Assembly And Start-Up; Installation Conditions - ABB FXL5000 Manuel De Mise En Service, D'opération Et D'entretien

4

Assembly and start-up

4.1
The flowmeter should not be installed close to electromagnetic fields. Any installation position is possible!
When installing, always ensure that the measurement pipe is filled completely. Partial filling causes mea-
surement errors. The Miniflow measures in both directions of flow! The forwards direction is defined by
the arrow stuck onto the equipment. If the equipment is only operated in one direction of flow, then a
straight entry length of 3 x DN should be observed upstream of the equipment and an exit length of 2 x DN
downstream of the equipment. If it is operated in both directions of flow, then a pipe length of 3 x DN
should be observed upstream and downstream of the equipment.
Fig. 4:
Valves or other shut-off devices should be fitted downstream of the flowmeter so that it cannot run dry. A
slight rise in the piping of approx. 3 % is useful for degassing.
Fig. 5:
Installation in vertical piping is ideal, if the measuring agent is pumped from the bottom to the top. Instal-
lation in what are commonly referred to as downpipes, i.e. flow from top to bottom, should be avoided
because experience has shown that with such installations complete pipe filling cannot be guaranteed
because an equilibrium sets in between the gas pushing upwards and the fluid flowing downwards. The
primary should usually be fitted in the piping so that the Pg screw connections face downwards. If in-
stalled in horizontal piping, ensure that the intended connection line to the two electrodes is as horizontal
as possible so that no air or gas bubbles can influence the measurement voltage which is recorded by
the electrodes. The position of the electrode axis can be seen from the figure below.
Fig. 6:
GB 12 FXL5000 (Miniflow)

Installation conditions

2 x DN
Electrode
axis
4 Assembly and start-up
3 x DN
D184B112U04