User Manual

6 OPERATION
72
OPTIWAVE 7400-24 C
www.krohne.com 12/2015 - 4004901901 - MA OPTIWAVE7400-24 R01 fr
You can change the reference point from which distance is measured. Use this menu
item:
• Reference Offset (2.3.7)
6.4.6 Level measurement
The device displays level measurements when the output function is set to "Level".
Menu items related to level measurement are:
• Output Function (2.4.1)
• Tank Height (2.3.1)
• Blocking Distance (2.3.2)
You can change the reference point from which level is measured. Use this menu item:
• Tank Bottom Offset (2.3.8)
INFORMATION!
If you move the reference point above the flange, add this value when you give a distance for the
4 and 20 mA current output settings. If you move the reference point below the flange, subtract
this value when you give a distance for the 4 and 20 mA current output settings.
CAUTION!
If the distance for 4 mA is set in the blocking distance, the device will not be able to use the full
current output range.
Figure 6-4: Distance measurement
1 Tank Height (2.3.1)
2 Reference Offset (2.3.7)
3 Blocking Distance (2.3.2)
4 4mA Setting (2.4.3)
5 20 mA Setting (2.4.4)
6 Maximum effective measuring range
7 Non-measurement zone