The "flow" menu
41
"flow N empty calibration" (N = 1 or 2)
"empty E"
Use this parameter to enter the empty distance E, i.e. the distance between the sensor membrane
and the zero point of the flume or weir.
For flumes, the zero point is the bottom of the flume at the narrowest position:
L00-FMU90xxx-19-00-00-yy-027
Example: Khafagi-Venturi flume
E: empty distance; D: measured distance; L: level
For weirs, the zero point is the lowest point of the weir crest:
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Example: Triangular weir
E: empty distance; D: measured distance; L: level
"blocking distance"
Indicates the blocking distance of the respective sensor. The blocking distance is measured from the
sensor membrane. The maximum level may not project into the blocking distance.
⇒
flow 1 empty cal. F1010
empty E: 0,00 m
blocking dist.
FDU 91
E
D
L
FDU 91
E
L
D
Type of sensor blocking distance (BD) maximum measuring dis-
tance
1)
FDU91/FDU91F 0,3 m 10 m (for liquids)
FDU92 0,4 m 20 m (for liquids)
FDU93 0,6 m 25 m (for liquids)
FDU95 - *1*** (low temperature version) 0,7 m 45 m (for solids)
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