Endress+Hauser Proline Prosonic Flow 91W Brief Operating Instructions page 6

Installation
Horizontal
In the recommended installation range in a horizontal installation position (View B), gas and air
collections at the pipe cover and problematic deposits at the bottom of the pipe have a smaller
influence on measurement.
Fig. 2: Orientation
A Recommended orientation with upward direction of flow
B Recommended installation range with horizontal orientation
C Recommended installation range max. 120°
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A C
B
Proline Prosonic Flow 91W
C
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Endress+Hauser