8
3 Mounting
VEGAPULS 69 • 4 … 20 mA/HART - four-wire
47255-EN-140801
3 Mounting
3.1 Mounting preparations, mounting strap
The strap is supplied unassembled and must be screwed to the
sensor before setup with three hexagon screws M5 x 10 and spring
washers. Max. torque, see chapter "
Technical data
". Required tools:
Allen wrench size 4.
There are two ways to screw the strap onto the sensor. Depending
on the selected version, the sensors can be swivelled in the strap as
follows:
•
Single chamber housing
–
Angle of inclination 180°, infinitely variable
– Angle of inclination in three steps 0°, 90° and 180°
•
Double chamber housing
–
Angle of inclination 90°, infinitely variable
– Angle of inclination in two steps 0° and 90°
3.2 Mounting instructions
Radar sensors for level measurement emit electromagnetic waves.
The polarization is the direction of the electrical component of these
waves.
The polarization direction is marked by a nose on the housing, see
following drawing:
1
Fig. 2: Position of the polarisation
1 Nose for marking the direction of polarisation
Information:
When the housing is rotated, the direction of polarization changes
and hence the influence of the false echo on the measured value.
Please keep this in mind when mounting or making changes later.
Mount the sensor at least 200 mm (7.874 in) away from the vessel
wall.
Polarisation
Installation position