KROHNE OPTIWAVE 7300C EN - Manual (Page 64)

6
OPERATION
64
OPTIWAVE 7300 C
www.krohne.com 03/2014 - 4000172405 - HB OPTIWAVE 7300 R07 en
C.1.8 Overfill
Detection
If this function is switched on, the
device will monitor the level even if it is
in the blocking distance. The displayed
output stays fixed at the blocking
distance, but an error message will
warn the user that the tank is
overfilling.
Yes, No No
C.1.9 Blocking
Distance
The distance from the flange to the top
limit of the measuring range (a zone
given by the user where it is not
possible to measure). We recommend
a blocking distance at least 100 mm /
4¨ below the antenna. If the distance is
less than the blocking distance, the
device continues to display the
blocking distance.
min-max:
antenna extension (C.1.6) +
50 mm / 2¨…tank height (C.1.2)
0.5 m / 1.6 ft
C.1.10 Reference
Offset
Offset relating to a reference location
(distance). This value is positive when
the reference location is above the
device flange face and negative if
below. For more data, refer to Distance
measurement on page 69.
min-max:
-tank height…50 m /
-tank height...164.05 ft
0 m / 0 ft
C.1.11 Tank Bottom
Offset
Offset relating to a reference location
(level). The device reference point for
this parameter is the bottom of the
tank (set in menu item C.1.2.0). This
value is positive when the reference
location is below the tank bottom and
negative if above. For more data, refer
to Level measurement on page 70.
min-max:
-tank height...3000 m /
-tank height...9843 ft
0 m / 0 ft
C.1.12 Time Constant Using this function, the device
processes several measurement
readings to filter out disturbances.
Increasing the time constant will
smoothen the integrated readings,
decreasing will roughen the readings.
min-max: 1...100 sec (seconds) 3 sec
C.1.13 Measuring
Mode
The device uses the dielectric constant
(ε
r
) of the tank contents to monitor
level. This menu item is set by default
to "Direct Measuring" for tank contents
with an ε
r
>1.6. If ε
r
is low, select "TBF
Partial" mode. If ε
r
is very low (<1.5),
select "TBF Full". If you want the
device to measure level using the first
good radar signal it finds, select
"Option 1". If you want the device to
measure level but ignore all the radar
signals stored in the empty spectrum
scan, select "Option 2". "Option 3" is
not yet available.
Direct Measuring, TBF Partial,
TBF Full, Option 1, Option 2,
Option 3
Direct
Measuring
C.1.14 Product Er The device automatically calculates the
level based on the product ε
r
. If you
select "TBF Partial" or "TBF Full" in
item C.1.13, you can change this value
manually to adjust readings.
min-max: 1.01…99.90 4
C.1.15 Tracing
Velocity
This function sets the maximum rate of
change of level. The measured value
cannot change faster than the tracing
velocity.
min-max:
0.001…10.000 m/min /
0.003…32.8 ft/min
0.5 m/min /
1.64 ft/min
Menu
No.
Function Function description Selection list Default