How to identify false readings of exhaust monitoring equipment


Introduction


Malfunctions of SOx scrubbers or exhaust gas cleaning systems (EGCSs) that last more than one hour should be reported to the flag administration and the relevant port state administration. However, sometimes a malfunction may go undetected because the monitoring equipment does not register any increase in SO2 concentration. Often, the cause of false measurement readings is poor maintenance.


Since crew members are not experts in SO2/CO2 emissions monitoring systems, they may struggle to correctly interpret measurement signals and analyzer readings. The following guidance aims to enhance understanding and build confidence in making the right decisions when faced with suspicious measurement results.


70 | ISSUE 111 | MAR 2025 | THE REPORT


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An increasing number of vessels have encountered unexpected port state issues related to sulphur emissions limit exceedance caused by inaccurate readings. These false measurement readings are often the result of poorly maintained exhaust gas analyzers. This technical news emphasizes the importance of calibration and maintenance routines, and of monitoring equipment performance.


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