VEGA VEGAFLEX 83 4 … 20 mA_HART two-wire Polished version - Manual (Page 20)

20
4 Mounting
VEGAFLEX 83 • 4 … 20 mA/HART two-wire
41839-EN-130612
Do not mount the instruments in or above the filling stream. Make sure
that you detect the product surface, not the inflowing product.
Fig. 11: Mounting of the sensor with inflowing medium
The reference plane for the measuring range of the sensors is the
sealing surface of the thread or flange.
Keep in mind that a min. distance must be maintained below the refer-
ence plane and possibly also at the end of the probe - measurement
in these areas is not possible (dead band). The length of the cable
can be used all the way to the end only when measuring conductive
products. These blocking distances for different mediums are listed
in chapter "Technical data". Keep in mind for the adjustment that the
default setting for the measuring range refers to water.
The process fitting must be sealed if there is gauge or low pressure in
the vessel. Before use, check if the seal material is resistant against
the measured product and the process temperature.
The max. permissible pressure is specified in chapter "Technical
data" or on the type label of the sensor.
In case of difficult installation conditions, the probe can be also
mounted laterally. For this purpose, adapt the rod with rod extensions
or bow-shaped segments.
Let the probe length determine automatically by the instrument to
compensate the resulting running time changes.
The determine probe length can deviate from the actual probe length
when using bow-shaped segments.
If installations such as struts, ladders, etc. exist on the vessel wall,
then the probe should have a distance to the vessel wall of at least
300 mm (11.81 in).
You can find further information in the supplementary instructions of
the rod extension.
Inflowing medium
Measuring range
Pressure
Lateral installation