Hach US9001 Manuel D'utilisation page 11

Most primary devices have a specific place for the head (liquid level) measurement sensor. Refer to
the instructions supplied by the primary device manufacturer for the correct sensor location. When
instructions are not available from the primary device manufacturer, refer to Figure 9–Figure 13. The
symbol in the figures identifies the correct sensor location.
To prevent the sensor from going under water but still have the sensor at the best distance, mount
the sensor at the minimum range of the sensor above the typical maximum level of the target. Make
sure to be within the maximum range of the sensor and take the minimum level of the target into
consideration.
Figure 9 V-notch weir
English 11