C.6.2
Volume flow table
The volume flow table is used to convert the measured level into a volume flow rate. Up to
30 level-volume flow pairs can be entered.
C.6.3
Volume flow formula
Table C-2: Parshall Flume Parameters
Parameter
Description
Constant K
The flume specific factor K in formula Q = K
×
H
n
where H is the
measured level
Exponent n
The flume specific factor n in formula Q = K
×
H
n
where H is the
measured level
Maximum level value
The flume maximum Level (weir height)
Table C-3: Khafagi-Venturi Flume Parameters
Parameter
Description
Constant K
The flume specific factor K in formula Q = K
×
H
1.5
where H is the
measured level
Maximum level value
The flume maximum Level (weir height)
C.7
Advanced setup
C.7.1
Measurement recovery time
The Measurement Recovery Time (Echo Timeout) parameter controls the maximum time
from when measurement is lost (e.g. due to process conditions such as foam or
turbulence) until it is annunciated. If measurement is recovered within the time specified
by this parameter, then it will not be annunciated.
C.7.2
Damping value
This parameter defines how fast the transmitter reacts to a change of the level value (step
response). The default value is 2 seconds.
A high value makes the level reading steady, while a low value allows the transmitter to
respond to rapid level changes (but the presented level value may be less steady).
C.7.3
General threshold
The general threshold is used to filter out noise and disturbing echoes from the product
surface echo. The transmitter uses certain criteria to decide which type of echo peak that
is detected. Only echoes above the general threshold might be considered the product
surface.
Reference Manual
Configuration parameters
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May 2021
Reference Manual
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