15
D-546-9-E
5.7 Prevention of Slug Flow
This meter can measure both gases and liquids, but slug flows (where gases exist in the process liquid) will
produce a loss of metering accuracy.
5.8 Partially Filled Pipe
When making a liquid measurement, ensure that the piping remains full of the process liquid. Installation in
locations where it is difficult to keep the piping filled with the process liquid, or where bubbles tend to collect
should be avoided.
5.9 Bypass Line
For maintenance and servicing purposes, it is a good
practice to provide a bypass line. Valves upstream
and downstream of the meter should be of a design
which will not disturb fluid flow pattern, such as ball
valves (full bore type), in this arrangement (see Fig.
5.4).
For general considerations to be observed, refer to
JIS Z 8766, “Flowrate Measurement Methods with
Vortex Shedding Flowmeters.”
6. INSTALLATION
6.1 Installation Location
Select a location with ambient temperatures -20 to +60℃. Installation in such locations as described below
should be avoided:
① Hardly accessible for maintenance and servicing
② Temperature change and/or vibration is excessive
③ Possible immersion in water
④ Corrosive atmosphere
⑤ Unfit for the meter’s explosionproof construction
6.2 Physical Orientation
This meter may be installed either on a horizontal or vertical run. Avoid, however, such physical orientation as:
① Inconvenient for inspection and maintenance
② Rainwater is ready to enter from cable entry (if
installed outdoors)
Fig.6.1 Installed upside down
Fig.6.2 Cable entry pointed upward
