11
4 Mounting
VEGAWAVE 62 • Two-wire 8/16 mA
32255-EN-181126
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.
The vibrating level switch is a measuring instrument and must be
treated accordingly. Bending the vibrating element will destroy the
instrument.
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Use the hexagon above the thread for screwing in.
Metric threads
In the case of instrument housings with metric thread, the cable
glands are screwed in at the factory. They are sealed with plastic
plugs as transport protection.
You have to remove these plugs before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
free openings for the cable glands are therefore covered with red dust
protection caps as transport protection.
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
4.2 Mounting instructions
Make sure that the max. permissible tensile load of the suspension
cable is not exceeded. The danger of this happening exists particu-
larly with very heavy solids and large meas. lengths. The max. permis-
sible load is stated in chapter "
Technical data
".
In silos with bulk solids, material cones can form which change the
switching point. Please keep this in mind when installing the sensor
in the vessel. We recommend selecting an installation location where
the sensor detects the average value of the material cone.
The tuning fork must be mounted in a way that takes the arrangement
of the filling and emptying apertures into account.
To compensate measurement errors caused by the material cone in
cylindrical vessels, the sensor must be mounted at a distance of d/10
from the vessel wall.
Pressure/Vacuum
Handling
Cable entries - NPT
thread
Cable glands
Tensile load
Material cone
