KROHNE OPTIFLEX 1300C EN - Manual (Page 96)

6
OPERATION
96
OPTIFLEX 1300 C
www.krohne.com 03/2014 - 4000172306 - HB OPTIFLEX 1300 R07 en
6.4.9 How to use the snapshot function to filter parasitic signals
The thresholds cannot find the level of the tank contents if it is below a large parasitic signal.
This shows the signals as you can see them on an oscilloscope:
But you can filter a parasite or an area of parasites with the snapshot function. This procedure
tells you how to use the snapshot filter:
• Look at the signal screen in operator mode.
i Find the likely position of the parasite.
• Look in the tank or at a drawing of internal tank parts.
i Get the dimensions and position of the object that shows as the parasite.
• Empty the tank.
• Go to Supervisor > Quick Setup > Setup Mode > Snapshot
Supervisor > Quick Setup > Setup Mode > Snapshot Supervisor > Quick Setup > Setup Mode > Snapshot Supervisor > Quick Setup > Setup Mode > Snapshot
• Do the procedure.
• Save the settings.
• Make sure that the snapshot filter is on.
• Fill the tank.
i The device will ignore the large parasite signal and use the first signal it finds.
Figure 6-11: Voltage/distance graph: level below a large parasitic signal
1 Voltage amplitude of the signal in Volts
2 Distance from the process connection
3 Large parasitic signal (an agitator in this example)
4 Threshold
5 Level signal