Siemens SITRANS FC410, Руководство по эксплуатации, Страница: 31 / 160

Installing/Mounting
4.1 Flowmeter installation
FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
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Upstream / downstream
● No pipe run requirements, that is straight inlet/outlet sections are not necessary.
● Avoid long drop lines downstream from the sensor to prevent process media separation
causing air / vapour 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.
Image 4-1 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.
Image 4-2 Gas applications, wrong location with trapped oil
4.1.3 Orientation of the device
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 the accuracy of the sensor do not
change with reverse flow.