Gaseous Measuring Media; Turn-Off Devices For The Zero Point Adjustment - ABB CoriolisMaster FCH400 Series Operating Instructions Manual

CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E

Gaseous measuring media

Observe the following points to avoid measuring errors:
• Gases must be dry and free of liquids and condensates.
• Avoid the accumulation of liquids and the formation of
condensate in the meter tube.
• During operation, there must be no phase transitions in
the measuring medium.
If there is a risk of condensate formation when using gaseous
measuring media, note the following:
Ensure that condensates cannot accumulate in front of the
sensor.
If this cannot be avoided, we recommend that the sensor is
installed vertically with a downward flow direction.
Vertical installation
For vertical installation, no special measures are required.
Horizontal installation
A
B
Figure 11: Horizontal installation
For gaseous measuring media and horizontal installation, the
A
transmitter and terminal box must point downward.
Installing the sensor at the lowest point of the piping leads
B
to an increased number of measuring errors due to the
accumulation of liquid or the formation of condensates in
the meter tube.
Turn-off devices for the zero point
adjustment
A
B
1 Turn-off device
Figure 12: Mounting options for turn-off devices (example)
To guarantee the conditions for zero point balancing under
operating conditions, turn-off devices are required in the piping:
At least on the outlet side when the transmitter is
A
mounted in horizontal position
At least on the inlet side when the transmitter is mounted
B
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in vertical position.
In order to perform balancing during an ongoing process,
C
it is advisable to mount a bypass pipe.
1
C
33
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