KROHNE AQUAFLUX EN - Manual (Page 5)

5
• Strong electromagnetic fields, avoid in vicinity of flowmeter
• Straight inlet run minimum of 5
××
DN and outlet run minimum of 2
××
DN,
(DN = meter size), measured from the electrode axis.
• Vortex and corkscrew flow: increase length of inlet and outlet runs or install
flow conditioners.
• Mixing different process liquids: install flowmeter upstream of mixing point or at an
adequate distance downstream (minimum of 30
×
DN), otherwise display may be unsteady.
• Plastic pipes and internally coated metal pipelines: grounding rings required,
see Section 7 ”Grounding”.
• Insulated pipeline: do not insulate flowmeter
• Zero setting not necessary. To check, it should be possible to set ”zero” flow velocity
in the completely filled measuring tube. Shutoff valves should therefore be provided
either downstream of the flowmeter or upstream and downstream of the flowmeter.
Highest point of pipe run
(Air bubbles collect in measuring
tube - faulty measurements!)
Preferred
locations
Downpipe
”Zero” flow
velocity.
Line drained.
Faulty
measurements!
Horizontal pipe run
Install in slightly ascending pipe section. If not
possible, assure adequate velocity to prevent air,
gas or vapor from collecting in
uppper part of flow tube.
Open feed or discharge
Install meter in low section of pipe.
open discharge
Long pipeline
Always install control and shutoff valves
downstream of flowmeter.
Pumps
Never install flowmeter on pump suction side.
> 5m > 16 ft
2 Suggestions for installation
To avoid measuring errors due to gas/air inclusion or to pipe running empty, please observe the
following:
Downpipe over 5 m (16 ft) length
Install air valve X downstream of
flowmeter.