Onboard testing confirms suitability for continuous direct CO₂ measurement within EU MRV Method D reporting frameworks.

Based on onboard testing and independent technical review, DNV issued a Statement of Compliance stating that Daphne Technology’s PureMetrics™ was assessed and found suitable for direct CO₂ measurement under EU MRV Regulation 2015/757  and MEPC.395.

The validation demonstrates suitability for use within Method D direct emissions reporting frameworks, subject to vessel-specific implementation and verifier acceptance.

Adoption of Method D has remained limited in practice, due to challenges associated with accurate measurement under variable exhaust conditions, onboard calibration and data traceability, and data integrity requirements. PureMetrics addresses these through adaptive sensor compensation, automated audit-ready calibration logs, and a secured cloud pipeline with direct verifier access.

As emissions reporting increasingly drives financial exposure under EU Emissions Trading System (EU ETS) and FuelEU Maritime, confidence in emissions data quality becomes commercially material.

DNV’s validation covered the PureMetrics™ measurement approach, system design, and validation methodology, based on onboard testing under real operating conditions aboard a commercially operating dual-fuel vessel. The assessment confirmed the system’s suitability as a basis for Method D reporting under defined conditions, subject to incorporation into an approved monitoring plan and vessel-specific verifier acceptance in accordance with EU MRV 2015/757. The validation included operational testing, calibration methodology review, exhaust gas flow determination, and comparison against fuel-consumption-derived reference emissions data.

PureMetrics™ provides direct, real-time measurement of CO₂, methane, and other exhaust gases. While the current DNV assessment focused on CO₂ measurement, the platform is designed for broader continuous GHG monitoring. Methane and nitrous oxide, included in EU MRV reporting from 2024, require separate validation. Daphne Technology is progressing work toward dedicated methane measurement validation and associated regulatory acceptance pathways.

“Direct measurement has seen limited adoption partly because the path from technical readiness to regulatory acceptance has been unclear,” said Ivan Raleff, Managing Director of Daphne Technology SA, Switzerland. “The DNV Statement of Compliance provides operators and verifiers with a technically reviewed reference point for implementing Method D reporting.”

Under current practice, most vessels report CO₂ emissions using fuel-based calculation methods, deriving figures from bunker delivery notes and applying standard emission factors. These methods carry inherent uncertainty, particularly for dual-fuel vessels where combustion efficiency and fuel composition can vary. Direct measurement quantifies actual emissions at source, and where integrated into an approved monitoring plan, can provide a more defensible basis for regulatory reporting. For operators managing EU ETS allowance costs, the difference between estimated and measured emissions figures has a direct financial dimension.

The validation comes at a time when the stakes of emissions data quality are increasing across multiple dimensions. Shipowners are required to surrender EU ETS allowances corresponding to verified CO₂ emissions, making the accuracy and defensibility of emissions data a direct cost factor. FuelEU Maritime, in force from 2025, adds further requirements around data transparency and traceability. Regulators, verifiers, and charterers are all placing greater emphasis on the robustness and traceability of reported emissions data.

Daphne Technology and DNV are continuing to work together on digital data transfer through the DNV Veracity platform, including API integration to support end-to-end reporting workflows for operators adopting Method D.

PureMetrics^TM is a continuous emissions monitoring system for marine vessels, 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.