Endress+Hauser Liquiphant FTL41 Technical specifications

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Brief Operating Instructions
Liquiphant FTL41
Vibronic
Point level switch in 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
KA01411F/00/EN/03.22-00
71566285
2022-04-05

Associated documentation Liquiphant FTL41
2 Endress+Hauser
1 Associated documentation
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
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

Liquiphant FTL41 About this document
Endress+Hauser 3
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 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
2.1.5 Symbols in graphics
A, B, C ... View
1, 2, 3 ... Item numbers
-
Hazardous area
.
Safe area (non-hazardous area)

Basic safety instructions Liquiphant FTL41
4 Endress+Hauser
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
• 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.

Liquiphant FTL41 Incoming acceptance and product identification
Endress+Hauser 5
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.
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.
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.

Mounting Liquiphant FTL41
6 Endress+Hauser
4.2 Product identification
The following options are available for the identification of the device:
• 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.
4.2.2 Nameplate
The information that is required by law and is relevant to the device is shown on the
nameplate.
4.3 Storage and transport
4.3.1 Storage conditions
Use original packaging.
Storage temperature
–40 to +80 °C (–40 to +176 °F)
Transporting the device
• Transport the device to the measuring point in the original packaging
• Hold the device by the housing, flange or extension pipe
Do not bend, shorten or extend the tuning fork.
5 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 from above for device with long pipe
• Minimum distance between the fork tip and the tank wall or pipe wall: 10 mm (0.39 in)

Liquiphant FTL41 Mounting
Endress+Hauser 7
A0036954
 1 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 fork tip and the tank wall or pipe wall: 10 mm (0.39 in)
~13 (0.5)
~4 (0.16)
~12.5 (0.49)
D
A B C
D
D
A0037915
 2 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 FTL41
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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
It is permitted to position the tuning fork within the installation socket.
> 25 (0.98)
> !50 (1.97)
A0033297
 3 Installation example for low-viscosity liquids. Unit of measurement mm (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.
The tuning fork must be located outside the installation socket!
> 40 (1.57)
A0037348
 4 Installation example for a highly viscous liquid. Unit of measurement mm (in)

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5.1.3 Avoid buildup
A0033239
 5 Installation examples for a highly viscous process medium
5.1.4 Take clearance into consideration
A0033236
 6 Take clearance outside the tank into consideration

Mounting Liquiphant FTL41
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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
 7 Examples of support in the event of dynamic load
Marine approval: In the case of pipe extensions or sensors longer than 1 600 mm, a
support is needed at least every 1 600 mm.
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
 8 Weld-in adapter with leakage hole

Liquiphant FTL41 Mounting
Endress+Hauser 11
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 Installation
Aligning the tuning fork using the marking
316L/G1
A0039125
 9 Markings to align the tuning fork
Installing in pipes
• Flow velocity up to 5 m/s with a viscosity of 1 mPa⋅s and density of 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 is visible when installed.
A0034851
 10 Installation in pipes (take fork position and marking into consideration)

Mounting Liquiphant FTL41
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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
 11 Screwing in the device
Aligning the cable entry
1. 3.
43.5 Nm
2.
A0037347
 12 Housing with external locking screw and drip loop
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.

Liquiphant FTL41 Electrical connection
Endress+Hauser 13
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
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, 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
 13 Cover with securing screw
6.2.2 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.
6.3 Connecting the device
Housing thread
The thread of the electronics and connection compartment is coated with lubricant
varnish.
Avoid additional lubrication.

Electrical connection Liquiphant FTL41
14 Endress+Hauser
6.3.1 3-wire DC-PNP (electronic insert FEL42)
• Three-wire DC version
• Switches the load via the transistor (PNP) and separate connection, e.g. in conjunction with
programmable logic controllers (PLC), DI modules according to EN 61131-2
Supply voltage
LWARNING
Failure to use the prescribed power unit.
Risk of potentially life-threatening electric shock!
‣The FEL42 may only be powered by power supply units with secure galvanic isolation in
accordance with IEC 61010-1.
U = 10 to 55 VDC
Comply with the following according to 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 power 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. Check for an overload or
short-circuit every 5 s.
Load current
I ≤ 350 mA with overload and short-circuit protection
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

Liquiphant FTL41 Electrical connection
Endress+Hauser 15
Terminal assignment
0.5 A
L+ L-
1
3
MIN
MAX >0,7
L-L+
U = 10...55 V DC
I max: 350 mA
>0,5
1
3
!
K
PE
1 2 3
B
4 3 1
2
1
34
M12
I 350 mA
max
U 55 V
max
K
IL
A
L+L-
K
A0036056
 14 Terminal assignment FEL42
A Terminal assignment at electronic insert
B Terminal assignment at M12 plug according to EN61131-2 standard

Electrical connection Liquiphant FTL41
16 Endress+Hauser
Behavior of the 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
 15 FEL42 switching behavior, signaling LED
MAXDIP switch for setting the MAX safety
MIN DIP switch for setting the MIN safety
RD LED red for warning or alarm
YE LED yellow, switch status
GN LED green, operational status, device on
ILLoad current switched through
6.3.2 Universal current connection with relay output (electronic insert FEL44)
• Switches the loads via 2 potential-free change-over contacts
• 2 separate change-over contacts (DPDT)
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 / 19 to 55 VDC
Comply with the following according to 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 power supply circuit.

Liquiphant FTL41 Electrical connection
Endress+Hauser 17
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, IDC ≤ 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 FEL42 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

Electrical connection Liquiphant FTL41
18 Endress+Hauser
Terminal assignment
L1
MIN
>0,7
MAX
>0,5
N 4
3 5 8
7
6
U = 19...55 V DC
U 19...253 V AC
~
~
!
0.5 A
12 2
L1
L+
NO NONC NCC CN
L-
PE
1 2 3 64 75 8
A0036057
 16 Universal current connection with relay output, electronic insert FEL44
1 When bridged, the relay output works with NPN logic
2 Connectable load

Liquiphant FTL41 Electrical connection
Endress+Hauser 19
Behavior of the 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
 17 FEL44 switching behavior, signaling LED
MAXDIP switch for setting the MAX safety
MIN DIP switch for setting the MIN safety
RD LED red for alarm
YE LED yellow, switch status
GN LED green, operational status, device on
6.3.3 2-wire NAMUR > 2.2 mA/< 1.0 mA (electronic insert FEL48)
• To connect to isolating amplifiers according to NAMUR (IEC 60947-5-6), e.g. Nivotester
FTL325N from Endress+Hauser
• To connect to isolating amplifiers of third-party suppliers according to NAMUR
(IEC 60947-5-6), a permanent power supply for the electronic insert FEL48 must be
ensured
• Signal transmission H-L edge 2.2 to 3.8 mA/0.4 to 1.0 mA according to NAMUR
(IEC 60947-5-6) on two-wire cabling
Supply voltage
U = 8.2 VDC
Comply with the following according to IEC/EN61010-1: provide a suitable circuit
breaker for the device.
Power consumption
P < 50 mW

Electrical connection Liquiphant FTL41
20 Endress+Hauser
Behavior output signal
• OK state: Current 2.2 to 3.8 mA
• Demand mode: Current 0.4 to 1.0 mA
• Alarm: Current 0.4 to 1.0 mA
Terminal assignment
"
– +
MIN
MAX >0,7
IEC 60947-5-6
8,2 V DC NAMUR
>0,5
1
2
!L-
I
H
L
L+
.
-
1 2
A0036058
 18 2-wire NAMUR ≥ 2.2 mA/≤ 1.0 mA, electronic insert FEL48