Endress+Hauser Liquiphant FTL51B Technical specifications

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Brief Operating Instructions
Liquiphant FTL51B
Vibronic
Point level switch for liquids
These Instructions are Brief Operating Instructions; they are
not a substitute for the Operating Instructions pertaining to
the device.
Detailed information about the device can be found in the
Operating Instructions and the other documentation:
Available for all device versions via:
• Internet: www.endress.com/deviceviewer
• Smart phone/tablet: Endress+Hauser Operations App
KA01429F/00/EN/02.21
71515031
2021-01-25

Liquiphant FTL51B
2 Endress+Hauser
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0023555

Liquiphant FTL51B Table of contents
Endress+Hauser 3
Table of contents
1 About this document .............................................................. 3
1.1 Symbols ............................................................................. 3
2 Basic safety instructions .......................................................... 5
2.1 Requirements for the personnel ............................................................ 5
2.2 Designated use ........................................................................ 5
2.3 Workplace safety ...................................................................... 5
2.4 Operational safety ......................................................................5
2.5 Product safety ......................................................................... 6
2.6 IT security ............................................................................ 6
3 Incoming acceptance and product identification ................................... 6
3.1 Incoming acceptance .................................................................... 6
3.2 Product identification ................................................................... 7
3.3 Storage and transport ................................................................... 7
4 Mounting ......................................................................... 8
4.1 Mounting conditions .................................................................... 9
4.2 Mounting the measuring device ...........................................................13
4.3 Sliding sleeves ....................................................................... 15
4.4 Post-installation check ................................................................. 15
5 Electrical connection ............................................................ 16
5.1 Connection conditions ................................................................. 16
5.2 Connecting the measuring device ......................................................... 16
5.3 Post-connection check ..................................................................35
6 Operation options ............................................................... 36
6.1 Overview of operation options ........................................................... 36
6.2 LED module VU120 (optional) ............................................................38
7 Commissioning .................................................................. 38
7.1 Function check ....................................................................... 38
7.2 Switching on the measuring device ........................................................ 39
7.3 Establishing a connection via SmartBlue (app) ............................................... 39
7.4 Further information ................................................................... 39
1 About this document
1.1 Symbols
1.1.1 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.

About this document Liquiphant FTL51B
4 Endress+Hauser
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.
1.1.2 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.
1.1.3 Tool symbols
Flat-blade screwdriver
Allen key
Open-ended wrench
1.1.4 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
1.1.5 Symbols in graphics
A, B, C ... View
1, 2, 3 ... Item numbers
-
Hazardous area
.
Safe area (non-hazardous area)

Liquiphant FTL51B Basic safety instructions
Endress+Hauser 5
2 Basic safety instructions
2.1 Requirements for the personnel
The personnel must fulfill the following requirements to carry out the necessary tasks, e. g.,
commissioning and maintenance:
‣Trained, qualified specialists must have a relevant qualification for the specific function
and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣Must have read and understood the instructions in the manual and supplementary
documentation
‣Follow instructions and comply with conditions
2.2 Designated use
• Only use the measuring device as a limit switch for liquids
• Improper use can pose hazards
• Ensure that the measuring device is free of defects while it is in operation
• Use the measuring device only for media to which the process-wetted materials have an
adequate level of resistance
•Do not exceed or drop below the limit values for the measuring device  TI01403F/00/EN
2.2.1 Incorrect use
The manufacturer is not liable for damage caused by improper or non-designated use.
Residual risks
Due to heat transfer from the process, the temperature of the electronics housing and the
assemblies contained therein may rise to 80 °C (176 °F) during operation.
Danger of burns from contact with surfaces!
‣If necessary, ensure protection against contact to prevent burns.
For requirements concerning functional safety in accordance with IEC 61508, the associated
SIL documentation must be observed.
2.3 Workplace safety
For work on and with the device:
‣Wear the required protective equipment according to federal/national regulations.
2.4 Operational safety
Risk of injury!
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for ensuring failure-free operation of the device.

Incoming acceptance and product identification Liquiphant FTL51B
6 Endress+Hauser
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers.
‣If, despite this, modifications are required, consult with Endress+Hauser.
Repair
To ensure continued operational safety and reliability:
‣Only perform repair work on the device if this is expressly permitted.
‣Observe federal/national regulations pertaining to the repair of an electrical device.
‣Use original spare parts and accessories from Endress+Hauser only.
2.5 Product safety
This measuring device is designed in accordance with good engineering practice to meet state-
of-the-art safety requirements, has been tested, and left the factory in a condition in which it
is safe to operate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser confirms
this by affixing the CE mark to the device.
2.6 IT security
 For more information, see Operating Instructions.
3 Incoming acceptance and product identification
3.1 Incoming acceptance
Check the following during goods acceptance:
 Are the order codes on the delivery note and the product sticker identical?
 Are the goods undamaged?
 Do the nameplate data match the ordering information on the delivery note?
 If required (see nameplate): Are the Safety Instructions, e. g. XA, provided?
 Is the device properly secured?
If one of these conditions is not met, please contact the manufacturer's sales office.

Liquiphant FTL51B Incoming acceptance and product identification
Endress+Hauser 7
3.2 Product identification
The measuring device can be identified in the following ways:
• Nameplate data
• Extended order code with breakdown of the device features on the delivery note
• Enter serial number from nameplates in W@M Device Viewer
(www.endress.com/deviceviewer): All the information about the measuring device and an
overview of the Technical Documentation supplied are displayed.
• Enter the serial number on the nameplate into the Endress+Hauser Operations App or use
the Endress+Hauser Operations App to scan the 2-D matrix code (QR Code) on the
nameplate
3.2.1 Nameplate
Order code: Ser. no.:
Ext. ord. cd.:
L:
FW:
Dev.Rev.:
Pmax:
0.83 W PNP
4
55
8
6
8
1
2
3
9
7
A0038187
 1 Nameplate specifications
1 Trademark (Endress+Hauser)
2 Trade name (Device name)
3 Manufacturer's address (Certificate holder)
4 Production location (Assembly plant)
5 Order number, extended order code, serial number
6 Technical data, degree of protection
7 Firmware version, hardware version
8 Approval-related information, reference to Safety Instructions (XA)
9 DataMatrix code (information about the device)
3.2.2 Manufacturer address
Endress+Hauser SE+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Place of manufacture: See nameplate.
3.3 Storage and transport
3.3.1 Storage conditions
Use original packaging.

Mounting Liquiphant FTL51B
8 Endress+Hauser
Storage temperature
–40 to +80 °C (–40 to +176 °F)
Optional: –50 °C (–58 °F), –60 °C (–76 °F)
3.3.2 Transporting the device
• Transport the device to the measuring point in the original packaging
• Hold the device by the housing, temperature spacer, flange or extension pipe
• Do not bend, shorten or extend the tuning fork
A0034846
 2 Handling the device during transportation
4 Mounting
LWARNING
Loss of protection rating if the device is opened in a wet environment.
‣Only open the device in a dry environment!
Mounting instructions
• 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)

Liquiphant FTL51B Mounting
Endress+Hauser 9
1
A0037879
 3 Installation examples for a vessel, tank or pipe
1 Temperature spacer/pressure-tight feedthrough (optional) for tank with insulation and/or high
process temperatures
4.1 Mounting conditions
4.1.1 Take switch point into consideration
Typical switch points, depending on the orientation of the point level switch
(water +23 °C (+73 °F))
~13 (0.5)
~4 (0.16)
~12.5 (0.49)
D
A B C
D
D
A0037915
 4 Typical switch points. Unit of measurement mm (in)
A Installation from above
B Installation from below
C Installation from the side
D Switch point

Mounting Liquiphant FTL51B
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4.1.2 Take viscosity into consideration
Low viscosity
Low viscosity, e.g. water: < 2 000 mPa⋅s
It is permitted to position the tuning fork within the installation socket.
> 25 (0.98)
D
A0033297
 5 Installation example for low-viscosity liquids. Unit of measurement mm (in)
D Diameter of installation socket: at least 50 mm (2.0 in)
High viscosity
NOTICE
Highly viscous liquids may cause switching delays.
‣Make sure that the liquid can run off the tuning fork easily.
‣Deburr the socket surface.
High viscosity, e.g. viscous oils: < 10 000 mPa⋅s
The tuning fork must be located outside the installation socket!
> 40 (1.57)
A0037348
 6 Installation example for a highly viscous liquid. Unit of measurement mm (in)

Liquiphant FTL51B Mounting
Endress+Hauser 11
4.1.3 Avoid buildup
• Use short installation sockets to ensure that the turning fork can project freely into the
vessel
• Install preferably flush mount on vessels or in pipes
• Leave sufficient distance between the buildup expected on the tank wall and the tuning fork
A0033239
 7 Installation examples for a highly viscous process medium
4.1.4 Take clearance into consideration
Allow sufficient space outside the tank for mounting, connection and settings involving the
electronic insert.

Mounting Liquiphant FTL51B
12 Endress+Hauser
A0033236
 8 Take clearance into consideration
4.1.5 Support the device
Support the device in the event of severe dynamic load. Maximum lateral loading capacity of
the pipe extensions and sensors: 75 Nm (55 lbf ft).
A0031874
 9 Examples of support in the event of dynamic load

Liquiphant FTL51B Mounting
Endress+Hauser 13
4.1.6 Weld-in adapter with leakage hole
Weld in the welding neck in such a way that the leakage hole is pointing downwards. This
enables any leaks to be detected quickly.
316L
A0039230
 10 Weld-in adapter with leakage hole
4.2 Mounting the measuring device
4.2.1 Required tools
Open-ended wrench, Allen key
4.2.2 Installation
Horizontal installation in vessels
Align the tuning fork with the marking
316L/G1
A0039125
 11 Markings to align the tuning fork
Use the marking to align the tuning fork in such a way that medium can run off easily and
deposit buildup is avoided.
Markings may include the following:
• Material specification, thread description or circle on the hexagonal nut or on the weld-in
adapter
• The II symbol on the back of the flange or Tri-Clamp

Mounting Liquiphant FTL51B
14 Endress+Hauser
Installing in pipes
• Flow velocities up to 5 m/s at a viscosity of 1 mm2/s(cSt) and density 1 g/cm3 (SGU)
Check for correct functioning in the event of other process medium conditions.
• The flow will not be significantly impeded if the tuning fork is correctly aligned and the
marking is pointing in the direction of flow.
• The marking can be identified while the device is installed
A0034851
 12 Marking and fork position
Screwing in the device
2.
1.
A0034852
 13 Screwing in the device
• Turn by the hex bolt only, 15 to 30 Nm (11 to 22 lbf ft)
• Do not turn at the housing!

Liquiphant FTL51B Mounting
Endress+Hauser 15
Aligning the cable entry
1. 3.
40.7 Nm
2.
A0037347
 14 Housing with external locking screw
The locking screw is not tightened when the device is delivered.
1. Loosen the external locking screw (maximum 1.5 turns).
2. Turn the housing, align the cable entry.
3. Tighten the external locking screw.
4.3 Sliding sleeves
For more information, see Operating Instructions.
4.4 Post-installation check
 Is the measuring device undamaged (visual inspection)?
 Does the measuring device conform to the measuring point specifications?
For example:
• Process temperature
• Process pressure
• Ambient temperature range
• Measuring range
 Are the measuring point number and labeling correct (visual inspection)?
Is the measuring device adequately protected against precipitation and direct sunlight?
 Is the device properly secured?

Electrical connection Liquiphant FTL51B
16 Endress+Hauser
5 Electrical connection
5.1 Connection conditions
5.1.1 Cover with securing screw
In the case of devices for use in the hazardous area with a certain type of protection, the cover
is sealed by a securing screw.
NOTICE
If the securing screw is not positioned correctly when the cover is screwed closed, the
cover cannot provide secure sealing.
‣Before unscrewing the cover, make sure that the securing screw does not protrude too far
over the edge of the cover. Loosen the securing screw with a maximum of 2 turns.
‣Pay attention to the position of the securing screw when screwing the cover closed.
2 x
A0039520
 15 Cover with securing screw
5.1.2 Connecting protective earth (PE)
The protective earth conductor at the device must only be connected if the device's operating
voltage is ≥ 35 VDC or ≥ 16 VACeff.
When the device is used in hazardous areas, it must always be included in the potential
equalization of the system, irrespective of the operating voltage.
The plastic housing is available with or without an external protective earth connection
(PE). If the operating voltage of the electronic insert is < 35 V, the plastic housing has no
external protective earth connection.
5.2 Connecting the measuring device
5.2.1 Required tools
Flat blade screwdriver

Liquiphant FTL51B Electrical connection
Endress+Hauser 17
5.2.2 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.

Electrical connection Liquiphant FTL51B
18 Endress+Hauser
!
>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
 16 2-wire AC, electronic insert FEL61

Liquiphant FTL51B Electrical connection
Endress+Hauser 19
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
 17 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

Electrical connection Liquiphant FTL51B
20 Endress+Hauser
Selection tool for relays
3.0
1.5
1.3
20 24 27 43 48 53 60 110 121 207 230 253
S
U
A0042052
 18 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
5.2.3 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.