Operation – KROHNE OPTIFLEX 1300C EN User Manual

Page 96

OPERATION

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.

Find the likely position of the parasite.

• Look in the tank or at a drawing of internal tank parts.

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

• Do the procedure.
• Save the settings.
• Make sure that the snapshot filter is on.
• Fill the tank.

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