Vega VEGAPULS 68 - Page 48

48
6 Set up with the display and adjustment module
VEGAPULS 68 • Foundation Fieldbus
36538-EN-170405
Open water (gauge measurement):
•
Rate of level change: slow level change
•
Process/measurement conditions:
– Large distance from sensor to water surface
– Extreme damping of output signal due to wave generation
– Ice and condensation on the antenna possible
– Spiders and insects build nests in the antennas
– Floating material and animals sporadically appear on water
surface
•
Properties, sensor:
– Stable and reliable measured values through frequent averag-
ing
– Insensitive in the close range
Openume(ow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ooding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dierent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