Operation – KROHNE OPTIWAVE 7300C EN User Manual
Page 74
6
OPERATION
74
OPTIWAVE 7300 C
www.krohne.com
03/2014 - 4000172405 - HB OPTIWAVE 7300 R07 en
• Push [^
^
^
^]. Do you want to save the spectrum. Select Yes
Yes
Yes
Yes or No
No
No
No and then push [^
^
^
^].
i
If you select Yes
Yes
Yes
Yes, the device will use the empty spectrum scan results to make a filter to
remove radar signal interference.
6.4.8 How to measure correctly in tanks with curved or conical bottoms
It is possible that the device cannot find the bottom of the tank if it is installed in a tank with a
dish-shaped or conical bottom. The form of the tank bottom causes a delayed radar reflection
and the device will display the error message "Measurement is lost in the tank bottom".
You can offset the tank bottom reference point to find the delayed radar reflection. Obey the
instructions that follow:
• Empty the tank.
• Increase the tank height in menu C.1.2.
• Go to the signal screen
signal screen
signal screen
signal screen in operator mode.
i
You will see a graph of reflections.
• Push [>>>>] to move the cursor to the reflection with the largest amplitude (given in dB).
• Make a note of the distance of the reflection measured by the device.
i
The distance to the reflection will be the new tank height.
• Subtract the distance to the reflection from the true tank height.
• Go to Supervisor > Advanced Setup > Installation Setup > Tank Bottom Offset
Supervisor > Advanced Setup > Installation Setup > Tank Bottom Offset
Supervisor > Advanced Setup > Installation Setup > Tank Bottom Offset
Supervisor > Advanced Setup > Installation Setup > Tank Bottom Offset.
• Type in the difference you calculated as a negative value.
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A negative value will move the reference point above the tank bottom (as given in menu
item C.1.2 Tank height).
• Push [^
^
^
^].
• Push [>>>>] and [
] (Esc) at the same time to exit to the "save settings" window.
• Select Save
Save
Save
Save and push [^
^
^
^].
i
The device will go back to operator mode.
INFORMATION!
For more data on empty spectrum scans, refer to Function description on page 57
–
table A.
Quick Setup (menu item A.1.3).