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4.6.5
Difficult installation locations for liquid
measurement
The accumulation of air or gas bubbles in the meter tube will
lead to increased inaccuracies.
Avoid the following installation locations in case of liquid
measurement:
Fig. 10: Difficult installation locations
— "A": Installing the flowmeter sensor at the highest point of
a pipeline leads to increased inaccuracies due to the
accumulation of air or gas bubbles in the meter tube.
— "B": Installing the flowmeter sensor in a drop line means
that there is no guarantee that the meter tube will be
completely full while measurements are being taken and
leads to increased inaccuracies.
4.6.6
Difficult installation locations and gas metering
When metering gas, the accumulation of fluid or the formation
of condensate in the meter tube will lead to increased
inaccuracies.
Avoid the following installation locations when metering gas:
Fig. 11: Difficult installation locations
Installing the flowmeter sensor at the lowest point of a pipeline
leads to increased inaccuracies due to the accumulation of
fluid or the formation of condensate in the meter tube.
18 CI/FCB300/FCH300-EN Rev. F | CoriolisMaster FCB330, FCB350, FCH330, FCH350
4.6.7
Zero balance
CoriolisMaster flowmeters do not require in any case a zero
point calibration. Only under these circumstances a calibration
is recommended:
— when measuring below 10% of QmaxDN,
— when very high accuracies are required (0.1% or better),
— the operating conditions (pressure and temperature) differ
widely from the reference conditions.
Fig. 12: Bypass line
Closing valves are to be installed in front (A) and after (B) the
flowmeter.
We recommend installing a bypass line. Installing a bypass line
means that adjustment can take place while the process is
ongoing.
Before adjusting the zero under operating conditions, make
sure that:
— The meter tube is completely full
— There are no gas bubbles or air in the meter tube (in case
of liquid measurements)
— There are no condensates in the meter tube (in case of
gas measurements)
— The pressure and temperature in the meter tube are
appropriate for normal operating conditions
In case of a high zero point (> 0.1%) please check the
installation for best praxis and ensure that there are no gas
contents in a liquid or solids or liquids in gases. Please ensure
that the meter is completely filled.
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