ABB FXL5000 Manuel De Mise En Service, D'opération Et D'entretien page 43

Air bubbles carried in the measurement medium distort the measurement result.
Fig. 7:
With a free exit (downpipe), the flowmeter should not be installed at the highest point and/or in the out-
flowing side of the piping (measurement pipe runs dry; air bubbles). Stationary turbulence (e.g. with half
open gate valve or with tangential inflow upstream of equipment) which extends into the flowmeter should
be avoided. If the fluid is displaced with the aid of pumps, then the flowmeter should be installed on the
pressure side of the pump.
In metering systems, the flowmeter should be installed in a place which ensures that both fluids are mixed
well. An inhomogenous distribution of one fluid in others should be avoided in the flowmeter. A pulsation
damper should be provided. The earthing connection between the two connectors on the converter hous-
ing should be connected to a good earthing point.
Earthing electrodes are integrated in the meter tube of the flowmeter. The meter tube and the electrodes
integrated in the meter tube come into contact with the fluid. Before starting up the equipment, check
whether the materials used are chemically resistant to the fluid to be measured. When fitting the equip-
ment, use gaskets. These must also be resistant to the fluid. Ensure that the max. fluid temperature of
110 °C is not exceeded.
Observe the max. torque to which the screw connection on the Miniflow may be tightened.
The equipment with ISO threads should be sealed with threads at its face end. The supplied O-ring should
be used for this purpose. This is made of Viton: Check the chemical resistance of this material before
fitting. Avoid using ferrous magnetic materials as process connections.
Fig. 8:
D184B112U04 FXL5000 (Miniflow)
Max. tightening torque for process connection thread
PVDF
10 – Nm
15 – Nm
25 – Nm
50 50 Nm
Face end
O-ring gasket
(ISO threads)
4 Assembly and start-up
PEEK
3 Nm
3 Nm
7 Nm
–
GB 13