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LEMAG - Engine Performance Analysis

Optimizing Performance & Reducing Emissions

LEMAG LEHMANN & MICHELS has manufactured performance measuring instruments for the marine industry since 1911. Today’s product range includes state-of-the-art systems to monitor engine efficiency.

The market-leading LEMAG PREMET® system enables measurement of the power produced inside the cylinder and the LEMAG Shaftpower® system permanently monitors the effective power transmitted to the propeller. The latest addition is the LEMAG SEEAmag® Ship Energy Efficiency Analyzer which measures, records and analyzes key data to help evaluate total ship performance.

LEMAG LEHMANN & MICHELS also specializes in fuel systems. These systems include LEMAG CONTROLmag®, automatic control in fuel change-over systems, the type-approved LEMAG®FQI homogenizer for fuel quality improvement and the LEMAG Slashpol® E water-in-fuel emulsifier for NOx reduction.

LEMAG PREMET® - Engine Performance Monitoring


PREMET® electronic indicators are designed and manufactured for diesel and gas applications in the marine market and mobile / stationary power stations. These systems are designed for use with heavy fuel oil.

  • High resolution color display
  • All curves and diagrams displayed immediately
  • Large memory for thousands of measurements
  • Self-explanatory user interface

Real-time measurements are possible without stopping the engine to install sensors.

PREMET® C-XL MIPThe PREMET® C-XL MIP measuring system is an extremely robust and simple handheld instrument. This unit displays the course of pressure directly after a measurement has been taken and can store hundreds of measurements along with related engine data. The PREMET® product range includes online systems that enable 24/7 cylinder pressure monitoring.

LEMAG Shaftpower® and SEEAmag® - Ship Performance Monitoring

LEMAG Shaftpower® and SEEAmag® - Ship Performance Monitoring

LEMAG Shaftpower® is a permanently installed power measuring system that measures the actual power output of a ship’s propulsion engine.

LEMAG SEEAmag® monitors the shaftpower, fuel consumption and further key data to enable in-depth analysis and fleet comparisons. The system also constantly analyzes KPIs i.e. M/E, trim, hull or T/C efficiency and displays the results in green, yellow or red for a fast overview.

LEMAG Slashpol® - Emission Reducing Technologies

LEMAG Slashpol® E

The LEMAG Slashpol® E can reduce NOx and particle emissions by adding water to the fuel oil. The emulsifier creates a homogeneous water-in-fuel emulsion with an average droplet size of approx. 5 µm, which enables emissions to be reduced across the engine’s operating range. To ensure the LEMAG Slashpol® E reaches its maximum potential, tests are run in the LEMAG laboratory using many different types of fuels and emulsions.

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Product Range

  • LEMAG Shaftpower®

    LEMAG Shaftpower
    • Touch screen operated
    • Contact-free sensors
    • Easy to operate
    pdf download
  • LEMAG SEEAmag®

    • Measures, records and analyzes performance and navigational data
    • Valuable SEEMP tool
    pdf download
  • LEMAG LUBEmag®

    • Reliable and safe operation
    • Touch screen operated
    pdf download

    • Automatic and controlled change-over from HFO to DFO
    • Tamper-proof data logger
    pdf download
  • LEMAG Slashpol® E

    LEMAG Slashpol E
    • Improved combustion quality
    • Low operational costs
    • Integrated safety system
    pdf download

    • For fuel quality improvement
    • Sealed by magnetic coupling
    pdf download
  • LEMAG PREMET® online

    LEMAG PREMET online
    • A permanently installed system to control motor performance
    • For diesel and gas engines
    pdf download

    • High resolution color display
    • Self-explanatory user interface
    pdf download
  • LEMAG Indicator Valves

    LEMAG Indicator Valves
    • Correct and reliable connection of the indicator to the engine
    • Two-part spring loaded spindles or alternatively with servo-operated spindle

LEMAG Spare Parts and Factory-approved LEMAG Service

  • LEMAG Spare Parts

    • Dedicated LEMAG Team of Specialists
    • Close Partnership with LEMAG with full access to the supply chain
    • Extensive LEMAG spare parts inventory
    • Competitive pricing and minimal turnaround times
  • LEMAG Spare Parts

    LEMAG Spare Parts

    Find out more about our extensive spare parts inventory.


  • Factory-approved LEMAG Service

    • Short turnaround times for emergency service in the Americas
    • Factory-trained and experienced technicians
    • Installation of complete units
    • Retrofits and upgrades of existing equipment
  • LEMAG Service

    LEMAG Service

    Find out more about our engine and auxiliary services.