Vaisala Polaris PR53AC Guide D'installation page 18

4. Install flow cell using clamps.
a. Finger tighten to 3 Nm if you are using the clamp with one tightening screw.
b. Tighten to 28 Nm with 9/16" wrench if you are using the sanitary clamp with two
tightening screws.
18 M212866EN-D