Output; Switch Behavior; Switch-On Behaviour; Fail-Safe Mode - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Liquicap M FTI51
2) For FEI53 and FEI57S only on the associated Nivotester: FTC325.
3) E.g. for dry running protection and pump protection.
4) E.g. for use with overfill protection.
5) Functional galvanic isolation in the electronic insert.
Endress+Hauser
l minimum probe length
min
ΔC 5 pF
min
C probe capacitance in air
s
ε dielectric constant, e.g. oil = 2.0
r
To check the probe capacitance in the air, see the chapter "Additional capacitance"
→  78.
12.3

Output

12.3.1

Switch behavior

Binary or ∆s operation.
The pump control is not possible with FEI58.
12.3.2

Switch-on behaviour

When the power supply is switched on, the switching status of the outputs corresponds to
the signal on the alarm.
The correct switch condition is reached after a maximum of 3 s.
12.3.3

Fail-safe mode

Minimum and maximum quiescent current safety can be switched at the electronic
2)
insert .
MIN
Minimum safety: the output switches safety-oriented when the probe is uncovered
(signal on alarm).
MAX
Maximum safety: the output switches safety-oriented when the probe is covered
on alarm).
12.3.4

Galvanic isolation

FEI51 and FEI52
between the probe and power supply
FEI54
between the probe, power supply and load
FEI53, FEI55, FEI57S and FEI58
see connected switching device
Δ C
min
l =
min
C ·( - 1) ε
s r
5)
Technical data
A0040204
3)
4)
(signal
79