Endress+Hauser Liquiphant FTL51B Technical specifications

Products Solutions Services
Brief Operating Instructions
Liquiphant FTL51B
Vibronic
HART
Point level switch for liquids
These Brief Operating Instructions are not a substitute for the
Operating Instructions pertaining to the device.
Detailed information is provided in the Operating Instructions
and other documentation.
Available for all device versions via:
• Internet: www.endress.com/deviceviewer
• Smartphone/tablet: Endress+Hauser Operations app
KA01557F/00/EN/02.23-00
71630439
2023-11-30

Related documents Liquiphant FTL51B HART
2 Endress+Hauser
1 Related documents
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 HART About this document
Endress+Hauser 3
2 About this document
2.1 Symbols
2.1.1 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.
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.
2.1.2 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.
2.1.3 Tool symbols
Flat-blade screwdriver
Allen key
Open-ended wrench
2.1.4 Communication-specific symbols
Bluetooth
Wireless data transmission between devices over a short distance.
2.1.5 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

Basic safety instructions Liquiphant FTL51B HART
4 Endress+Hauser
Reference to documentation
A
Reference to another section
1.
,
2.
,
3.
Series of steps
2.1.6 Symbols in graphics
A, B, C ... View
1, 2, 3 ... Item numbers
-
Hazardous area
.
Safe area (non-hazardous area)
2.1.7 Registered trademarks
HART®
Registered trademark of the FieldComm Group, Austin, Texas, USA
Bluetooth®
The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG,
Inc. and any use of such marks by Endress+Hauser is under license. Other trademarks and
trade names are those of their respective owners.
Apple®
Apple, the Apple logo, iPhone, and iPod touch are trademarks of Apple Inc., registered in the
U.S. and other countries. App Store is a service mark of Apple Inc.
Android®
Android, Google Play and the Google Play logo are trademarks of Google Inc.
3 Basic safety instructions
3.1 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
3.2 Intended use
• Only use the device for liquids
• Improper use can pose hazards
• Ensure that the measuring device is free of defects while it is in operation

Liquiphant FTL51B HART Basic safety instructions
Endress+Hauser 5
• Use the device only for media to which the wetted materials have an adequate level of
resistance
• Do not exceed or drop below the relevant limit values for the device
For more details, see the Technical Documentation
3.2.1 Incorrect use
The manufacturer is not liable for damage caused by improper or non-intended 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.
3.3 Workplace safety
For work on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
3.4 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 the interference-free operation of the device.
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.
Hazardous area
To eliminate danger to persons or the facility when the device is used in the hazardous area
(e.g. explosion protection):
‣Check the nameplate to verify whether the ordered device can be used for the intended
purpose in the hazardous area.
‣Observe the specifications in the separate supplementary documentation that is an integral
part of this manual.

Incoming acceptance and product identification Liquiphant FTL51B HART
6 Endress+Hauser
3.5 Product safety
This 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 the general safety standards and legal requirements. It also complies with the EU
directives listed in the device-specific EU Declaration of Conformity. Endress+Hauser confirms
this by affixing the CE mark to the device.
3.6 Functional Safety SIL (optional)
The Functional Safety Manual must be strictly observed for devices that are used in functional
safety applications.
3.7 IT security
For more information, see the Operating Instructions.
4 Incoming acceptance and product identification
4.1 Incoming acceptance
Check the following during incoming acceptance:
 Are the order codes on the delivery note and the product sticker identical?
 Are the goods undamaged?
 Do the data on the nameplate match the ordering information on the delivery note?
 If required (see nameplate): are the Safety Instructions e.g. XA provided?
If one of these conditions is not met, please contact the manufacturer's sales office.
4.2 Product identification
The device can be identified in the following ways:
• Nameplate specifications
• 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 of the information on the measuring device is
displayed along with an overview of the scope of technical documentation provided.
• Enter the serial number on the nameplate into the Endress+Hauser Operations app or scan
the 2-D matrix code on the nameplate with the Endress+Hauser Operations app
4.2.1 Electronic insert
Identify the electronic insert via the order code on the nameplate.

Liquiphant FTL51B HART Incoming acceptance and product identification
Endress+Hauser 7
4.2.2 Nameplate
The information that is required by law and is relevant to the device is shown on the
nameplate.
4.2.3 Manufacturer address
Endress+Hauser SE+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Place of manufacture: See nameplate.
4.3 Storage and transport
4.3.1 Storage conditions
Use original packaging.
Storage temperature
–40 to +80 °C (–40 to +176 °F)
Optional: –50 °C (–58 °F), –60 °C (–76 °F)
4.3.2 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
 1 Handling the device during transportation

Mounting Liquiphant FTL51B HART
8 Endress+Hauser
5 Mounting
Mounting instructions
• Any orientation for compact version or version with a pipe length of up to
500 mm (19.7 in)approx.
• Vertical orientation from above for device with long pipe
• Minimum distance between the tuning fork and the tank wall or pipe wall: 10 mm (0.39 in)
A0037879
 2 Installation examples for a vessel, tank or pipe
5.1 Mounting requirements
5.1.1 Take switch point into consideration
The following are typical switch points, depending on the orientation of the point level switch.
Water +23 °C (+73 °F)
Minimum distance between the tuning fork and the tank wall or pipe wall:
10 mm (0.39 in)

Liquiphant FTL51B HART Mounting
Endress+Hauser 9
~13 (0.5)
~4 (0.16)
~12.5 (0.49)
D
A B C
D
D
A0037915
 3 Typical switch points. Unit of measurement mm (in)
A Installation from above
B Installation from below
C Installation from the side
D Switch point
5.1.2 Take viscosity into consideration
Viscosity values
• Low viscosity : < 2 000 mPa⋅s
• High viscosity: > 2 000 to 10 000 mPa⋅s
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)
> !50 (1.97)
A0033297
 4 Installation example for low-viscosity liquids. Unit of measurement mm (in)

Mounting Liquiphant FTL51B HART
10 Endress+Hauser
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
 5 Installation example for a highly viscous liquid. Unit of measurement mm (in)
5.1.3 Avoid buildup
• Use short installation sockets to ensure that the tuning fork projects freely into the vessel
• Leave sufficient distance between the buildup expected on the tank wall and the tuning fork

Liquiphant FTL51B HART Mounting
Endress+Hauser 11
A0033239
 6 Installation examples for a highly viscous process medium
5.1.4 Take clearance into consideration
Allow sufficient space outside the tank for mounting, connection and settings involving the
electronic insert.
A0033236
 7 Take clearance into consideration

Mounting Liquiphant FTL51B HART
12 Endress+Hauser
5.1.5 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
 8 Examples of support in the event of dynamic load
Marine approval: In the case of pipe extensions or sensors longer than 1 600 mm (63 in),
a support is needed at least every 1 600 mm (63 in).
5.1.6 Weld-in adapter with leakage hole
Weld in the weld-in adapter in such a way that the leakage hole is pointing downwards. This
enables any leaks to be detected quickly.
316L
A0039230
 9 Weld-in adapter with leakage hole

Liquiphant FTL51B HART Mounting
Endress+Hauser 13
5.2 Mounting the device
5.2.1 Required tool
• Open-ended wrench for sensor installation
• Allen key for housing locking screw
5.2.2 Aligning the tuning fork using the marking
316L/G1
A0039125
 10 Position of the tuning fork when installed horizontally in the vessel using the marking
5.2.3 Installing the device in piping
• Flow velocity up to 5 m/s with a viscosity of 1 mPa⋅s and density of 1 g/cm³ (62.4 lb/ft³)
(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 is visible when installed
A0034851
 11 Installation in pipes (take fork position and marking into consideration)

Mounting Liquiphant FTL51B HART
14 Endress+Hauser
5.2.4 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!
2.
1.
A0034852
 12 Screwing in the device
5.2.5 Aligning the cable entry
1. 3.
43.5 Nm
2.
A0037347
 13 Housing with external locking screw and drip loop
Housings with locking screw:
• The housing can be turned and the cable aligned by turning the 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.
 Avoid moisture in the housing, provide a loop to allow moisture to drain off.
3. Tighten the external locking screw.
5.2.6 Turning the housing
The housing can be rotated up to 380° by loosening the locking screw.

Liquiphant FTL51B HART Mounting
Endress+Hauser 15
NOTICE
The housing cannot be unscrewed fully.
‣Loosen the external locking screw by a maximum of 1.5 turns. If the screw is unscrewed
too much or completely (beyond the screw anchor point), small parts (counter disk) can
become loose and fall out.
‣Tighten the securing screw (hexagon socket 4 mm (0.16 in)) with maximum
3.5 Nm (2.58 lbf ft)±0.3 Nm (±0.22 lbf ft).
5.2.7 Closing the housing covers
NOTICE
Thread and housing cover damaged from dirt and fouling!
‣Remove dirt (e.g. sand) on the thread of the covers and housing.
‣If you continue to encounter resistance when closing the cover, check the thread again for
fouling.
Housing thread
The threads of the electronics and connection compartment can be coated with an anti-
friction coating.
The following applies for all housing materials:
Do not lubricate the housing threads.
5.2.8 Turning the display module
LWARNING
Supply voltage switched on!
Risk of electric shock and/or explosion!
‣Switch off the supply voltage before opening the device.
2.
1.
40.7 Nm
3.
4.
A0038224
1. If fitted: release the screw of the cover lock for the electronics compartment cover using
the Allen key.
2. Unscrew the cover from the housing and inspect the cover seal.
3. Press the release mechanism and remove the display module.

Electrical connection Liquiphant FTL51B HART
16 Endress+Hauser
4. Turn the display module to the desired position: maximum 4 × 90 ° in each direction.
Insert the display module into the desired position until it clicks into place. Screw the
cover tightly back onto the housing. If fitted: tighten the screw of the cover lock using
the Allen key 0.7 Nm (0.52 lbf ft) ±0.2 Nm (±0.15 lbf ft).
In the case of a dual-compartment housing, the display can be mounted in the
electronics compartment as well as in the connection compartment.
6 Electrical connection
6.1 Required tool
• Screwdriver for electrical connection
• Allen key for screw of cover lock
6.2 Connecting requirements
6.2.1 Cover with securing screw
The cover is locked by a securing screw in devices for use in hazardous areas with certain
explosion protection.
NOTICE
If the securing screw is not positioned correctly, the cover cannot provide secure sealing.
‣Open the cover: slacken the screw of the cover lock with a maximum of 2 turns so that the
screw does not fall out. Fit the cover and check the cover seal.
‣Close the cover: screw the cover securely onto the housing, making sure that the securing
screw is positioned correctly. There should not be any gap between the cover and housing.
2 x 0.7 Nm
4
A0039520
 14 Cover with securing screw

Liquiphant FTL51B HART Electrical connection
Endress+Hauser 17
6.2.2 Potential equalization
LWARNING
Explosion Hazard!
‣Please refer to the separate documentation on applications in hazardous areas for the
safety instructions.
1
A0045830
1 Ground terminal for connecting the potential matching line
If necessary, the potential matching line can be connected to the external ground
terminal of the transmitter before the device is connected.
For optimum electromagnetic compatibility:
• Potential matching line as short as possible
• Observe a cross-section of at least 2.5 mm2 (14 AWG)
6.3 Connecting the device
1
A0046355
1 Connection compartment cover
Housing thread
The threads of the electronics and connection compartment can be coated with an anti-
friction coating.
The following applies for all housing materials:
Do not lubricate the housing threads.

Electrical connection Liquiphant FTL51B HART
18 Endress+Hauser
6.3.1 Supply voltage
• U = 10.5 to 35 VDC (Ex d, Ex e, non-Ex)
• U = 10.5 to 30 VDC (Ex i)
• Rated current: 4 to 20 mA HART
• The power unit must be tested to ensure it meets safety requirements (e.g. PELV,
SELV, Class 2) and must comply with the relevant protocol specifications.
• Comply with the following according to IEC/EN61010-1: provide a suitable circuit
breaker for the device.
6.3.2 Terminals
• Supply voltage and internal ground terminal: 0.5 to 2.5 mm2 (20 to 14 AWG)
• External ground terminal: 0.5 to 4 mm2 (20 to 12 AWG)
6.3.3 Cable specification
• The cable outer diameter depends on the cable entry used
• Cable outer diameter
• Plastic: ⌀5 to 10 mm (0.2 to 0.38 in)
• Nickel-plated brass: ⌀7 to 10.5 mm (0.28 to 0.41 in)
• Stainless steel: ⌀7 to 12 mm (0.28 to 0.47 in)
6.3.4 4 to 20 mA HART
2
3
4
Y+ +
- -
I
1
mA
A0028908
 15 Block diagram of HART connection
1 Device with HART communication
2 HART communication resistor
3 Power supply
4 Multimeter or ammeter
The HART communication resistor of 250 Ω in the signal line is always necessary in the
case of a low-impedance power supply.
Take the voltage drop into consideration:
Maximum 6 V for a 250 Ω communication resistor

Liquiphant FTL51B HART Electrical connection
Endress+Hauser 19
6.3.5 Wiring
LWARNING
Supply voltage might be connected!
Risk of electric shock and/or explosion!
‣If the device is used in hazardous areas, make sure to comply with national standards and
the specifications in the Safety Instructions (XAs). The specified cable gland must be used.
‣The supply voltage must match the specifications on the nameplate.
‣Switch off the supply voltage before connecting the device.
‣If necessary, the potential matching line can be connected to the outer ground terminal of
the transmitter before the device is connected.
‣A suitable circuit breaker should be provided for the device in accordance with IEC/EN
61010.
‣The cables must be adequately insulated, with due consideration given to the supply
voltage and the overvoltage category.
‣The connecting cables must offer adequate temperature stability, with due consideration
given to the ambient temperature.
‣Only operate the device with the covers closed.
Connect the device in the following order:
1. Release the cover lock (if provided).
2. Unscrew the cover.
3. Guide the cables into the cable glands or cable entries. Use a suitable tool with width
across flats AF24/25 (8 Nm (5.9 lbf ft)) for the M20 cable gland.
4. Connect the cable.
5. Tighten the cable glands or cable entries so that they are leak-tight. Counter-tighten the
housing entry.
6. Screw the cover securely back onto the connection compartment.
7. If fitted: tighten the screw of the cover lock using the Allen key 0.7 Nm (0.52 lbf ft)
±0.2 Nm (0.15 lbf ft).

Electrical connection Liquiphant FTL51B HART
20 Endress+Hauser
6.3.6 Terminal assignment
Single compartment housing
+
-
1
2
3
A0042594
 16 Connection terminals and ground terminal in the connection compartment
1 Positive terminal
2 Negative terminal
3 Internal ground terminal