Pilot Installation of the IFF Nitro System at MOWI Hellur, Faroe Islands

Verification of Measurement Accuracy in Real-World Conditions

The primary challenge was to test the accuracy and responsiveness of the IFF Nitro system in measuring critical water parameters, including Total Dissolved Gas Pressure (TDGP), Oxygen (O₂), Carbon Dioxide (CO₂), Nitrogen (N₂), pH, and Oxidation-Reduction Potential (ORP). Additionally, the system’s sensor regeneration capabilities and resilience to biofouling under farm conditions required evaluation. The installation also involved testing the clogging rate of the 50μm filter and integrating the system with the farm’s existing control setup.

Accurate Measurements and Operational Stability

The system’s sensor array met all performance expectations, achieving precise and fast measurements of TDGP, O₂, CO₂, N₂, pH, and ORP. Initial sensor regeneration intervals were set to 24 hours but were optimized to 72 hours based on system performance, with no deviations detected.

Ammonia Experiment

An experiment to calculate ammonia concentration from nitrogen dynamics demonstrated the system’s advanced analytical capabilities:

• The measurement loop was sealed with biologically active water, including residual ammonia.

• Over 60 hours, O₂ levels dropped to zero, and N₂ content increased by 1.5 mg/L, stabilizing thereafter.

• Using stoichiometric equations, the ammonia content was calculated at 1.94 mg/L NH₄⁺, with a measured value of 1.83 mg/L NH₄⁺, showing a 6% deviation.

• Subsequent laboratory tests revealed that this deviation could be minimized by including ammonia in the nitrogen calculations, reducing discrepancies to less than 1%.