Orientation Of The Sensor - Siemens SITRANS F Operating Instructions Manual

Installing/mounting
4.3 Sensor installation
Location in the system
The optimum location in the system depends on the application:
● Liquid applications
● Gas applications
4.3.3

Orientation of the sensor

Flow direction
The calibrated flow direction is indicated by the arrow on the sensor. Flow in this direction
will be indicated as positive by default. The sensitivity and accuracy of the sensor is identical
with reverse flow.
The indicated flow direction (positive/ negative) is configurable.
The sensor must always be completely filled with process media in order to measure
accurately.
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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 4-1 Liquid applications, wrong location with trapped air/gas
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 4-2 Gas applications, wrong location with trapped oil
CAUTION
SITRANS FC430 with HART
Operating Instructions, 03/2012, A5E03361511-01