43
6 Set up with the display and adjustment module
NCR-84 Two-wire 4 … 20 mA/HART
51141-EN-181127
For operation of the instrument in plastic tanks, certain conditions
must be fulfilled (see chapter "
Radio licenses
" for Europe, USA and
Canada).
Transportable plastic tank
•
Vessel:
– Material and thickness different
– Measurement through the vessel top
•
Process/measurement conditions:
– Measured value jump with vessel change
•
Properties, sensor:
– Quick adaptation to changing reflection conditions due to ves-
sel change
– False signal suppression required
For operation of the instrument in plastic tanks, certain conditions
must be fulfilled (see chapter "
Radio licenses
" for Europe, USA and
Canada).
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 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 spillover (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:
925-0373 Rev A