Lloyd’s Register (LR) has issued a factual statement confirming that Daphne Technology’s PureMetrics continuous emissions monitoring system has been assessed and found suitable as a direct continuous emission monitoring system (CEMS) for selected GHG emissions from marine diesel engines onboard ships.
The assessment is based on reviewed documentation and onboard demonstration tests and includes LR design appraisal of the PureMetrics system configuration and its associated emissions calculation methodology. Unlike vessel-specific validations, the LR assessment is a generic design appraisal, confirming that the PureMetrics system design and methodology meet the applicable requirements independent of a specific ship installation. This enables shipowners and operators to reference the appraisal as a technical foundation when integrating PureMetrics into ship-specific monitoring plans and certification processes.
The appraisal confirmed that PureMetrics is designed to monitor CO₂ and methane, as well as CO, NO, NO2, and SO2, all of which fall within the reviewed system scope. The system is designed for installation on marine diesel and dual-fuel engines, reflecting the operational profile of LNG-fuelled vessels where methane slip is a primary emissions consideration. The assessment covered the full system configuration, including the gas analyser, water content measurement device, sample gas conditioning system, exhaust gas flowmeter, temperature and pressure transmitters, IoT panel and PureMetrics hub dashboard. In addition, the emissions calculation methodology developed by Daphne Technology, based on UN TOOL08, was separately appraised and confirmed acceptable as a basis for emissions calculations.
The assessment took into account IMO Resolution MEPC.395(82), EU MRV Regulation 2015/757 Annex I Method D, the NOx Technical Code 2008, and UN TOOL08. Additionally, based on Lloyd’s Register’s understanding of IMO Resolution MEPC.416(84), the guidelines for CEMS used to quantify emissions from marine diesel engines. The PureMetrics technical manual can be further developed into a ship-specific CEMS file for certification purposes where the system is intended for installation and statutory use on a specific vessel, subject to the applicable ship-specific survey and certification process by the relevant flag administration.
Max Wu, LR Lead Specialist, Engine and Emissions Certification Service, said: “Although IMO and EU frameworks recognised CEMS as a method for measuring greenhouse gas emissions from engines, LR and Daphne Technology began this appraisal before specific statutory guidelines were available. As Daphne progressed its application, LR provided technical input while also contributing to the IMO correspondence group during the development of the CEMS Guidelines, which were adopted at MEPC 84. The timely adoption of these guidelines gives stakeholders clearer direction on CEMS approval and supports CEMS as a practical method for monitoring and quantifying greenhouse gas emissions from marine engines.”
Ivan Raleff, Daphne Technology MD, added: “Receiving the Lloyd’s Register factual statement marks another step in the independent validation of PureMetrics as a credible basis for direct emissions reporting. Just weeks after the DNV statement of compliance, the appraisal from Lloyd’s Register broadens the regulatory foundation for PureMetrics and confirms that the system’s design and methodology meet applicable requirements across a wider scope of greenhouse gases.”
The LR factual statement confirmed PureMetrics suitability for direct CO₂ measurement under EU MRV Method D on a specific reference vessel. Together with the DNV statement of compliance received in April 2026, the two independent validations from major class societies provide a broadening technical foundation for operators seeking to adopt direct emissions measurement as a reporting basis. The broader gas scope of the LR appraisal is particularly relevant as regulatory frameworks evolve. Methane is now included within EU MRV reporting from 2024, and its inclusion rate under the EU ETS increases to 100% in 2026. For operators of dual-fuel vessels, accurate methane measurement is becoming a direct compliance and cost consideration.
Daphne Technology and LR conducted the appraisal process in circumstances where no specific statutory guidelines for CEMS on marine diesel engines existed at the outset of the project. LR provided professional guidance and technical direction throughout, enabling a rigorous assessment framework to be developed based on available regulatory references, and to establish approaches where established guidelines did not yet exist. The close cooperation between LR and Daphne Technology throughout the appraisal process was central to its successful completion. IMO Resolution MEPC.416(84), the first dedicated IMO guideline for CEMS on marine diesel engines, was adopted in May 2026 during the course of the appraisal. The Factual Statement references MEPC.416(84) as the pathway for further development toward ship-specific CEMS certification.
PureMetrics is a continuous emissions monitoring system, providing real-time exhaust gas data for regulatory reporting and emissions transparency. It is part of Daphne Technology’s product portfolio alongside SlipPure, the company’s plasma-catalytic methane abatement system for gas engines.
Image: Ivan Raleff, MD Daphne Technology (source: Daphne Technology)
