The Shaft Power and Torsion Meter System is an essential tool to help in the reduction running costs from:

  • 1 Fuel Saving
  • 2 Improved Maintenance Scheduling
  • 3 Equipment Protection

The same system will provide data to assess the value of new equipment and operating procedures

  • Changes to Operation
  • Changes to Fuel Types
  • Changes to Hull Coatings

Datum MarineShaft Power Meter Ship Performance, Preventative Maintenance and Condition Monitoring

White Paper

How Measuring Shaft Power Can Save Money On Fuel and Maintenance

Want to know more about how shaft power measurement can save money on fuel and maintenance? Download our white paper from Ship Technology here.SaveSave




      Commercial Marine Shaft Power Meter Handbook
      Datum Electronics Shaft Power Meter Drawing Pack
      Datum Marine Shaft Power Meter Product Overview
      Datum Electronics Shaft Power Meter Drawing Pack