Precautions
Avoid installation at the highest point in the system because air bubbles will be trapped in the
flowmeter.
Avoid installation at a point where there is a free outlet after the flowmeter.
The flowmeter pipe section may be installed in either a horizontal or vertical position.
Note
To obtain maximum battery lifetime of the Lithium Thionyl Chloride battery pack, Siemens
recommends installing the flowmeter transmitter in an upright position.
4.2.2 Reduction
Installation in large pipes
The flowmeter can be installed between two reducers as shown. At 8° reducing angles the
below pressure drop curve applies.
Delta-P example:
A water flow velocity of 3 m/s (V) in a sensor with a diameter reduction from DN 200 to DN 100
(D
1
/D
2
= 0.5) gives a pressure drop of 9 mbar.
L2: Min. 10 x pipe diameter
Installing/Mounting
4.2 Sensor installation
SITRANS FUS380/FUE380
Operating Instructions, 05/2018, A5E00730100-AE 27
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