Endress+Hauser Liquiphant M FTL50 Manual

TI328F/00/en
Technical Information
Liquiphant M FTL50(H), FTL51(H)
Vibration Limit Switch
Level limit switch for all liquids.
Suitable for use in hazardous areas, food and pharmaceuticals
Application
The Liquiphant M is a level limit switch for use in all
liquids
– for process temperatures of –50 °C to 150 °C
– for pressures up to 100 bar
– for viscosity up to 10000 mm2/s
– for densities 0.5 g/cm3or 0.7 g/cm3other settings
available on request
– foam detection on request
The function is not affected by flow, turbulence, bubbles,
foam, vibration, bulk solids content or build-up.
The Liquiphant is thus the ideal substitute for float
switches.
FTL50:
Compact design, ideal for mounting in pipes and for
installation in areas difficult to access
FTL51:
With extension pipe up to 3 m
(6 m on request)
FTL50H, FTL51H:
With polished tuning fork and easy-to-clean process
connections and housings for food and pharmaceutical
applications.
High corrosion-resistant AlloyC4 (2.4610) is available for
the fork and process connections for applications in very
aggressive liquids.
EEx ia, EEx de and EEx d protection enable it to be used
in hazardous areas.
Your benefits
• Use in safety systems requiring functional safety
to SIL2/SIL3 in accordance with IEC 61508/
IEC 61511-1
• Large number of process connections to choose from:
universal usage
• Wide variety of electronics, e.g. NAMUR, relay,
thyristor, PFM signal output: the right connection for
every process control system
• PROFIBUS PA protocol:
for commissioning and maintenance
• No calibration: quick, low-cost start-up
• No mechanically moving parts: no maintenance,
no wear, long operating life
• Monitoring of fork for damage: guaranteed function
• FDA approved materials (PFA Edlon)

Liquiphant M FTL50(H), FTL51(H)
2Endress+Hauser
Table of contents
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Level limit detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Function and system design. . . . . . . . . . . . . . . . . . . . . 4
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Modularity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electronic versions for level limit switches . . . . . . . . . . . . . . . . . . 5
Electronic versions for level sensor . . . . . . . . . . . . . . . . . . . . . . . . 5
Galvanic isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Measuring range (detection range) . . . . . . . . . . . . . . . . . . . . . . . . 5
Product density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electronic insert FEL51 (AC 2-wire) . . . . . . . . . . . . . . 6
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electronics FEL51 (AC, in compact housing). . . . . . . . 7
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electronic insert FEL52 (DC PNP) . . . . . . . . . . . . . . . . 8
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electronics FEL52 (DC PNP, in compact housing) . . . . 9
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electronic insert FEL54 (AC/DC with relay output) . 11
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electronic insert FEL55 (8/16 mA) . . . . . . . . . . . . . . 12
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electronic insert FEL56 (NAMUR L-H edge) . . . . . . . 13
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electronic insert FEL58 (NAMUR H-L edge) . . . . . . . 14
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electronics FEL58 (NAMUR H-L edge,
in compact housing). . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electronic insert FEL57 (PFM). . . . . . . . . . . . . . . . . . 16
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electronic insert FEL50A (PROFIBUS PA) . . . . . . . . . 18
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connection and function . . . . . . . . . . . . . . . . . . . . . . 20
Connecting cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fail-safe mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Switching time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Switch-on behaviour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Performance characteristics. . . . . . . . . . . . . . . . . . . . 20
Reference operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Maximum measured error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Influence of medium temperature . . . . . . . . . . . . . . . . . . . . . . . 20
Influence of product density . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Influence of medium pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . 21
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Examples of mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Ambient temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Medium conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Medium temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Thermal shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Medium pressure pe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Test pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
State of aggregation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Solids content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . 25
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Dimensions in mm (1 mm = 0,0394 in) . . . . . . . . . . . . . . . . . . . 26
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Process connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Human interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Electronic inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Compact housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Operating concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Certificates and approvals . . . . . . . . . . . . . . . . . . . . . 35
General approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Other certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Combination of housings and electronic inserts . . . . . . . . . . . . . 35
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . 37
Product structure Liquiphant M
FTL50, FTL51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Product structure Liquiphant M
FTL50H, FTL51H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Welding neck G ¾ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Welding neck G 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Welding neck G 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Welding neck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
DRD welding flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Lap joint flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Lap joint flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Sliding sleeves for unpressurised operation . . . . . . . . . . . . . . . . . 46
High pressure sliding sleeves . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Transparent cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Cover with sight glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Circular connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Supplementary Documentation . . . . . . . . . . . . . . . . . 49
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Functional Safety (SIL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Safety Instructions (ATEX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Liquiphant M FTL50(H), FTL51(H)
4Endress+Hauser
Application
Level limit detection Maximum or minimum detection in tanks or pipes containing all kinds of liquids, including use in hazardous
areas, food and pharmaceuticals
L00-FTL5xxxx-11-05-xx-xx-000
Function and system design
Measuring principle The sensor's fork vibrates at its intrinsic frequency.
This frequency is reduced when covered with liquid. The change in frequency then activates a limit switch.
Modularity Level limit switch
Liquiphant M FTL with electronic versions
FEL51, FEL52, FEL54
L00-FTL5xxxx-15-05-xx-xx-000
Level sensor
Liquiphant M FTL with electronic versions
FEL55, FEL56, FEL57, FEL58
for connecting to a separate switching unit or
or an isolating amplifier FEL50A
for connecting to PROFIBUS PA segment
L00-FTL5xxxx-15-05-xx-en-000
FEL51/52/54
…
…
FEL55/56/57/58/50A
Ex i
E X E X
Switching unit
PLC
Isolating
amplifier
Segment
coupler

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 5
Electronic versions
for level limit switches
FEL51:
Two-wire AC version;
Switch the load directly into the power supply circuit via the thyristor.
FEL52:
Three-wire DC version;
Switch the load via the transistor (PNP) and separate connection.
FEL54:
Universal current version with relay output;
Switch the loads via 2 floating change-over contacts.
Electronic versions
for level sensor
FEL55:
For separate switching unit; signal transmission 16/8 mA along two-wire cabling.
FEL56:
For separate switching unit; signal transmission L-H edge 0.6…1.0 / 2.2…2.8 mA
to EN 50227 (NAMUR) along two-wire cabling.
FEL58:
For separate switching unit; signal transmission H-L edge 2.2…3.5 / 0.6…1.0 mA
to EN 50227 (NAMUR) along two-wire cabling.
Checking of connecting cabling and other devices by pressing a key on the electronic insert.
FEL57:
For separate switching unit; PFM signal transmission;
Current pulses superposed on the power supply along the two-wire cabling.
Cyclical checking from the switching unit without changing levels.
FEL50A:
For connecting to PROFIBUS PA;
Cyclic and acyclic data exchange acc. to PROFIBUS PA Profile 3.0 Discrete Input
Galvanic isolation FEL51, FEL52, FEL50A:
Between sensor and power supply
FEL54:
Between sensor and power supply and load
FEL55, FEL56, FEL57, FEL58:
See Switching unit connected
Design FTL50:
Compact
FTL51:
With extension pipe
FTL50H:
Compact, with polished tuning fork and hygienic process connections
FTL51H:
With extension pipe, polished tuning fork and hygienic process connections
Input
Measured variable Level (limit value)
Measuring range
(detection range)
FTL50:
Depends on mounting point.
FTL51:
Depends on mounting point and the pipe extension. Standard 3000 mmm (up to 6000 mm on request)
Product density Adjustment on the electronic insert > 0.5 g/cm3or > 0.7 g/cm3(other on request)

Liquiphant M FTL50(H), FTL51(H)
6Endress+Hauser
Electronic insert FEL51 (AC 2-wire)
Power supply Supply voltage: 19...253 V AC
Power consumption: < 0.83 W
Residual current consumption: < 3.8 mA
Short-circuit protection
FEM51 overvoltage protection: overvoltage category III
Electrical connection Two-wire AC connection
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 3.8 mA
Connectable load • For relays with a minimum holding power/rated power > 2.5 VA at 253 V AC (10 mA) or
> 0.5 VA at 24 V AC (20 mA)
• Relays with a lower holding power/rated power can be operated by means of an RC module connected
inparallel
• For relays with a maximum holding power/rated power < 89 VA at 253 V AC or < 8.4 VA at 24 V AC
• Voltage drop across FEL51 max. 12 V
• Residual current with blocked thyristor max. 3.8 mA
• Load switched directly into the power supply circuit via the thyristor.
Transient (40 ms) max. 1.5 A, max. 375 VA at 253 V or max. 36 VA at 24 V (not short-circuit proof)
Always connect in series with a load!
Check the following:
• The residual current in blocked state
(up to 3.8 mA)
• that for low voltage
– the voltage drop across the load is such
that the minimum terminal voltage at the
electronic insert (19 V) when blocked is
not undershot.
– the voltage drop across the electronics when
switched through is observed
(up to 12 V)
• that a relay cannot de-energise with holding
power below 3.8 mA.
If this is the case, a resistor should be
connected parallel to the relay.
(RC module available on request).
• When selecting the relay, pay attention to
the holding power/rated power
(See "Connectable load")
L00-FTL5xxxx-04-05-xx-en-007
L1
U~ max. 253 V AC
50/60 Hz
NNPE
(Ground)
1A
min.
19 V
12
FEL51
*
R
*
External load R
be connectedmust
Safety mode Level Output signal LEDs
green red
IL
< 3.8 mA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-001
Max.
Min.
12
12
12
12
IL
IL
< 3.8 mA
< 3.8 mA

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 7
Electronics FEL51 (AC, in compact housing)
Power supply Supply voltage: 19...253 V AC
Power consumption: < 0.83 W
Residual current consumption: < 3.8 mA
Short-circuit protection
FEM51 overvoltage protection: overvoltage category III
Electrical connection Two-wire AC connection
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 3.8 mA
Connectable load • For relays with a minimum holding power/rated power > 2.5 VA at 253 V AC (10 mA) or
> 0.5 VA at 24 V AC (20 mA)
• Relays with a lower holding power/rated power can be operated by means of an RC module connected
inparallel
• For relays with a maximum holding power/rated power < 89 VA at 253 V AC or < 8.4 VA at 24 V AC
• Voltage drop across FEL51 max. 12 V
• Residual current with blocked thyristor max. 3.8 mA
• Load switched directly into the power supply circuit via the thyristor.
Transient (40 ms) max. 1.5 A, max. 375 VA at 253 V or max. 36 VA at 24 V (not short-circuit proof)
Always connect in series with a load!
Check the following:
• The residual current in
blocked state (up to 3.8 mA)
• that for low voltage
– the voltage drop across
the load is such that the
minimum terminal voltage
at the electronic insert
(19 V) when blocked is not
undershot.
– the voltage drop across
the electronics when switched
through is
observed (up to 12 V).
• That a relay
cannot de-energise with
holding power below 3.8 mA.
If this is the case, a resistor
should be connected parallel
to the relay.
(RC module available on request).
L00-FTL5xxxx-04-05-xx-en-008
MAX MIN
(Ground)
1
(BU)
3
(BN)
R
1.0 A
L1 N
PE
>19V
(Ground)
1
(BU)
2
(BK)
R
1.0 A
L1 N
PE
>19V
(GN/YE) (GN/YE)
1
3
12
FTL5#(H)- #######D3#
(Pg11)
FTL5#(H)- #######E3#
(NPT ½")
FTL5#(H)- #######C3#
(Ground)
R
1.0 A
L1 N
PE
>19V
(Ground)
R
1.0 A
L1 N
PE
>19V
Connector
or
Safety mode Level Output signal LEDs
green red
IL
< 3.8 mA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-001a
Max.
Min.
13
12
12
IL
IL
< 3.8 mA
< 3.8 mA
13

Liquiphant M FTL50(H), FTL51(H)
8Endress+Hauser
Electronic insert FEL52 (DC PNP)
Power supply Supply voltage: 10…55 V DC
Ripple: max. 1.7 V, 0…400 Hz
Current consumption: max. 15 mA
Power consumption: max. 0.83 W
Reverse polarity protection
Overvoltage protection FEL52: overvoltage category III
Electrical connection Three-wire DC connection
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 100 μA
Connectable load • Load switched via the transistor and separate PNP connection, max. 55 V DC
• Load current max. 350 mA (pulsed overload and short-circuit protection)
• Residual current < 100 μA (with transistor blocked)
• Capacitive load max. 0.5 μF at 55 V, max. 1.0 μF at 24 V
• Residual voltage < 3 V (with transistor switched through)
Preferably used with programmable
logic controllers (PLC).
DI module as per EN 61131-2.
Positive signal at switching output of
the electronics (PNP);
Output blocked on reaching limit.
L00-FTL5xxxx-04-05-xx-en-001
12 3
(+)
FEL52
L+ L–
–
0.5 A
U– 10…55 V DC
...
e.g.
Relay
PLC
Safety mode Level Output signal LEDs
green red
IL
< 100 μA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-004
Max.
Min.
L+ +
13
L+ +
13
13
13
I
L
I
L
< 100 µA
< 100 µA

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 9
Electronics FEL52 (DC PNP, in compact housing)
Power supply Supply voltage: 10…55 V DC
Ripple: max. 1.7 V, 0…400 Hz
Current consumption: max. 15 mA
Power consumption: max. 0.83 W
Reverse polarity protection
Overvoltage protection FEL52: overvoltage category III
Electrical connection Three-wire DC connection
Output signal With valve connector or cable tail
Preferably used with programmable
logic controllers (PLC).
DI module as per EN 61131-2.
Positive signal at switching
output of the electronics (PNP);
Output blocked on reaching limit.
L00-FTL5xxxx-04-05-xx-en-010
MAX MIN
52018763
52010285 / 52024216
FTL5#(H)- #######N3#
(M12x1)
FTL5#(H)- #######N3#
(M12x1)
FTL5#(H)- #######D3#
(Pg11)
FTL5#(H)- #######E3#
(NPT ½")
FTL5#(H)- #######C3#
(Ground) (Ground)
0.5 A
L– L–L+ L+
PE PE
+
–
R
33
0.5 A
22 11
+
–
R
(Ground) (Ground)
1
(BU)
3
(BN)
0.5 A
L– L–L+ L+
PE PE
2
(BK)
+
–
R
3
(BN)
0.5 A
1
(BU)
2
(BK)
+
–
R
(GN/YE) (GN/YE)
0.5 A
L– L+
R
0.5 A
L– L+
2
(WT)
1
(BN)
3
(BU)
4
(BK)
2
(WT)
1
(BN)
3
(BU)
4
(BK)
R
Connector
or
Safety mode Level Output signal LEDs
green red
IL
< 100 μA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-004a
Max.
Min.
L+ +
32
I
L
I
L
< 100 µA
< 100 µA
L+ +
32
L+ +
23
L+ +
23

Liquiphant M FTL50(H), FTL51(H)
10 Endress+Hauser
With M12x1 connector 52010285 / 52024216 (without LEDs)
With M12x1 connector 52018763 (with LEDs)
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 100 μA
Connectable load • Load switched via the transistor and separate PNP connection, max. 55 V DC
• Load current max. 350 mA (pulsed overload and short-circuit protection)
• Residual current < 100 μA (with transistor blocked)
• Capacitive load max. 0.5 μF at 55 V, max. 1.0 μF at 24 V
• Residual voltage < 3 V (with transistor switched through)
L00-FTL5xxxx-16-05-
xx-xx-002
IL
< 100 μA
L00-FTL2xxxx-07-05-
xx-xx-000
Safety mode Level Output signal LEDs
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-010
L00-FTL5xxxx-16-05-
xx-xx-001
IL
< 100 μA
L00-FTL2xxxx-07-05-
xx-xx-000
Safety mode Level Output signal LEDs
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-011
rd
ye
gn
Max.
Min.
L+ –
12
I
L
I
L
< 100 µA
< 100 µA
L+ –
12
L+ –
14
L+ –
14
ye 1
ye 2 gn
Max.
Min.
L+ –
12
I
L
I
L
< 100 µA
< 100 µA
L+ –
12
L+ –
14
L+ –
14

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 11
Electronic insert FEL54 (AC/DC with relay output)
Power supply Supply voltage: 19…253 V AC, 50/60 Hz or 19…55 V DC
Power consumption: max. 1.3 W
Reverse polarity protection
Overvoltage protection FEL54: overvoltage category III
Electrical connection Universal current connection with relay output
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: relay de-energised
Connectable load • Loads switched via 2 floating change-over contacts (DPDT)
• I~ max. 6 A (EEx d 4 A), U~ max. 253 V AC; P~ max. 1500 VA, cos ϕ= 1, P~ max. 750 VA, cos ϕ> 0.7
•I%max. 6 A (EEx d 4 A) to 30 V, I%max. 0.2 A to 125 V
• When connecting a low-voltage circuit with double isolation according to IEC 1010 the following applies:
total of voltages of relay output and power supply max. 300 V
Power supply:
Please note the different voltage ranges
for AC and DC.
Output:
When connecting an instrument with
high inductance, provide a spark arrester
to protect the relay contact.
A fine-wire fuse (depending on the
load connected) protects the relay
contact on short-circuiting.
Both relay contacts switch simultaneously.
* When jumpered, the relay
output works with NPN logic.
** See below "Connectable load"
L00-FTL5xxxx-04-05-xx-xx-002
L1
L+
a
NO
a
NO
u
C
u
C
N
L–
r
NC
r
NC
0.5 A
PE
(Ground)
*
** **
12 678345
FEL54
U~ 19…253 V AC, 50/60 Hz
U– 19… 55 V DC
...
Safety mode Level Output signal LEDs
green red
L00-FTL2xxxx-07-05-
xx-xx-001
= relay energised
= relay de-energised
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-005
Max.
Min.
354
354
687
687
354
354
687
687

Liquiphant M FTL50(H), FTL51(H)
12 Endress+Hauser
Electronic insert FEL55 (8/16 mA)
Power supply Supply voltage: 11...36 V DC
Power consumption: < 600 mW
Reverse polarity protection
Overvoltage protection FEL55: overvoltage category III
Electrical connection Two-wire connection for separate switching unit
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 3.6 mA
Connectable load • R = (U - 11 V) : 16.8 mA
• U = connection voltage: 11…36 V DC
Example:
PLC with 250 Ωloop powered input
250 Ω= (U – 11V) / 16, 8 mA
4,2 [Ω/Α] = U – 11 V
U = 15,2 V
For connecting to programmable
logic controllers (PLC).
AI module 4...20 mA to EN 61131-2.
Output signal jump from high to low
current on limit.
L00-FTL5xxxx-04-05-xx-en-000
12
1 2
FEL55
FEL55
–
–
EEx ia
EEx ia
+
+
E
E
X
X
E
E
X
X
U– 1
U– 1
1…36 V DC
1…36 V DC
...
...
e.g. PLC
e.g. PLC
Safety mode Level Output signal LEDs
green red
~ 16 mA
~8mA
L00-FTL2xxxx-07-05-
xx-xx-000
= 16 mA ± 5 %
= 8 mA ± 6 %
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-006
Max.
Min.
+
21
+
21
+
21
+
21
~16 mA
~8 mA
~8 mA
~16 mA

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 13
Electronic insert FEL56 (NAMUR L-H edge)
Power supply Power consumption: < 6 mW bei I < 1 mA; < 38 mW bei I = 2,2...4 mA
Connection data interface: IEC 60947-5-6
Electrical connection Two-wire connection for separate switching unit
Output signal
Signal on alarm Output signal in the event of damaged sensor: > 2.2 mA
Connectable load • See Technical Data of isolating amplifier connected according to IEC 60947-5-6 (NAMUR)
For connecting to isolating amplifiers
acc. to NAMUR (IEC 60947-5-6),
e.g. FXN421, FXN422, FTL325N,
FTL375N or Commutec SIN100,
SIN110 from Endress+Hauser.
Output signal jump from low
to high current on limit.
(L-H edge)
Connecting to multiplexer:
Set clock time to min. 2 s.
L00-FTL5xxxx-04-05-xx-en-004
12
FEL56
–
EEx ia
H
L
+
E
X
E X
I
Isolating amplifier
to
(NAMUR)
IEC 60947-5-6
Safety mode Level Output signal LEDs
green red
L00-FTL5xxxx-07-05-
xx-xx-002
= lit
= flashes
= unlit
L00-FTL5xxxx-04-05-xx-xx-003
Max.
Min.
+
21
+
21
+
21
+
21
0.6 …
1.0 mA
0.6 …
1.0 mA
2.2 …
2.8 mA
2.2 …
2.8 mA

Liquiphant M FTL50(H), FTL51(H)
14 Endress+Hauser
Electronic insert FEL58 (NAMUR H-L edge)
Power supply Power consumption: < 6 mW bei I < 1 mA; < 38 mW bei I = 2,2...4 mA
Connection data interface: IEC 60947-5-6
Electrical connection Two-wire connection for separate switching unit
Output signal
Signal on alarm Output signal in the event of damaged sensor: < 1.0 mA
Connectable load • See Technical Data of isolating amplifier connected according to IEC 60947-5-6 (NAMUR)
• Connection also to isolating amplifiers which have special safety circuits (I > 3.0 mA)
For connecting to isolating amplifiers
acc. to NAMUR (IEC 60947-5-6),
e.g. FXN421, FXN422, FTL325N,
FTL375N or Commutec SIN100,
SIN110 from Endress+Hauser.
Output signal jump from high
to low current on limit.
(H-L edge)
Additional function:
Test key on the electronic insert.
Pressing the key breaks the connection
to the isolating amplifier.
!Note!
For Ex-d applications, the additional function
can only be used if the housing is not exposed
to an explosive atmosphere.
Connecting to multiplexer:
Set clock time to min. 2 s.
L00-FTL5xxxx-04-05-xx-en-002
12
FEL58
–
EEx ia
H
L
+
E
X
E X
I
Isolating amplifier
to
(NAMUR)
IEC 60947-5-6
Safety mode Level Output signal LEDs
green yellow
L00-FTL5xxxx-07-05-
xx-xx-002
= lit
= flashes
= unlit
L00-FTL5xxxx-04-05-xx-xx-007
Max.
Min.
+
21
+
21
+
21
+
21
2.2 …
3.5 mA
2.2 …
3.5 mA
0.6 …
1.0 mA
0.6 …
1.0 mA

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 15
Electronics FEL58 (NAMUR H-L edge,
in compact housing)
Power supply Power consumption: < 6 mW bei I < 1 mA; < 38 mW bei I = 2,2...4 mA
Connection data interface: IEC 60947-5-6
Electrical connection Two-wire connection for separate switching unit
Output signal
Signal on alarm Output signal in the event of damaged sensor: < 1.0 mA
Connectable load • See Technical Data of isolating amplifier connected according to IEC 60947-5-6 (NAMUR)
• Connection also to isolating amplifiers which have special safety circuits (I > 3.0 mA)
For connecting to isolating
amplifiers acc. to
NAMUR (IEC 60947-5-6),
e.g. FXN421, FXN422,
FTL325N, FTL375N
or Commutec SIN100,
SIN110 from Endress+Hauser.
Output signal jump from high
to low current on limit.
(H-L edge)
Additional function:
If the test magnet is held
against the marking on the
nameplate, the output signal
is inverted.
Connecting to multiplexer:
Set clock time to min. 3 s.
The NAMUR interface has
a defined power consumption.
Thus, it is not possible to use
the M12 connector with
integrated LED (52018763).
L00-FTL5xxxx-04-05-xx-en-009
–+
–+
2
(WT)
1
(BN)
3
(BU)
4
(BK)
2
(WT)
1
(BN)
3
(BU)
4
(BK)
–
+
–
+
1
3
12
–+–+
1
(BU)
3
(BN)
1
(BU)
2
(BK)
MAX MIN
52018763
52010285 / 52024216
FTL5#(H)- #######N3#
(M12x1)
FTL5#(H)- #######N3#
(M12x1)
FTL5#(H)- #######D3#
(Pg11)
FTL5#(H)- #######E3#
(NPT ½")
FTL5#(H)- #######C3#
Connector
or
Safety mode Level Output signal LEDs
green yellow
L00-FTL5xxxx-07-05-
xx-xx-002
= lit
= flashes
= unlit
L00-FTL5xxxx-04-05-xx-xx-007a
Max.
Min.
+–
13
+–
12
2.2…
3.5 mA
2.2…
3.5 mA
0.6…
1.0 mA
0.6…
1.0 mA
+–
13
+–
12

Liquiphant M FTL50(H), FTL51(H)
16 Endress+Hauser
Electronic insert FEL57 (PFM)
Power supply Supply voltage: 9,5...12,5 V DC
Current consumption: 10...13 mA
Power consumption: < 150 mW
Reverse polarity protection
Electrical connection Two-wire connection for separate switching unit
For connecting to switching units
Nivotester FTL320, FTL325P,
FTL370, FTL372, FTL375P
(also with cyclical checking)
Commutec SIF101, SIN111
from Endress+Hauser.
Output signal jump of 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,
Germany.
The following can be switched at the
electronic insert:
– Standard (STD):
for low corrosive liquids;
simulation approx. 8 s
tuning fork exposed – covered – exposed.
– Extended (EXT):
for highly corrosive liquids;
simulation approx. 41 s
tuning fork exposed – covered – corroded –
exposed.
The check is activated and monitored at the
switching unit. L00-FTL5xxxx-04-05-xx-en-003
–+
78
33 34
37 38
d4 d2
z6 d6
z4 z2
21
PFM
50 /
150 Hz
E
X
E X
12
FEL57
EEx ia
Nivotester
FTL320
FTL325P 1CH
FTL325P 3CH
FTL370/372
FTL375P 1CH
Input 1
FTL372
FTL375P 2CH
Input 2
FTL375P 3CH
Input 3
Commutec S
SIF101, SIF111

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 17
Switching behaviour of the connected device:
Please note this switching response and function of the plant, especially when replacing a Liquiphant with an
EL17Z or FEL37 electronic insert by a Liquiphant M with the FEL57 electronic insert.
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: 0 Hz
Connectable load • Floating relay contacts in the connected switching unit Nivotester FTL320, FTL325P, FTL370, FTL372,
FTL375P or Commutec SIF101, SIF111
• For contact load see the Technical Data of the switching unit
L00-FTL5xxxx-05-05-xx-en-000
* De-energised on power supply failure
Fail-safe mode
set at
switching unit
Max.
Max.
Max.
Max.
Min.
Min.
Min.
Min.
Setting
at FEL57
STD
EXT
STD
EXT
STD
EXT
STD
EXT
Fork
free
free
covered
covered
free
free
covered
covered
Switching status of relay in switching unit
on = energised off = de-energised
Test start End of test start
(power off) (power on)
>3s
on
on
off
off
off
off
on
on
off
off
off
off
~3son
~3son
~3son
~3son
~5soff
~5soff
off
off
~5soff
~7soff
~5soff
~5soff
~2son
~2son
~3son
on
~35son ~3soff
~2soff
~35soff
off
~30son
on
on
on
off
*
*
*
*
Safety mode Level Output signal
(PFM)
LEDs
green yellow
L00-FTL2xxxx-07-05-
xx-xx-000
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-008
150 Hz
50 Hz

Liquiphant M FTL50(H), FTL51(H)
18 Endress+Hauser
Electronic insert FEL50A (PROFIBUS PA)
Electrical connection Two-wire connection for power supply and data transfer
L00-FTL5xxxx-04-05-xx-en-006
For connecting to PROFIBUS PA
Additional functions:
– Digital communication enables the
representation, reading and editing
of the following parameters:
Fork frequency, switch-on frequency,
switch-off frequency, switch-on time and
switch-off time, status, measured value,
density switch.
– Matrix locking possible
– Switch to WHG mode possible
(WHG approval).
– For a detailed description see BA198F
– You can also visit
www.profibus.com for more information
L00-FTL5xxxx-04-05-xx-en-005
PA– PA+
PROFIBUS PA
–
–
–
–
E
X
E X
U– 9…32 V DC
...
12
FEL50A
Segment coupler
PLC
PROFIBUS DP
PROFIBUS PA
E
X
E X
PC with Commuwin II
Proficard or Profiboard
Segment coupler

Liquiphant M FTL50(H), FTL51(H)
Endress+Hauser 19
Output signal
Signal on alarm • Failure information can be opened using the following interfaces:
Yellow LED flashing, status code, diagnostic code; see BA198F
Setting Level LEDs
green yellow
FEL50A
L00-FTL2xxxx-07-05-
xx-xx-000
not
inverted
L00-FTL5xxxx-04-05-xx-xx-009
OUT_D = 0
PA bus signal
OUT_D = 1
PA bus signal
= lit inverted
OUT_D = 1
PA bus signal
= unlit
OUT_D = 0
PA bus signal

Liquiphant M FTL50(H), FTL51(H)
20 Endress+Hauser
Connection and function
Connecting cables • Electronic inserts: cross-section max. 2.5 mm2; strand in ferrule to DIN 46228
• Protective earth in housing: cross-section max. 2.5 mm2
• External equipotential bonding connection on housing: cross-section max. 4 mm2
Fail-safe mode Minimum/maximum residual current safety selectable on electronic insert
(with FEL57 on Nivotester only)
Max. = maximum safety:
The output switches to the power fail response when the fork is covered
For use with overfill protection for example
Max. = minimum safety:
The output switches to the power fail response when the fork is exposed
For use with dry running protection for example
Switching time When fork is covered: approx. 0.5 s
When fork is exposed: approx. 1.0 s
Other switching times on request
Additionally configurable for PROFIBUS PA: 0.5...60 s
Switch-on behaviour When switching on the power supply, the output assumes the alarm signal.
After max. 3 s it assumes the correct switching mode (Exception: FEL57)
Performance characteristics
Reference operating
conditions
Maximum measured error Specified by mounting position: max. +/–1 mm
Repeatability 0.1 mm
Hysteresis Approx. 2 mm
Influence of medium
temperature
Max. +1.8…–2.8 mm (–50…+150 °C)
Influence of product density Max. +4.8…–3.5 mm (0.5…1.5 g/cm3)
Influence of medium pressure Max. 0…–2.5 mm (–1…64 bar)
Ambient temperature: 23 °C
Medium temperature: 23 °C
Product density: 1 g/cm3(water)
Viscosity: 1 mm2/s
Medium pressure pe: 0 bar
Sensor mounting: vertical from above
Density switch: to > 0.7
L00-FTL5xxxx-06-05-xx-en-000
13 mm
Switchpoint
for
reference conditions