Vega VEGAFLEX 81 Quick Setup Manual - page 8
8
3 Mounting
VEGAFLEX 81 • Foundation Fieldbus
47589-EN-140324
Plastic vessel/Glass vessel
The guided microwave principle requires a metallic surface on the
processfitting.Therefore,inplasticvessels,etc.,useaninstru-
mentversionwithflange(fromDN50)orplaceametalsheet
(ø>200mm/8in)beneaththeprocessfittingwhenscrewingitin.
Makesurethattheplatehasdirectcontactwiththeprocessfitting.
When installing rod or cable probes in vessels without metal walls,
e.g.inplasticvessels,themeasuredvaluecanbeinfluencedby
strongelectromagneticfields(emittedinterferenceaccordingto
EN61326:classA).Inthiscase,useaprobewithcoaxialversion.
1
2
Fig. 3: Installation in non-metallic vessel
1 Flange
2 Metal sheet
Ifpossible,avoidsockets.Mountthesensorflushwiththevesseltop.
If this is not possible, use short sockets with small diameter.
Higher sockets or sockets with a bigger diameter can generally be
used. They can, however, increase the upper blocking distance (dead
band). Check if this is relevant for your measurement.
In such cases, always carry out a false signal suppression after instal-
lation.Youcanfindfurtherinformationunder"Setup procedure".
Type of vessel
Socket