BA213F/24/ae/03.06
52005008
Operating Instructions
Liquiphant M FTL50, FTL51
Level Limit Switch
Operating Instructions Liquiphant M FTL50 / FTL51
2 Endress+Hauser
Table of Contents
Safety Instructions
Order Codes
Installation
Setup
Maintenance & Cleaning
Technical Data
Troubleshooting
Spare Parts
Supplemental documentation
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 3
1 Safety Instructions
Safe and secure operation of the unit can only be guaranteed if the operating instructions and all
safety notes are read, understood and followed.
1.1 Approved usage
The Liquiphant M FTL50 and FTL51 is designed for level limit detection in liquids. If used incor-
rectly, it is possible that application-related dangers may arise. The level limit switch Liquiphant M
FTL50 and 51 may be installed, connected, commissioned, operated and maintained by qualified
and authorized personnel only, under strict observance of these operating instructions, any relevant
standards, legal requirements, and, where appropriate, the certificate.
1.2 Safety pictograms and symbols
Safe and reliable operation of this unit can only be guaranteed if the safety hints and warnings in
these operating instructions are followed. The safety hints in these instructions are highlighted using
the following symbols:
" Caution!
This symbol indicates activities and actions that, if followed incorrectly, could lead to faulty opera-
tion or even damage to the unit.
! Note!
This symbol indicates activities and actions that, if followed incorrectly, could have an indirect influ-
ence on the unit operation or could lead to an unforeseen unit reaction.
0- Hazardous area, certified equipment!
If this character is shown on the unit, then it may be operated in hazardous areas.
. Non-hazardous area!
This symbol identifies the non-hazardous areas in these instructions. Units that operate in the non-
hazardous areas but that are connected to the hazardous areas must also be certified.
1.3 Handling
Hold by housing, flange or
extension tube
kA
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02ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
4 Endress+Hauser
Do not bend.
Do not shorten.
Do not lengthen
2 Order Codes
Product structure
KA
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03ae
.eps
Design Basic weight
FTL50 Compact 1.3 lb 0.6 kg
FTL51 With extension pipe 1.3 lb 0.6 kg
10 Certificates, applications
A Version for non-hazardous area
P FM IS, Class I, II, III Division 1, Group A-G
Q FM XP, Class I, II, III Division 1, Group B-G, for E5 housing Group A-G
R FM NI, Class I Division 2, Group A-D
S CSA IS, Class I, II, III Division 1, Group A-G
T CSA XP, Class I, II, III Division 1, Group A-G
U CSA General Purpose
Y Special version
ATEX and TIIS certified units available
on request
20 Process connection, material Additional weight
Note: For 1450 psi (100 bar) process pressure, please select the appropriate option under "Additional option"
Installation in welding neck accessory
GM2 ¾" NPT Thread ANSI 316L
GM5 ¾" NPT Thread ANSI Alloy C4
GN2 1" NPT Thread ANSI 316L 0.4 lb 0.2 kg
GN5 1" NPT Thread ANSI Alloy C4 0.4 lb 0.2 kg
A82 1" 150 lb RF Flange ANSI B16.5 316/316L 2.2 lb 1.0 kg
AA2 1-¼" 150 lb RF Flange ANSI B16.5 316/316L 2.6 lb 1.2 kg
AB2 1-¼" 300 lb RF Flange ANSI B16.5 316/316L (FTL 51) 4.4 lb 2.0 kg
AC2 1-½" 150 lb RF Flange ANSI B16.5 316/316L 3.3 lb 1.5 kg
AD2 1-½" 300 lb RF Flange ANSI B16.5 316/316L (FTL 51) 6.0 lb 2.7 kg
AE2 2" 150 lb RF Flange ANSI B16.5 316/316L 5.3 lb 2.4 kg
AE5 2" 150 lb RF Flange ANSI B16.5 Alloy C4 >316/316L 5.3 lb 2.4 kg
AF2 2" 300 lb RF Flange ANSI B16.5 316/316L 7.1 lb 3.2 kg
AG2 2" 600 lb RF Flange ANSI B16.5 316/316L (FTL 51) 9.3 lb 4.2 kg
AJ2 2-½" 300 lb RF Flange ANSI B16.5 316/316L (FTL 51) 10.6 lb 4.8 kg
AL2 3" 150 lb RF Flange ANSI B16.5 316/316L 10.8 lb 4.9 kg
AM2 3" 300 lb RF Flange ANSI B16.5 316/316L (FTL 51) 15 lb 6.8 kg
AN2 3" 600 lb RF Flange ANSI B16.5 316/316L (FTL 51)
AP2 4" 150 lb RF Flange ANSI B16.5 316/316L 15.4 lb 7.0 kg
AQ2 4" 300 lb RF Flange ANSI B16.5 316/316L (FTL 51) 25.4 lb 11.5 kg
AR2 4" 600 lb RF Flange ANSI B16.5 316/316L (FTL 51) 38.1 lb 17.3 kg
TC2 DN 25-38 (1 to 1-½") ISO 2852 Tri-Clamp 316L 0.2 lb 0.1 kg
TE2 DN 40-51 (2") ISO 2852 Tri-Clamp 316L 0.7 lb 0.3 kg
YY9 Special version
Other process connections available, contact Endress+Hauser
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 5
30 Length, spacer, pressure tight bushing
FTL50
AA Compact Ra <3.2 µm/80 grit
IA 66 mm / 2.6" + temperature spacer 1.3 lb 0.6 kg
QA 66 mm / 2.6" + pressure tight bushing 1.5 lb 0.7 kg
FTL51
CB ....... in (6 in to 115 in) Ra 3.2 µm 316L**
CE ....... in (6 in to 115 in) Ra 3.2 µm Alloy C4** 5 lb (2.3 kg)/100 in
DB Length II* Ra 3.2 µm 316L 0.2 lb 0.1 kg
DE Length II* Ra 3.2 µm Alloy C4 0.2 lb 0.1 kg
KB ....... in (6 in to 115 in)
+ temperature spacer
316L** 5 lb (2.3 kg)/100 in
+1.3 lb (+0.6 kg)
KE ....... in (6 in to 115 in)
+ temperature spacer
316L** 5 lb (2.3 kg)/100 in
+1.3 lb (+0.6 kg)
LB Length II*
+ temperature spacer
316L 0.2 lb+1.3 lb
0.1 kg
+0.6 kg
LE Length II*
+ temperature spacer
Alloy C4 0.2 lb+1.3 lb
0.1 kg
+0.6 kg
SB ....... in (6 in to 115 in)
+ pressure tight bushing
316L** 5 lb (2.3 kg)/100 in
+1.5 lb +0.7 kg
SE ....... in (6 in to 115 in)
+ pressure tight bushing
Alloy C4** 5 bl (2.3 kg)/100 in
+1.5 lb +0.7 kg
TB Length II*
+ pressure tight bushing
316L 0.2 lb+1.5 lb
0.1 kg
+0.7 kg
TE Length II*
+ pressure tight bushing
Alloy C4 0.2 lb+1.5 lb
0.1 kg
+0.7 kg
YY Special version
*) Replacing instruments: when vertically mounting a Liquiphant M
FTL51 with length II, the switch point is at the same height as for the
Liquiphant II FTL360, FTL365, FDL30, FDL35
**) order 3001 to 6000 mm (116 to 235 in) via yy
40 Electronic insert
1 FEL51* Contact-free two-wire, 19 to 253 V AC
2 FEL52* PNP three-wire, 10 to 55 V DC
4 FEL54 Floating change-over contacts, DPDT, 19 to 253 V AC, 19 to 55 V DC
5 FEL55 8/16 mA, 11 to 36 V DC
6 FEL56 NAMUR
7 FEL57 Two-wire PFM
8 FEL58* NAMUR with push button (disconnects wire)
9 Special version
*) Also available in compact housing
50 Housing, cable entry
C3 Compact housing 316L IP66/68 5m cable
D3 Compact housing 316L IP65 Pg11 connector
E3 Compact housing 316L NEMA4x NPT1/2" connector
N3 Compact housing 316L IP66/68 M12 connector
E4 Polyester housing Nema 4x, NPT ½"
E5 Aluminum housing Nema 4x,NPT ¾" 1.1 lb/0.5 kg
E6 316L housing Nema 4x, NPT ½" 0.2 lb/0.1 kg
E7 Aluminum housing IP66 NPT ¾",
with separate connection compartment
2.0 lb/0.9 kg
Y9 Special version
60 Additional fittings
A No additional fittings
C 3.1.B material, wetted parts 316L,
Inspection certificate to EN 10204, in accordance with Specification 52005759
N NACE 3.1.B
P 1450 psi (100 bar) process pressure (FTL51)
R 1450 psi (100 bar) process pressure, EN 10204 - 3.1 material, NACE
MR0175 (316L wetted parts) (FTL51)
Inspection certificate
S GL marine approval (FTL 51: max. length 63"/1600 mm)
Y Special version
FTL 5# - Complete product designation
Operating Instructions Liquiphant M FTL50 / FTL51
6 Endress+Hauser
3 Installation
3.1 Application
Level limit detection in
liquids
3.2 Measuring System
For direct connection
KA
143Y
10ae
.eps
"T"
…
Order code:FTL 5# - # # # # # # # # ##
FEL 5FEL 5FEL 5
124
Electronic inserts
External load
KA
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11ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 7
For connection via
switching unit
3.3 Installation
Switchpoint depends on
mounting position
! Note!
The switchpoints of the Liquiphant M are at different positions than those of the previous version
Liquiphant II.
Order code:FTL 5# - # # # # # # # # ##
FEL 5FEL 5FEL 5FEL 5
5678
Electronic insert
KA
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12
ae.e
ps
…
EX EX
I.S.
*)FTL…,SIF…, SIN…,FXN…
*) Switching unit, PLC,isolating amplifier
KA
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13ae
.eps
KA
14
3Y
15ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
8 Endress+Hauser
Mounting examples as a
function of liquid viscosity
Consider buildup.
Fork may not contact the
buildup
min. 1 inmin. 25 mm( )
min. 1.5 in(min. 40 mm)
min. 2"(min. DN 50)
* *
� = 0 - 10,000 cP
� = 0 - 2000 cP
*Deburr
KA
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16ae
.eps
**
*DistanceK
A143Y
17ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 9
In cases of dynamic forces
support
Allow clearance
KA
143
Y18ae
.eps
.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
....
....
....
....
....
....
....
....
....
..
.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
....
....
....
....
....
....
....
....
....
..
.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
....
....
....
....
....
....
....
....
....
..
.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
....
....
....
....
....
....
....
....
....
..
"T"
"T" = with temperature spacer for insulated tanks
KA
143Y
19ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
10 Endress+Hauser
Orientation of fork tines:
marking above or below
Screw Liquiphant into
process connection.
DON’T use housing to turn.
KA
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20ae
.eps,
KA
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21ae
.eps
A
4141
B
!
41
PTFE
TEFLON
¾ NPT, R ¾, G ¾ A, SW ( )1 NPT, R 1, G 1 A, SW ( )
1¼" 32 mm1 " 41 mm5 8
Above or below
G ¾ A, SW ( )G 1 A, SW ( )
1¼" 32 mm1 " 41 mm5 8
KA
143Y
22ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 11
Orientation in pipes:
marking in direction of
flow
Cable entry orientation*Torque
Ø(ø )
min. 2"min. 50 mm
Max. 16 ft/s
5 m/s(max. )
KA
143
Y23ae
.eps
12
3 to 4turns
*0.9 Nm
1 21 2
... 270°
... 300°
1. 2. 3.
F16, F13, F17
F15
KA
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24ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
12 Endress+Hauser
4 Setup
Minimum/maximum fail-
safe mode
Liquid density.
Density ρ measured in
g/cm3 (SGU) or in kg/l
0 V
Max.
Max.
Min.Min.
KA
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25ae
.eps
lbs5.9
1US gal
lbs4.2
1US gal
�
�
1 US. gal = min. 5.9 lbs(1 l (1 dm³) = min 0.7 kg)(1 imp.gal = min. 7.0 lbs)
0 V
> 0.7 ( 5.9 lbs.)�
FEL , FEL , FEL , FEL , FEL , FEL , FEL51 52 54 55 56 57 58
> 0.5
( 4.2 - 5.9 lbs.)�
1 US. gal = 4.2 - 5.9 lbs
1 l ( 1 dm³) = 0.5 - 0.7 kg(1 imp.gal = 5.0 - 0.7 lbs)( )
Standard
e.g. Propane
KA
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26ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 13
Self test FEL57 (See page 21 and
switching unit for
sequence)
4.1 Display elements
FEL 57
STD
~ 8 s
~ 41 s
EXT
+–
Switching unit
With corrosion test
Standard
KA
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27ae
.eps
KA
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38ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
14 Endress+Hauser
4.2 Connections, Function
Max. AWG 14
1/8 in3 mm( )
(Max. )2,5 mm²
Max. AWG 12
(Max. )4 mm²
FEL…
Note national regulations!
KA
14
3Y
29ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 15
Connections FEL51
Two-wire AC connection
Function FEL51
∆VFEL51 max. 3V
KA
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30ae
.eps
KA
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39ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
16 Endress+Hauser
Connections FEL52
DC connection (PNP)
Function FEL52
∆VFEL52 max. 3V
KA
143Y
31ae
.eps
KA
143
Y40ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 17
Connections FEL54
Universal connection
Relay output
Function FEL54
KA
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32ae
.eps
Max.
Min.
GN RD
3 54
3 54
6 87
6 87
3 54
3
3
3
5
5
5
4
4
4
6 87
6
6
6
8
8
8
7
7
7
FEL 54
FEL 54
1 2 6 7 83 4 5
V 0 V12
KA
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41ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
18 Endress+Hauser
Connections FEL55
Output
8/16 mA
Function FEL55
R
IS
11 - 36 VDC
R =max. 11 V16.8 mA
+–
1 2
EX
EX
FEL 55
e.g. PLC, AI modules
Hazardous Area
Non-HazardousArea
FM
KA
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33ae
.eps
Max.
Min.
GN RD FEL 55
~ 8 mA1
~ 16 mA1
~ 16 mA1
~ 8 mA1
FEL 55
1 2
< 3.6 mA1
+ 2
+ 2
+ 2
+ 2
+ 2
KA
143Y
42.e
ps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 19
Connections FEL56
NAMUR output L-H
<1.0 mA / >2.2 mA
Function FEL56
H
L
IH2.2 - 2.8 mA
0.6 - 1.0 mAL
+–
IS
1 2
EX
EX
FEL 56
e.g. FXN 421, FXN 422, SIN 100, SIN 110FTL 325N, FTL 375N
Multiplexer: pulse cycle minimum 2 sduty
HazardousArea
Non-HazardousArea
FM
Isolating amplifier toNAMUR (IEC 60947-5-6)
KA
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34ae
.eps
0.6…1.0 mA
0.6…1.0 mA
2.2…2.8 mA
2.2…2.8 mA
2.2…2.8 mA
Max.
Min.
FEL 56GN RD
FEL 56
1 2
1
1
1
1
1
+ 2
+ 2
+ 2
+ 2
+ 2
KA
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43ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
20 Endress+Hauser
Connections FEL57
PFM output
150 Hz/50 Hz
Function FEL57
IS
+–
1 2
EX
EX
7 833 3437 38
NivotesterFTL 320, FTL 120ZFTL 325 P CH1FTL 325 P CH3
FTL 370/372, FTL 170ZFTL 375 P CH1Input 1
FTL 372, FTL 170ZFTL 375 P CH2Input 2
FTL 375 P CH3Input 3
Commutec SSIF 101, SIF 111
d4 d2
z4 z2
z6 d6
2 1
FEL 57
H H 150 Hz
50 HzL L
f
Note function!
HazardousArea
Non-HazardousArea
See page 21
FM
KA
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35
ae.e
ps
0 Hz
0 Hz
150 HzI
t
I
tI
t
I
t
50 Hz
FEL 57GN YE
V 0 V12
FEL 57
*
*Switch-on behavior
See page 21
KA
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44ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 21
Switch-on behavior STD
(Self test)
Switch-on behavior EXT
(Self test)
0 Hz 50 Hz 50 Hz
0 Hz 150 Hz 50 Hz 150 Hz
1 s 7 s
1 s 4 s 3 s
FEL 57
FEL 57
FEL 57
STD
Simulation
Simulation
KA
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45ae
.eps
0 Hz 150 Hz 50 Hz 0 Hz 150 Hz
0 Hz 50 Hz 0 Hz 50 Hz
1 s 4 s 30 s 6 s
1 s 34 s 6 s
FEL 57
FEL 57
FEL 57
EXT
Simulation
Simulation
KA
14
3Y
47ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
22 Endress+Hauser
Connections FEL58
NAMUR output H-L
>2.2 mA / <1.0 mA
Function FEL58
H
L
IH2.2 - 3.5 mA
0.6 - 1.0 mAL
+–
IS
1 2
EX
EX
FEL 58
e.g. FXN 421, FXN 422, SIN 100, SIN 110FTL 325 N, FTL 375 N
Multiplexer: pulse cycle minimum 2 sduty
HazardousArea
Non-HazardousArea
FM
Isolating amplifier toNAMUR (IEC 60947-5-6)
KA
143
Y36ae
.eps
2.2…3.5 mA
2.2…3.5 mA
0.6…1.0 mA
0.6…1.0 mA
< 1.0 mA0.3 Hz
1 Hz
1 Hz
1 Hz
1 Hz
Max.
Min.
FEL 58GN YE
FEL 58
1 2
1
1
1
1
1
+ 2
+ 2
+ 2
+ 2
+ 2
KA
143
Y49ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 23
Function test button FEL58
Fail-safe mode MAX
Function test button FEL58
Fail-safe mode MIN
* T
T
Ex dEx d
MAX
GN
1 Hz
YE
0.6…1.0 mA
1+2
GN YE
0 mA1
+2
GN
1 Hz
YE
2.2…3.5 mA
1+2
GN
1 Hz
YE
0.6…1.0 mA
1+2
1. Normal operation GN YE
2.2…3.5 mA
1+2
1 Hz
2. Press test button
3. Release the test button,after ~2 s normal operation
GN YE
0 mA1
+2
>3 s
T+
KA
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64
ae.e
ps
* T
T
Ex dEx d
MIN
GN
1 Hz
YE
0.6…1.0 mA
1+2
GN YE
0 mA1
+2
GN
1 Hz
YE
2.2…3.5 mA
1+2
GN
1 Hz
YE
0.6…1.0 mA
1+2
1. Normal operation GN YE
2.2…3.5 mA
1+2
1 Hz
2. Press test button
3. Release the test button,after ~2 s normal operation
GN YE
0 mA1
+2
>3 s
T+
KA
143Y
65ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
24 Endress+Hauser
5 Maintenance & Cleaning
Removal of encrustation
KA
14
3Y
53ae
.eps
KA
143Y
54ae
.eps
Do not use as a step!
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 25
6 Technical Data
Ambient temperature Ta
Process temperature Tp
Process pressure pe
Process temperature Tp
6.1 Accessories
Weld-in sockets max. 360 psi/300°F
(max. 25 bar/150°C)
max. 580 psi/210°F
(max. 40 bar/100°C)
T
( )158 °F70 °C
32 °F
( )122 °F50 °C
T
T
T–58(–5 ) ( ) ( ) ( )
°F 32 °F 194 °F 300 °F0 °C 0 °C 90 °C 150 °C
–58 °F(–50 °C)
Available whenused with temperaturespacer.See order codes.
aa
p
P
°F
°F
KA
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55ae
.eps
pe
psi(bar)
FTL51-FTL51-
# ### ## # ### ### ## # ##
P
R
Tp
( )°F°C
92864( )
–58–50( )
300150( )
320( )
–14.5–1( )
1450( )100
See order codes
KA
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70ae
.eps
1.02 (26)
0.97(24.6)
1.02(26)
0.20 (5)
1.16 (29.6)
G ¾
E+H 52001052
G 1
E+H 52001051
G 1
E+H 52001221
Ø 2.5( 65Ø )
Ø 2.36( 60Ø )G1
ISO 228Ø1.61(ø41)
Ø 2.16(Ø55 )G ¾
ISO 228Ø1.26(ø32)
0.83(21)
Dimensions are in inches (mm)
-0.02
-0.4
-0.4
-0.3
-0.02
-0.01
KA
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56ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
26 Endress+Hauser
Lap joint flanges with BSP 1
(G1) thread; Covers with
window
Sliding sleeves for
unpressurized operation
See KA151F
(G 1, NPT 1)
See KA152F
(G 1½, NPT 1½)
Corrosion-resistant steel1.4571(AISI 316 Ti)
PA 12
AISI 316 L1.4435( )
PC
( )AISI 316 L1.4435
Glass
Lap joint flange with G1 thread2”, 150 psi, RF, ANSI B 16.5E+H 918144-0000
Transparent coverFor plastic housing
E+H 943461-0001
Stainless steel cover with glass windowFor stainless steel housing
E+H 943301-1000
With polycarbonate window
E+H 52001403
KA
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58ae
.eps
0.87(22)
0.75(19)
0.75(19)
0.71(18)
M6 (3x)
M6 (3x)
G 1E+H 52003978
G 1½E+H 52003980
p = 0 psi(p = 0 bar)
max. 300 °F(max. 150 °C)
e
e
1 - 11½ NPTE+H 52003979
1.4435(AISI 316 L)
1.4435(AISI 316 L)
1½ - 11½ NPTE+H 52003981
Ø0.86
(21.8)
Ø0.86
(21.8)
1.61
(41)
2.16
(55)
KA
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59ae
.eps
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 27
High pressure
sliding sleeves
See KA153F
(G 1, NPT 1)
See KA154F
(G 1½, NPT 1½)
High pressure
sliding sleeves:
Process pressure pe
Process temperature Tp
G 11.4435 (AISI 316 L)E+H 52003663
G 1½1.4435 (AISI 316L)E+H 52003665
1 - 11½ NPT1.4435 (AISI 316 L)E+H 52003667
1½ - 11½ NPT1.4435 (AISI 316L)E+H 52003669
0.86(22)
0.98(25)
0.98(25)
0.71(18)
Ø2.36 (60)
Ø2.36 (60)
0.08(2)
0.08(2)
Alloy C4E+H 52003664
Alloy C4E+H 52003668
Alloy C4E+H 52003666
Alloy C4E+H 52003670
~2.83(72)
~2.75(70)
KA
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60ae
.eps
Liquiphant S
Liquiphant M
1160 (80)
psi(bar)
°F (°C)-76
(-60) -58(-50)
500(260)
300(150)
540(280)
-14.5 (-1)
32(0)
1450 (100)
928 (64)
KA
143
Y69ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
28 Endress+Hauser
7 Troubleshooting
Troubleshooting
Supplement
If the switching behavior of the fork is abnormal, the fork frequency can be measured at PIN 4 of
the diagnosis socket. With electronic inserts FEL 51/52/54/55/56/57/58, this is a sinusoidal
vibration whose amplitude makes it possible to determine the condition of the fork.
Fault Reason Remedy
Does not switch No power Check power
Faulty signal line Check signal line
Faulty electronic insert
– FEL51 connected directly to L1 and N
Exchange
– always connect FEL51 via external load
Density of liquid too low Set density to >0.5 at electronic insert
Fork encrusted Clean fork
Fork corroded
(Indication on FEL: red/yellow flashes,
FEL58: green flashes (0.3 Hz)
Exchange fork and process connection
FEL51: Internal resistance of connected
relay too large
Connect suitable relay
FEL51: Holding current of connected
relay too low
Connected resistor in parallel with relay
FEL54: Contacts welded together (after
short-circuit)
Exchange FEL54; put fuse in contact circuit
Switches incorrectly Min-/Max- fail-safe mode set wrong Set correct mode at electronic insert
Sporadic faulty
switching
Thick heavy foam, very turbulent
conditions, foaming liquid
Mount Liquiphant in bypass
Extreme RFI Use shielded cable
Extreme vibration Decouple, damp, turn fork 90°
Water in housing Screw cover and cable gland tight
FEL52: Output overloaded Reduce load, (cable) capacitance
Switches incorrectly
after power failure
FEL57: behavior during switch-on test
(functional test)
Observe switching behavior of FEL57; after
power failure block plant control for up to 45 s
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 29
8 Spare Parts
Electronic inserts Installation specification:
During installation, please keep in mind that
electrical resources (electronic inserts) which
are powered by non-intrinsically-safe circuits
may no longer be interconnected with intri-
niscally-safe circuits.
Housing covers, seals
9 Repair
Repair is done at
Endress+Hauser
KA
143Y
61ae
.eps
FEL51 52002304
FEL52 52002305
FEL54 52002306
FEL55 52002307
FEL56 52002308
FEL57 52002309
FEL58 52006454
*
*
*
* KA
143Y
62ae
.eps
Lubricate with silicone grease or graphite.
Alu
EPDM
Alu w/EPDM O-ring E+H 52002699
Alu (EX) w/EPDM O-ring E+H 52002698
PBT-FR (cover only) E+H 943461-0000
EPDM O-ring E+H 017717-0003
AISI 304/316L E+H 943301-0000
(cover only)
(1.4301/1.4435)
MVQ Silicone Seal E+H 943304-0000
1.
2.
3.
Endress+Hauser
Clean
Transportprotection
KA
143Y
63ae
.eps
Operating Instructions Liquiphant M FTL50 / FTL51
30 Endress+Hauser
10 Supplemental Documentation
Technical Information
TI328F Liquiphant FTL50, FTL50H, FTL51, FTL51H
Notes on Safety
XA031F 4 0 II 1/2 G EEx d IIC/IIB
XA063F 4 0 II 1/2 G, II 1/2 D EEx ia/ib IIC/IIB
XA064F 4 0 II 1 G EEx ia IIC/IIB
XA108F 4 0 II 1/2 G EEx de IIC/IIB
XA154F 4 0 II 1/2 G, II 1/2 D EEx ia/ib IIC/IIB
XA159F 4 0 II 1 G EEx ia IIC/IIB
XA182F 4 0 II 3 G, II 3 D EEx nA/nC II
Liquiphant M FTL50 / FTL51 Operating Instructions
Endress+Hauser 31
United States Canada Mexico
Endress+Hauser, Inc.2350 Endress PlaceGreenwood, IN 46143Tel: 317-535-7138Sales: 888-ENDRESSService: 800-642-8737FAX: [email protected]
Endress+Hauser Canada1075 Sutton DriveBurlington, ON L7L 5Z8Tel: 905-681-9292800-668-3199FAX: 905-681-9444www.ca.endress.com
Endress+Hauser (Mexico) S.A. de C.V.Calle de Gustavo Baz No. 43Fraccionamiento Bosques de EchegarayCP 53310 Naucalpan de JuárezMexicoTel: +52 55 5371 1110FAX: +52 55 5371 1128
BA213F/24/ae/03.06
52005008
FM+SGML 6.0
Endress+Hauser Mexico, S.A. de C.V.Av. Gustavo Baz No. 43Fracc. Bosques de EchegarayNaucalpan de Juaraz, C.P. 53310Estada de MexicoMexicoPhone: (52)-55-5371-1110FAX: (52)-55-5371-1128E-mail: [email protected]