Vibronic-Point level switch-Liquiphant M FTL51C

TI347F/00/en
71114954
Technical Information
Liquiphant M FTL51C
Vibronic
Point level switch for all kinds of liquids
with high corrosion-resistant coating
Application
The Liquiphant M is a point level switch which can be
used in all liquids
– for temperatures from –50 °C to 150 °C
(up to 230 °C on request)
– for pressures up to 40 bar
– for viscosity up to 10,000 mm2/s
– for densities ≥ 0.5 g/cm3
or ≥ 0.7 g/cm3
,
other settings available on request
– foam detection on request
The reliable function is not affected by flow, turbulence,
bubbles, foam, vibration, solids content or buildup. The
Liquiphant is thus the ideal substitute for float switches.
All the wetted parts of the sensor (process connection,
extension pipe and tuning fork) are coated in enamel or
various synthetic materials, making the point level
switch suitable for applications in very aggressive liquids.
International approvals certify use in hazardous areas.
Your benefits
• Use in safety systems requiring
functional safety to SIL2/SIL3 in accordance with
IEC 61508/IEC 61511-1
• Optimally adapted to the process with a wide range of
materials for corrosion-resistant coating
• Large number of process connections to choose from
– Flanges for various standards
– Universal usage
• Wide range of electronics, e.g. NAMUR, relay,
thyristor, PFM signal output: suitable connection for
every process control system
• PROFIBUS PA protocol: for commissioning and
maintenance
• No adjustment: quick, low-cost startup
• No mechanically moving parts: no maintenance
no wear, long operating life
• Monitoring of fork for damage: guaranteed function
• FDA-approved material (PFA Edlon)

Liquiphant M FTL51C
2 Endress+Hauser
Table of contents
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Point level detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Function and system design. . . . . . . . . . . . . . . . . . . . . 4
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Modularity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electronic versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electronic version for 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
Electronic insert FEL52 (DC PNP). . . . . . . . . . . . . . . . 7
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electronic insert FEL54 (AC/DC with relay output) . . 8
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electronic insert FEL55 (8/16 mA) . . . . . . . . . . . . . . . 9
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electronic insert FEL56 (NAMUR L-H edge) . . . . . . . 10
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connectable load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electronic insert FEL58 (NAMUR H-L edge) . . . . . . . 11
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electronic insert FEL57 (PFM). . . . . . . . . . . . . . . . . . 12
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electronic insert FEL50A (PROFIBUS PA) . . . . . . . . . 14
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electronic insert FEL50D (density) . . . . . . . . . . . . . . 16
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Light signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Connection and function . . . . . . . . . . . . . . . . . . . . . . 18
Connecting cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Safety mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Switching time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Switch-on behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Performance characteristics. . . . . . . . . . . . . . . . . . . . 18
Reference operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maximum measured error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Influence of medium temperature . . . . . . . . . . . . . . . . . . . . . . . 18
Influence of medium density . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Influence of medium pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installation instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Examples of mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Ambient temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3 Endress+Hauser
Liquiphant M FTL51C
Medium conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Medium temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Thermal shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Medium pressure pe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Test pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pressure shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
State of aggregation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Solids content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . 24
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Dimensions (in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Process connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Human interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Electronic inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Operating concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Certificates and approvals . . . . . . . . . . . . . . . . . . . . . 29
Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Combinations of coatings, housings and electronic inserts . . . . . . 29
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . 31
Liquiphant M FTL51C product structure . . . . . . . . . . . . . . . . . . 31
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Transparent cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Cover with sight glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Functional safety (SIL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Safety Instructions (ATEX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Safety Instructions (NEPSI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Control Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
System information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Liquiphant M FTL51C
4 Endress+Hauser
Application
Point level detection Maximum or minimum detection in tanks or pipes containing all kinds of liquids, including use in hazardous
areas. Particularly suitable for very aggressive liquids that to high level of corrosion protection.
L00-FTL51Cxx-11-05-xx-xx-001
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-FTL51Cxx-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
L00-FTL51Cxx-15-05-xx-en-000
FEL51/52/54
…
FEL55/56/57/58/50A
Ex i
…
EX EX
Switching unit
PLC
Isolating
amplifier
Segment
coupler

Liquiphant M FTL51C
Endress+Hauser 5
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.
FEL54:
Universal current version with relay output;
Switches the loads via 2 floating change-over contacts.
FEL55:
For separate switching unit; signal transmission 16/8 mA on two-wire cabling.
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.
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
Electronic version for density
measurement
FEL50D:
For connecting to Density Computer FML621
Galvanic isolation FEL51, FEL52, FEL50A:
Between sensor and power supply
FEL54:
Between sensor and power supply and load
FEL55, FEL56, FEL57, FEL58, FEL50D:
See connected switching unit
Design FTL51C:
The flange, extension pipe and tuning fork are coated.
Input
Measured variable Level (limit value)
Measuring range (detection
range)
Depends on the mounting point or the length of the sensor with an extension pipe
(up to 3000 mm for synthetic coating, and up to 1200 mm for enamel coating)
Density Adjustment on the electronic insert > 0.5 g/cm3 or > 0.7 g/cm3 (other on request)

Liquiphant M FTL51C
6 Endress+Hauser
Electronic insert FEL51 (AC 2-wire)
Power supply Supply voltage: 19 to 253 V AC
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
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 in
parallel.
• For relays with a maximum holding power/rated power < 89 VA at 253 AC or < 8.4
VA at 24 V AC
• Voltage drop across FEL51 max. 12V
• Residual current with blocked electrical switch: max. 3.8 mA.
• Load switched directly into the power supply circuit via the thyristor.
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 modification number
MVT2Y1278.
• When selecting the relay, pay attention to the hold-
ing power
/ rated power
(see "Connectable load")
L00-FTL5xxxx-04-05-xx-en-007
L1
U~ max. 253 V AC
50/60 Hz
N N PE
(Ground)
1 A
min.
19 V
1 2
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.
1 2
1 2
1 2
1 2
IL
IL
< 3.8 mA
< 3.8 mA

Liquiphant M FTL51C
Endress+Hauser 7
Transient (40 ms) max. 1.5 A, max. 375 VA at 253 V or max. 36 VA at 24 V (not short-circuit proof)
Electronic insert FEL52 (DC PNP)
Power supply Supply voltage: 10 to 55 V DC
Ripple: max. 1.7 V, 0 to 400 Hz
Current consumption: max. 15 mA
Power consumption: max. 0.83 W
Reverse polarity protection
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).
• Capacitance 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.
1 2 3
(+)
FEL52
L+ L–
–
0.5 A
U– 10…55 V DC...
e.g.
Relay
PLC
green red
IL
< 100 μA
L00-FTL2xxxx-07-05-
xx-xx-000
= load current
(switched through)
= residual current
(blocked)
= lit
= unlit
Max.
Min.
L+ +
1 3
L+ +
1 3
1 3
1 3
IL
IL
< 100 µA
< 100 µA

Liquiphant M FTL51C
8 Endress+Hauser
Electronic insert FEL54 (AC/DC with relay output)
Power supply Supply voltage: 19 to 253 V AC, 50/60 Hz or 19 to 55 V DC
Power consumption: max. 1.3 W
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-energized
Connectable load • Loads switched via 2 floating change-over contacts (DPDT).
• I~ max. 6 A (Ex de 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 (Ex de 4 A) bis 30 V DC, 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 "Connectable load"
L1
L+
a
NO
a
NO
u
C
u
C
N
L–
r
NC
r
NC
0.5 A
PE
(Ground)
*
** **
1 2 6 7 83 4 5
FEL54
U~ 19…253 V AC, 50/60 Hz
U– 19… 55 V DC...
green red
L00-FTL2xxxx-07-05-
xx-xx-001
= relay energized
= relay de-energized
= lit
= unlit
Max.
Min.
3 54
3 54
6 87
6 87
3 54
3 54
6 87
6 87

Liquiphant M FTL51C
Endress+Hauser 9
Electronic insert FEL55 (8/16 mA)
Power supply Supply voltage: 11 to 36 V DC
Power consumption: < 600 mW
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 to 36 V DC
Example:
PLC with 250 Ω with 2-wire version
250 Ω = (U – 11V) / 16.8 mA
4.2 [Ω/Α] = U – 11 V
U = 15.2 V
For connecting to
programmable logic controllers (PLCs) for example,
AI module 4 to 20 mA to EN 61131-2.
Output signal jump from high to
low current on limit.
1 21 2
FEL55FEL55
––
EEx iaEEx ia
++
EEXX
EEXX
U– 1U– 11…36 V DC1…36 V DC......
e.g. PLCe.g. PLC
green red
~ 16 mA
~ 8 mA
L00-FTL2xxxx-07-05-
xx-xx-000
= 16 mA ± 5 %
= 8 mA ± 6 %
= lit
= unlit
Max.
Min.
+
2 1
+
2 1
+
2 1
+
2 1
~16 mA
~8 mA
~8 mA
~16 mA

Liquiphant M FTL51C
10 Endress+Hauser
Electronic insert FEL56 (NAMUR L-H edge)
Power supply Power consumption: < 6 mW at I < 1 mA; < 38 mW at I = 2.8 mA
Connection data interface: IEC 60947-5-6
Output signal
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)
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
to high current on limit.
(L–H edge)
Connecting to multiplexer:
Set clock time to min. 2 s.
1 2
FEL56
–
EEx ia
H
L
+
EX
EX
I
Isolating amplifier
to
(NAMUR)
IEC 60947-5-6
green red
L00-FTL5xxxx-07-05-
xx-xx-002
= lit
= flashes
= unlit
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

Liquiphant M FTL51C
Endress+Hauser 11
Electronic insert FEL58 (NAMUR H-L edge)
Power supply Power consumption: < 6 mW at I < 1 mA; < 38 mW at I = 3.5 mA
Connection data interface: IEC 60947-5-6
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 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. FTL325N, FTL375N 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!
In 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.
1 2
FEL58
–
EEx ia
H
L
+
EX
EX
I
Isolating amplifier
to
(NAMUR)
IEC 60947-5-6
green
yellow
L00-FTL5xxxx-07-05-
xx-xx-002
= lit
= flashes
= unlit
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

Liquiphant M FTL51C
12 Endress+Hauser
Electronic insert FEL57 (PFM)
Power supply Supply voltage: 9.5 to 12.5 V DC
Current consumption: 10 to 13 mA
Power consumption: < 150 mW
For connecting to Nivotester switching units
FTL320, FTL325P, FTL370,
FTL372, FTL375P (also with
cyclical checking) from Endress+Hauser.
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):
Corrosion of the fork unlikely;
simulation approx. 8 s
tuning fork exposed – covered – exposed.
This setting tests level reporting in the Nivotester
during cyclical checking.
– Extended (EXT):
Corrosion of the fork possible;
Simulation approx. 41 s: tuning fork exposed – cov-
ered – corroded – exposed.
This setting tests level reporting and alarm notifica-
tion in the Nivotester during cyclical checking.
The check is activated and monitored at the switching
unit.
– +
7 8
33 34
37 38
d4 d2
z6 d6
z4 z2
2 1
PFM
50 /
150 Hz
EX
EX
1 2
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 FTL51C
Endress+Hauser 13
Switching behavior 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 with a Liquiphant M with an 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 device Nivotester FTL320, FTL325P,
FTL370, FTL372, FTL375P
• For contact load, see the Technical Data of the switching unit.
* De-energized 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)
> 3 s
on
on
off
off
off
off
on
on
off
off
off
off
~ 3 s on
~ 3 s on
~ 3 s on
~ 3 s on
~ 5 s off
~ 5 s off
off
off
~ 5 s off
~ 7 s off
~ 5 s off
~ 5 s off
~ 2 s on
~ 2 s on
~ 3 s on
on
~ 35 s on ~ 3 s off
~ 2 s off
~ 35 s off
off
~ 30 s on
on
on
on
off
*
*
*
*
Safety mode Level Output signal
(PFM)
LEDs
green
yellow
L00-FTL2xxxx-07-05-
xx-xx-000
= lit
= unlit
150 Hz
50 Hz

Liquiphant M FTL51C
14 Endress+Hauser
Electronic insert FEL50A (PROFIBUS PA)
Power supply Bus voltage: 9 to 32 V DC
Bus current:
• 12.5 mA +/– 1.0
mA (software version: 01.03.00, hardware version: 02.00)
• 10.5 mA +/– 1.0
mA (software version: 01.03.00, hardware version: 01.00)
Electrical connection Two-wire connection for power supply and data transfer
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
PA– PA+
PROFIBUS PA
–
–
–
–
EX
EX
U– 9…32 V DC...
1 2
FEL50A
Segment coupler
PLC
PROFIBUS DP
PROFIBUS PA
EX
EX
PC with Commuwin II
Proficard or Profiboard
Segment coupler

Liquiphant M FTL51C
Endress+Hauser 15
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
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 FTL51C
16 Endress+Hauser
Electronic insert FEL50D (density)
Power supply Frequency range: 300 to 1500 Hz
Signal level: 4 mA
Pulse height: 16 mA
Pulse width: 20 μS
Electrical connection Two-wire connection at Density Computer FML621
For connecting to the density and concentration computer
FML621.
The output signal is based on pulse technology.
With the aid of this signal, the fork frequency is constantly
forwarded to the switching unit.
" Caution!
Operation with other switching units,
such as FTL325P, is not permitted.
This electronic insert cannot be installed in devices that were originally used as a point level switch.
TI420Fen004
Signal on alarm Output signal on power failure or in the event of damaged sensor: 0 Hz
Adjustment In the Liquiphant M modular system, the option of an adjustment is also provided in addition to the electronics
(see feature 60: "Accessories").
There are three types of adjustment:
Standard adjustment (see ordering information for additional options, basic version A)
• Here, two fork parameters are determined to describe the sensor characteristics, indicated in the adjustment
report and provided with the product.
These parameters must be transmitted to the Density Computer FML621.
Special adjustment (see ordering information for additional options, special adjustment, density H2O (K) or
special adjustment, density H2O with 3.1 certificate (L))
• Here, three fork parameters are determined to describe the sensor characteristics, indicated in the adjust-
ment report and provided with the product.
These parameters must be transmitted to the Density Computer FML621.
Greater accuracy is achieved with this type of adjustment (see also "Performance characteristics").
Field adjustment
• During field adjustment, a density value actually determined by the customer is entered and the system is
automatically adjusted to this value (wet adjustment).
! Note!
Further information on Liquiphant M Density is available in Technical Information TI420F. This document is
available for download at www.endress.com => Download.
– +
10 82
112 182
EX
EX
1 2
FEL50D
EEx ia
FML621
Endress+Hauser
On
FML621
– +
pulse

Liquiphant M FTL51C
Endress+Hauser 17
Operating principle Measuring the density of a liquid medium in pipes and tanks. Also suitable for use in hazardous areas, and
preferably for applications in the chemical and food industry.
TI420Fxx016
* Pressure and temperature information required depending on the application.
1. Liquiphant M sensor with electronic insert FEL50D (pulse output);
2. Temperature sensor (e.g. 4 to 20 mA output);
3. Pressure transmitter (4 to 20 mA output);
4. Liquiphant density and concentration computer FML621 with display and operating unit
Light signals
Endress+Hauser
On
RMM621
**
Endress+Hauser
On
RMM621
1. 2. 3. 4.
PLC/SPS
PLC/SPS
FML621
FML621
EX EX
LED Symbol Information
Yello
w
Measurement valid
Unstable process situation
Maintenance required
Green Power on
Power off
Red No fault
Maintenance required
Device failure

Liquiphant M FTL51C
18 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
Safety 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
Min. = 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 behavior 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 Max. +/–1 mm (at reference operating conditions)
Repeatability 0.1 mm
Hysteresis ECTFE: approx. 2 mm
PFA: approx. 2 mm
Enamel: approx. 2.5 mm
Influence of medium
temperature
ECTFE: max. +1.4 mm to –2.8 mm (–50 °C to +120 °C)
PFA: max. +1.4 mm to –2.8 mm (–50 °C to +150 °C)
Enamel: max. +0.6 mm to –1.5 mm (–50 °C to +150 °C)
Influence of medium density Max. +4.8 mm to –3.5 mm (0.5 g/cm3 to 1.5 g/cm3)
Influence of medium pressure ECTFE: max. 0 mm to –2.0 mm (0 bar to 40 bar)
PFA: max. 0 mm to –2.0 mm (0 bar to 40 bar)
Enamel: max. 0 mm to –1.0 mm (0 bar to 25 bar)
Ambient temperature: 23 °C
Medium temperature: 23 °C
Medium density: 1 g/cm3 (water)
Viscosity: 1 mm2/s
Medium pressure pe: 0 bar
Sensor mounting: vertical from above
Density switch: to > 0.7
13mm
Switchpoint
for
reference conditions

Liquiphant M FTL51C
Endress+Hauser 19
Operating conditions
Installation
Installation instructions
! Note!
The switch points of the Liquiphant M are at other positions to those of the previous version Liquiphant II.
Synthetic coating:
Enamel coating:
Switch points on the sensor depend on the mounting position, with reference to water,
Density 1 g/cm3
, 23 °C, pe 0 bar.
Mounting from above Mounting from below Mounting from the side
Mounting from above Mounting from below Mounting from the side
13mm
4mm
4mm
13mm
8mm
4mm

Liquiphant M FTL51C
20 Endress+Hauser
Examples of mounting Optimum mounting, without problem even with high viscosity:
! Note!
Position the fork so that the narrow edge of the tines is vertical to ensure that the liquid can run off easily.
With buildup on the tank walls:
Mounting positions with low viscosity (up to 2000 mm2
/s):
L00-FTL51Cxx-11-05-xx-xx-002
Vertical from above Flush-mounted from the side
* Ensure that there is sufficient distance between the buildup expected on the tank wall and the fork.
L00-FTL51Cxx-11-05-xx-xx-003
Vertical from above Protruding into the tank from the side
L00-FTL51Cxx-11-05-xx-xx-004
* Deburr the nozzle surfaces
*
*
(min. 1 in)
min. 25
DN 40
* *

Liquiphant M FTL51C
Endress+Hauser 21
Mounting in piping from 2"
Orientation FTL51C with short pipe (up to approx. 500 mm) - any position,
FTL51C with long pipe - vertical
Flow velocities up to 5 m/s for viscosity 1 mm2/s and density 1 g/cm3.
(Check the function for other medium conditions.)
L00-FTL51Cxx-11-05-xx-xx-005
Liquiphant M FTL51C
in the event of severe dynamic load.
Ensure adequate space outside the
tank for mounting, connection and
configuration
L00-FTL51Cxx-11-05-xx-xx-006
.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
..................................
. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
....................................
.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
.....................................
. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
...................................

Liquiphant M FTL51C
22 Endress+Hauser
Environment
Ambient temperature range Permitted ambient temperature Ta at the housing depending on the medium temperature Tp in the tank:
Medium temperatures up to 230 °C on request!
The difference in temperature between the process and ambient side (Tp - Ta) of the flange with ECTFE and
PFA
may not exceed 60 °C. For this reason, the flange might have to be included in the tank insulation where
necessary.
Ambient temperature limits –50 °C to +70 °C (function with restricted data)
Storage temperature –50 °C to +80 °C
Climate class Climate protection to IEC 68, Part 2-38,
Fig. 2a
Degree of protection
* As per EN60529
** As per NEMA 250
*** Only with M20 cable entry or G1/2 thread
Vibration resistance To IEC 68, Part 2-6 (10 to 55 Hz, 0.15 mm, 100 cycles)
Electromagnetic compatibility Interference emission to EN 61326, Electrical Equipment Class B
Interference immunity to EN 61326; Annex A (Industrial) and NAMUR Recommendation NE 21 (EMC)
*
**
Additional temperature range for devices with a temperature spacer or pressure tight feed-through.
Maximum ambient temperature with FEL50D/FEL50A in hazardous areas.
Ta
Tp
70 °C
Ta
50 °C
0 °C
0 °C 50 °C
*
100 °C 150 °C Tp
90 °C
–50 °C
–50 °C
**
Types of housing IP65 IP66* IP67* IP68* IP69k NEMA4X**
Polyester housing F16 – X X – – X
Stainless steel housing F15 – X X – – X
Aluminum housing F17 X X X – – X
Aluminum housing F13 X X – X*** – X
Stainless steel housing F27 – X – X – 4x / 6P
Aluminum housing T13
with separate connection compartment
(EEx d)
X X – X*** – 4x / 6P

Liquiphant M FTL51C
Endress+Hauser 23
Medium conditions
Medium temperature ECTFE: –50 °C to +120 °C
PFA: –50 °C to +150 °C/up to 230 °C on request
Enamel: max. –50 °C to +150 °C/up to 200 °C on request
Thermal shock Max. 120 °C/s
Medium pressure pe The following values apply over the entire temperature range. Pay attention to exceptions for flange process
connections!
• ECTFE: –1 to +40 bar
• PFA: –1 to +40 bar
• Enamel: max. –1 to +25 bar
Please refer to the standards listed for the permitted pressure values of the flanges at higher temperatures:
• pR EN 1092-1: 2005
With regard to their stability-temperature property, the materials 1.4435 and 1.4404 are identical and are
grouped together under 13E0 in EN
1092-1 Tab. 18. The chemical composition of the two materials can be identical.
• ASME B 16.5a - 1998 Tab. 2-2.2 F316
• ASME B 16.5a - 1998 Tab. 2.3.8 N10276
• JIS B 2220
The lowest value from the derating curves of the device and selected flange applies in each case.
Test pressure Max. 100 bar (1.5 times the medium pressure pe); no function during test pressure
Sensor burst pressure 200 bar
Pressure shock Max. 20 bar/s
State of aggregation Liquid
Density ≥ 0.7 g/cm3 = delivery status
≥ 0.5 g/cm3
* can be adjusted via switches
Viscosity Max. 10000 mm2/s
Solids content Max. ø5 mm

Liquiphant M FTL51C
24 Endress+Hauser
Mechanical construction
Design Summary of all electrical and mechanical versions
Plug-in electronic inserts to mount in the housing
Housing
FEL51:
FEL52:
FEL54:
FEL55:
FEL56:
FEL58:
FEL57:
FEL50A:
FEL50D:
Two-wire AC connection
Three-wire DC connection PNP
Universal current connection, 2 relay outputs
Output 16/8 mA for separate switching unit
Output 0.6 to 1.0 / 2.2 to 2.8 mA for separate switching unit (NAMUR)
Output 2.2 to 3.5 / 0.6 to 1.0 mA for separate switching unit (NAMUR)
Output 150/50 Hz, PFM, for separate switching unit (Nivotester)
Digital communication PROFIBUS PA
Pulse output for Density Computer FML621
L00-FTL5xxxx-03-05-xx-xx-001 L00-FTL5xxxx-03-05-xx-xx-002 L00-FTL5xxxx-03-05-xx-xx-003 L00-FTL5xxxx-03-05-xx-xx-004
F16
Polyester (PBT)
F15
Stainless steel (316L)
F17/F13
Aluminum (also for EEx
d), coated
F27
Stainless steel (316L)
T13
Aluminum with separate
connection compartment (also
EEx de and EEx d), coated
Bushings
Temperature spacer and pressure tight feed-through
Process connections
Flanges* to DIN, ANSI, JIS from DN 40 / 1½"
* The following applies for DN 25/ANSI 1":
Pipe diameter (D) max. 24.2 mm, radius (R) max. 4 mm.
Take into account for counterflange!
Sensors
With extension pipe up to 3 m
or special "length L II" (see also Page 24)
Length L Length L II
L00-FTL51Cxx-03-05-xx-xx-001
D
R
*

Liquiphant M FTL51C
Endress+Hauser 25
Dimensions (in mm) Housing and sensor FTL51C
! Note!
Polyester housing F16
L00-FTL51Cxx-06-05-xx-xx-025
Stainless steel housing F15
L00-FTL51Cxx-06-05-xx-xx-126
Aluminum housing F17/F13
Stainless steel housing (316L) F27
Aluminum housing T13 with separate
connection compartment
* This length is customer-specific.
ø85 max. 76
max. 20.6
max.155min.115*
ø76 max. 64
max.150min.115*
~25(ECTFE,PFA)
~29(Email/)enamel
*
ø80 max. 60
max. 69
max.173
10
ø21.5
max. 65 max. 97
max.190*
ø21.5

Liquiphant M FTL51C
26 Endress+Hauser
Bushings: temperature spacer, pressure tight feed-through
Process connections
Any length L:
148 mm to 3000 mm (6 in to 115 in) for synthetic coating
148 mm to 1200 mm (6 in to 48 in) for enamel coating
! Note!
Special length "L II":
115 mm (4.5 in)
With vertical mounting from above the same switchpoint as for the Liquiphant II
FTL360, FTL365, FDL30, FDL35
Weights See product structure
Temperature spacer
Provides sealed insulation for the vessel
and normal ambient temperatures
for the housing.
L00-FTL51Cxx-11-05-xx-en-000
Pressure tight feed-through
Protects the housing from pressures
up to 40 bar
if the sensor is damaged.
Provides sealed insulation for the vessel
and normal ambient temperatures
for the housing.
Process connection Dimensions Accessories Pressure
Temperature
Flanges:
Synthetic coating
ANSI B16.5 (FF)
EN 1092-1 (Form A)
JIS B 2238 (FF)
Enamel coating
ANSI B16.5 (RF)
EN 1092-1 (Form B)
JIS B 2238 (RF)
A##
B##
C##
K##
L00-FTL51Cxx-06-05-xx-xx-024
In event of synthetic
coating:
PTFE seal
supplied
In event of enamel
coating:
Seal provided by the
customer
See nominal pressure
of flange, however
For ECTFE:
For PFA (Edlon*):
For enamel:
Max. 40 bar
Max. 120 °C
Max. 40 bar
Max. 150 °C
Max. 25 bar
Max. 150 °C
*) FDA-compliant material in accordance with 21 CFR Part 177.1550/2600
Sensor length L
for FTL51C
additional length
140 mm
Vessel
insulation
min. 115 mm
ø24,8
L

Liquiphant M FTL51C
Endress+Hauser 27
Material Material specifications as per AISI and DIN-EN.
Parts in contact with process
• Process connection and extension pipe: 316L (1.4435) coated
• Tuning fork: 316L (1.4435) coated
• Flanges coated:
Parts with no process contact
• Tuning fork/housing seal: EPDM
• Temperature spacer: 316 L (1.4435)
• Pressure tight feed through: 316L (1.4435)
• Grounding at housing (outside): 304 (1.4301)
• Nameplate at housing (outside): 304 (1.4301)
• Cable glands
– Housing F13, F15, F16, F17: polyamide (PA)
With B or C approval (→ ä 31 ordering information): nickel-plated brass
– Housing F27: 316L
– Housing T13: nickel-plated brass
• Polyester housing F16: PBT-FR with PBT-FR cover or with PA12 transparent cover
– Cover seal: EPDM
– Nameplate glued: polyester film (PET)
– Pressure compensation filter: PBT-GF20
• Stainless steel housing F15: 316L (1.4404)
– Cover seal: silicone
– Safety claw: 304 (1.4301)
– Pressure compensation filter: PBT-GF20, PA
• Aluminum housing F17/F13: EN-AC-AlSi10Mg, plastic-coated
– Safety claw: nickel-plated brass
– Pressure compensation filter: silicone
• Stainless steel housing F27: 316L (1.4435)
– Cover seal: FVMQ (optional: EPDM seal available as spare part)
– Safety claw: 316L (1.4435)
• Aluminum housing T13: EN-AC-AlSi10Mg, plastic-coated
– Safety claw: nickel-plated brass
Process connections • Flanges made of 316L (1.4404) - synthetic coating; flanges made of 1.0487 (ASTMA 529) - enamel coating
• Flanges to EN/DIN from DN 25, for standards see "Product structure," to ANSI B16.5 from 1", to JIS B 2238
(RF) from DN 50
Layer thickness ECTFE PFA
(EdlonTM)
PFA
(RubyRed)
PFA
(conductive)
Enamel
Lower limit 0.5 mm 0.45 mm 0.45 mm 0.45 mm 0.4 mm
Upper limit 1.6 mm 1.6 mm 1.6 mm 1.6 mm 0.8 mm
Carrier material 316L (1.4404) 316L (1.4404) 316L (1.4404) 316L (1.4404) 1.0487

Liquiphant M FTL51C
28 Endress+Hauser
Human interface
Electronic inserts
Operating concept Onsite configuration
With FEL51, FEL52, FEL54, FEL55:
2 switches for safety mode and density change,
green LED to indicate operational status,
red LED to indicate the switching status,
flashes in the event of corrosion damage on sensor
or if the electronics are defective
With FEL56:
green LED flashes to indicate operational status,
red LED to indicate the switching status,
With FEL57:
2 switches for density change and
cyclical checking,
green LED to indicate operational status,
yellow LED to indicate the covered status,
With FEL58:
green LED flashes quickly to indicate operational status,
flashes slowly in the event of corrosion damage on sensor
yellow LED to indicate the switching status,
Test key – breaks the cable connection
With FEL50A:
• 8 switches for configuring the device address
• green LED to indicate operational status,
pulsing to indicate communication;
• yellow LED to indicate the switching status,
With FEL50D:
• yellow LED: to indicate the validation of the measurement
• green LED: to indicate the operational status
• red LED: to indicate faults
TI328Fxx004
Min
Max1
2
>0,7
>0,5
FEL51
1 2
L1 N U~
19...253V AC
50/60Hz
I max : 350mA
Connecting terminal LEDs Switches
HWOFF
ON
Address
SW
1 2 3 4 5 6 7 8
FEL50A
1 2
PA– PA+
Connecting terminal LEDs Switches
–
Impuls
FEL50D
+
GN
YE
RD

Liquiphant M FTL51C
Endress+Hauser 29
Certificates and approvals
Certificates See product structure
Combinations of coatings,
housings and electronic
inserts
Based on the various certificates, permissible combinations of coatings, housings *
and electronic inserts are given in the following table.
*) Abbreviations: Polyester = PBT, steel 1.4301/1.4435 = St., aluminum = Alu
Aluminum housing with separate connection compartment = Alu/sep.
Coating: ECTFE, PFA, enamel
Certificate,
applications
Housing Electronic inserts
A Without any special certificate
(for non-hazardous area)
PBT, St., Alu, Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/50D
D Overfill protection to WHG (Germany) PBT, St., Alu, Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A
R FM, NI,
Cl. I, Div. 2, Gr. A–D
St., Alu, Alu/sep.
with NPT cable entry
FEL51/52/54,
FEL55/56/57/58/50D
PBT
FEL51/52,
FEL55/56/57/58/50D
U CSA, General Purpose St., Alu, Alu/sep.
FEL51/52/54,
FEL55/56/57/58/50D***
PBT
FEL51/52,
FEL55/56/57/58/50D***
Y Other certificate
(for non-hazardous area)
PBT, St., Alu, Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/50D
Coating: enamel or PFA (conductive)
Certificate,
applications
B ATEX II 3G EEx nC IIC T6, WHG PBT, St., Alu, Alu/sep. FEL54
ATEX II 3G EEx nC IIC T6, WHG
ATEX II 3D T85°C, WHG
St., Alu, Alu/sep. FEL54
C ATEX II 3G EEx nA IIC T6, WHG PBT, St., Alu, Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/
50D***
ATEX II 3G EEx nA IIC T6, WHG
ATEX II 3D T85°C, WHG
St., Alu, Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/
50D***
E ATEX II 1/2 G, EEx de IIC T6, WHG Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/50D
F ATEX II 1/2 G, EEx ia IIC T6, WHG PBT, St., Alu, Alu/sep. FEL55/56/57/58/50A/50D
ATEX II 1/2 G, EEx ia IIC T6, WHG
ATEX II 1/2 D, T80°C
St., Alu, Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/50D
L ATEX II 1/2 G, EEx d IIC T6, WHG Alu FEL51/52/54,
FEL55/56/57/58/50A/50D
P FM, IS, Cl. I, II, III, Div. 1, Gr. A–G PBT, St., Alu, Alu/sep.
FEL55/56/57/58/50D/
50D***
Q FM, XP, Cl. I, II, III, Div. 1, Gr. A–G Alu
FEL51/52/54,
FEL55/56/57/58/50D
S CSA, IS, Cl. I, II, III, Div. 1, Gr. A–G PBT, St., Alu, Alu/sep.
FEL55/56/57/58/50D/
50D***
T CSA, XP, Cl. I, II, III, Div. 1, Gr. A–G Alu
FEL51/52/54,
FEL55/56/57/58/50D/
50D***
Coating: ECTFE, PFA (non-conductive)

Liquiphant M FTL51C
30 Endress+Hauser
Certificate,
applications
1 ATEX II 1/2 G, EEx ia IIB T6, WHG PBT, St., Alu, Alu/sep. FEL55/56/57/58/50A/50D
2 ATEX II 1/2 G, EEx d IIB T6, WHG Alu FEL51/52/54,
FEL55/56/57/58/50A/50D
3 ATEX II 1/2 G, EEx de IIB T6, WHG Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/50D
4 ATEX II 1/2 G, EEx ia IIC** T6, WHG PBT, St., Alu, Alu/sep. FEL55/56/57/58/50A/50D
5 ATEX II 1/2 G, EEx d IIC** T6, WHG Alu FEL51/52/54,
FEL55/56/57/58/50A/50D
6 ATEX II 1/2 G, EEx de IIC** T6, WHG Alu/sep. FEL51/52/54,
FEL55/56/57/58/50A/50D
** With instruction: "Avoid electrostatic charge"
*** In preparation!

Liquiphant M FTL51C
Endress+Hauser 31
Ordering information
Liquiphant M FTL51C product
structure
Design Basic weight
FTL51C With extension pipe 0.6 kg
10 Approval:
A Non-hazardous area
B ATEX/NEPSI II 3 G EEx nC II T6 Overfill protection to WHG (Germany)
ATEX/NEPSI II 3 D T 85 °C*
C ATEX/NEPSI II 3 G EEx nA II T6 Overfill protection to WHG (Germany)
ATEX/NEPSI II 3 D T 85 °C*
D Non-hazardous area Overfill protection to WHG (Germany)
E ATEX II 1/2 G EEx de IIC T6 Overfill protection to WHG (Germany)
F ATEX II 1/2 G EEx ia IIC T6 Overfill protection to WHG (Germany)
ATEX II 1/2 D T 80 °C*
L ATEX II 1/2 G EEx d IIC T6 Overfill protection to WHG (Germany)
M NEPSI Ex ia IIC T6
N NEPSI Ex d IIC T6
P FM IS, Class I, II, III Division 1, Group A–G
Q FM XP, Class I, II, III Division 1, Group B–G, for E5 housing Group A–G
R FM NI, Class I Division 2, Group A–D
S CSA IS, Class I, II, III Division 1, Group A–G
T CSA XP, Class I, II, III Division 1, Group A–G
U CSA General Purpose
V TIIS Ex ia IIC T3
W TIIS Ex d IIB T3
X TIIS Ex ia IIC T6
Y Special version
1 ATEX II 1/2 G EEx ia IIB T6 Overfill protection to WHG (Germany)
2 ATEX II 1/2 G EEx d IIB T6 Overfill protection to WHG (Germany)
3 ATEX II 1/2 G EEx de IIB T6 Overfill protection to WHG (Germany)
4 ATEX II 1/2 G EEx ia IIC T6 Overfill protection to WHG (Germany)
Observe safety instructions (XA) (electrostatic charge)!
5 ATEX II 1/2 G EEx d IIC T6 Overfill protection to WHG (Germany)
6 ATEX II 1/2 G EEx de IIC T6 Overfill protection to WHG (Germany)
7 TIIS Ex d IIC T3
8 TIIS Ex d IIC T6
*) Not for PBT
20 Process connection: Additional weight
ACK 1½" 150 lbs ECTFE > 316/316L Flange ANSI B16.5 1.5 kg
ACL 1½" 150 lbs PFA (EdlonTM
) > 316/316L Flange ANSI B16.5 1.5 kg
ACM 1½" 150 lbs PFA (RubyRed) > 316/316L Flange ANSI B16.5 1.5 kg
ACN 1½" 150 lbs PFA (conductive) > 316/316L Flange ANSI B16.5 1.5 kg
AEK 2" 150 lbs ECTFE > 316/316L Flange ANSI B16.5 2.4 kg
AEL 2" 150 lbs PFA (EdlonTM
) > 316/316L Flange ANSI B16.5 2.4 kg
AEM 2" 150 lbs PFA (RubyRed) > 316/316L Flange ANSI B16.5 2.4 kg
AEN 2" 150 lbs PFA (conductive) > 316/316L Flange ANSI B16.5 2.4 kg
AES 2" 150 lbs Enamel > 316/316L Flange ANSI B16.5 2.4 kg
AFK 2" 300 lbs ECTFE > 316/316L Flange ANSI B16.5 3.2 kg
AFL 2" 300 lbs PFA (EdlonTM
) > 316/316L Flange ANSI B16.5 3.2 kg
AFM 2" 300 lbs PFA (RubyRed) > 316/316L Flange ANSI B16.5 3.2 kg
AFN 2" 300 lbs PFA (conductive) > 316/316L Flange ANSI B16.5 3.2 kg
AFS 2" 300 lbs Enamel > 316/316L Flange ANSI B16.5 3.2 kg
ALK 3" 150 lbs ECTFE > 316/316L Flange ANSI B16.5 4.9 kg
ALL 3" 150 lbs PFA (EdlonTM
) > 316/316L Flange ANSI B16.5 4.9 kg
ALM 3" 150 lbs PFA (RubyRed) > 316/316L Flange ANSI B16.5 4.9 kg
ALN 3" 150 lbs PFA (conductive) > 316/316L Flange ANSI B16.5 4.9 kg
APK 4" 150 lbs ECTFE > 316/316L Flange ANSI B16.5 7.0 kg
APL 4" 150 lbs PFA (EdlonTM
) > 316/316L Flange ANSI B16.5 7.0 kg
APM 4" 150 lbs PFA (RubyRed) > 316/316L Flange ANSI B16.5 7.0 kg
APN 4" 150 lbs PFA (conductive) > 316/316L Flange ANSI B16.5 7.0 kg
A8K 1" 150 lbs ECTFE > 316/316L Flange ANSI B16.5 1.0 kg
A8L 1" 150 lbs PFA (EdlonTM
) > 316/316L Flange ANSI B16.5 1.0 kg
A8M 1" 150 lbs PFA (RubyRed) > 316/316L Flange ANSI B16.5 1.0 kg

Liquiphant M FTL51C
32 Endress+Hauser
A8N 1" 150 lbs PFA (conductive) > 316/316L Flange ANSI B16.5 1.0 kg
BBK DN32 PN25/40 ECTFE >316L Flange EN 1092-1 (DIN 2527) 2.0 kg
BBL DN32 PN25/40 PFA (EdlonTM
) >316L Flange EN 1092-1 (DIN 2527) 2.0 kg
BBM DN32 PN25/40 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 2.0 kg
BBN DN32 PN25/40 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 2.0 kg
BDK DN40 PN25/40 ECTFE >316L Flange EN 1092-1 (DIN 2527) 2.4 kg
BDL DN40 PN25/40 PFA (EdlonTM
) >316L Flange EN 1092-1 (DIN 2527) 2.4 kg
BDM DN40 PN25/40 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 2.4 kg
BDN DN40 PN25/40 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 2.4 kg
BEK DN50 PN6 ECTFE >316L Flange EN 1092-1 (DIN 2527) 1.6 kg
BEL DN50 PN6 PFA (EdlonTM) >316L Flange EN 1092-1 (DIN 2527) 1.6 kg
BEM DN50 PN6 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 1.6 kg
BEN DN50 PN6 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 1.6 kg
BGK DN50 PN25/40 ECTFE >316L Flange EN 1092-1 (DIN 2527) 3.2 kg
BGL DN50 PN25/40 PFA (EdlonTM
) >316L Flange EN 1092-1 (DIN 2527) 3.2 kg
BGM DN50 PN25/40 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 3.2 kg
BGN DN50 PN25/40 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 3.2 kg
BNK DN80 PN25/40 ECTFE >316L Flange EN 1092-1 (DIN 2527) 5.9 kg
BNL DN80 PN25/40 PFA (EdlonTM
) >316L Flange EN 1092-1 (DIN 2527) 5.9 kg
BNM DN80 PN25/40 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 5.9 kg
BNN DN80 PN25/40 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 5.9 kg
BQK DN100 PN10/16 ECTFE >316L Flange EN 1092-1 (DIN 2527) 5.6 kg
BQL DN100 PN10/16 PFA (EdlonTM
) >316L Flange EN 1092-1 (DIN 2527) 5.6 kg
BQM DN100 PN10/16 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 5.6 kg
BQN DN100 PN10/16 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 5.6 kg
B8K DN25 PN25/40 ECTFE >316L Flange EN 1092-1 (DIN 2527) 1.4 kg
B8L DN25 PN25/40 PFA (EdlonTM
) >316L Flange EN 1092-1 (DIN 2527) 1.4 kg
B8M DN25 PN25/40 PFA (RubyRed) >316L Flange EN 1092-1 (DIN 2527) 1.4 kg
B8N DN25 PN25/40 PFA (conductive) >316L Flange EN 1092-1 (DIN 2527) 1.4 kg
CGS DN50 PN25/40 Enamel >1.0487 Flange EN 1092-1 (DIN 2527) 3.2 kg
CNS DN80 PN25/40 Enamel >1.0487 Flange EN 1092-1 (DIN 2527) 5.9 kg
KEK 10 K 50 ECTFE >316L Flange JIS B2238 1.7 kg
KEL 10 K 50 PFA (EdlonTM
) >316L Flange JIS B2238 1.7 kg
KEM 10 K 50 PFA (RubyRed) >316L Flange JIS B2238 1.7 kg
KEN 10 K 50 PFA (conductive) >316L Flange JIS B2238 1.7 kg
YY9 Special version
30 Probe length; Type:
BK ....... mm ECTFE 0.9 kg/m
BL ....... mm PFA (EdlonTM
) 0.9 kg/m
BM ....... mm PFA (RubyRed) 0.9 kg/m
BN ....... mm PFA (conductive) 0.9 kg/m
BS ....... mm Enamel 0.9 kg/m
CK ....... inch ECTFE 2.3 kg/100 in
CL ....... inch PFA (EdlonTM
) 2.3 kg/100 in
CM ....... inch PFA (RubyRed) 2.3 kg/100 in
CN ....... inch PFA (conductive) 2.3 kg/100 in
CS ....... inch Enamel 2.3 kg/100 in
DK Length: type II** ECTFE
DL Length: type II** PFA (EdlonTM
)
DM Length: type II** PFA (RubyRed)
DN Length: type II** PFA (conductive)
DS Length: type II** Enamel
YY Special version
**) Replacing devices: when vertically mounting a Liquiphant M FTL51C
with length II, the switch point is at the same height as for a Liquiphant II
FTL360, FTL365, FDL30, FDL35
40 Electronics; output:
A FEL50A PROFIBUS PA
D FEL50D Density/concentration
1 FEL51 2-wire 19 to 253 V AC
2 FEL52 3-wire PNP 10 to 55 V DC
4 FEL54 Relay DPDT 19 to 253 V AC, 19 to 55 V DC
5 FEL55 8/16 mA, 11 to 36 V DC
6 FEL56 NAMUR (L-H signal)
7 FEL57 2-wire PFM
20 Process connection: Additional weight

Liquiphant M FTL51C
Endress+Hauser 33
8 FEL58 NAMUR + test keys (H-L signal)
9 Special version
50 Housing; cable entry:
E1* F27 316L NEMA6P; Thread NPT ¾
E4 F16 Polyester NEMA4X; Thread NPT ½
E5 F13/F17 Alu NEMA4X; Thread NPT ¾ 0.5 kg
E6 F15 316L NEMA4X; Thread NPT ½ 0.1 kg
E7 T13 Alu coated, IP66; Thread NPT ¾ 0.9 kg
Separate connection compartment
F1* F27 316L IP68 Thread G1/2
F4 F16 Polyester IP66; Thread G ½
F5 F13/F17 Alu IP66; Thread G ½ 0.5 kg
F6 F15 316L IP66; Thread G ½ 0.1 kg
F7 T13 Alu coated, IP66; Thread G ½ 0.9 kg
Separate connection compartment
G1* F27 316L IP68; M20 threaded joint
G4 F16 Polyester IP66; M20 threaded joint
G5 F13/F17 Alu IP66; M20 threaded joint 0.5 kg
(EEx d > M20 thread)
G6 F15 316L IP66; M20 threaded joint 0.1 kg
G7 T13 Alu coated, IP66; M20 threaded joint 0.9 kg
Separate connection compartment (EEx d > M20 thread)
N4 F16 Polyester IP66; M12 connector
N5 F13/F17 Alu IP66; M12 connector
N6 F15 316L IP66; M12 connector
Y9 Special version
* F27 housing in preparation.
60 Additional options 1:
A Not selected
K Special adjustment, density H20
L Special adjustment, density H20, EN10204-3.1
S GL/ABS marine approval (max. 1600 mm)
Y Special version
70 Additional options 2:
A Not selected
B Temperature spacer
C 2nd line of defence > pressure tight feed-through
Y Special version
FTL51C - Complete product designation
Note!
The basic weight includes the compact sensor, electronic insert and polyester housing
40 Electronics; output:

Liquiphant M FTL51C
34 Endress+Hauser
Accessories
Transparent cover
Cover with sight glass
Documentation
! Note!
You can find supplementary documentation on the product pages at www.endress.com
Operating Instructions Electronic insert FEL50A for Liquiphant M/S
PROFIBUS PA
BA141F/00/en
Liquiphant M Density,
Density Computer FML621
BA335F/00/en
Liquiphant M FTL51C
KA162F/00/a6
Liquiphant M FTL51C-######## 7 ##
KA165F/00/a6
Liquiphant M Density FTL50, FTL51
Electronic insert: FEL50D
KA284F/00/a6
Liquiphant M Density FTL50H, FTL51H
KA285F/00/a6
Liquiphant M Density FTL51C
KA286F/00/a6
Technical Information Nivotester FTL370/372, switching units in Racksyst design
for Liquiphant M with electronic insert FEL57
TI198F/00/en
Nivotester FTL320, switching unit in Minipac design
for Liquiphant M with electronic insert FEL57
TI203F/00/en
General instructions for electromagnetic compatibility
(Test procedure, installation recommendation)
TI241F/00/en
Liquiphant M FTL50/51(H), for process temperatures up to 150 °C
For polyester housing F16
Material: PA 12
Weight: 0.04 kg
Order number: 943461-0001
For stainless steel housing F15
Material: AISI 316L
Weight: 0.16 kg
– With glass sight glass
Order number: 943301-1000
– With PC sight glass
Order number: 52001403
(Not for CSA, General Purpose)

Liquiphant M FTL51C
Endress+Hauser 35
TI328F/00/en
Isolating amplifier FTL325P,
1 or 3-channel switching units for top-hat rail mounting
for Liquiphant M/S with electronic insert FEL57
TI350F/00/en
Isolating amplifier FTL325N,
1 or 3-channel switching units for top-hat rail mounting
For Liquiphant M/S with electronic insert FEL56, FEL58
TI353F/00/en
Liquiphant S FTL70/71, for medium temperatures up to 280 °C
TI354F/00/en
Isolating amplifier FTL375P,
1 to 3-channel switching units for top-hat rail mounting
for Liquiphant M/S with electronic insert FEL57
TI360F/00/en
Isolating amplifier FTL375N,
1 to 3-channel switching units for top-hat rail mounting
For Liquiphant M/S with electronic insert FEL56, FEL58
TI361F/00/en
Liquiphant M Density,
Density Computer FML621
TI420F/00/en
Functional safety (SIL) Liquiphant M/S with electronic insert FEL51 (MAX)
SD164F/00/en
Liquiphant M/S with electronic insert FEL51 (MIN)
SD185F/00/en
Liquiphant M/S with electronic insert FEL52 (MAX)
SD163F/00/en
SD186F/00/en
SD162F/00/en
SD187F/00/en
SD167F/00/en
SD279F/00/en
Liquiphant M/S with electronic insert FEL57 + Nivotester FTL325P (MAX)
SD111F/00/en
Liquiphant M/S with electronic insert FEL57 + Nivotester FTL325P (MIN)
SD231F/00/en
Liquiphant M/S with electronic insert FEL57+ Nivotester FTL375P (MAX)
SD113F/00/en
Liquiphant M/S with electronic insert FEL56 + Nivotester FTL325N (MAX)
SD168F/00/en
Liquiphant M/S with electronic insert FEL56 + Nivotester FTL325N (MIN)
SD188F/00/en
Liquiphant M/S with electronic insert FEL58 + Nivotester FTL325N (MAX)
SD161F/00/en
Liquiphant M/S with electronic insert FEL58 + Nivotester FTL325N (MIN)
SD170F/00/en
Safety Instructions (ATEX) 4 0 II 1/2 G, EEx d IIC/B

Liquiphant M FTL51C
36 Endress+Hauser
(KEMA 99 ATEX 1157)
XA031F/00/a3
4 0 II 1/2 G, EEx ia/ib IIC/B
(KEMA 99 ATEX 0523)
XA063F/00/a3
4 0 II 1 G, EEx ia IIC/B
(KEMA 99 ATEX 5172 X)
XA064F/00/a3
4 0 II 1/2 G, EEx de IIC/B
(KEMA 00 ATEX 2035)
XA108F/00/a3
4 0 II 3 G, EEx nA/nC II
(EG 01 007–a)
XA182F/00/a3
Safety Instructions (NEPSI) Ex d IIC/IIB T3-T6 , Ex d IIC T2-T6
(NEPSI GYJ06424)
XA401F/00/B2
Ex ia IIC T2-T6, Ex ia IIB T3-T6
(NEPSI GYJ05556, NEPSI GYJ06464),
XC009F/00/b2
Ex nA II T3-T6, Ex nC/nL IIC T3-T6
(NEPSI GYJ04360, NEPSI GYJ071414)
XC010F/00/b2
Control Drawings Liquiphant M/S (IS and NI) Current output PFM, NAMUR Entity installation
Class I, Div. 1, 2, Groups A, B, C, D
Class I, Zone 0
Class II, Div. 1, 2, Groups E, F, G
Class III
ZD041F-I/00/EN
Liquiphant M, Liquiphant S (cCSAus / IS)
Class I, Div. 1, Groups A, B, C, D Ex ia IIC T6
Class II, Div. 1, Groups E, F, G
Class III
ZD042F-G/00/EN
Liquiphant M/S (NI), FTL50(H), FTL51(H), FTL51C, FTL70, FTL71
Class I, Div. 2, Groups A, B, C, D
Class II, Div. 2, Groups F, G
Class III
ZD043F-C/00/EN
Liquiphant M, Liquiphant S (cCSAus / XP)
Class I, Groups A, B, C, D
Class II, Groups E, F, G
Class III
ZD240F/00/EN
Liquiphant M/S (IS and NI) PROFIBUS PA, FOUNDATION FieldbusClass I, Zone 0, IIC
Class I, Division 1, 2, Groups A, B, C, D
Class II, Division 1, 2, Groups E, F, G
Class III
ZD244F/00/EN
System information Liquiphant M
SI040F/00/en

Liquiphant M FTL51C
Endress+Hauser 37

Liquiphant M FTL51C
38 Endress+Hauser

Liquiphant M FTL51C
Endress+Hauser 39

Instruments International
Endress+Hauser
Instruments International AG
Kaegenstrasse 2
4153 Reinach
Switzerland
Tel. +41 61 715 81 00
Fax +41 61 715 25 00
www.endress.com
info@ii.endress.com
TI347F/00/en/05.10
71114954
SL/FM+SGML6.0 ProMoDo 71114954

Vibronic-Point level switch-Liquiphant M FTL51C

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