General Information On Interface Measurement - Endress+Hauser Levelflex M FMP40 Operating Instructions Manual

Levelflex M FMP40 with HART/4...20 mA
Endress+Hauser
3.4

General information on interface measurement

The Levelflex M with the "interface" electronics version is the ideal solution for measuring
interfaces. The device measures variable interfaces and variable total levels simultaneously.
min. 60 mm
In addition, the following general conditions must be observed for interface measurement:
• The DK of the upper medium must be known and constant. The DK can be determined with the
aid of the DK manual SD106F. In addition, it is also possible to calculate the DK automatically in
FieldCare if the interface thickness is available and known → ä 84.
• The DK of the upper medium may not be greater than 10.
• The DK difference between the upper medium and lower medium must be >10.
• The interface must have a minimum thickness of 60 mm.
• Emulsion layers in the vicinity of the interface can severely dampen the signal. However,
emulsion layers up to 50 mm are permitted.
• The measuring range for interface measurement is limited to 10 m. Larger measuring range
available on request.
overall
level
DK
1
interface
DK
2
Installation
DK
1
DK
2
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