Endress+Hauser Levelflex M FMP40 Operating Instructions Manual page 52

Commissioning
⇒
ENDRESS + HAUSER
–
+ E
52
Deviating from this, the following measured error occurs for thin interface layers
(only "K" interface measurement electronics version):
±50
±40
±30
±20
±10
0
Function "Medium Property" (003)
Use this function to enter the dielectric constant of the upper medium (upper phase).
Options:
• 2.00
The tables below split the DK values by product group. However, it is not sufficient to assume a
typical value. For accurate interface measurement, it is necessary to determine the DK of the upper
medium (upper phase) as accurately as possible and enter the value in this function.
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.
ε
DK ( r) Typical liquids
1.4 to 1.6 – Liquefied gases, e.g. N
– Liquefied gas, e.g. propane
– Solvent
1.6 to 1.9
– Freon
– Palm oil
1.9 to 2.5 – Mineral oils, fuels
– Benzene, styrene, toluene
2.5 to 4 – Furan
– Naphthalene
Levelflex M FMP40 with HART/4...20 mA
rod probe (example), also valid for coax probe
No measurement
upper
possible in
medium
this area
200 60
thickness of upper medium
[mm]
, CO
2 2
lower medium
0
Interface
L00-FMP4xIxx-05-00-00-en-001
Endress+Hauser