Details

Autor(en) / Beteiligte

• Shan, Guilin
• Sun, Yurui
• Li, Menghua
• Jungbluth, Kerstin H
• Maack, Christian
• Buescher, Wolfgang
• Schütt, Kai-Benjamin
• Boeker, Peter
• Lammers, Peter Schulze
• Zhou, Haiyang
• Cheng, Qiang
• Ma, Daokun

Titel

An Assessment of Three Different In Situ Oxygen Sensors for Monitoring Silage Production and Storage

Ist Teil von

• Sensors (Basel, Switzerland), 2016-01, Vol.16 (1), p.91

Ort / Verlag

Switzerland: MDPI AG

Erscheinungsjahr

2016

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Oxygen (O₂) concentration inside the substrate is an important measurement for silage-research and-practical management. In the laboratory gas chromatography is commonly employed for O₂ measurement. Among sensor-based techniques, accurate and reliable in situ measurement is rare because of high levels of carbon dioxide (CO₂) generated by the introduction of O₂ in the silage. The presented study focused on assessing three types of commercial O₂ sensors, including Clark oxygen electrodes (COE), galvanic oxygen cell (GOC) sensors and the Dräger chip measurement system (DCMS). Laboratory cross calibration of O₂ versus CO₂ (each 0-15 vol.%) was made for the COE and the GOC sensors. All calibration results verified that O₂ measurements for both sensors were insensitive to CO₂. For the O₂ in situ measurement in silage, all O₂ sensors were first tested in two sealed barrels (diameter 35.7 cm; height: 60 cm) to monitor the O₂ depletion with respect to the ensiling process (Test-A). The second test (Test-B) simulated the silage unloading process by recording the O₂ penetration dynamics in three additional barrels, two covered by dry ice (0.6 kg or 1.2 kg of each) on the top surface and one without. Based on a general comparison of the experimental data, we conclude that each of these in situ sensor monitoring techniques for O₂ concentration in silage exhibit individual advantages and limitations.