Endress+Hauser FTL50H, FTL51H, FTL51, FTL50 Specifications
TI00328F/00/EN/17.17
71379381
Products Solutions Services
Technical Information
Liquiphant M
FTL50, FTL51, FTL50H, FTL51H
Vibronic
Point level switch for all kinds of liquids
Application
• Process temperatures from –50 °C to 150 °C (-58 to 302 °F)
• Pressures up to 100 bar (1450 psi)
• Viscosities up to 10,000 mm/s (cSt)
• For liquids with densities 0.5 g/cm
FTL50: Compact design
FTL51: Extension pipe up to 3 m (9.8 ft) and up to 6 m (20 ft) on request
FTL50H, FTL51H:
Ideal substitute for float switches, as reliable function not affected by flow, turbulence,
bubbles, foam, vibration, solids content or buildup.
Your benefits
• Recommended for safety systems requiring functional safety to SIL2/SIL3 as per IEC
61508/IEC 61511-1
• Design in accordance with ASME B31.3
• Recommended for use in sterile applications in the life science industry
(design in accordance with ASME BPE)
• No adjustment: quick, low-cost startup
• No mechanically moving parts: no maintenance, no wear, long operating life
• Functional safety: Monitoring of tuning fork for damage
• Compact stainless steel housing (optional): the IP69 protection rating guarantees
that the unit remains impermeable, even in the event of intensive cleaning or
flooding for several hours
Certified for the food and pharmaceutical industries
(SGU)
Table of contents
Liquiphant M FTL50(H), FTL51(H)
Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Point level detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Function and system design . . . . . . . . . . . . . . . . . . . . . .4
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Modularity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electronic versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electronics for continuous density measurement . . . . . . . . . . . 5
Galvanic isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Measuring range (detection range) . . . . . . . . . . . . . . . . . . . . . . 5
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) . . . . . . . .8
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electronic insert FEL52 (DC PNP). . . . . . . . . . . . . . . . 10
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electronic insert FEL56 (NAMUR L-H edge) . . . . . . . 15
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electronic insert FEL58 (NAMUR H-L edge) . . . . . . . 16
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electronics FEL58 (NAMUR H-L edge, compact
housing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electronic insert FEL57 (PFM) . . . . . . . . . . . . . . . . . . 18
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electronic insert FEL50A (PROFIBUS PA) . . . . . . . . . 20
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electronics FEL52 (DC PNP, in compact housing) . . 11
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electronic insert FEL50D (density). . . . . . . . . . . . . . . 22
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Light signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electronic insert FEL54 (AC/DC with relay output). 13
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electronic insert FEL55 (8/16 mA) . . . . . . . . . . . . . . 14
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Connection and function . . . . . . . . . . . . . . . . . . . . . . . 24
Connecting cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Safety mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Switching time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Switch-on behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Performance characteristics . . . . . . . . . . . . . . . . . . . . 24
Reference operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . 24
Maximum measured error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2 Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
Influence of medium temperature . . . . . . . . . . . . . . . . . . . . . . . 24
Influence of medium density . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Influence of medium pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Switching delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Operating conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Examples of mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Installation height as per
IEC61010-1 Ed.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Medium conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Medium temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Thermal shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Medium pressure pe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Test pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
State of aggregation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Solids content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Lateral loading capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Weld-in adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Lap joint flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Lap joint flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Sliding sleeves for unpressurized operation . . . . . . . . . . . . . . . 54
High pressure sliding sleeves . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Cover with sight glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Cover with sight glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Circular connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Functional safety (SIL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Safety Instructions (NEPSI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Control Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
System information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . . 30
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Materials and surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Process connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Human interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Electronic inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Compact housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Operating concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Certificates and approvals . . . . . . . . . . . . . . . . . . . . . . 41
CE mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
RCM-tick mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
EAC conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
CRN approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Pressure Equipment Directive 2014/68/EU (PED) . . . . . . . . . 41
Process seal according to ANSI/ISA 12.27.01 . . . . . . . . . . . . . 42
General approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Other certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Manufacturer declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Use in hazardous zones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
ASME B 31.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Pressure equipment directive . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Product structure for Liquiphant M FTL50, FTL51 . . . . . . . . . 44
Product structure for Liquiphant M FTL50H, FTL51H . . . . . . 48
3 Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
FEL51/52/54
…
…
FEL55/56/57/58/50A
Ex i
E
X
E
X
Switching unit
PLC
Isolating
amplifier
Segment
coupler
Application
Point level 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.
This change in frequency causes the point level switch to switch.
Modularity
Point level switch
Liquiphant M FTL with electronic versions
FEL51, FEL52, FEL54
L00-FTL5xxxx-15-05-xx-xx-000
Point level switch
Liquiphant M FTL with electronic versions
FEL55, FEL56, FEL57, FEL58
for connecting to a separate switching unit
or an isolating amplifier FEL50A
for connecting to a PROFIBUS PA segment
4 Endress+Hauser
L00-FTL5xxxx-15-05-xx-en-000
Liquiphant M FTL50(H), FTL51(H)
Electronic versions FEL51:
Two-wire AC version;
Switches the load directly into the power supply circuit via an electronic switch.
FEL52:
Three-wire DC version;
Switches the load via the transistor (PNP) and separate connection e.g. in conjunction with
programmable logic controllers (PLCs), DI modules as per EN 61131-2.
FEL54:
Universal current version with relay output;
Switches the loads via 2 floating change-over contacts.
FEL55:
Signal transmission 16/8 mA on two-wire cabling e.g. in conjunction with programmable logic
controllers (PLCs), AI modules 4 to 20 mA as per EN 61131-2.
FEL56:
For separate switching unit; signal transmission L-H edge 0.6 to 1.0 / 2.2 to 2.8 mA
to EN 50227 (NAMUR) on two-wire cabling.
FEL58:
For separate switching unit; signal transmission H-L edge 2.2 to 3.5 / 0.6 to 1.0 mA
to EN 50227 (NAMUR) on 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.
Proof test 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
Electronics for continuous density measurement
Galvanic isolation FEL51, FEL52, FEL50A: between sensor and power supply
Design FTL50: Compact
FEL50D:
For connecting to Density Computer FML621
FEL54: between sensor and power supply and load
FEL55, FEL56, FEL57, FEL58, FEL50D: see connected switching unit
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: dependent on mounting point
FTL51: dependent on mounting point and the extension pipe ordered.
Standard extension pipe up to 3 m (9.8 ft) and up to 6 m (20 ft) on request.
Density Setting on the electronic insert > 0.5 g/cm (SGU) or > 0.7 g/cm (SGU) (others on request)
Endress+Hauser 5
Electronic insert FEL51 (AC 2-wire)
L1
U~ max. 253 V AC
50/60 Hz
NNPE
(Ground)
1A
min.
19 V
12
FEL51
*
R
*
External load R
be connectedmust
MAX
MIN
Power supply Supply voltage: AC 19 to 253 V
Power consumption: < 0.83 W
Residual current consumption: < 3.8 mA
Short-circuit protection
Overvoltage protection FEL51: overvoltage category III
Electrical connection Two-wire AC connection
Switches the load directly into the power supply
circuit via an electronic switch.
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-energize with holding
power below 3.8 mA.
If this is the case, a resistor should be
connected parallel to the relay. An RC module is
available under the part number: 71107226
• When selecting the relay, pay attention to the
holding power
/ rated power
(see "Connectable load")
Liquiphant M FTL50(H), FTL51(H)
L00-FTL5xxxx-04-05-xx-en-007
Output signal
I
L
= load current
Safety mode Level Output signal LEDs
(switched through)
< 3.8 mA
= residual current
(blocked)
= lit
= unlit
L00-FTL2xxxx-07-05-
xx-xx-000
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 3.8 mA
Connectable load • Voltage drop via FEL51
12 V
• Residual current if electrical switch is blocked:
3.8 mA
• Load switched directly into the power supply circuit via the thyristor.
Transient (40 ms)
1.5 A, 375 VA at 253 V or 36 VA at 24 V (not short-circuit-proof)
The load is switched via an electronic switch directly in the power circuit.
Always connect in series with a load!
Not suitable for connection to low-voltage PLC inputs!
green red
L00-FTL5xxxx-04-05-xx-xx-001
6 Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
2.7
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
20 24 27 43 48 53 60 110 121 207 230 253
P/S
U
P1
Selection guide for relays
TI00328F_001
Minimum nominal power of load
P/S nominal power in [W] / [VA]
U operating voltage in [V]
Position Operating voltage Nominal power
min. max.
P1
AC operation
24 V
110 V
230 V
> 1.3 VA
> 1.5 VA
> 2.5 VA
< 8.4 VA
< 38.5 VA
< 80.5 VA
Relays with less nominal power can be operated via an RC module connected in parallel (optional).
Endress+Hauser 7
Electronics FEL51 (AC, in compact housing)
(Ground)
1
(BU)
3
(BN)
R
1.0 A
L1
N
PE
> 19 V
(Ground)
1
(BU)
2
(BK)
R
1.0 A
L1
N
PE
> 19 V
(GN/YE) (GN/YE)
1
3
1
2
FTL5#(H)- #######D3#
(Pg11)
FTL5#(H)- #######E3#
(NPT ½")
FTL5#(H)- #######C3#
(Ground)
R
1.0 A
L1
N
PE
> 19 V
(Ground)
R
1.0 A
L1
N
PE
> 19 V
oder
-30°C ≤ TA ≤ +70°C
-°≤TA≤+ °22 F 158 F
MAX
MIN
1 3
1 2
1 2
I
L
I
L
< 3.8 mA
< 3.8 mA
1 3
Power supply Supply voltage: AC 19 to 253 V
Power consumption: < 0.83 W
Residual current consumption: < 3.8 mA
Short-circuit protection
Overvoltage protection FEL51: overvoltage category III
Electrical connection Two-wire AC connection
Switches the load directly into the
power supply circuit via an
electronic switch.
Always connect in series with a
load!
Check the following:
• The residual current in blocked
state (up to 3.8 mA)
• That for low connection voltage
Liquiphant M FTL50(H), FTL51(H)
Connector MAX MIN
– 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-energize with holding power below 3.8 mA.
If this is the case, a resistor should be connected parallel to the relay (e.g. RC module: part number
71107226).
• When using in conjunction with a cable end (FTL5#(H)- #######C3#), the compact housing
should only be used in enclosed areas.
Output signal
I
L
< 3.8 mA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 3.8 mA
Safety mode Level Output signal LEDs
L00-FTL5xxxx-04-05-xx-xx-012
green red
L00-FTL5xxxx-04-05-xx-xx-001a
8 Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
2.7
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
20 24 27 43 48 53 60 110 121 207 230 253
P/S
U
P1
Connectable load • Voltage drop via FEL51 12 V
• Residual current if electrical switch is blocked: 3.8 mA
• Load switched directly into the power supply circuit via the thyristor.
Transient (40 ms)
1.5 A, 375 VA at 253 V or 36 VA at 24 V (not short-circuit-proof)
The load is switched via an electronic switch directly in the power circuit.
Always connect in series with a load!
Not suitable for connection to low-voltage PLC inputs!
Selection guide for relays
Minimum nominal power of load
P/S nominal power in [W] / [VA]
U operating voltage in [V]
Position Operating voltage Nominal power
P1
AC operation
Relays with less nominal power can be operated via an RC module connected in parallel (optional).
Endress+Hauser 9
24 V
110 V
230 V
> 1.3 VA
> 1.5 VA
> 2.5 VA
TI00328F_001
min. max.
< 8.4 VA
< 38.5 VA
< 80.5 VA
Electronic insert FEL52 (DC PNP)
1 2 3
(+)
FEL52
L+
L–
–
0.5 A
U– 10…55 V DC
...
Relais,
PLC, ...
PE
(Ground)
R
MAX
MIN
L+ +
1 3
L+ +
1 3
1 3
1 3
I
L
I
L
< 100 μA
< 100 μA
Power supply Supply voltage: DC 10 to 55 V
1.7 V, 0 to 400 Hz
Ripple:
Current consumption: 15 mA
Power consumption: 0.83 W
Reverse polarity protection
Overvoltage protection FEL52: overvoltage category III
Electrical connection Three-wire DC connection
Switches the load via the transistor (PNP) and
separate connection.
Preferably used with programmable logic
controllers (PLC),
DI modules as per EN 61131-2.
Positive signal at switching output of the
electronics (PNP); Output blocked on reaching
point level.
Liquiphant M FTL50(H), FTL51(H)
L00-FTL5xxxx-04-05-xx-xx-030
Output signal
Safety mode Level Output signal LEDs
green red
I
L
= load current
(switched through)
< 100 μA
= residual current
(blocked)
= lit
= unlit
L00-FTL2xxxx-07-05-
xx-xx-000
L00-FTL5xxxx-04-05-xx-xx-004
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,
•Load current
DC 55 V
350 mA (pulsed overload and short-circuit protection)
• Residual current < 100 μA (with transistor blocked).
• Capacitance load 0.5 μF at 55 V, 1.0 μF at 24 V
10 Endress+Hauser
• Residual voltage < 3 V (with transistor switched through);
Liquiphant M FTL50(H), FTL51(H)
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
oder
-30°C ≤ TA ≤ +70°C
-°C≤TA≤+ °C22 158
MAX
MIN
L+ +
3 2
I
L
I
L
< 100 μA
< 100 μA
L+ +
3 2
L+ +
2 3
L+ +
2 3
Electronics FEL52 (DC PNP, in compact housing)
Power supply Supply voltage: DC 10 to 55 V
1.7 V, 0 to 400 Hz
Ripple:
Current consumption: 15 mA
Power consumption: 0.83 W
Reverse polarity protection
Overvoltage protection FEL52: overvoltage category III
Electrical connection Three-wire DC connection
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 point
level.
Note!
When using in conjunction with a
cable end (FTL5#(H)#######C3#), the compact
housing should only be used in
enclosed areas.
Connector MAX MIN
Output signal With valve connector or cable tail
Endress+Hauser 11
I
L
< 100 μA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL5xxxx-04-05-xx-xx-014
Safety mode Level Output signal LEDs
green red
L00-FTL5xxxx-04-05-xx-xx-004a
With M12x1 connector 52010285 / 52024216 (without LEDs)
rd
ye
gn
MAX
MIN
L+ –
1 2
I
L
I
L
< 100 μA
< 100 μA
L+ –
1 2
L+ –
1 4
L+ –
1 4
ye 1
ye 2
gn
MAX
MIN
L+ –
1 2
I
L
I
L
< 100 μA
< 100 μA
L+ –
1 2
L+ –
1 4
L+ –
1 4
Safety mode Level Output signal LEDs
L00-FTL5xxxx-16-05-
xx-xx-002
Liquiphant M FTL50(H), FTL51(H)
I
L
< 100 μA
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
L00-FTL2xxxx-07-05-
xx-xx-000
With M12x1 connector 52018763 (with LEDs)
Safety mode Level Output signal LEDs
L00-FTL5xxxx-16-05-
xx-xx-001
I
L
< 100 μA
= load current
(switched through)
= residual current
(blocked)
L00-FTL5xxxx-04-05-xx-xx-010
= lit
= unlit
L00-FTL2xxxx-07-05-
xx-xx-000
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,
•Load current
350 mA (pulsed overload and short-circuit protection)
DC 55 V
• Residual current < 100 μA (with transistor blocked).
• Capacitance load
0.5 μF at 55 V, 1.0 μF at 24 V
• Residual voltage < 3 V (with transistor switched through);
L00-FTL5xxxx-04-05-xx-xx-011
12 Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
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
...
MAX
MIN
354
354
687
687
354
354
687
687
Electronic insert FEL54 (AC/DC with relay output)
Power supply Supply voltage: AC 19 to 253 V, 50/60 Hz or DC 19 to 55 V
Power consumption:
Reverse polarity protection
Overvoltage protection FEL54: overvoltage category III
Electrical connection Universal current connection with relay output
Power supply:
Please note the different
voltage ranges for AC and DC.
AC.
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.
1.3 W
Output signal
* When jumpered, the relay
output works with NPN logic.
** See "Connectable load"
= relay energized
= relay de-energized
= lit
= unlit
L00-FTL2xxxx-07-05-
xx-xx-001
L00-FTL5xxxx-04-05-xx-xx-002
Safety mode Level Output signal LEDs
green red
L00-FTL5xxxx-04-05-xx-xx-005
Signal on alarm Output signal on power failure or in the event of damaged sensor: relay de-energized
Connectable load • Loads switched via 2 floating change-over contacts (DPDT).
Endress+Hauser 13
6 A (Ex de 4 A), U~ AC 253 V; P~ 1500 VA, cos = 1, P~ 750 VA, cos > 0.7
•I~
6 A (Ex de 4 A) to DC 30 V , I% 0.2 A to 125 V
•I%
• When connecting a low-voltage circuit with double insulation according to IEC 1010, the following
applies: the sum of the voltages of the relay output and power supply is 300 V
• The electronic insert FEL52 DC-PNP is preferred for low DC load currents (e.g. when connecting to
a PLC)
• Relay contact material: silver/nickel AgNi 90/10
Electronic insert FEL55 (8/16 mA)
1 2
FEL55
–
Ex ia
+
E
X
E
X
U 11...36 V DC
–
+
–
+
R
R =
max
U–11 V
16.8 mA
PLC/SPS,
AI-Modules, ...
F=T50mA
MMAX
MIN
+
2 1
+
2 1
+
2 1
+
2 1
~16 mA
~8 mA
~8 mA
~16 mA
Power supply Supply voltage: DC 11 to 36 V
Power consumption: < 600 mW
Reverse polarity protection
Overvoltage protection FEL55: overvoltage category III
Electrical connection Two-wire connection for separate switching unit
For separate switching unit.
Signal transmission 16/8 mA on two-wire cabling.
For connection to programmable logic controllers
(PLC) for example, AI modules 4 to 20 mA to
EN 61131-2.
Output signal jump from high to low current on
point level.
Fuse required for non-Ex applications!
Only use power units with safe galvanic isolation (e.g.
SELV).
Liquiphant M FTL50(H), FTL51(H)
Output signal
~ 16 mA
~8 mA
= 16 mA ± 5 %
= 8 mA ± 6 %
Safety mode Level Output signal LEDs
= lit
= unlit
L00-FTL2xxxx-07-05-
xx-xx-000
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: DC 11 to 36 V (in wet environments DC 11 to 35 V)
Example: PLC with 250 with 2-wire version
250 = (U – 11V) / 16.8 mA
4.2 [/] = U – 11 V
U = 15.2 V
L00-FTL5xxxx-04-05-xx-en-000
green red
L00-FTL5xxxx-04-05-xx-xx-006
14 Endress+Hauser
Liquiphant M FTL50(H), FTL51(H)
12
FEL56
–
EEx ia
H
L
+
E
X
E
X
I
Isolating amplifier
to
(NAMUR)
IEC 60947-5-6
MAX
MIN
+
2 1
+
2 1
+
2 1
+
2 1
0.6 …
1.0 mA
0.6 …
1.0 mA
2.2 …
2.8 mA
2.2 …
2.8 mA
Electronic insert FEL56 (NAMUR L-H edge)
Power supply Supply voltage: DC 8.2 V ±20 %
Power consumption: < 6 mW at I < 1 mA; < 38 mW at I = 2.8 mA
Connection data interface: IEC 60947-5-6
Electrical connection Two-wire connection for separate switching unit
For connecting to isolating amplifiers acc. to
NAMUR (IEC 60947-5-6), e.g. FTL325N,
FTL375N from Endress+Hauser.
Output signal jump from low to high current on
point level.
(L–H edge)
Connecting to multiplexer:
Set clock time to min. 2 s.
Output signal
Safety mode Level Output signal LEDs
= lit
= flashes
= unlit
L00-FTL5xxxx-07-05-
xx-xx-002
Signal on alarm Output signal in the event of damaged sensor: > 2.2 mA
Connectable load • See Technical Data of the isolating amplifier connected according to IEC 60947–5–6 (NAMUR)
L00-FTL5xxxx-04-05-xx-en-004
green red
L00-FTL5xxxx-04-05-xx-xx-003
Endress+Hauser 15
Electronic insert FEL58 (NAMUR H-L edge)
12
FEL58
–
EEx ia
H
L
+
E
X
E
X
I
Isolating amplifier
to
(NAMUR)
IEC 60947-5-6
MAX
MIN
+
2 1
+
2 1
+
2 1
+
2 1
2.2 …
3.5 mA
2.2 …
3.5 mA
0.6 …
1.0 mA
0.6 …
1.0 mA
Power supply Supply voltage: DC 8.2 V ±20 %
Power consumption: < 6 mW at I < 1 mA; < 38 mW at I = 3.5 mA
Connection data interface: IEC 60947-5-6
Electrical connection Two-wire connection for separate switching unit
For connecting to isolating amplifiers
as per NAMUR (IEC 60947-5-6), e.g. FTL325N,
FTL375N from Endress+Hauser.
Output signal jump from high to low current on
point level.
(H–L edge)
Additional function:
Test key on the electronic insert.
Pressing the key breaks the connection to the
isolating amplifier.
Note!
!
In Ex–d applications, the additional function
can only be used if the housing is not exposed
to an explosive atmosphere.
Liquiphant M FTL50(H), FTL51(H)
Output signal
Connecting to multiplexer:
Set clock time to min. 2 s.
= lit
= flashes
= unlit
L00-FTL5xxxx-07-05-
xx-xx-002
L00-FTL5xxxx-04-05-xx-en-002
Safety mode Level Output signal LEDs
green
yellow
L00-FTL5xxxx-04-05-xx-xx-007
Signal on alarm Output signal in the event of damaged sensor: < 1.0 mA
Connectable load • See Technical Data of the isolating amplifier connected according to IEC 60947–5–6 (NAMUR)
16 Endress+Hauser
• Connection also to isolating amplifiers which have special safety circuits (I > 3.0 mA)
Liquiphant M FTL50(H), FTL51(H)
–+
–
+
2
(WT)
1
(BN)
3
(BU)
4
(BK)
2
(WT)
1
(BN)
3
(BU)
4
(BK)
–
+
–
+
1
3
1
2
–
+
3
(BN)
1
(BU)
2
(BK)
52018763
52010285 / 52024216
FTL5#(H)- #######N3#
(M12x1)
FTL5#(H)- #######N3#
(M12x1)
FTL5#(H)- #######D3#
(Pg11)
FTL5#(H)- #######E3#
(NPT½")
FTL5#(H)- #######C3#
-30°C ≤ TA ≤ +70°C
-°≤TA≤+ °22 F 158 F
+
––
1
(BU)
MAX
MIN
+–
1 3
+–
1 2
2.2…
3.5 mA
2.2…
3.5 mA
0.6…
1.0 mA
0.6…
1.0 mA
+–
1 3
+–
1 2
Electronics FEL58 (NAMUR H-L edge, compact housing)
Power supply Supply voltage: DC 8.2 V ±20 %
Power consumption: < 6 mW at I < 1 mA; < 38 mW at I = 3.5 mA
Connection data interface: IEC 60947-5-6
Electrical connection Two-wire connection for separate switching unit
Connector MAX MIN
For connecting to isolating
amplifiers acc. to NAMUR
(IEC 60947-5-6), e.g. FTL325N,
FTL375N from Endress+Hauser.
Output signal jump from high to
low current on point level.
(H–L edge)
Additional function:
If the test magnet is held against
the
marking on the nameplate,
the output signal is inverted.
Output signal
Signal on alarm Output signal in the event of damaged sensor: < 1.0 mA
Connectable load • See Technical Data of the isolating amplifier according to IEC 60947–5–6 (NAMUR)
Endress+Hauser 17
!
Connecting to multiplexer:
Set clock time to min. 3 s.
The NAMUR interface has
a defined power consumption
rate.
Thus, it is not possible to use the
M12 connector
with an integrated LED
(52018763).
L00-FTL5xxxx-04-05-xx-xx-013
Safety mode Level Output signal LEDs
green
yellow
= lit
= flashes
= unlit
L00-FTL5xxxx-07-05-
Note!
xx-xx-002
L00-FTL5xxxx-04-05-xx-xx-007a
The light emitting diodes are not readable on the version FTL5x(H)-## ## ## #C 3# (compact IP66/68
316L with a 5 m cable).
• Connection also to isolating amplifiers which have special safety circuits (I > 3.0 mA)
Electronic insert FEL57 (PFM)
– +
78
33 34
37 38
d4 d2
z6d6
z4 z2
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
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
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 “proof test”:
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):
Corrosion of the fork unlikely;
simulation approx. 8 s
tuning fork exposed – covered – exposed.
For proof testing, the Nivotester tests the
sensor's level notification function.
– Extended (EXT):
Corrosion of the fork possible;
Simulation approx. 41 s: tuning fork exposed –
covered – corroded – exposed.
For proof testing, the Nivotester tests the
sensor's level notification function and fault
notification (alarm) function.
The check is activated and monitored at the switching unit.
The twin-core connecting cable (instrument cable) with a cable resistance of
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.
Liquiphant M FTL50(H), FTL51(H)
L00-FTL5xxxx-04-05-xx-en-003
25 per core is
18 Endress+Hauser
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