KROHNE ALTOFLUX M 900 EN - Manual (Page 5)

Installation and operating instruction ALTOFLUX M900 and 3080 K 5
• 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.
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 ascending pipe section. If
not possible, assure adequate velocity to
prevent air, gas or vapor from collecting in
uppper part of flow tube.