GALU-209FYSkusungunuka kwa oxygen sensoramagwiritsa ntchito muyeso wa fluorescence wa okosijeni wosungunuka, kuwala kwa buluu komwe kumapangidwa ndi phosphor wosanjikiza, chinthu cha fulorosenti chimasangalala kutulutsa kuwala kofiira, ndipo chinthu cha fulorosenti ndi kuchuluka kwa okosijeni zimayenderana ndi nthawi yobwerera ku nthaka.Njirayi imagwiritsa ntchito muyeso wampweya wosungunuka, palibe kuyeza kwa oxygen, deta ndi yokhazikika, yodalirika, palibe kusokoneza, kuyika ndi kuwerengetsa kosavuta.Amagwiritsidwa ntchito kwambiri m'mafakitale ochizira zimbudzi chilichonse, zomera zamadzi, madzi apamwamba, kupanga mafakitale amadzi opangira madzi ndi kuyeretsa madzi otayira, ulimi wamadzi ndi mafakitale ena pa intaneti kuyang'anira DO.