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Datum Electronics Torque Measurement

Instrumentation to Measure Power, Torque and Speed

Datum Electronics torque measurement can be used in a number of different applications and for different requirements, including monitoring and control, power management and increased efficiency savings. Our range of torque instrumentation has been designed to measure/control power, torque and speed.

Datum torque measurement is an important tool in analyzing engine performance:

  • monitoring and control
  • power management
  • increased efficiency savings
  • power monitoring

Datum Electronics rotary torque sensors and rotary torque measurement solutions are available from 10 Nm up to 500,000 Nm; power and torque monitoring systems for shafts from 5mm diameter up to 110 0mm diameter. Specialized custom modular solutions can be cost effectively engineering to meet your specific requirements.


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Datum Electronics Torque Transducers

Robust and reliable, accurate to 0,1. Standard range of rotary and static torque transducers ranging from 10 Nm to 80,000Nm. Non-contact signal transmission and a wide rangeo of outputs RS232/RS485/4-20mA.

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    Datum M420 Rotary Torque Transducers

    Industry standard torque transducer with rotary shaft and static body. Designed to fit most applications.

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    Datum RS420 Rotary Torque Transducers

    Non-contact rotary torque transducers designed to fit in line with any drivetrain or test bed using a spline or keyway shaft.

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    Datum 420 Rotary and Series 410 Static/Reaction Torque Transducers

    Designed to fit nline with any drive train or test bed using standard DIN size couplings. With Flange couplings at either end of the torque transducer it has many advantages over other torque measurement systems.


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Marine Torsionmeter Systems

Marine Torsionmeters and Shaft Power Meters which measure the on-shaft torque and shaft power of a ships drive shaft. We offer a competitively priced, flexible system which is capable of measuring shafts between 150mm - 1100mm diameter.

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    Datum Commercial Marine Torsionmeter

    Accurately measure the on-shaft torque, the speed of the shaft(s) rotation and the power that is going through the shaft(s). Flexible system measures shafts between 150mm - 1100mm diameter.

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    Datum Series 420 Marine Torsionmeter System

    Datum Electronics Series 420 Marine Torsionmeter System provides an accurate tool to assess and monitor propeller shafts on ships by measuring shaft speed, torque and power. This Torsionmeter system was designed for the harshest of environments on-board the Royal Navy Hunt & Sandown Class vessels. The system can be installed on a ships propeller shaft or shafts and uses strain gauge technology providing a highly accurate non-contact method of measuring shaft torque.

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    Datum Series 420 Shaft Power Meter

    The Datum Electronics Series 420 Shaft Power Meter provides an accurate tool to access and monitor the performance and efficiency of the ships transmission system. The transducer accurately measures the on-shaft torque (kNm), speed of the shaft rotation (rpm) and the power (kW) that is going through the shaft. The system can be applied to both single and dual shaft ship systems. The data is transmitted from the shaft as serial data which can be displayed and processed off-shaft. The information is also NEMA based and can be directly interfaced to ship management systems (NEMA).

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    Datum Series 430 Torque Trials Kit

    The Datum Electronics Marine Trials Kit will supply all equipment necessary for assembly of a shaft torque (power) trials kit which can be utilised for industrial and marine ship shafts between 90mm - 1200mm as standard.


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Why a Measurement of Shaft Power can save you Money on Fuel and Maintenance

When running a complex system such as a ship we have some of the information we need such as a record of how far the ship has sailed and how much fuel we used. We also have information regarding the maintenance of the ship.

To determine the best way of saving fuel we need to look at where it is used and where inefficiency can occur.

The use of a power meter gives us four key advantages.

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  • Accurate reference value for transmitted power

    It gives us an accurate reference value for the power transmitted through the shaft. This can be used to take a series of readings before and after any changes; such as hull cleaning or engine services occur. The data taken before and after introducing changes to: such as hull and propeller cleaning, changes to operating speeds, changes to the propeller configuration etc will show the direct value of the change and ongoing information to show the ongoing efficiency.

  • Features individual parts of the drive train

    The power meter allows us to look at individual parts of the drive train. On a typical ship system with a diesel generator serving both the hotel load and the ships propulsion. For the diesel engine we can give an accurate measurement of the power efficiency (Power Generated v Fuel). For the propeller we can give an accurate measurement of the power used, this can be compared with the miles travelled at various sea states. An increase in power per mile will indicate hull and propeller fouling and clearly identify the costs in fuel terms of a fouled hull. A ship running with a fouled hull can be up to 10% less efficient than a clean hull.

  • Identification of the optimum running speed

    By plotting the Propeller power against different sea states and running speed you will be able to identify the optimum running speed for each sea state. The results of the power curves actually measured are often significantly different to the theoretical curves. Using an actual curve rather than a theoretical or design curve will save a lot of fuel. The theoretical or design curve may have been validated with a new ship in trials rather than in ongoing operation. Changes in the actual curve with hull condition can also be identified. Use of the correct power curve can increase the operating envelope of the engine and can save 2-4% of the fuel used.

  • Dynamic Data

    By looking at the dynamic data from the Datum Shaft Power Meter you can see additional information, such as the cyclic torques from the propeller which can change with propeller degradation and sea conditions. The dynamic data from a diesel engine shaft will show the individual cylinder drive values and can identify the engine tuning status. Using this information can again save up to 5% of the diesel generator fuel by simply identifying when the engine needs to be serviced.