Endress+Hauser Liquiphant FTL64 Manual

Point level switch for liquids in high-temperature
applications
Application
• Point level switch for all liquids, for minimum or maximum detection in tanks,
vessels and piping, even in hazardous areas
• Particularly suitable for high-temperature applications with up to 280 °C (536 °F)
• Tuning fork and process connection with highly corrosion-resistant Alloy C22
(2.4602) material and PFA-coated (conductive) version available for very
aggressive media
• Process temperature range: –60 to +280 °C (–76 to +536 °F)
• Pressures up to 100 bar (1 450 psi)
• Viscosities up to 10 000 mPa⋅s
• Ideal substitute for float switches; reliable function is not affected by flow,
turbulence, air bubbles, foam, vibration, solids content or buildup.
Advantages
• Approved for safety systems with functional safety requirements up to SIL2/SIL3
in accordance with IEC 61508
• Maximum safety thanks to welded gas-tight feedthrough, even if sensor is
damaged
• No calibration needed: Quick, low-cost commissioning
• Design in accordance with ASME B31.3 and CRN approval
• No mechanically moving parts: No maintenance, no wear, long operating life
• Functional safety: Monitoring of vibration frequency of the tuning fork
• RFID TAG – easy measuring point identification and simplified data access
• Functional testing by means of test button on electronic insert
• Heartbeat Technology via free iOS/Android SmartBlue app
• Measuring device with Bluetooth® wireless technology
Products Solutions Services
Technical Information
Liquiphant FTL64
Vibronic
TI01540F/00/EN/02.20
71498558
2020-11-30

Liquiphant FTL64
2 Endress+Hauser
Table of contents
About this document ........................ 4
Symbols ................................... 4
Function and system design ................... 5
point level detection ........................... 5
Measuring principle ........................... 5
Measuring system ............................ 5
Dependability ............................... 5
Input .................................... 5
Measured variable ............................ 5
Measuring range .............................. 5
Output ................................... 6
Output and input variants ........................ 6
Output signal ................................ 6
Ex connection data ............................ 6
2-wire AC (electronic insert FEL61) ............. 7
Supply voltage ............................... 7
Power consumption ............................ 7
Current consumption ........................... 7
Connectable load .............................. 7
Behavior of output signal ........................ 7
Terminal assignment ........................... 7
Behavior of switch output and signaling .............. 8
3-wire DC-PNP (electronic insert FEL62) ......... 9
Supply voltage ............................... 9
Power consumption ............................ 9
Current consumption ........................... 9
Load current ................................. 9
Capacitance load .............................. 9
Residual current .............................. 9
Residual voltage .............................. 9
Behavior of output signal ........................ 9
Terminal assignment ........................... 9
Behavior of switch output and signaling ............. 10
Universal current connection with relay output
(electronic insert FEL64) .................... 11
Supply voltage .............................. 11
Power consumption ........................... 11
Connectable load ............................. 11
Behavior of output signal ....................... 11
Terminal assignment .......................... 12
Behavior of switch output and signaling ............. 12
DC connection, relay output (electronic insert
FEL64 DC) ................................ 13
Supply voltage .............................. 13
Power consumption ........................... 13
Connectable load ............................. 13
Behavior of output signal ....................... 13
Terminal assignment .......................... 13
Behavior of switch output and signaling ............. 14
PFM output (electronic insert FEL67) ........... 14
Supply voltage .............................. 14
Power consumption ........................... 14
Behavior of output signal ....................... 14
Terminal assignment .......................... 15
Connection cable ............................. 15
Behavior of switch output and signaling ............. 16
2-wire NAMUR > 2.2 mA/ < 1.0 mA (electronic
insert FEL68) ............................. 16
Supply voltage .............................. 16
Power consumption ........................... 16
Behavior of output signal ....................... 16
Terminal assignment .......................... 17
Behavior of switch output and signaling ............. 17
LED module VU120 (optional) ................ 18
Supply voltage .............................. 18
Power consumption ........................... 18
Current consumption .......................... 18
Signaling of operational status .................... 18
Bluetooth module and Heartbeat Technology .... 18
Bluetooth module VU121 (optional) ................ 18
Heartbeat Technology ......................... 19
Performance characteristics .................. 19
Reference operating conditions ................... 19
Measured error ............................. 20
Hysteresis ................................. 20
Non-repeatability ............................ 20
Influence of the process temperature ............... 20
Influence of the process pressure .................. 20
Installation ............................... 20
Mounting location, orientation ................... 20
Installation instructions ........................ 21
Installing in pipes ............................ 23
Screwing in the device ......................... 23
Align the cable entry .......................... 24
Special mounting instructions .................... 24
Environment .............................. 24
Ambient temperature range ..................... 24
Storage temperature .......................... 25
Humidity .................................. 26
Operating altitude ............................ 26
Climate class ............................... 26
Degree of protection .......................... 26
Vibration resistance .......................... 26
Shock resistance ............................. 26
Mechanical load ............................. 26
Electromagnetic compatibility .................... 26
Process .................................. 26
Process temperature range ...................... 26

Liquiphant FTL64
Endress+Hauser 3
Thermal shock .............................. 26
Process pressure range ........................ 26
Test pressure ............................... 27
State of aggregation ........................... 27
Density ................................... 27
Viscosity .................................. 27
Pressure tightness ........................... 27
Solids contents .............................. 28
Lateral loading capacity ........................ 28
Mechanical construction .................... 28
Design, dimensions ........................... 28
Weight ................................... 35
Materials .................................. 35
Surface roughness ........................... 36
Operability ............................... 36
Operating concept ............................ 36
Elements on the electronic insert .................. 37
Terminals ................................. 37
Local operation ............................. 37
Local display ................................ 38
Remote interrogation ......................... 38
Diagnostic information ........................ 39
Certificates and approvals ................... 39
CE mark .................................. 39
RCM-Tick marking ............................ 39
Ex approval ................................ 39
Overfill protection ............................ 40
Functional safety ............................ 40
Marine certificate ............................ 40
Radio approval .............................. 40
CRN approval ............................... 40
Test reports ................................ 40
Pressure Equipment Directive .................... 41
Process seal as per ANSI/ISA 12.27.01 .............. 41
China RoHS symbol ........................... 41
RoHS ..................................... 41
Additional certification ......................... 41
ASME B 31.3 ............................... 41
Ordering information ....................... 42
TAG ..................................... 42
Application packages ....................... 42
Heartbeat Technology module .................... 42
Heartbeat Verification ......................... 43
Proof testing for SIL/WHG devices ................. 43
Accessories .............................. 43
Test magnet ................................ 43
Weather protection cover for dual-compartment housing,
aluminum ................................. 43
Protective cover for single compartment housing,
aluminum or 316L ............................ 44
Plug-in jack ................................ 44
Bluetooth module VU121 (optional) ................ 44
LED module VU120 (optional) .................... 45
Sliding sleeves for unpressurized operation ........... 45
High pressure sliding sleeves ..................... 46
Supplementary documentation ............... 48
Special Documentation ......................... 48
Supplementary device-dependent documentation ....... 48
Registered trademarks ...................... 48

Liquiphant FTL64
4 Endress+Hauser
About this document
Symbols Safety symbols
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or
fatal injury.
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or
fatal injury.
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in minor or
medium injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in personal
injury.
Electrical symbols
Ground connection
Grounded clamp, which is grounded via a grounding system.
Protective earth (PE)
Ground terminals, which must be grounded prior to establishing any other connections. The ground
terminals are located on the inside and outside of the device.
Symbols for certain types of information
Permitted
Procedures, processes or actions that are permitted.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information
Reference to documentation
A
Reference to another section
1.
,
2.
,
3.
Series of steps
Symbols in graphics
A, B, C ... View
1, 2, 3 ... Item numbers
-
Hazardous area
.
Safe area (non-hazardous area)

Liquiphant FTL64
Endress+Hauser 5
Function and system design
point level detection Maximum or minimum detection for liquids in tanks or pipes in all industries. Suitable for leakage
monitoring, pump dry-running protection or overfill prevention, for example .
Specific versions are suitable for use in hazardous areas.
The point level switch differentiates between the "covered" and "not covered" conditions.
Depending on the MIN (minimum detection) or MAX (maximum detection) modes, there are two
possibilities in each case: OK status and demand mode.
OK status
• In MIN mode, the fork is covered, e.g. Pump dry running protection
• In MAX mode, the fork is not covered e.g. overfill prevention
Demand mode
• In MIN mode, the fork is not covered e.g. pump dry running protection
• In MAX mode, the fork is covered e.g. overfill prevention
Measuring principle The sensor's tuning fork vibrates at its intrinsic frequency. As soon as the liquid covers the tuning
fork, the vibration frequency decreases. The change in frequency causes the point level switch to
switch.
Measuring system
AB
1
A0042328
 1 Example of a measuring system
A Device for direct connection of a load
B Device for connection to a separate switching unit or PLC
1 Switching unit, PLC etc.
Dependability Device-specific IT security
The device settings and the diagnostic data can be read out via Bluetooth. Device settings cannot be
changed via Bluetooth.
Input
Measured variable Level (point level), MAX or MIN safety
Measuring range Depends on the installation location and the pipe extension ordered
Standard pipe extension up to 3 m (9.8 ft) and up to 6 m (20 ft) on request.

Liquiphant FTL64
6 Endress+Hauser
Output
Output and input variants Electronic inserts
2-wire AC (FEL61)
• Two-wire AC version
• Switches the load directly into the power supply circuit via an electronic switch
3-wire DC-PNP (FEL62)
• Three-wire direct current version
• Switches the load via the transistor (PNP) and separate connection, e. g. in conjunction with
programmable logical controllers (PLC)
• Ambient temperature –60 °C (–76 °F), optionally available to order
Low-temperature electronic inserts are marked LT
Universal current connection, relay output (FEL64)
• Switches the loads via 2 floating change-over contacts
• Ambient temperature –60 °C (–76 °F), optionally available to order
Low-temperature electronic inserts are marked LT
Direct current connection, relay output (FEL64DC)
• Switches the load via 2 potential-free changeover contacts
• Ambient temperature –60 °C (–76 °F), optionally available to order
Low-temperature electronic inserts are marked LT
PFM output (FEL67)
• For separate switching device (Nivotester FTL325P, FTL375P)
• PFM signal transmission; current pulses are superimposed on the power supply along the two-wire
cabling
• Ambient temperature –50 °C (–58 °F), optionally available to order
The low-temperature electronic inserts are marked LT
2-wire NAMUR > 2.2 mA/< 1.0 mA (FEL68)
• For separate switching device, e. g. Nivotester FTL325N
• Signal transmission H-L edge 2.2 to 3.8/0.4 to 1.0 mA as per IEC 60917-5-6 (NAMUR) on two-
wire cable
• Ambient temperature –50 °C (–58 °F), optionally available to order
Low-temperature electronic inserts are marked LT
Output signal Switch output
The following default switching delay times can be ordered for electronic inserts FEL61, FEL62,
FEL64, FEL64DC, FEL67 and FEL68:
• 0.5 s when the tuning fork is covered and 1.0 s when it is uncovered (factory setting)
• 0.25 s when the tuning fork is covered and 0.25 s when it is uncovered (fastest configuration)
• 1.5 s when the tuning fork is covered and 1.5 s when it is uncovered
• 5.0 s when the tuning fork is covered and 5.0 s when it is uncovered
COM interface
For connecting to modules VU120 or VU121 (no modifying effect)
Bluetooth® wireless technology (optional)
The device has a Bluetooth® wireless technology interface. Device data and diagnostic data can be
read out using the free "SmartBlue" app.
Ex connection data See safety instructions (XA): All data relating to explosion protection are provided in separate Ex
documentation and are available from the Downloads Area of the Endress+Hauser-website. The Ex
documentation is supplied as standard with all Ex devices.

Liquiphant FTL64
Endress+Hauser 7
2-wire AC (electronic insert FEL61)
• Two-wire AC version
• Switches the load directly into the power supply circuit via an electronic switch; always connect in
series with a load
• Functional testing without level change
A functional test can be performed on the device using the test button on the electronic insert.
Supply voltage U = 19 to 253 VAC, 50 Hz/60 Hz
Residual voltage when switched through: typically 12 V
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the device,
and limit the current to 1 A, e. g. by installing a 1 A fuse (slow-blow) in the phase (not the
neutral conductor) of the supply circuit.
Power consumption S ≤ 2 VA
Current consumption Residual current when blocked: I ≤ 3.8 mA
The red LED flashes in the event of an overload or short-circuit. Check for an overload or short-
circuit every 5 s. The test is deactivated after 60 s.
Connectable load • Load with a minimum holding power/rated power of 2.5 VA at 253 V (10 mA) or 0.5 VA at 24 V
(20 mA)
• Load with a maximum holding power/rated power of 89 VA at 253 V (350 mA) or 8.4 VA at
24 V (350 mA)
• With overload and short-circuit protection
Behavior of output signal • OK status: load on (switched through)
• Demand mode: load off (blocked)
• Alarm: load off (blocked)
Terminal assignment Always connect an external load. The electronic insert has integrated short-circuit protection.
!
>0,5
COM
NL1
1
2
MIN
MAX >0,7
U 19...253 V AC
I max: 350 mA
~
~
1 A
L1 NPE
K
1 2
A0036060
 2 2-wire AC, electronic insert FEL61

Liquiphant FTL64
8 Endress+Hauser
Behavior of switch output
and signaling
MAX
RD YE GN
MIN
K
K
K
K
K
(N)
(N)
(N)
(N)
(N)
IL
IL
<3.8 mA
<3.8 mA
<3.8 mA
2
2
2
2
2
1
1
1
1
1
L1
L1
L1
L1
L1
ΔU
ΔU
A0031901
 3 Behavior of switch output and signaling, electronic insert FEL61
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED red for warning or alarm
YE LED yellow, switch status
GN LED green, operational status, device on
ILLoad current switched through
Selection tool for relays
3.0
1.5
1.3
20 24 27 43 48 53 60 110 121 207 230 253
S
U
P1
A0042052
 4 Recommended minimum holding power/rated power for load
S Holding power/rated power in [VA]
U Operating voltage in [V]
AC mode
• Operating voltage: 24 V, 50 Hz/60 Hz
• Holding power/rated power: > 0.5 VA, < 8.4 VA
• Operating voltage: 110 V, 50 Hz/60 Hz
• Holding power/rated power: > 1.1 VA, < 38.5 VA
• Operating voltage: 230 V, 50 Hz/60 Hz
• Holding power/rated power: > 2.3 VA, < 80.5 VA

Liquiphant FTL64
Endress+Hauser 9
3-wire DC-PNP (electronic insert FEL62)
• Three-wire DC version
• Preferably in conjunction with programmable logic controllers (PLC), DI modules as per
EN 61131-2. Positive signal at switch output of electronics module (PNP)
• Functional testing without level change
A functional test can be performed on the device using the test button on the electronic insert or
using the test magnet (can be ordered as an option) with the housing closed.
Supply voltage LWARNING
Failure to use the prescribed power unit.
Risk of potentially life-threatening electric shock!
‣The FEL62 may only be powered by devices with safe galvanic isolation, as per IEC 61010-1.
U = 10 to 55 VDC
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the device,
and limit the current to 500 mA, e. g. by installing a 0.5 A fuse (slow-blow) in the supply
circuit.
Power consumption P ≤ 0.5 W
Current consumption I ≤ 10 mA (without load)
The red LED flashes in the event of an overload or short-circuit.
Load current I ≤ 350 mA with overload and short-circuit protection
Capacitance load C ≤ 0.5 µF at 55 V, C ≤ 1.0 µF at 24 V
Residual current I < 100 µA (for blocked transistor)
Residual voltage U < 3 V (for switched through transistor)
Behavior of output signal • OK status: switched through
• Demand mode: blocked
• Alarm: blocked
Terminal assignment
!
U = 10...55 V DC
I max: 350 mA
1
3
L-L+
COM
MIN
MAX >0,7
>0,5
1
3
0.5 A
L+ L-
I 350 mA
U 55 V
max
max
K
K
IL
PE
4
3
1
2
1
3
4
M12
1 2 3
B
A
L+ L-
K
A0036061
 5 3-wire DC-PNP, electronic insert FEL62
A Connection wiring with terminals
B Connection wiring with M12 plug in housing as per EN61131-2 standard

Liquiphant FTL64
10 Endress+Hauser
Behavior of switch output
and signaling
MAX
RD YE GN
MIN
K
K
K
(L–)
(L–)
(L–)
IL
<100 µA
IL
3
3
3
1
1
1
L+
L+
L+
ΔU
ΔU
K
(L–)
<100 µA 3
1
L+
(L–)
<100 µA 3
1
L+
K
A0033508
 6 Behavior of switch output and signaling, electronic insert FEL62
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED red for warning or alarm
YE LED yellow, switch status
GN LED green, operational status, device on
ILLoad current switched through

Liquiphant FTL64
Endress+Hauser 11
Universal current connection with relay output
(electronic insert FEL64)
• Switches the loads via 2 potential-free changeover contacts
• Two galvanically isolated change-over contacts (DPDT), both change-over contacts switch
simultaneously
• Functional testing without level change. A functional test can be performed on the device using
the test button on the electronic insert or using the test magnet (can be ordered as an option) with
the housing closed.
LWARNING
An error at the electronic insert can cause the permitted temperature for touch-safe surfaces to
be exceeded. This presents a risk of burns.
‣Do not touch the electronics in the event of an error!
Supply voltage U = 19 to 253 VAC, 50 Hz/60 Hz/19 to 55 VDC
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the device,
and limit the current to 500 mA, e. g. by installing a 0.5 A fuse (slow-blow) in the phase (not
the neutral conductor) of the supply circuit.
Power consumption S < 25 VA, P < 1.3 W
Connectable load Loads switched via 2 potential-free changeover contacts (DPDT)
• IAC ≤ 6 A (Ex de 4 A), U~ ≤ AC 253 V; P~ ≤ 1 500 VA, cos φ = 1, P~ ≤ 750 VA, cos φ > 0.7
• IDC ≤ 6 A (Ex de 4 A) to DC 30 V, I DC ≤ 0.2 A to 125 V
According to IEC 61010, the following applies: Total voltage from relay outputs and power supply
≤ 300 V.
Use electronic insert FEL62 DC PNP for small DC load currents, e. g. for connection to a PLC.
Relay contact material: silver/nickel AgNi 90/10
When connecting a device with high inductance, provide a spark suppressor to protect the relay
contact. A fine-wire fuse (depending on the connected load) protects the relay contact in the event of
a short-circuit.
Both relay contacts switch simultaneously.
Behavior of output signal • OK status: Relay energized
• Demand mode: Relay de-energized
• Alarm: Relay de-energized

Liquiphant FTL64
12 Endress+Hauser
Terminal assignment
L1 N 4
3 5 8
7
6
U = 19...55 V DC
U 19...253 V AC
~
~
!
0.5 A
1
2 2
L1
L+
NO NONC NCC CN
L-
PE
1 2 3 64 75 8
MIN
>0,7
MAX
>0,5
COM
A0036062
 7 Universal current connection with relay output, electronic insert FEL64
1 When bridged, the relay output works with NPN logic
2 Connectable load
Behavior of switch output
and signaling
3 54
3 54
6 87
6 87
3 54
3
3
5
5
4
4
6 87
6
6
8
8
7
7
MAX
RD YE GN
MIN
A0033513
 8 Behavior of switch output and signaling, electronic insert FEL64
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED red for alarm
YE LED yellow, switch status
GN LED green, operational status, device on

Liquiphant FTL64
Endress+Hauser 13
DC connection, relay output (electronic insert FEL64 DC)
• Switches the loads via 2 potential-free changeover contacts
• Two galvanically isolated change-over contacts (DPDT), both change-over contacts switch
simultaneously
• Functional testing without level change. Functional testing of the entire device can be performed
using the test button on the electronic insert or with the test magnet (can be ordered as an option)
with the housing closed.
Supply voltage U = 9 to 20 VDC
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the device,
and limit the current to 500 mA, e. g. by installing a 0.5 A fuse (slow-blow) in the supply
circuit.
Power consumption P < 1.0 W
Connectable load Loads switched via 2 potential-free changeover contacts (DPDT)
• IAC ≤ 6 A (Ex de 4 A), U~ ≤ AC 253 V; P~ ≤ 1 500 VA, cos φ = 1, P~ ≤ 750 VA, cos φ > 0.7
• IDC ≤ 6 A (Ex de 4 A) to DC 30 V, I DC ≤ 0.2 A to 125 V
According to IEC 61010, the following applies: Total voltage from relay outputs and power supply
≤ 300 V
Preferably use electronic insert FEL62 DC PNP for low DC current loads, e. g. connection to a PLC.
Relay contact material: silver/nickel AgNi 90/10
When connecting a device with high inductance, provide spark quenching to protect the relay
contact. A fine-wire fuse (depending on the connected load) protects the relay contact in the event of
a short-circuit.
Behavior of output signal • OK status: Relay energized
• Demand mode: Relay de-energized
• Alarm: Relay de-energized
Terminal assignment
L+ L- 4
3 5 8
7
6
U = 9...20 V DC
!
0.5 A
1
2 2
L+ NO NONC NCC CL- PE
1 2 3 64 75 8
MIN
>0,7
MAX
>0,5
COM
A0037685
 9 DC connection with relay output, electronic insert FEL64 DC
1 When bridged, the relay output works with NPN logic
2 Connectable load

Liquiphant FTL64
14 Endress+Hauser
Behavior of switch output
and signaling
3 54
3 54
6 87
6 87
3 54
3
3
5
5
4
4
6 87
6
6
8
8
7
7
MAX
RD YE GN
MIN
A0033513
 10 Behavior of switch output and signaling, electronic insert FEL64 DC
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED red for alarm
YE LED yellow, switch status
GN LED green, operational status, device on
PFM output (electronic insert FEL67)
• For connecting to the Nivotester FTL325P and FTL375P switching units from Endress+Hauser
• PFM signal transmission; pulse frequency modulation, superimposed on the power supply along
the two-wire cabling
• Functional testing without level change:
• A functional test can be performed on the device using the test button on the electronic insert.
• The functional test can also be prompted by disconnecting the supply voltage or triggered
directly by the Nivotester FTL325P and FTL375P switching unit.
Supply voltage U = 9.5 to 12.5 VDC
Reverse polarity protection
Observe the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the device.
Power consumption P ≤ 150 mW with Nivotester FTL325P or FTL375P
Behavior of output signal • OK status: MAX operating mode 150 Hz, MIN operating mode 50 Hz
• Demand mode: MAX operating mode 50 Hz, MIN operating mode 150 Hz
• Alarm: MAX/MIN operating mode 0 Hz

Liquiphant FTL64
Endress+Hauser 15
Terminal assignment
>0,5
COM
MIN
MAX >0,7
– +
1
2
L- L+
!
!
7
33
37
d4
z4
8
34
38
d2
z2
z6 d6
.
-
1 2
A0036065
 11 PFM output, electronic insert FEL67
7/ 8: Nivotester FTL325P 1 CH, FTL325P 3 CH input 1
33/ 34: Nivotester FTL325P 3 CH input 2
37/ 38: Nivotester FTL325P 3 CH input 3
d4/ d2: Nivotester FTL375P input 1
z4/ z2: Nivotester FTL375P input 2
z6/ d6: Nivotester FTL375P input 3
Connection cable • Maximum cable resistance: 25 Ω per core
• Maximum cable capacitance: < 100 nF
• Maximum cable length: 1 000 m (3 281 ft)

Liquiphant FTL64
16 Endress+Hauser
Behavior of switch output
and signaling
MAX
RD YE GN
MIN
1
1
1
1
1
2
2
2
2
2
L+
L+
L+
L+
L+
150 Hz
50 Hz
50 Hz
150 Hz
0 Hz
L-
L-
L-
L-
L-
A0037696
 12 Switching behavior and signaling, electronic insert FEL67
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED red for alarm
YE LED yellow, switch status
GN LED green, operational status, device on
The switches for MAX/MIN on the electronic insert and the FTL325P switching unit must be
set according to the application. Only then is it possible to perform the functional test correctly.
2-wire NAMUR > 2.2 mA/ < 1.0 mA (electronic insert
FEL68)
• For connection to the isolating switch repeater as per NAMUR (IEC 60947-5-6), e. g. Nivotester
FTL325N from Endress+Hauser
• Signal transmission H-L edge 2.2 to 3.8 mA/0.4 to 1.0 mA as per IEC 60947-5-6 (NAMUR) on
two-wire cabling
• Functional testing without level change. A functional test can be performed on the device using
the test button on the electronic insert or using the test magnet (can be ordered as an option) with
the housing closed.
The functional test can also be triggered by interrupting the supply voltage or activated directly
from the Nivotester FTL325N.
Supply voltage U = 8.2 VDC
Pay attention to the following as per IEC/EN61010-1: Provide a suitable circuit breaker for the
device.
Power consumption NAMUR IEC 60947-5-6
Behavior of output signal • OK status: output current 2.2 to 3.8 mA
• Demand mode: output current 0.4 to 1.0 mA
• Alarm: output current 1.0 mA

Liquiphant FTL64
Endress+Hauser 17
Terminal assignment
>0,5
COM
– +
MIN
MAX >0,7
IEC 60947-5-6
8,2 V DC NAMUR
1
2
L- L+ .
-
1 2
!
!
A0036066
 13 2-wire NAMUR ≥ 2.2 mA/≤ 1.0 mA, electronic insert FEL68
Behavior of switch output
and signaling
MAX
RD YE GN
MIN
1
1
1
1
1
2
2
2
2
2
L+
L+
L+
L+
L+
2.2...3.8 mA
0.4...1.0 mA
2.2...3.8 mA
0.4...1.0 mA
< 1.0 mA
L-
L-
L-
L-
L-
A0037694
 14 Behavior of switch output and signaling, electronic insert FEL68
MAXDIP switch for setting MAX safety mode
MIN DIP switch for setting MIN safety mode
RD LED red for alarm
YE LED yellow, switch status
GN LED green, operational status, device on
Use of electronic insert FEL68 (2-wire NAMUR) in conjunction with Bluetooth or
Heartbeat Verification + Monitoring
Ordering information in the Product Configurator:
• Order code for "Accessories", option NG "Prepared for Bluetooth"
• Order code for "Application package", option EL "Prepared for Heartbeat Verification +
Monitoring"
The order number of the Bluetooth module, including the required battery, are subsequently
displayed in the Product Configurator.
Order options that must be selected together, or that are mutually exclusive, are automatically
displayed in the Product Configurator.

Liquiphant FTL64
18 Endress+Hauser
LED module VU120 (optional)
Supply voltage U = 12 to 55 VDC,
U = 19 to 253 VAC, 50 Hz/60 Hz
Power consumption P ≤ 0.7 W, S < 6 VA
Current consumption Imax = 0.4 A
Signaling of operational
status
MAX
RD
YE
GN
MIN
RD
GN YE
A0039258
 15 LED module, the LED lights up in green (GN), yellow (YE) or red (RD)
A brightly lit LED indicates the operational status (switch status or alarm status). The LED module
can be connected to the following electronic inserts: FEL62, FEL64, FEL64DC.
See the accompanying Operating Instructions for more detailed information on connection and
the switching states. The documentation currently available can be found on the
Endress+Hauser website: www.endress.com → Downloads.
Bluetooth module and Heartbeat Technology
Bluetooth module VU121
(optional)
Contains
FCC ID:
IC:
A0039257
 16 Bluetooth module VU121
• The Bluetooth module can be connected via the COM interface to the following electronic inserts:
FEL61, FEL62, FEL64, FEL64 DC, FEL67, FEL68 (2-wire NAMUR).
• The Bluetooth module is only available in conjunction with the Heartbeat Verification +
Monitoring application package.
• The Bluetooth module with battery is suitable for use in hazardous areas.
• The Bluetooth module must be ordered separately, including the required battery, for use in
conjunction with electronic insert FEL68 (2-wire NAMUR).

Liquiphant FTL64
Endress+Hauser 19
Batteries
The battery is categorized as dangerous goods when transported by air and may not be installed
in the device when shipped.
Replacement batteries can be purchased from a specialist retailer. Only the following types of
AA 3.6 V lithium batteries made by the manufacturers listed below are suitable as replacement
batteries:
• SAFT LS14500
• TADIRAN SL-360/s
• XENOENERGY XL-060F
Special battery in conjunction with electronic insert FEL68 (2-wire NAMUR)
• For energy-related reasons, the Bluetooth module VU121 requires a special battery when operated
with electronics insert FEL68 (2-wire NAMUR).
• The service life of the Bluetooth module without replacing the battery is at least 5 years with a
maximum of 60 downloads of complete datasets (at ambient temperatures between
10 to 40 °C (50 to 104 °F)).
Approvals
The Bluetooth module is approved for use in the following types of protection for devices: Ex i, Ex d,
Ex e or Ex t. The temperature class of the device is limited to T4 to T1 if the Bluetooth module is
used in type of protection Ex i /IS in conjunction with electronic insert FEL68 (2-wire NAMUR) and
the required battery in the Bluetooth module.
Additional technical data
• Free-field range: 50 m (165 ft) max.
• Operation radius with intervisibility around the device: 10 m (33 ft)
For documentation on radio approvals, see the Endress+Hauser website: www.endress.com →
Downloads.
Functions
 Additional details in the "Operability" section.
Heartbeat Technology Heartbeat Technology module
The software package consists of 3 modules. These three modules combined check, evaluate and
monitor device functionality and process conditions.
• Heartbeat Diagnostics
• Heartbeat Verification
• Heartbeat Monitoring
 For more detailed information, see the "Application packages" section.
Performance characteristics
Reference operating
conditions
• Ambient temperature:+23 °C (+73 °F)
• Process temperature: +23 °C (+73 °F) ±5 °C (9 °F)
• Density (water): 1 g/cm3
• Medium viscosity: 1 mPa⋅s
• Process pressure: unpressurized
• Sensor installation: vertically from above
• Density selection switch: > 0.7 g/cm3 (SGU)
• Switch direction of sensor: uncovered to covered
Take switch point into consideration
The following are typical switch points, depending on the orientation of the point level switch.

Liquiphant FTL64
20 Endress+Hauser
(Water +23 °C (+73 °F)).
Minimum distance between the fork tip and the tank wall or pipe wall: 10 mm (0.39 in)
~13 (0.5)
~5 (0.2)
~12.5 (0.49)
D
A B C
D
D
A0044069
 17 Typical switch points. Unit of measurement mm (in)
A Installation from above
B Installation from below
C Installation from the side
D Switch point
Measured error At reference operating conditions: –1 to +1 mm (–0.04 to +0.04 in)
Hysteresis At reference operating conditions: 2.5 mm (0.1 in)
Non-repeatability At reference operating conditions: 0.3 mm (0.01 in)
Influence of the process
temperature
The switch point moves between +1.4 to –5.5 mm (+0.06 to –0.22 in) in the temperature range
from –60 to +280 °C (–76 to +536 °F)
Influence of the process
pressure
The switch point moves between 0 to –3.9 mm (0 to –0.15 in) in the pressure range from
–1 to +100 bar (14.5 to 1 450 psi)
Installation
Open the device only in a dry environment!
Mounting location,
orientation
• Any orientation for device with short pipe up to approx. 500 mm (19.7 in)
• Vertical orientation for device with long pipe
• Minimum distance between the fork tip and the tank wall or pipe wall: 10 mm (0.39 in)