Liquid Measuring Media - ABB CoriolisMaster FCH400 Series Operating Instructions Manual

32 CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E
... 6 Installation
... General installation conditions

Liquid measuring media

Observe the following points to avoid measuring errors:
• The meter tubes must always be completely filled with
the measuring medium.
• The gases dissolved in the measuring medium must not
leak out. To safeguard this, a minimum back pressure of
0.2 bar (2.9 psi) is recommended.
• The minimum vapor pressure of the measuring medium
must be maintained when there is negative pressure in
the meter tube or when liquids are gently simmering.
• During operation, there must be no phase transitions in
the measuring medium.
Vertical installation
A
1 Supply tank
2 Sensor
3 Piping constriction / orifice
Figure 9: Vertical installation
B
1
2
3
4
5
G11607
4 Turn-off device
5 Filling tank
For vertical installation in a riser, no special measures are
A
required.
For vertical installation in a downpipe, a piping constriction
B
or an orifice must be installed below the sensor. Doing this
prevents the sensor from draining during the measurement.
Horizontal installation
A
B
Figure 10: Horizontal installation
For liquid measuring media and horizontal installation, the
A
transmitter and terminal box must point upward. If a self-
draining installation is required, the sensor must be mounted
at an incline of ≥ 30°.
Installing the sensor at the highest point of the piping leads
B
to an increased number of measuring errors due to the
accumulation of air or the formation of gas bubbles in the
meter tube.
≥ 30°
G11608-01