Sea Sentry - Wash Water Monitor for Ship Exhaust Gas Cleaning Systems

Ship exhaust gas emissions from marine diesel engines release harmful gases and particulate matter into the atmosphere. Of particular concern are emissions comprising of NOX, SOx and hydrocarbon particulates, together with CO2, which are detrimental to human health and the environment.  To make ships greener and prevent pollution, the IMO has established a number of new regulations to reduce emissions and continue to tighten regulations on sulphur content in marine fuel in order to reduce sulphur dioxide emissions from ships.

In 2008, the IMO also adopted the global sulphur cap which requires all ships to reduce their emissions to a maximum 0.5% sulphur content as of January 1, 2020 and by 2018 ships are required to submit monitoring data. This is expected to cost the industry an additional $60 billion annually by either switching to alternative fuels or by installing scrubber systems, which clean emissions using water. Scrubber systems, although an initial investment, are the more economical solution as they provide a 20-50% rate of return and are becoming more widely adopted.

Exhaust Gas Cleaning Systems clean emissions before release often by the use of wet scrubber systems that use wash water. It is this water that must be monitored at all times to avoid discharges that may exceed regulations and damage the environment.   CTG's Sea Sentry provides a fully autonomous wash water monitoring system - it monitors both the water inlet and outlet of wet exhaust gas scrubber systems. It is a turnkey solution which measures Polycyclic Aromatic Hydrocarbon, Absorbance, Turbidity (to ISO 7027: 1999), Temperature and pH. It is DNV.GL certified and also incorporates an integral pump, de-bubbler, pressure relief valves and a flow meter.

CTG is supplying Sea Sentry to the maritime industry’s leading providers of Exhaust Gas Cleaning Systems worldwide, providing operators with the highest level of confidence in compliance thanks to Chelsea’s unique sensor suit and unprecedented build standard.  The work we are doing by providing water quality monitors for Exhaust Gas Cleaning Systems expands our existing capabilities in the supply of in-line monitoring systems for Green Shipping Initiatives.


For more information please contact: Stephanie Lavelle

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  • Confirms wash water from ship exhaust gas cleaning systems is within regulatory limits.
  • Systems suitable for both new ship and retrofit installations.
  • Compatible with Open Loop, Closed Loop and Hybrid systems.
  • Ensures the environment is protected from contamination in exhaust gas scrubber wash water discharge.

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