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Explanation: After googling, I hvn't find any result about "cellule de présence". Though I think it's referred to a kind of photoelectric cell to detect the presence of two products (referred to parts) which is just what the system is to verify.
le basculeur = 2-position relay
l’intermédiaire des cellules de présence pièce sur le basculeur = the intermediary of the part presence detecting (photoelectric) cells on the 2-position relay.
According to the context followed, we can see that, with the installation, there are 2 presence detecting (photoelectric) cells on each relay.
Hope it's helpful enough...
Adsion Canada Local time: 15:25 Specializes in field Native speaker of: Chinese