Endress+Hauser FTL41 Specifications

TI01402F/00/EN/02.19
71440553
2019-06-29

Products Solutions Services

Technical Information

Liquiphant FTL41

Vibronic

Limit switch for liquids

Application

• Limit switch for minimum or maximum detection in tanks, containers and piping
with all types of liquids, even in hazardous areas

• Process temperature range: –40 to +150 °C (–40 to +302 °F)

• Pressures up to 40 bar (580 psi)

• Viscosities up to 10 000 mPa⋅s

• Ideal substitute for float switches, as reliable function is not affected by flow,
turbulence, air bubbles, foam, vibration, solids content or buildup.

Advantages

• 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

Table of contents

Liquiphant FTL41

About this document ........................ 4

Symbols ................................... 4

Function and system design ................... 5

point level detection ........................... 5

Measuring principle ........................... 5

Measuring system ............................ 5

Input ..................................... 5

Measured variable ............................ 5

Measuring range ............................. 5

Output ................................... 5

Output and input variants ........................ 5

Output signal ................................ 6

Ex connection data ............................ 6

3-wire DC-PNP (electronic insert FEL42) ......... 6

Supply voltage ............................... 6

Power consumption ............................ 6

Current consumption ........................... 6

Load current ................................. 6

Residual current .............................. 6

Residual voltage .............................. 6

Behavior output signal .......................... 6

Terminal assignment ........................... 7

Behavior of the switch output and signaling ............ 7

Mounting ................................ 12

Mounting location, orientation ................... 12

Installation instructions ........................ 12

Taking marking into account ..................... 14

Weld-in adapter with leakage hole ................ 15

Sliding sleeves .............................. 15

Aligning the cable entry ........................ 15

Special mounting instructions .................... 15

Environment .............................. 16

Ambient temperature range ..................... 16

Storage temperature .......................... 16

Humidity .................................. 16

Operating altitude ............................ 16

Climate class ............................... 16

Degree of protection .......................... 16

Vibration resistance .......................... 17

Shock resistance ............................. 17

Mechanical load ............................. 17

Electromagnetic compatibility .................... 17

Process .................................. 17

Process temperature range ...................... 17

Thermal shock .............................. 17

Process pressure range ........................ 17

Test pressure ............................... 18

Density ................................... 18

Pressure tightness ........................... 18

Universal current connection with relay output

(electronic insert FEL44) ..................... 7

Supply voltage ............................... 8

Power consumption ............................ 8

Connectable load .............................. 8

Behavior output signal .......................... 8

Terminal assignment ........................... 8

Behavior of the switch output and signaling ............ 9

2-wire NAMUR > 2.2 mA/< 1.0 mA (electronic

insert FEL48) .............................. 9

Supply voltage ............................... 9

Power consumption ............................ 9

Behavior output signal .......................... 9

Terminal assignment .......................... 10

Behavior of the switch output and signaling ........... 10

Performance characteristics .................. 10

Reference operating conditions ................... 10

Maximum measured error ...................... 11

Hysteresis ................................. 11

Non-repeatability ............................ 11

Influence of the process temperature ............... 11

Influence of the process pressure .................. 11

Influence of the density of the process medium (at room

temperature and normal pressure) ................. 11

Mechanical construction .................... 18

Design, dimensions ........................... 18

Dimensions ................................ 19

Weight ................................... 25

Materials ................................. 25

Surface roughness ........................... 25

Operability ............................... 25

Operation concept ............................ 25

Elements on the electronic insert .................. 26

Terminals ................................. 26

Local operation ............................. 26

Certificates and approvals ................... 27

CE mark .................................. 27

RCM-Tick marking ............................ 27

Ex approval ................................ 27

Overfill protection ............................ 27

Marine approvals ............................ 27

CRN approval ............................... 27

Test reports ................................ 27

Pressure Equipment Directive .................... 28

Process seal as per ANSI/ISA 12.27.01 .............. 28

China RoHS symbol ........................... 28

RoHS ..................................... 28

Additional certification ......................... 28

ASME B 31.3 ............................... 28

2 Endress+Hauser

Liquiphant FTL41

Ordering information ....................... 29

TAG ..................................... 29

Accessories ............................... 29

Device-specific accessories ...................... 29

Sliding sleeves for unpressurized operation ........... 30

High pressure sliding sleeves ..................... 31

Supplementary documentation ............... 33

Special documentation ......................... 33

Device-dependent supplementary documentation ....... 33

Endress+Hauser 3

About this document

DANGER

WARNING

CAUTION

NOTICE

A

1.

-

.

Symbols Safety symbols

This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or
fatal injury.

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or
fatal injury.

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in minor or
medium injury.

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.

Liquiphant FTL41

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

 Reference to another section

, 2., 3. Series of steps

Symbols in graphics

A, B, C ...  View

1, 2, 3 ...  Item numbers

 Hazardous area

 Safe area (non-hazardous area)

4 Endress+Hauser

Liquiphant FTL41

A B

Function and system design

point level detection

Measuring principle

Measuring system

Maximum or minimum detection for liquids in tanks or pipes in all industries. Suitable for leakage
monitoring, dry-running protection, pump protection or overfill protection, 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 protection

• In MAX mode, the fork is not covered e. g. overfill protection
Demand mode

• In MIN mode, the fork is not covered e. g. pump protection

• In MAX mode, the fork is covered e. g. overfill protection

The sensor's tuning fork vibrates at its intrinsic frequency. As soon as the liquid covers the tuning
fork, the vibration resistance decreases. The change in frequency causes the point level switch to
switch.

 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

Input

Measured variable

Measuring range

Level (point level), MAX or MIN safety

Depends on the installation location and the pipe extension ordered

Output

Output and input variants Electronic inserts

3-wire DC-PNP (FEL42)

• Three-wire direct current version

• Switches the load via the transistor (PNP) and separate connection, e. g. in conjunction with
programmable logic controllers (PLC)

Universal current connection, relay output (FEL44)

Switches the loads via 2 floating change-over contacts

A0035308

Endress+Hauser 5

2-wire NAMUR > 2.2 mA/< 1.0 mA (FEL48)

• For separate switching unit

• Signal transmission H-L edge 2.2 to 3.8/0.4 to 1.0 mA as per EN 60947-5-6 (NAMUR) on two­wire cabling

Output signal Switch output

Preset switching times for the limit switches can be ordered for the following areas:

• 0.5 seconds when the tuning fork is covered and 1 second when it is uncovered (factory setting)

• 0.25 seconds when the tuning fork is covered and 0.25 seconds when it is uncovered (fastest
setting)

• 1.5 seconds when the tuning fork is covered and 1.5 seconds when it is uncovered

• 5 seconds when the tuning fork is covered and 5 seconds when it is uncovered

Liquiphant FTL41

Ex connection data

Supply voltage

Power consumption

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.

3-wire DC-PNP (electronic insert FEL42)

• Three-wire direct current version

• Switches the load via the transistor (PNP) and separate connection, e. g. in conjunction with
programmable logic controllers (PLC), DI modules as per EN 61131-2

WARNING

L

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 V

Observe the following in accordance with IEC/EN61010-1: Provide a suitable circuit breaker for
the device and limit the current to 500 mA, e. g. through the installation of a 0.5 A fuse (slow­blow) in the power supply circuit.

P < 0.5 W

DC

Current consumption

Load current

Residual current

Residual voltage

Behavior output signal

I ≤ 10 mA (without load)

The red LED flashes in the event of an overload or short-circuit. Check for an overload or short­circuit every five seconds.

I ≤ 350 mA

I < 100 µA (for blocked transistor)

U < 3 V (for switched through transistor)

• OK status: switched through

• Demand mode: blocked

• Alarm: blocked

6 Endress+Hauser

Liquiphant FTL41

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

I

L

A

L+L-

K

MAX

RD YE GN

MIN

K

K

K

(L–)

(L–)

(L–)

I

L

<100 µA

I

L

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

Terminal assignment

A0036056

 2 Terminal assignment FEL42

A Terminal assignment at electronic insert
B Terminal assignment on connector M12

Behavior of the switch output and signaling

A0033508

 3 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

Endress+Hauser 7

Universal current connection with relay output (electronic insert FEL44)

• Switches the loads via 2 floating change-over contacts

• Two separate change-over contacts (DPDT)

Liquiphant FTL41

L1

MIN

>0,7

MAX

>0,5

N

4

3 5

876

U = 19...55 V DC

U 19...253 V AC

~

~

!

0.5 A

1

2 2

L1
L+

NO NONC NCC CNL-PE

1 2 3 64 75 8

WARNING

L

In the event of an error, the electronic insert can exceed the limit temperature for touchable
surfaces, posing the risk of burns.

Do not touch the electronics in the event of an error!

‣

Supply voltage

Power consumption

Connectable load

Behavior output signal

U= 19 to 253 VAC / 19 to 55 V

DC

Observe the following in accordance with IEC/EN61010-1: Provide a suitable circuit breaker for
the device and limit the current to 500 mA, e. g. with the installation of a 0.5 A fuse (slow­blow) in the phase (not the neutral conductor) of the power supply circuit.

P < 25 VA,< 1.3 W

Loads switched via 2 floating change-over 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

Electronic insert FEL42 DC PNP preferred 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 inductivity, 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.

Both relay contacts switch simultaneously.

• OK state: Relay energized

• Demand mode: Relay de-energized

• Alarm: Relay de-energized

Terminal assignment

A0036057

 4 Universal current connection with relay output, electronic insert FEL44

1 When bridged, the relay output works with NPN logic
2 Connectable load

8 Endress+Hauser

Liquiphant FTL41

3 54

3 54

6 87

6 87

3 54

33554

4

6 87

66887

7

MAX

RD YE GN

MIN

Behavior of the switch output and signaling

A0033513

 5 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

Supply voltage

Power consumption

Behavior output signal

2-wire NAMUR > 2.2 mA/< 1.0 mA (electronic insert FEL48)

• 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

U = 8.2 V

P < 50 mW

• 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

DC

Observe the following in accordance with IEC/EN61010-1: Provide a suitable circuit breaker for
the device.

Endress+Hauser 9

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

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-

Liquiphant FTL41

A0036058

 6 2-wire NAMUR > 2.2 mA/< 1.0 mA, electronic insert FEL48

Behavior of the switch output and signaling

 7 FEL48 switching behavior and signaling

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

Reference operating conditions

Performance characteristics

• Ambient temperature: 23 °C (73 °F)

• Process temperature: 23 °C (73 °F)

• Density (water): 1 g/cm

• Medium viscosity: 1 mPa⋅s

3

• Process pressure: ambient pressure/unpressurized

• Sensor installation: vertically from above

• Density selection switch: > 0.7 g/cm3 (SGU)

• Switch direction of sensor: uncovered to covered

10 Endress+Hauser

A0037694

Liquiphant FTL41

~13 (0.5)

~4 (0.16)

~12.5 (0.49)

D

A B C

D

D

0.5

1

1.5

2

-8

-6

-4

-2

0

2

4

6

[in]

[g/cm!]

C

A ( )ρ

B1

A1

-0.3

-0.2

-0.2

-0.1

0

0.2

0.2

[mm]

0.1
B ( )ρ

[ ]ρ

Taking the switch point into consideration

Typical switch points, depending on the orientation of the point level switch

(water +23 °C (+73 °F))

A0037915

 8 Typical switch points. Unit of measurement mm (in)

A Installation from above
B Installation from below
C Installation from the side
D Switch point

Maximum measured error

Hysteresis

Non-repeatability

Influence of the process temperature

Influence of the process pressure

Influence of the density of the process medium (at room temperature and normal pressure)

At reference operating conditions: max. ±1 mm (0.04 in)

Typically 2.5 mm (0.1 in)

2 mm (0.08 in)

The switch point moves between +1.4 to –2.6 mm (+0.06 to –0.1 in) in the temperature range from
–50 to +150 °C (–58 to +302 °F)

The switch point moves between 0 to 2.6 mm (0 to 0.1 in) in the pressure range from
–1 to +64 bar (14.5 to 928 psi)

 9 Switch point deviation over density

A Density switch setting (ρ) > 0.7
A1
B Density switch setting (ρ) > 0.5
B1
C Switch point deviation

Endress+Hauser 11

reference operating condition ρ = 1 g/cm

Reference operating condition ρ = 0.7 g/cm

3

A0037669

3