Vega VEGAPULS 67 Operating Instructions Manual page 40

6 Set up with the display and adjustment module
Setup - Vessel form
40
– Insensitive in the close range
Open flume (flow measurement):
•
Rate of level change: slow level change
•
Process/measurement conditions:
– Ice and condensation on the antenna possible
– Spiders and insects build nests in the antennas
– Smooth water surface
– Exact measurement result required
– Distance to the water surface normally relatively large
•
Properties, sensor:
– Stable and reliable measured values through frequent averag-
ing
– Insensitive in the close range
Rain water overfall (weir):
•
Rate of level change: slow level change
•
Process/measurement conditions:
– Ice and condensation on the antenna possible
– Spiders and insects build nests in the antennas
– Turbulent water surface
– Sensor flooding possible
•
Properties, sensor:
– Stable and reliable measured values through frequent averag-
ing
– Insensitive in the close range
Demonstration:
•
Adjustment for all applications which are not typically level meas-
urement
– Instrument demonstration
– Object recognition/monitoring (additional settings required)
•
Properties, sensor:
– Sensor accepts all measured value changes within the measur-
ing range immediately
– High sensitivity to interference, because virtually no averaging
Caution:
If liquids with different dielectric constants separate in the vessel, for
example through condensation, the radar sensor can detect under
certain circumstances only the medium with the higher dielectric
constant. Keep in mind that layer interfaces can cause faulty meas-
urements.
If you want to measure the total height of both liquids reliably, please
contact our service department or use an instrument specially de-
signed for interface measurement.
Apart from the medium and the application, the vessel form itself can
influence the measurement. To adapt the sensor to these measuring
conditions, this menu item offers different options for vessel bottom
and ceiling for certain applications.
VEGAPULS 67 • 4 ... 20 mA/HART - four-wire