Hach TPM870 Manuel D'utilisation page 14

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Remove the turbidimeter cover (9) as described in the turbidimeter
User's Manual.
Install the turbidity cell (6) in the sample compartment of the
turbidimeter. Fix the 3 cell tubings by pressing them into the slots
provided.
Cover the cell with the cell light cover (8).
8
6
9
TPM870 14