D3.2 Lab scale Raman test report

As part of the DELYCIOUS project, a Raman gas analyser prototype was developed and calibrated usingcertified gas mixtures to ensure accurate detection of hydrogen (H₂), oxygen (O₂), nitrogen (N₂), andwater vapor (H₂O). Calibration was performed with Horiba’s Astra H2 software, which enables intuitiveworkflow setup and recalibration using minimal amount of reference gases.Each gas was calibrated using at least two reference points for a full-scale measurement (0 to 100%).This method ensures reliable performance and easy recalibration at client sites.Key results:• The analyser accurately measured dry and humid gas mixtures with a limit of detection (LOD)of 1% and with acquisition times optimized at 3–4 seconds.• In humid mixtures, the analyser successfully identified water vapor peaks and quantified concentrationsof gas matrix. Raman gas analyser prototype is not compatible with liquid water;hence, it needs to be removed from the gas stream before the measurements.• The system supports both quantitative and qualitative gas detection, including low concentrationcomponents below 1%. Quantitative measurement allows for monitoring the concentrationdynamics in the framework of manipulations with electrolysers. Qualitative measurementgives additional information about the composition of the gas matrix which could be crucial todetect; Indeed, contaminants and undesirable chemical components can potentially deterioratethe stack.