4.2.2 Sensor installation
4.2.2.1 Determining a location
CAUTION
Electromagnetic fields
Do not install the flowmeter in the vicinity of strong electromagnetic fields, for example near
motors, variable frequency drives, transformers etc.
Upstream / downstream
● No pipe run requirements, that is straight inlet/outlet sections, are necessary.
● Avoid long drop lines downstream from the sensor to prevent process media separation
causing air / vapor bubbles in the tube (min. back pressure: 0.2 bar).
● Avoid installing the flowmeter immediately upstream of a free discharge in a drop line.
Location in the system
The optimum location in the system depends on the application:
● Liquid applications
Gas or vapor bubbles in the fluid may result in erroneous measurements, particularly in the
density measurement.
– Do not install the flowmeter at the highest point in the system, where bubbles will be
trapped.
– Install the flowmeter in low pipeline sections, at the bottom of a U-section in the pipeline.
Figure 4-2 Liquid applications, wrong location with trapped air/gas
● Gas applications
Vapor condensation or oil traces in the gas may result in erroneous measurements.
– Do not install the flowmeter at the lowest point of the system.
– Install a filter.
Figure 4-3 Gas applications, wrong location with trapped oil
Installing/mounting
4.2 Installation instructions
SITRANS FC330
Operating Instructions, 01/2019, A5E44030648-AB 49
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