5.5.1. Transmission of the level sensor data
Figure 10: Level sensor plug-in connector
The data is transferred digitally to the level sensor interface, whereby the level
sensor can only send data. Hence, it is impossible to change the software or the
parameters. In addition to that it is impossible to exchange the level sensors,
ATTENTION:
We use special cable sockets made by Hirschmann, which are particularly
suitable for this purpose. Other cables must not be used!
5.5.2. Suppression of surface waves (sloshing of the liquid)
If undulations occur, in particular when the tank truck brakes, then these are damped:
1. by the sensor protection tube, which is connected to the tank compartment by boreholes,
and
2. by a digital filter in the sensor.
The delivery is only enabled if a valid average value of the sloshing liquid can be formed.
ATTENTION:
Undulations sometimes take a long time to subside if the tank compartments
have an unfavorable shape! Tank compartments should be constructed in such
a way that undulations subside quickly.
5.6. Explanation of the gauge tables
5.6.1. Tank shape and calibration
Tank shape
An individual gauge table must be provided for each tank compartment by means of
the gauge table and interpolation. The accuracy attained when manufacturing the measuring
system determines the accuracy of the delivery measurements. The more precisely the system
the applicable rules and approvals must be adhered to.
MultiLevel Instruction Manual Description of the Level Gauging System
Special M12
plug-in connector
by Hirschmann.
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