UV500 IMO Online Water Analyser

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On Site Calibration

Remote Cloud Monitoring

UV500 IMO Online Water Analyser


In regards of the new regulations defined by IMO (international Maritime Organization) in 2020, ships must continuously control their emissions from fuel oil combustion. Global Sulphur content shall not exceed 0.5 % in ships’ fuel oil unless an exhaust gas cleaning (EGC) system is provided. The wash water resulting from the cleaning of the scrubber used to reduce the amount of pollutants in the exhaust stream is also subjected to regulations as it is discharge into the open sea. Discharge water must be effectively monitored before returning to the sea in order to limit its impact on marine ecosystems or environment. The MEPC 259(68) standards give specific criteria for water quality parameters.
  • Fully compliant to MEPC 259 (68)
  • Compact system
  • User-friendly interface
  • Multiplexing
  • Compact system
  • User-friendly interface 

UV500 IMO Measurement Principle

  • UV500 IMO manufactured by Tethys Instruments is a specific on-line water analyser which provides a simple and fast method to measure PAH (Polycyclic Aromatic Hydrocarbons), pH, turbidity, and temperature using different modules. This analyser is designed to monitor inlet or outlet washwater of exhaust gas cleaning system with good accuracy, stability, and low operating cost. UV500 IMO can also be easily applied for open-loop, closed-loop or hybrid scrubber. The analyser is fully compliant with the MEPC 259(68) discharge criteria.
  • An UV-fluorescence module allows the measurement of PAH in terms of equivalent concentration of phenanthrene(PAHpheeq). Infra-red laser diode is used to monitor turbidity by nephelometry. Internal probes allow to monitor pH and temperature.
  • Thanks to its automatic cleaning system, the maintenance is roughly limited to a periodic refill of the inexpensive cleaning solution.
  • All the measurements are done within 5 seconds.
  • The UV source used for PAH measurement is xenon flash lamp specified for 109 flashes that corresponds to more than 10 years of lifetime with one measurements every minute.
  • The infrared laser diode employed for turbidity complies with the ISO 7027:1999 standards.


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