Endress+Hauser Liquicap M FMI51 HART - Minimum Probe Length for Nonconductive Media < 1 Μs;CM; Installation Examples; Rod Probes

Mounting Liquicap M FMI51 HART
16 Endress+Hauser
≥500 (19.7)
100%
0 %
L1
L3
A0040419
Unit of measurement mm (in)
L1 Measuring range
L3 Inactive length
When installing in a nozzle, use inactive length (L3).
The 0 % and 100 % calibration can be inverted.
4.4 Minimum probe length for nonconductive media
< 1 µS/cm
The minimum probe length can be calculated using the formula:
l =
min
Δ C
min
C ·( - 1)
s r
ε
A0040204
l
min
minimum probe length
ΔC
min
5 pF
C
s
probe capacitance in air
ε
r
dielectric constant, e.g. oil = 2.0
4.5 Installation examples
4.5.1 Rod probes
The probe can be installed in:
• conductive tanks made from metal
• nonconductive tanks made from plastic
If the process connection of the probe is insulated from the metal tank using a seal
material, then the ground connection on the probe housing must be connected to the tank
using a short line.