KROHNE VARIFLUX 6000 EN User Manual
Page 5
Installation instructions VARIFLUX 6000
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.
• 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.
2
Suggestions for installation
To avoid measuring errors due to gas/air inclusion or to pipe running empty, please observe the
following:
Highest point of pipe run
Downpipe over 5 m (16 ft) length
(Air bubbles collect in measuring
Install air valve ✇ downstream of
tube - faulty measurements!)
flowmeter.
Pumps
Open feed or discharge
Never install flowmeter on pump suction side.
Install meter in low section of pipe.
open discharge
Downpipe
“Zero” flow
velocity.
Line drained.
Faulty
measurements!
Long pipeline
Always install control and shutoff valves
downstream of flowmeter.
Preferred
locations
Horizontal pipe run
Install in slightly inclining pipe section. If not
possible, assure adequate velocity to prevent
air, gas or vapour from collecting in upper
part of flow tube.