Endress+Hauser Levelflex M FMP40 Series Technical Information page 5

Levelflex M FMP40
Endress+Hauser
Interface measurement
When the high-frequency pulses hit the surface of the medium, only a percentage of the transmission pulse is
reflected. In the case of media with a low DK
is reflected once more at the interface point to a second medium with a higher DK
interface layer now can also be determined taking into account the delayed time-of-flight of the pulse through
the upper medium.
Output
The Levelflex is preset at the factory to the probe length ordered so that in most cases only the application
parameters that automatically adapt the device to the measuring conditions need to be entered. For models
with a current output, the factory adjustment for zero point E and span F is 4 mA and 20 mA, for digital outputs
and the display module 0 % and 100 %. A linearization function with max. 32 points, which is based on a table
entered manually or semi-automatically, can be activated on site or via remote operation. This function allows
the level to be converted into units of volume or mass, for example.
, in particular, the other part penetrates the medium. The pulse
1
DK
1
DK
2
. The distance to the
2
c = c = 300,000 km/s
0
total level
C
0
C =
1
DK
1
interface level
L00-FMP4xxxx-15-00-00-en-007
5