Datum Electronics marine shaft power meter system for torque, speed and power measurement on rotating shafts
Datum Electronics Shaft Power Meter system installed on a marine propeller shaft with shaft-mounted sensor and touchscreen control unit
Datum Electronics Shaft Power Meter with shaft-mounted torque and speed sensor assembly and touchscreen control unit
Datum Shaft Power Meter components including rotor belt, stator, transmitter and control unit for marine shaft power monitoring
EEXI and CII ShaPoLi bridge interface upgrade for Datum Electronics Shaft Power Meter system displaying compliance dashboard and reporting screens
ECR Compact Repeater touchscreen display for Datum Electronics Shaft Power Meter system showing shaft power, torque, RPM and energy monitoring data
ECR2 Smart Repeater for Datum Electronics Shaft Power Meter with shaft power, torque, RPM, energy usage and SFOC monitoring

Datum SPM:
Shaft Power Meter for Continuous Efficiency Monitoring.

The Datum Electronics Shaft Power Meter (Datum SPM) is purpose-built to deliver accurate, continuous vessel performance data, essential to the commercial marine market.

By providing critical insights into fuel economy, efficiency optimisation, and predictive maintenance, the Datum SPM empowers operators to reduce operating costs, meet emissions targets, and extend the lifespan of critical propulsion systems.

Classification Society Approvals & Certifications




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Key Features
Benefits
Specifications
Downloads
Technical Drawings & CAD Files
FAQs

Key Features

How Does it Work?

The Datum SPM accurately monitors the power transmitted through a shaft by measuring torque using our proprietary strain gauge technology, alongside integrated shaft speed sensors. By
combining these two parameters, the system calculates the mechanical shaft power, providing a true representation of the power delivered by an engine or generator.

The Datum SPM has been used extensively within the commercial shipping industry and has helped operators reduce running costs across fleets by maximising:

  • Fuel Savings by enabling real-time vessel performance optimisation
  • Maintenance Scheduling through predictive insights and reducing unplanned downtime
  • Equipment Protection via early detection of mechanical issues and overload condition

System Modularity and Upgradability

In addition to its stand-alone advantages, the Datum SPM is designed as a modular system, allowing seamless upgrades to incorporate our latest innovative solutions:

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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Benefits

Measuring actual shaft power is a critical input for vessel performance analysis, providing a reliable reference point that supports the assessment of:

  • Engine Performance and Optimisation
  • Hull Condition and Fouling
  • Propeller Condition
  • Specific Fuel Consumption (SFOC)
  • New Fuel Trials
  • Operational Efficiency Planning
  • Engine and Hull Condition Changes
  • New Energy-Saving Devices

Fitted at an early stage, the Datum SPM can by used during ship acceptance trials and serve as a continuous indicator of vessel condition throughout its life cycle.

Stockists

Specifications

CategorySpecificationValue
Instrumentation AccuracyShaft Torque0.1%
Shaft RPM1 RPM (measured at 10 pulses per rev)
Shaft Power0.1%
System AccuracyShaft Torque0.1% + Ke
Shaft RPM1 RPM
Shaft Power0.1% + Ke
KeTotal error in shaft modulus constant and shaft diameter measurement.
System RepeatabilityShaft Torque0.05%
Shaft RPM1 RPM
Shaft Power0.05%
Data Output and DisplayPower, Torque, and RPMThe display presents average values of torque, power, and RPM. The time period of the average values can be configured in the provided software and can vary from 0.1 second to 24 hours.
Total EnergyThe total energy is displayed in kWh from the last reset date. Previous totals vetween resets can be accessed via the menu.
Average PowerAverage power for a period between resets is displayed in kWh.
Power Measurement Data OutputAverage power values are transmitted 10 times per second.
EnvironmentalOperating Temperature0ºC to +55ºC
Storage Temperature-25ºC to +70ºC
Temperature Effect on Readings0.01% FS per degree centigrade.
Environmental SealingShaft-Mounted Equipment and Universal Stator UnitIP65
Control UnitIP54
Panel Mounted Display UnitIP54
PowerSupply Voltage110-230 2Amps Vac, 24Vdc
Calibrated OutputsSelectable Digital OutputsRS-485 BMT-ECR (Required for use with EEXI),
RS-485 NMEA (Not compatible with EEXI),
RS-485 MODBUS (Not compatible with EEXI)
Analogue OutputsSelectable Analogue Outputs x3 Channels for Torque, RPM, and Power4-20mA, 12+/-mA, 0-10V, 0-5V, +/-10V, +/-5V
Additional Environmental Testing (IE60945: 2002 inc Corr 2008 and IACS E10: 2018)Conducted LF ImmunityIACS E10: 2018
Conducted RF ImmunityEN 61000-4-6: 2014
Radiated RF ImmunityEN 61000-4-3: 2006 + A1: 2008 + A2: 2010
Fast Burst TransientsEN 61000-4-4: 2012
Surge ImmunityEN 61000-4-5: 2014 + A1: 2017
Electrostatic DischargeEN 61000-4-2: 2009
Radiated Emissions EN 55016-2-3: 2017 + A1: 2019
Conducted EmissionsEN 55016-2-1: 2014 + A1: 2017
Performance TestIACS E10: 2018
Dry HeatEN 60068-2-2: 2007
Low TemperatureEN 60068-2-1: 2007
Low Temperature (start-up)EN 60068-2-1: 2007
Humidity Test 1 - CyclicEN 60068-2-30: 2005
High VoltageEN 60092-504: 2001
VibrationEN 60068-2-6: 2008
Power Supply VariationEN 60092-504: 2016
Power Supply FailureEN 60092-504: 2016
Insulation ResistanceIACS E10: 2018
Acoustic NoiseSection 8 Table 2.3 IEC 60945: 2002
Compass Safe DistanceSection 8 Table 2.3 IEC 60945: 2002
Static InclinationEN 60092-504: 2016
Dynamic InclinationEN 60092-504: 2016

Downloads

Marine Catalogue Thumbnail

Datum Marine Catalogue: Maritime & Naval Propulsion Monitoring Solutions

Datum Electronics Marine Catalogue: Featuring Torque, Thrust, and Shaft Power Measurement Products and Services for the Naval and Commercial Maritime sectors.

1 file(s) 9.87 MB
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Case Studies

FAQs

  • Datum’s range of marine shaft power meters have been designed specifically to meet the requirements of commercial marine customers to provide real time and ongoing power monitoring data on ships. With a modular design suitable for shafts of varying sizes from 150mm to over 1100mm, these maintenance-free contactless devices are extremely reliable.

  • Datum Electronics’ marine shaft power meters can be specified to work with all common supply voltage standards, for example single or triple-phase AC at 110-230V, or 12/24V DC.  They all have IP67 envioronmental sealing and can operate at a wide range of temperatures from -15 to +80 celsius

  • A typical installation and commissioning cycle takes 1-2 days and there is no further calibration required.

Technical Drawings & CAD Files

Datum Electronics Marine shaft Power Meter System 1

Datum Electronics Shaft Power Meter Drawing Pack

1 file(s) 3.15 MB
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