Endress+Hauser Liquiphant FTL31 User manual

Products Solutions Services
Operating Instructions
Liquiphant FTL31
Point level switch for liquids
BA01285F/00/EN/03.22-00
71578503
2022-07-12

Liquiphant FTL31
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 FTL31 Table of contents
Endress+Hauser 3
Table of contents
1 Document information ......... 4
1.1 Document function ................... 4
1.2 Symbols ............................ 4
1.3 Documentation ...................... 5
2 Basic safety instructions ....... 6
2.1 Requirements for the personnel ........ 6
2.2 Intended use ........................ 6
2.3 Workplace safety .................... 6
2.4 Operational safety ................... 7
2.5 Product safety ....................... 7
3 Product description ............. 8
3.1 Product design ....................... 8
4 Incoming acceptance and
product identification .......... 9
4.1 Incoming acceptance ................. 9
4.2 Product identification ................. 9
4.3 Manufacturer address ................ 9
4.4 Storage and transport ................. 9
5 Mounting ...................... 11
5.1 Mounting requirements .............. 11
5.2 Mounting the measuring device ....... 16
5.3 Post-mounting check ................ 17
6 Electrical connection .......... 18
6.1 Connecting the device ............... 18
6.2 Post-connection check ............... 27
7 Commissioning ................ 29
7.1 Function check ..................... 29
7.2 LED display ........................ 29
7.3 Function of LEDs ....................31
7.4 Function test with test magnet ........ 31
8 Diagnostics and
troubleshooting ............... 33
8.1 Diagnostic information via LED
display ............................ 33
9 Maintenance .................. 33
9.1 Cleaning ........................... 33
10 Repair .......................... 34
10.1 Spare parts ........................ 34
10.2 Return ............................ 34
10.3 Disposal ........................... 34
11 Accessories .................... 34
12 Technical data ................. 36
12.1 Power supply ....................... 36
12.2 Environment ....................... 36
12.3 Process ............................ 38

Document information Liquiphant FTL31
4 Endress+Hauser
1 Document information
1.1 Document function
These Operating Instructions contain all the information that is required in various phases of
the life cycle of the device: from product identification, incoming acceptance and storage, to
mounting, connection, operation and commissioning through to troubleshooting,
maintenance and disposal.
1.2 Symbols
1.2.1 Safety instructions
Symbol Meaning
DANGER
A0011189-EN
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING
A0011190-EN
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION
A0011191-EN
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE
A0011192-EN
NOTE!
This symbol contains information on procedures and other facts which do not result in personal
injury.
1.2.2 Electrical symbols
Symbol Meaning
)
A0011200
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a grounding system.
*
A0011199
Protective ground connection
A terminal which must be connected to ground prior to establishing any other connections.
1.2.3 Symbols for certain types of information
Symbol Meaning
A0011182
Permitted
Indicates procedures, processes or actions that are permitted.
A0011184
Forbidden
Indicates procedures, processes or actions that are forbidden.

Liquiphant FTL31 Document information
Endress+Hauser 5
Symbol Meaning
A0011193
Tip
Indicates additional information.
A0011194
Reference to documentation
Refers to the corresponding device documentation.
A0011195
Reference to page
Refers to the corresponding page number.
1.2.4 Symbols for graphics
Symbol Meaning
1, 2, 3 ... Item numbers
A, B, C, ... Views
1.2.5 Symbols for tools
Symbol Meaning
A0011222
Open-ended wrench
1.3 Documentation
The document types listed are available in the Download Area of the Endress+Hauser website:
www.endress.com → Download
Document Purpose and content of the document
Technical Information
TI01147F/00/EN
This document contains all the technical data for the device and provides an overview of
the accessories that can be ordered.
Additional documentation
TI00426F/00/EN
SD00352F/00/A6
SD00356F/00/EN
Weld-in adapter and flanges (overview)
Weld-in adapter G 1", G ¾" (installation instructions)
Valve plug (installation instructions)

Basic safety instructions Liquiphant FTL31
6 Endress+Hauser
2 Basic safety instructions
2.1 Requirements for the personnel
The personnel performing installation, commissioning, diagnostics and maintenance must
satisfy the following requirements:
• Trained, qualified specialists: must have a relevant qualification for this specific function
and task
• Are authorized by the plant owner/operator
• Are familiar with federal/national regulations
• Before starting work: read and understand the instructions in the manual and
supplementary documentation as well as the certificates (depending on the application)
• Follow instructions and comply with basic conditions
The operating personnel must satisfy the following requirements:
• Are instructed and authorized according to the requirements of the task by the facility's
owner-operator
• Follow the instructions in this manual
2.2 Intended use
The measuring device described in this manual may be used only as a point level switch for
liquids. Incorrect use may pose a hazard. To ensure that the measuring device remains in
perfect condition during the operating time:
• Measuring devices must be used only for media to which the process-wetted materials have
an adequate level of resistance.
• Comply with the limit values in the "Technical data" section.
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!
‣In the event of elevated fluid temperatures, ensure protection against contact to prevent
burns.
2.3 Workplace safety
For work on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
‣Switch off the supply voltage before connecting the device.

Liquiphant FTL31 Basic safety instructions
Endress+Hauser 7
2.4 Operational safety
Danger of injury!
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for the interference-free operation of the device.
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 the 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.

Product description Liquiphant FTL31
8 Endress+Hauser
3 Product description
The Liquiphant FTL31 is a point level switch for universal use in all liquids. It is used
preferably in storage tanks, mixing vessels and pipes.
3.1 Product design
The point level switch is available in different versions, which can be assembled in accordance
with user specifications. Examples in the graphic below:
ACD
B
A0022228
Versions
Examples
A B C D
Electrical connection Valve plug
Cable
(cannot be
disassembled)
M12 plug
for housing cover
IP66/68/69K
M12 plug
for housing cover
IP65/67
Housing (sensor design)
for process temperatures
up to:
100 °C (212 °F) 100 °C (212 °F) 150 °C (302 °F) 150 °C (302 °F)
Sensor type Compact
version Short tube version Compact version Short tube version
For detailed information on the short tube version and the process connections, see the
Technical Documentation TI01147F/00/EN.

Liquiphant FTL31 Incoming acceptance and product identification
Endress+Hauser 9
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 nameplate data match the ordering information on the delivery note?
 If required (see nameplate): Are the safety instructions (XA) provided?
If one of these conditions is not met, please contact the manufacturer's sales office.
4.2 Product identification
The following options are available for the identification of the measuring device:
• Nameplate specifications
• Extended order code with breakdown of the device features on the delivery note
‣Enter the serial number from the nameplates into W@M Device Viewer
(www.endress.com/deviceviewer)
 All the information about the measuring device and the scope of the associated
Technical Documentation are displayed.
‣Enter the serial number from the nameplate into the Endress+Hauser Operations App or
use the Endress+Hauser Operations App to scan the 2-D matrix code (QR Code) provided on
the nameplate
 All the information about the measuring device and the scope of the associated
Technical Documentation are displayed.
4.3 Manufacturer address
Endress+Hauser SE+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Place of manufacture: See nameplate.
4.4 Storage and transport
4.4.1 Storage conditions
• Permitted storage temperature: –40 to +85 °C (–40 to +185 °F)
• Use original packaging.
4.4.2 Transporting the product to the measuring point
Transport the device to the measuring point in the original packaging.

Incoming acceptance and product identification Liquiphant FTL31
10 Endress+Hauser
4.4.3 Handling of the device
NOTICE
Risk of injury! Housing or fork may become damaged or tear!
‣Transport the device to the measuring point in its original packaging or by the housing.
‣Do not hold the device by the fork!
‣Do not use the device as a ladder or climbing aid!
‣Do not bend the fork!
‣Do not shorten or lengthen the fork!
A0020845
 1 Handling of the device

Liquiphant FTL31 Mounting
Endress+Hauser 11
5 Mounting
5.1 Mounting requirements
5.1.1 Orientation
Installation is possible in any position in a vessel, pipe or tank.
1
2
3
A0036961
 2 Installation examples
1 Overfill prevention or upper level detection (maximum safety)
2 Dry running protection for pump (minimum safety)
3 Lower level detection (minimum safety)
5.1.2 Switch point
The switch point A on the sensor depends on the orientation of the point level switch (water
+25 °C (+77 °F), 1 bar (14.5 psi).
A
~30 (1.2)
A
A
~10.5(0.4)
~13 (0.5)
A0020734
 3 Orientation: vertical from above, vertical from below, horizontal; dimensions in mm (in)
5.1.3 Viscosity
Switching delays may occur in the case of highly viscous liquids. Make sure that the liquid can
easily run off the tuning fork:

Mounting Liquiphant FTL31
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• If installing in vessels with high-viscosity liquids (A), the tuning fork may not be located in
the installation socket!
• If installing in vessels with low-viscosity liquids (B), the tuning fork may be located in the
installation socket.
• The installation nozzle must be no less than the minimum diameter of 50 mm (2.0 in).
ø50 (2.0)³
AB
A0022054
 4 Installation options with consideration given to the liquid viscosity, dimensions in mm (in)
A High viscosity (< 10 000 mPa·s)
B Low viscosity (< 2 000 mPa·s)
5.1.4 Buildup
Make sure that the installation socket does not exceed a certain length so that the tuning fork
can project freely into the vessel.
Possibilities for optimization:
• A vertical orientation of the point level switch keeps buildup to a minimum.
• Preferably flush-mounted on vessels or in pipes.

Liquiphant FTL31 Mounting
Endress+Hauser 13
A0022057
 5 Buildup on tank wall, pipe wall and tuning fork
5.1.5 Weld-in adapter with leakage hole
If installed horizontally, make sure that the leakage hole is pointing down. This allows leaks
to be detected as quickly as possible.
5.1.6 Marking
The marking indicates the position of the tuning fork. If installed horizontally in vessels, the
marking is face up.
The marking is either a material specification (e.g. 316L) or a type of thread (e.g. G ½") and is
located:
• On the hexagonal bolt of the process adapter
• On the nameplate
• On the weld-in adapter

Mounting Liquiphant FTL31
14 Endress+Hauser
<-1.4435
G1
316L
15°
±
<-1.4435
<-1.4435
G1
316L
A0022641
 6 Orientation in the vessel
-316L
<
G 3/4
316L
-316L
<
G 3/4
316L
±15°
A0022804
 7 Orientation in the pipe
5.1.7 Installation in pipes
During installation, pay attention to the position of the fork in order to minimize turbulence in
the pipe.

Liquiphant FTL31 Mounting
Endress+Hauser 15
ø >50 (2.0)
<5 m/s (16 ft/s)
ø >10 (0.4)
G 3/4
316L
A0021357
 8 Position of the tuning fork in pipes. Unit of measurement mm (in)
5.1.8 Installation in vessels
If installed horizontally, pay attention to the position of the tuning fork to ensure that the
liquid can drip off.
The electrical connection, e.g. M12 plug, should be established with the cable pointing
downwards. This can prevent moisture from penetrating.
A0021034
 9 Position of the fork in the case of horizontal installation in a vessel
5.1.9 Distance from wall
Ensure that there is sufficient distance between the expected buildup on the tank wall and the
fork. Recommended distance from wall ≥10 mm (0.39 in).

Mounting Liquiphant FTL31
16 Endress+Hauser
A0022272
5.2 Mounting the measuring device
Use in accordance with WHG: Prior to mounting the device, pay attention to the WHG
approval documents. The documents can be found in the Download Area of the Endress
+Hauser website: www.endress.com → download
5.2.1 Required tools
• Open-ended wrench: only turn by the hex bolt when screwing in.
Maximum torque: ≤ 30 Nm (22 lbf ft).
• Socket wrench: the socket wrench AF32 is available as an accessory →  34.
Pay attention to the temperature and pressure specifications for seals used at the
customer site.
View, dimensions in mm (in) Description
1
2
L1
L2
32 mm
A0023245
1 Flat seal
2 Weld-in adapter
Thread accessory weld-in adapter
Example G ¾" (example in graphic on left)
• L1: 63.9 mm (2.52 in)
• L2: 38.0 mm (1.5 in)
G 1"
• L1: 66.4 mm (2.61 in)
• L2: 48.0 mm (1.89 in)
Pressure and temperature (maximum):
+25 bar (+362 psi) at +150 °C (+302 °F)
+40 bar (+580 psi) at +100 °C (+212 °F)
When using a weld-in adapter with flush-mounted
seal, the flat seal (1) supplied must be removed
from the thread.

Liquiphant FTL31 Mounting
Endress+Hauser 17
View, dimensions in mm (in) Description
66.4 (2.6)
47.9 (1.8)
32 mm
A0022026
Metric thread in customer nozzle
Example G 1"
Pressure and temperature (maximum):
+40 bar (+580 psi) at 150 °C (302 °F)
P
T
F
E
32 mm
A0022028
NPT thread (ANSI B 1.20.1)
Pressure and temperature (maximum):
+40 bar (+580 psi) at +150 °C (+302 °F)
Wrap in sealing material if necessary.
5.3 Post-mounting check
 Is the device undamaged (visual inspection)?
 Does the measuring device meet the measuring point specifications?
For example:
• Process temperature
• Process pressure
• Ambient temperature
• Switch point
Are the measuring point identification and labeling correct (visual inspection)?
 Is the device adequately protected from wet conditions and direct sunlight?
 Is the device properly secured?

Electrical connection Liquiphant FTL31
18 Endress+Hauser
6 Electrical connection
The device has two operating modes: maximum safety (MAX) and minimum safety (MIN). By
choosing the corresponding operating mode, the user ensures that the device also switches in
a safety-oriented manner even in an alarm condition, e.g. if the power supply line is
disconnected.
•Maximum safety (MAX)
The device keeps the electronic switch closed as long as the liquid level is below the fork.
Sample application: overfill protection
•Minimum safety (MIN)
The device keeps the electronic switch closed as long as the fork is immersed in liquid.
Sample application: Dry running protection for pumps
The electronic switch opens if the limit is reached, if a fault occurs or the power fails
(quiescent current principle).
6.1 Connecting the device
In accordance with IEC/EN61010 a suitable circuit breaker must be provided for the
device.
6.1.1 Electronic version 3-wire DC-PNP
3-wire DC-PNP is preferably used in conjunction with programmable logic controllers (PLC),
DI modules as per EN 61131-2. Positive signal at the switch output of the electronics (PNP).
Voltage source: non-hazardous contact voltage or Class 2 circuit (North America).
Connection with M12 plug
Depending on the analysis of the switch outputs, the device works in the MAX (maximum
safety) or MIN (minimum safety) mode.
A cable is optionally available
A0022901
 10 M12 plug

Liquiphant FTL31 Electrical connection
Endress+Hauser 19
Maximum safety
Terminal assignment MAX output Yellow LED (ye)
21
34
L– L+
K
0.5A
12
2
1
Wire colors for M12 plug:
• 1 = BN (brown)
• 2 = WT (white)
• 3 = BU (blue)
• 4 = BK (black)
Symbols
K
Description
Yellow LED (ye) lit
Yellow LED (ye) not lit
External load
Minimum safety
Terminal assignment MIN output Yellow LED (ye)
L– L+
21
34
K0.5A
4
11
14
Wire colors for M12 plug:
• 1 = BN (brown)
• 2 = WT (white)
• 3 = BU (blue)
• 4 = BK (black)
Symbols
K
Description
Yellow LED (ye) lit
Yellow LED (ye) not lit
External load
Function monitoring with M12 plug
Using a two-channel analysis, function monitoring of the sensor can be implemented in
addition to level monitoring, e.g. per relay switch, PLC, AS-i Bus I/O module.

Electrical connection Liquiphant FTL31
20 Endress+Hauser
When both outputs are connected, the MIN and MAX outputs assume opposite states (XOR)
when the device is operating fault-free. In the event of an alarm condition or a line break,
both outputs are de-energized.
Connection for function monitoring using XOR operation Yellow LED (ye) LED red (rd)
21
34
L– L+
K2
K1
0.5A
Sensor covered
Max output
2
1
Min output
14
Sensor not covered
Max output
12
Min output
4
11
Fault
2
1
4
11
Wire colors for M12 plug:
• 1 = BN (brown)
• 2 = WT (white)
• 3 = BU (blue)
• 4 = BK (black)
Symbols
K1/K2
Description
LED lit
LED not lit
Fault or warning
External load
Connection with valve plug
Depending on the assignment of the connector or the wiring of the cable, the device works in
either the MAX or MIN operating mode.