Endress+Hauser Liquiphant FTL64 - Mounting Considerations for Process Conditions; Temperature Management for PFA Coatings; Switch Point and Viscosity Factors

Liquiphant FTL64 HART Mounting
Endress+Hauser 13
5.1.1 Pay attention to the temperature for devices with a PFA
coating (conductive)
The difference in temperature between the outer and inner side of the flange may not
exceed 60 °C (140 °F).
If necessary, use external insulation.
A
B
B
A
-
C
1
C
=
A0042298
 4 Difference in temperature between outer and inner side of flange
1 Insulation
A Temperature of flange, outer side
B Temperature of flange, inner side, for PFA (conductive) maximum 230 °C (446 °F)
C Difference in temperature for PFA (conductive) maximum 60 °C (140 °F)
5.1.2 Take switch point into consideration
The following are typical switch points, depending on the orientation of the point level
switch.
Water +23 °C (+73 °F)
Minimum distance between the fork tip and the tank wall or pipe wall:
10 mm (0.39 in)
~13 (0.5)
~5 (0.2)
~12.5 (0.49)
D
A B C
D
D
A0044069
 5 Typical switch points. Unit of measurement mm (in)
A Installation from above
B Installation from below
C Installation from the side
D Switch point
5.1.3 Take viscosity into consideration
Low viscosity
Low viscosity, e.g. water: < 2 000 mPa⋅s
It is permitted to position the tuning fork within the installation socket.