Liquiphant M FTL51C
Endress+Hauser 13
Electronic insert FEL57 (PFM)
Power supply Supply voltage: DC 9.5 to 12.5 V
Current consumption: 10 to 13 mA
Power consumption: < 150 mW
Reverse polarity protection
Electrical connection Two-wire connection for separate switching unit
The check is activated and monitored at the switching unit.
The twin-core connecting cable (instrument cable) with a cable resistance of 25 per core is
connected to the screw terminals (conductor cross-sections 0.5 to 2.5 mm / 0.02 to 0.1 in) in the
connection compartment. Protective circuits against reverse polarity, HF influences and overvoltage
peaks are installed.
Maximum cable length up to 1000 m (3281 ft).
A shielded connecting cable is recommended in the event of strong electromagnetic interference. Here
the shielding must be connected to the sensor and the power supply.
For connecting to Endress+Hauser switching units
Nivotester FTL320, FTL325P, FTL370, FTL372,
FTL375P (also with proof test).
Output signal jump of the PFM signal from high to
low frequency when sensor is covered. Switching
between minimum/maximum safety in the
Nivotester.
Additional function “cyclical checking”:
After interruption of the power supply,
a test cycle is activated
which checks the sensor and electronics
without any change in level.
Approved for overfill protection acc. to WHG
(German Water Resources Act).
The following can be switched at the electronic
insert:
– Standard
(STD):
simulation approx. 8 s
tuning fork exposed – covered – exposed.
For proof testing, the Nivotester tests the
sensor's level notification function.
– Extended (EXT):
Simulation approx. 41 s: tuning fork exposed –
covered – alarm – exposed.
For proof testing, the Nivotester tests the
sensor's level notification function and fault
notification (alarm) function.
L00-FTL5xxxx-04-05-xx-en-003
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