Operation – KROHNE OPTIFLEX 1300C EN User Manual

Page 93

OPERATION

OPTIFLEX 1300 C

www.krohne.com

03/2014 - 4000172306 - HB OPTIFLEX 1300 R07 en

How to use thresholds

If the parasitic signal is smaller than the correct level, you can manually change the threshold to
find the signal.

This procedure tells you how to change the level threshold to find the correct signal:

• Look at the signal screen in operator mode.

Find the likely position of the parasitic and level signals. Make a note of the amplitude of
each signal in volts.

• Go to Supervisor > Advanced Setup > Installation Setup > Level Threshold

Supervisor > Advanced Setup > Installation Setup > Level Threshold

You will see this screen:

INFORMATION!
Also refer to How to use the snapshot function to filter parasitic signals on page 96

to use the

snapshot function to filter parasitic signals. For more data about the menu items, refer to

Function description on page 73

(table C. Advanced setup).

INFORMATION!

•

Although the data that follows refers to the level threshold, it is applicable for the probe end
threshold.

•

If there is a parasitic signal above the level and the threshold is too low, the device can
incorrectly use it as the level signal.

Figure 6-9: Voltage/distance graph: thresholds

1 Voltage amplitude of the signal in Volts
2 Distance from the process connection
3 Parasitic signal. A signal from a level switch that is in the limits of the electromagnetic field around the probe.
4 Level signal of the liquid or solids
5 The level threshold is correct. The device ignores the parasitic signal and measures level correctly.
6 The level threshold is too low. The device can use the parasitic signal as the level signal.