Vega VEGAMET 841 Operating page 33

Example
Adjustment
VEGAMET 841 • 4 ... 20 mA
100%
Rel. 1: 90%
Rel. 2: 5%
0%
Fig. 13: Example of level measurement, horizontal cylindrical tank
A horizontal cylindrical tank has a capacity of 10000 litres. The meas-
urement is carried out with a level sensor operating according to the
guided microwave principle. The filling by a tank car is controlled via
relay 1 and a valve (overfill protection). The discharge is carried out
via a pump and is controlled by relay 2 (dry run protection). The max.
volume should be at 90 % level, this means 9538 litres with a stand-
ard vessel (according to sounding table). The min. level should be set
to 5 %, this corresponds to 181 litres. The volume is to be displayed
in litres.
Setup
An application wizard guides you through the most common selection
possibilities. Further application options are available on the corre-
sponding DTM/app pages. A more detailed description of all available
application options is included in the DTM online help.
The following steps must be carried out in the application wizard:
•
Selection of the application "Level storage tank"
•
Assign measuring loop name
•
Define sensor characteristic values (sensor type, measuring
range, ...)
•
Define linearization
•
Adjustment
•
Scaling
•
Configure relay (mode of operation, switching points, ...)
Carry out the adjustment in the controller as described in chapter
"Setup steps". No further adjustment may be carried out in the sensor
itself. For the max. adjustment, fill the vessel up to the requested max.
level and accept the actually measured value. If this is not possible,
the corresponding current value can also be entered. For the min.
adjustment, empty the vessel down to the min. level or enter the cor-
responding current value.
10 Applications and functions
Rel. 1 Rel. 2
33