KROHNE OPTIWAVE 7300C EN - Manual (Page 73)

OPERATION
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OPTIWAVE 7300 C
www.krohne.com 03/2014 - 4000172405 - HB OPTIWAVE 7300 R07 en
6.4.7 How to make a filter to remove radar signal interference
If the device measures level in a tank that contains obstructions (agitator, supports, heating
pipes etc.), these objects can cause radar signal interference (parasitic signals). You can use the
empty spectrum function (menu item A.1.3) in the Quick Setup menu to make a filter to remove
radar signal interference.
• Get access to the Main Menu Main Menu Main Menu Main Menu of the supervisor mode.
i For more data, refer to How to get access to the supervisor mode on page 51.
• Go to Main Menu > Quick Setup > Setup Mode > Empty Spectrum Main Menu > Quick Setup > Setup Mode > Empty Spectrum Main Menu > Quick Setup > Setup Mode > Empty Spectrum Main Menu > Quick Setup > Setup Mode > Empty Spectrum.
• Is the tank completely full? Select Yes Yes Yes Yes or No No No No and then push [^ ^ ^ ^].
i If you select Yes Yes Yes Yes, the device will not do the empty spectrum scan. Empty the tank and repeat
the procedure.
• Are all the moving parts switched on? Select Yes Yes Yes Yes or No No No No and then push [^ ^ ^ ^].
• Is your tank partially filled or completely empty? Select Partially filled Partially filled Partially filled Partially filled or Empty Empty Empty Empty and then push
[^ ^ ^ ^].
• Do you want to use the average value or the maximum value? Select Average Average Average Average or Maximum Maximum Maximum Maximum and
then push [^ ^ ^ ^].
i Use the maximum for tanks that have moving parts. Use the average value for tanks that do
not have moving parts. The device will do an empty spectrum scan and then display the
results on the signal screen.
INFORMATION!
We recommend that you do an empty spectrum scan when the tank is empty and all the moving
parts (agitators etc.) are in operation..
Figure 6-7: How to make a filter to remove radar signal interference
1 Empty tank before the device uses the empty spectrum scan (with a graph of reflections shown)
2 Partially filled tank before the device uses the empty spectrum scan (with a graph of reflections shown)
3 Partially filled tank after the device uses the empty spectrum scan (with a graph of reflections shown)
4 Agitator blades location
5 Tank bottom signal
6 Agitator blades signals (interference signals) before the device does the empty spectrum scan
7 Bad quality (mixed) signals of the liquid and the agitator blades before the device does the empty spectrum scan
8 Reflected signal if the device uses the data from the empty spectrum scan. The device only uses the reflection on the
surface of the liquid to measure distance.