DNV has issued a Statement of Compliance for Daphne Technology's PureMetrics™, confirming its suitability for direct CO2 measurement under the EU MRV Regulation 2015/757 (Method D) and MEPC.395(82).
Following onboard testing and a thorough independent technical review, the statement indicates that PureMetrics™ meets the requirements for direct emissions reporting, pending specific vessel implementation and verification acceptance.
Overcoming compliance challenges
The adoption of Method D for emissions reporting has faced obstacles such as variable exhaust conditions and the complexity of onboard calibration. PureMetrics™ addresses these issues by employing adaptive sensor compensation, automated calibration logs ready for audit, and a secure cloud system that allows verifiers direct access, thus enhancing data integrity and traceability.
The validation conducted by DNV evaluated the PureMetrics™ system design, methodology, and its performance under real operating conditions aboard a dual-fuel commercial vessel. The assessment confirmed the system's compliance with Method D when integrated into an approved monitoring plan and accepted by a verifier, as specified in EU MRV 2015/757.
Real-time monitoring capabilities
PureMetrics™ offers direct and real-time monitoring of CO2, methane, and other exhaust gases
PureMetrics™ offers direct and real-time monitoring of CO2, methane, and other exhaust gases. Although the recent DNV assessment concentrated on CO2, the system is intended for comprehensive greenhouse gas (GHG) monitoring. Methane and nitrous oxide will require additional validation for EU MRV reporting by 2024. Daphne Technology is working towards validation for methane measurement and regulatory acceptance.
Most vessels currently use fuel-based calculations for CO2 emissions reporting, which can lead to inaccuracies, especially in dual-fuel vessels. Direct measurement, as offered by PureMetrics™, could provide a more reliable basis for regulatory reporting, affecting costs related to EU Emissions Trading System (EU ETS) allowances. Ivan Raleff, Managing Director of Daphne Technology SA, remarked that the DNV Statement of Compliance offers a reference point for implementing Method D reporting.
Ensuring robust data reporting
The importance of accurate emissions data is increasing, with shipowners needing to match EU ETS allowances to verified CO2 emissions. The accuracy of this data determines direct cost and compliance outcomes. Upcoming regulations such as FuelEU Maritime in 2025 will demand enhanced data transparency and traceability.
DNV and Daphne Technology continue to enhance digital data transfers via the DNV Veracity platform, including incorporating API integration, to streamline end-to-end Method D reporting workflows. PureMetrics™ is central to Daphne Technology's portfolio, which also includes SlipPure, a plasma-catalytic methane abatement system for gas engines.
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 (Method D) and MEPC.395(82).
The validation demonstrates suitability for use within Method D direct emissions reporting frameworks, subject to vessel-specific implementation and verifier acceptance.
Vessel-specific implementation
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.
Real operating conditions
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.
Continuous GHG monitoring
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."
Direct financial dimension
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.
Defensibility of emissions data
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.
Emissions monitoring system
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™ 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.
