User Manual

OPERATION 6
63
OPTIWAVE 7400-24 C
www.krohne.com12/2015 - 4004901901 - MA OPTIWAVE7400-24 R01 fr
2.3.2 BLOCK. DIST. 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 of 500 mm / 19.7¨ below
the process connection. We also
recommend that the limit of the measuring
range is not less than the blocking distance.
If it is possible that the tank contents will go
above the blocking distance, set 2.5.5
OVERF. ENAB. to "Yes". If the distance is
less than the blocking distance, the device
continues to display the blocking distance.
min: 100 mm / 13.9¨ or
2.3.6 ANTENNA.EXT
max: 2.3.1 TANK HEIGHT
500 mm / 19.7¨
2.3.3 TIME CONST. 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.
s=seconds.
min-max: 1.00...100.00 s 5.00 s
2.3.4 TAG NAME The device has an identification code (tag
name). The supervisor can enter a
maximum of 8 numbers or letters.
1
2.3.5 ANTENNA.EXT Optional antenna extensions.These are
attached between the flange and the
antenna.
min: 0 mm / 0¨ or 2.3.6
ANTENNA.EXT
max: 2000 mm / 78.7¨ or
2.3.1 TANK HEIGHT
1
2.3.6 DIST.PIECE Optional distance piece between the
converter and the process connection. This
is for high-temperature applications more
than +150°C / +302°F. The distance piece is
120 mm / 4.7¨ long. For more data, refer to
Technical data on page 87.
min: 0 mm / 0¨
max: TANK HEIGHT
1
2.3.7 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 71.
min-max:
-tank height…50 m /
-tank height...164.05 ft
0m/ 0ft
2.3.8 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 72.
min-max:
-tank height...3000 m /
-tank height...9843 ft
0m/ 0ft
2.4.0 OUTPUT I
2.4.1 OUTPUT FUNC. The output function. Select an output
function to scale the current values in
relation to a given point (usually the device
process connection or the tank bottom). The
output current value is shown on a bar
graph in normal mode if the measurement
type is the same as the output function.
Conversion parameters are shown
(Conversion, Ullage conversion) if there is
level-volume, level-mass or level-flow rate
data in 2.8.1 INPUT TABLE.
Distance, Level,
Conversion, Ullage
conversion, Reflection
1
Menu
No.
Function Function description Selection list Default