Halogen’s Amperometric Total Residual Oxidants Sensor Accepted By IMO’s GESAMP


  • Halogen amperometric total residual oxidants sensor is accepted by IMO’s GESAMP subcommittee as equivalent to the traditional DPD test

The acceptance by IMO’s Joint Group of Experts on the Scientific Aspects of Marine Environment Protection (GESAMP) that Halogen’s amperometric total residual oxidants sensor is equivalent to the traditional test N, N-diethyl-p-phenylenediamine (DPD) reagent test for residual reagent in treated ballast water discharge, is a big step forward for the US manufacturer, says an article published in Riviera.

Without repeating final approval test

The acceptance opens the way for ballast water management system manufacturers to switch from DPD instruments to the reagentless halogen amperometric sensor without repeating the final approval testing.

The US Coast Guard (USCG) took a similar position in 2021. In 2022, USCG issued the first TRO substitution of Halogen’s amperometric sensor for a DPD instrument used in type-approval testing.

Online monitoring of TRO

According to Halogen Systems president Michael Silveri, “This makes the change from a DPD instrument to Halogen’s amperometric sensor straightforward.

While a case by case is required by the approval authority, repeating the initial type-approval testing is not required. With our new side stream system, a DPD Instrument can easily be retrofitted to use a Halogen amperometric sensor.”

According to IMO GESAMP STW report, “… the Group’s conclusion that it would recognise amperometric TRO sensors as practical alternatives to DPD colorimetric sensors for use in the online monitoring of TRO in future BWMS applications…”

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Source: Riviera


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