Endress+Hauser Levelflex FMP51 Manual

Application
• FMP51 - premium device for level and interface
masurment in liquids.
• FMP52 - premium device with coated probe for the
use in aggressive liquids. Wetted parts FDA listed
materials.
• FMP54 - premium device for high-temperature and
high-pressure applications, mainly in liquids.
• Measuring range up to 45 m (148 ft)
• Process connection starting 3/4" thread or flange
• Temperature range:
–196 to +450 °C (–321 to +842 °F)
• Pressure range: –1 to 400 bar (–14.5 to 5 800 psi)
• The following interfaces are available for system
integration:
HART with 4...20 mA analog
• Used for level monitoring (MIN, MAX, range) up to
SIL 3 (homogeneous redundancy), independently
assessed by TÜV as per IEC 61508
Your benefits
• Reliable measuring:
– in case of moved surface and foam
– for changing medias
– in dust applications (FMP54 only)
• High availablility
• Integrated data memory
• Factory precalibrated
• Intuitive, menu-guided operating concept in national
languages
• Simple integration into control or asset management
systems
• Exact instrument and process diagnosis to assist fast
decisions
• Approvals: ATEX, IEC Ex, CSA, FM
Pressure Equipment Directive PED (FMP54 only)
Technical Information
Levelflex FMP51, FMP52, FMP54
Guided Level-Radar
Level and interface measurement in liquids
TI01001F/00/EN/10.10
71120833

Table of contents Levelflex FMP51, FMP52, FMP54
2 Endress+Hauser
Table of contents
Important document information ................ 4
Document conventions ........................... 4
Function and system design .................... 5
Measuring principle ............................. 5
Measuring system .............................. 8
Input .................................... 10
Measured variable ............................. 10
Measuring range .............................. 10
Blocking distance ............................. 11
Measuring frequency spectrum ..................... 11
Output ................................... 11
Output signal ................................ 11
Signal on alarm ............................... 12
Linearization ................................ 12
Galvanic isolation ............................. 12
Protocol-specific data ........................... 12
Auxiliary energy ........................... 13
Electrical connection ........................... 13
Supply voltage ............................... 16
Terminals .................................. 17
Cable entries ................................ 17
Cable specification ............................. 17
Device plug connectors .......................... 17
Power consumption ............................ 17
Current consumption ........................... 18
Power supply failure ............................ 18
Maximum load ............................... 18
Potential equalization ........................... 19
Overvoltage protection .......................... 19
Performance characteristics ................... 19
Reference operating conditions ..................... 19
Maximum measured error ........................ 20
Resolution .................................. 21
Reaction time ................................ 21
Influence of ambient temperature ................... 21
Influence of gas layer ........................... 21
FMP54 with gas phase compensation ................. 22
Operating conditions: Installation .............. 24
Suitable mounting position ........................ 24
Applications with restricted mounting space ............. 25
Notes on the mechanical load of the probe .............. 26
Notes on the process connection .................... 28
Securing the probe ............................. 30
Special mounting conditions ....................... 32
Operating conditions: Environment ............. 39
Ambient temperature range ....................... 39
Ambient temperature limits ....................... 39
Storage temperature ............................ 42
Climate class ................................ 42
Degree of protection ............................ 42
Vibration resistance ............................ 42
Cleaning the probe ............................ 42
Electromagnetic compatibility (EMC) ................. 42
Operating conditions: Process ................. 43
Process temperature range ........................ 43
Process pressure limits .......................... 43
Materials in contact with process .................... 44
Dielectric constant (DC) ......................... 47
Extension of the rope probes through temperature ......... 47
Mechanical construction ..................... 48
Design, dimensions ............................ 48
Tolerance of probe length ........................ 53
Weight .................................... 53
Materials ................................... 54
Human interface ........................... 56
Operating concept ............................. 56
Display elements .............................. 56
Operating elements ............................ 56
Additional functionality .......................... 56
On-site operation ............................. 56
Remote operation ............................. 57
System integration ............................. 58
Certificates and approvals .................... 60
CE mark ................................... 60
C-Tick symbol ............................... 60
Ex approval ................................. 60
Functional Safety .............................. 60
Sanitary compatibility (in preparation) ................. 60
AD2000 ................................... 60
Pressure Equipment Directive (in preparation) ............ 60
Steam boiler approval (in preparation) ................. 60
Telecommunications ........................... 60
CRN approval (in preparation) ...................... 60
Other standards and guidelines ..................... 60
Ordering information ........................ 61
Compact device Levelflex ........................ 61
Product structure FMP51, FMP52, FMP54 .............. 61
Accessories ............................... 69
Device-specific accessories ........................ 69
Communication-specific accessories .................. 73
Service-specific accessories ........................ 73
System components ............................ 74
Documentation ............................ 74
Standard documentation ......................... 74
Supplementary documentation ..................... 74
Certificates ................................. 75
Registered trademarks ....................... 75

Levelflex FMP51, FMP52, FMP54 Table of contents
Endress+Hauser 3
Patents .................................. 76

Levelflex FMP51, FMP52, FMP54
4 Endress+Hauser
Important document information
Document conventions Electrical symbols
Symbol Meaning
A0011197
Direct current
A terminal to which DC voltage is applied or through which direct current flows.
A0011198
Alternating current
A terminal to which alternating voltage (sine-wave) is applied or through which alternating current flows.
)
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.
A0011201
Equipotential connection
A connection that has to be connected to the plant grounding system: This may be a potential equalization
line or a star grounding system depending on national or company codes of practice.
Symbols and notation for certain types of information
Symbol Meaning
A0011182
Allowed
Indicates procedures, processes or actions that are allowed.
A0011183
Preferred
Indicates procedures, processes or actions that are preferred.
A0011184
Forbidden
Indicates procedures, processes or actions that are forbidden.
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.
A0011196
Reference to graphic
Refers to the corresponding graphic number and page number.
Symbols and notation in graphics
Symbol Meaning
1,2,3 ... Item numbers
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
-
A0011187
Hazardous area
Indicates a hazardous area.
.
A0011188
Safe area (non-hazardous area)
Indicates a non-hazardous location.

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 5
Function and system design
Measuring principle Level measurement
The Levelflex is a "downward-looking" measuring system that functions according to the ToF method (ToF =
Time of Flight). The distance from the reference point to the product surface is measured. High-frequency pulses
are injected to a probe and led along the probe. The pulses are reflected by the product surface, received by
the electronic evaluation unit and converted into level information. This method is also known as TDR (Time
Domain Reflectometry).
F
L
DE
100%
0%
LN
R
A0011360
LN = probe length R = reference point of measurement
D = distace E = empty calibration (= zero)
L = level F = full calibration (= span)
Dielectric constant
The dielectric constant (DC) of the medium has a direct impact on the degree of reflection of the highfrequency
pulses. In the case of large DC values, such as for water or ammonia, there is strong pulse reflection while,
with low DC values, such as for hydrocarbons, weak pulse reflection is experienced.
Input
The reflected pulses are transmitted from the probe to the electronics. There, a microprocessor analyzes the
signals and identifies the level echo which was generated by the reflection of the high-frequency pulses at the
product surface. This clear signal detection system benefits from over 30 years' experience with pulse time-of-
flight procedures that have been integrated into the development of the PulseMaster® software.
The distance D to the product surface is proportional to the time of flight t of the impulse:
D = c · t/2,
where c is the speed of light.
Based on the known empty distance E, the level L is calculated:
L = E – D
The reference point R of the measurement is located at the process connection. For details see the dimensional
drawing:
•FMP51: (® ä 49)(® ä 50)
•FMP52: (® ä 51)
•FMP54: (® ä 52)
The Levelflex possesses functions for interference echo suppression that can be activated by the user. They
guarantee that interference echoes from e.g. internals and struts are not interpreted as level echoes.

Levelflex FMP51, FMP52, FMP54
6 Endress+Hauser
Output
The Levelflex is preset at the factory to the probe length ordered so that in most cases only the application
parameters that automatically adapt the device to the measuring conditions need to be entered. For models
with a current output, the factory adjustment for zero point E and span F is 4 mA and 20 mA, for digital outputs
and the display module 0 % and 100 %. A linearization function with max. 32 points, which is based on a table
entered manually or semi-automatically, can be activated on site or via remote operation. This function allows
the level to be converted into units of volume or mass, for example.
Interface measurement
When the high-frequency pulses hit the surface of the medium, only a percentage of the transmission pulse is
reflected. In the case of media with a low DC1, in particular, the other part penetrates the medium. The pulse
is reflected once more at the interface point to a second medium with a higher DC2. The distance to the interface
layer now can also be determined taking into account the delayed time-of-flight of the pulse through the upper
medium.
DK1
c = c = 300 000 km/s
0
C =
1
DK (DC )
2 2
DK DC
1 1
( )
C0
LL
R
LI
A0011178
LL = level complete
LI = level interface
R = reference point of measurement
In addition, the following general conditions must be observed for interface measurement:
• The DC of the upper medium must be known and constant. The DC can be determined with the aid of the
DC manual SD106F. In addition, whenever the interface thickness is existing and known, the DC can be
calculated automatically via FieldCare.
• The DC of the upper medium may not be greater than 10.
• The DC difference between the upper medium and lower medium must be >10.
• The interface must have a minimum thickness of 60 mm.
•Conductivity of the upper medium: < 1 mS/cm
•Conductivity of the lower medium: > 100 mS/cm

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 7
Life cycle of the product
Engineering Procurement Installation Commissioning Operation Maintenance Retirement
A0013773-EN
å 1 Life cycle process
Engineering
• Universal measuring principle
• Measurement unaffected by medium properties
• Hardware and software developed according to SIL IEC 61508
• Genuine, direct interface measurement
Procurement
• Endress+Hauser being the world market leader in level measurement guarantees asset protection
• Worldwide support and service
Installation
• Special tools are not required
• Reverse polarity protection
• Modern, detachable terminals
• Main electronics protected by a separate connection compartment
Commissioning
• Fast, menu-guided commissioning in only 6 steps
• Plain text display in national languages reduces the risk of error or confusion
• Direct local access of all parameters
• Short instruction manual at the device
Operation
• Multi-echo tracking: Reliable measurement through self-learning echo-search algorithms taking into account
the short-term and long-term history in order to check the found echoes for plausibility and to suppress
interference echoes.
• Diagnostics in accordance with NAMUR NE107
Maintenance
• HistoROM: Data backup for instrument settings and measured values
• Exact instrument and process diagnosis to assist fast decisions with clear details concerning remedies
• Intuitive, menu-guided operating concept in national languages saves costs for training, maintenance and
operation
• Cover of the electronics compartment can be opened in hazardous areas
Retirement
• Order code translation for subsequent models
• RoHS-conforming (Restriction of certain Hazardous Substances), unleaded soldering of electronic
components
• Environmentally sound recycling concept

Levelflex FMP51, FMP52, FMP54
8 Endress+Hauser
Measuring system General notes on probe selection
• Normally use rod or coax probes for liquids. Rope probes are used in liquids for measuring ranges >
10 m (33 ft) ( > 4 m (13 ft) for FMP52) and with restricted ceiling clearance which does not allow the
installation of rigid probes.
• For interface measurement, ideally coax probes or rod probes in a bypass/stilling well are used.
• Coax probes are suited to liquids with viscosities of up to approx. 500 cst. Coax probes can measure most
liquefied gases, as of a dielectric constant of 1.4. Moreover, installation conditions, such as nozzles, tank
internal fittings etc., have no effect on the measurement when a coax probe is used. A coax probe offers
maximum EMC safety when used in plastic tanks.
Probe selection
The various types of probe in combination with the process connections are suitable for the following
applications:
Levelflex FMP51
Type of probe Rod probe Rope probe Coax probe 1)
A0011387
A0011388
A0011359
Feature 060 - Probe: Option: Option: Option:
AA 8 mm (316L) LA 4 mm (316) UA ... mm (316L)
AB 1/3" (316L) LB 1/6" (316) UB ... inch (316L)
AC 12 mm (316L) MB 4 mm (316) with
center rod
UC ... mm (AlloyC)
AD 1/2" (316L) MD 1/6" (316) with center
rod
UD ... inch (AlloyC)
AL 12 mm (AlloyC)
AM 1/2" (AlloyC)
BA
BC
16 mm (316L)
divisible
BB
BD
0.63 in (316L)
divisible
Max. probe length 10 m (33 ft) 45 m (148 ft) 6 m (20 ft)
For application level and interface
measurement in liquids
level and interface
measurement in liquids
level and interface
measurement in liquids
1) Multiple punched: optional; standard for interface measurement

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 9
Levelflex FMP52
Type of probe Rod probe Rope probe
A0011357
A0011358
Feature 060 - Probe: Option: Option:
CA 16 mm (PFA>316L) OA 4 mm (PFA>316), max. 150 mm nozzle height,
center rod
CB 0.63 in (PFA>316L) OB 4 mm (PFA>316), max. 300 mm nozzle height,
center rod
OC 1/6" (PFA>316), max. 6 in nozzle height,
center rod
OD 1/6" (PFA>316), max. 12 in nozzle height,
center rod
Max. probe length 4 m (13 ft) 45 m (148 ft)
For application level and interface
measurement in corrosive
liquids
level and interface measurement in corrosive liquids
Levelflex FMP54
Type of probe Rod probe Rope probe Coax probe 1)
A0011357
A0011358
A0011359
Feature 060 - Probe: Option: Option: Option:
AE
BA
BC
16 mm (316L) LA 4 mm (316) UA ... mm (316L)
AF
BB
BD
0.63 in (318L) LB 1/6" (316) UB ... inch (316L)
Max. probe length 10 m (33 ft) 45 m (148 ft) 6 m (20 ft)
For application level and interface
measurement in liquids
level and interface
measurement in liquids
level and interface
measurement in liquids
1) Multiple punched: optional; standard for interface measurement

Levelflex FMP51, FMP52, FMP54
10 Endress+Hauser
Input
Measured variable The measured variable is the distance between the reference point and the product surface.
Subject to the empty distance entered "E" the level is calculated.
Alternatively, the level can be converted into other variables (volume, mass) by means of linearization (32
points).
Measuring range The following table describes the media groups and the possible measuring range as a function of the media
group.
Levelflex FMP51, FMP54
Media group DC (er)Typical liquids
Measuring range 1)
bare metallic
rod probes 2)
bare metallic
rope probes
coax probes
1 1.4...1.6 condensed gases, e.g. N2, CO2on request 6 m (20 ft)
2 1.6...1.9 • liquefied gas, e.g. propane
• solvent
• Freon
• palm oil
4/10 m (13/33 ft) 15 to 22 m (49 to 72 ft) 6 m (20 ft)
3 1.9...2.5 mineral oils, fuels 4/10 m (13/33 ft) 22 to 32 m (72 to 105 ft) 6 m (20 ft)
4 2.5...4 • benzene, styrene, toluene
• furan
• naphthalene
4/10 m (13/33 ft) 32 to 42 m (105 to 138 ft) 6 m (20 ft)
5 4...7 • chlorobenzene, chloroform
• cellulose spray
• isocyanate, aniline
4/10 m (13/33 ft) 42 to 45 m (138 to 148 ft) 6 m (20 ft)
6 > 7 • aqueous solutions
• alcohols
• ammonia
4/10 m (13/33 ft) 45 m (148 ft) 6 m (20 ft)
1) The measuring range for interface measurement is limited to 10 m (33 ft). Larger measuring range available on request.
2) one-piece up to 4 m (13 ft), divisible up to 10 m (33 ft)
Levelflex FMP52
Media group DC (er)Typical liquids
Measuring range 1)
PFA-coated
rod probes
PFA-coated
rope probes
1 1.4...1.6 condensed gases, e.g. N2, CO2— —
2 1.6...1.9 • liquefied gas, e.g. propane
• solvent
• Freon
• palm oil
4 m (13 ft) 9 to 14 m (30 to 46 ft)
3 1.9...2.5 mineral oils, fuels 4 m (13 ft) 14 to 21 m (46 to 69 ft)
4 2.5...4 • benzene, styrene, toluene
• furan
• naphthalene
4 m (13 ft) 21 to 28 m (69 to 92 ft)
5 4...7 • chlorobenzene, chloroform
• cellulose spray
• isocyanate, aniline
4 m (13 ft) 28 to 32 m (92 to 105 ft)
6 > 7 • aqueous solutions
• alcohols
• acids, alkalis
4 m (13 ft) 32 to 45 m (105 to 148 ft)
1) The measuring range for interface measurement is limited to 10 m (33 ft). Larger measuring range available on request.

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 11
• Reduction of the max. possible measuring range through buildup, above all of moist products.
• Due to the high diffusion rate of ammonia it is recommended with gas-tight bushing 1) for measurements
in this medium.
Blocking distance The upper blocking distance (= UB) is the minimum distance from the reference point of the measurement
(mounting flange) to the maximum level.
F
UB
E
100%
0%
LN
R
SD
A0011279
R = reference point of measurement E = empty calibration (= zero)
LN = probe length F = full calibration (= span)
UB = upper blocking distance SD = safety distance
Blocking distance (factory setting):
• with coax probes: 0 mm (0 in)
• with rod and rope probes up to 8 m (26 ft): 200 mm (8 in)
• with rod and rope probes exceeding a length of 8 m (26 ft): 0.025 * (length of probe)
The specified blocking distances are preset on delivery. Depending on the application these settings can
be changed.
For rod and rope probes and for media with DC > 7 (or generally for stilling well/bypass applications) the
blocking distance may be reduced to 100 mm (4").
Within the blocking distance, a reliable measurement can not be guaranteed.
A safety distance SD can be defined below the blocking distance. A warning is generated if the level rises
into this blocking distance.
Measuring frequency
spectrum
100 MHz to 1.5 GHz
Output
Output signal HART
Signal coding FSK ±0.5 mA over currency signal
Data transmission rate 1200 Baud
Galvanic isolation Yes
1) for FMP54 always contain, for FMP51/52 optionally available

Levelflex FMP51, FMP52, FMP54
12 Endress+Hauser
Signal on alarm Maintenance information can be viewed via the following interfaces:
• Local display:
– Error symbol (in accordance with NAMUR Recommendation NE 107)
– Plain text display
• Current output: failsafe mode selectable (in accordance with NAMUR Recommendation NE 43):
– Minimum alarm: 3.6 mA
– Maximum alarm (= factory setting): 22 mA
• Digital interface such as HART communication or CDI service interface (in accordance with NAMUR
Recommendation NE 107)
Linearization The linearization function of the device allows the conversion of the measured value into any unit of length or
volume. Linearization tables for calculating the volume in cylindrical tanks are pre-programmed. Other tables
of up to 32 value pairs can be entered manually or semi-automatically.
Galvanic isolation All circuits for the outputs are galvanically isolated from each other.
Protocol-specific data HART
Manufacturer ID 17 (0x11)
Device type ID 0x34
HART specification 6.0
Device description files (DTM,
DD)
Information and files under:
•www.endress.com
•www.hartcomm.org
HART load Min. 250 W
HART device variables The measured values can be freely assigned to the device variables.
Measured values for PV (primary variable)
• Level linearized
• Distance
• Interface 1)
• Interface distance
• Upper interface thickness
• Electronic temperature
• Relative echo amplitude
Measured values for SV, TV, FV (second, third and fourth variable)
• Level linearized
• Distance
• Interface linearized
• Interface distance
• Upper interface thickness
• Terminal voltage
• Electronic temperature
• Absolute echo amplitude
• Relative echo amplitude
• Absolute interface amplitude
• Relative interface amplitude
• Calculated DC
Supported functions • Burst mode
• Additional transmitter status
1) only if an interface measurement is active

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 13
Auxiliary energy
Electrical connection 2-wire, 4-20mA HART (FMP5x - **A...)
Without intgrated overvoltage protection
+
1
–
2
+
–
236
4...20 mA
6
+
–
4
7
8
15
A0011294
1Terminal 4...20mA HART passive
2Active barrier with power supply (e.g. RN221N): Observe terminal voltage (® ä 16)
3HART communication resistor (³250 W): Observe maximum load (® ä 18)
4 Connection for Field Communicator 375/475 or Commubox FXA195
5Analog display device: Observe maximum load (® ä 18)
6Observe cable specification (® ä 17)
7 Potential equalization
8 Cable entry

Levelflex FMP51, FMP52, FMP54
14 Endress+Hauser
2-wire, 4-20 mA HART, 4...20mA
Without integrated overvoltage protection
–
4
+
1
–
2
+
3
+
–
2
3
10
6
4
8
5
4...20 mA
+
–
+
–
4...20 mA
+
–
1
77 9
11
12
A0013923
1Cable entry for current output 1
2 Terminal for current output 1
3Supply voltage for current output 1 (e.g. RN221N); Observe terminal voltage (® ä 17)
4HART communication resistor (³ 250 W): Observe maximum load (® ä 18)
5 Connection for Field Communicator 375/475 or Commubox FXA195
6Analog display device ; observe maximum load (® ä 18)
7Observe cable specification (® ä 17)
8 Cable entry for current output 2
9 Terminal for current output 2
10 Supply voltage for current output 2 (e.g. RN221N); Obesrve terminal voltage (® ä 17)
11 Analog display device ; observe maximum load
12 Terminal for the potential equalization line
This version is also suited for single-channel operation. In this case, current output 1 (terminals 1 and 2)
must be used.

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 15
4-wire, 4-20 mA HART (FMP5x - **K/L...)
Without integrated overvoltage protection
+
–
34
4...20 mA
³ W250
5
6
7
AC / DC
2
9
11
8
1
5
10
L+
1
L-
2
–
4
+
3
(L) (N)
A0011340
1Terminal 4...20mA HART
2 Evaluation unit, e.g. PLC
3HART communication resistor (³250 W): Observe maximum load (® ä 18)
4Analog display device: Observe maximum load (® ä 18)
5Observe cable specification (® ä 17)
6 Connection Field Communicator 375/475 or Commubox FXA195
7Supply voltage: Observe terminal voltage (® ä 17)
8 Terminal supply voltage
9 Potential equalization or protective earth
10 Cable entry for power supply
11 Cable entry for signal line
Connect equipotential bonding or protective earth (5) to the internal or external (9) transmitter ground
terminal before connecting up the device.
In order to ensure electromagnetic compatibility (EMC): Do not ground the device via the protective earth
conductor of the supply cable. Instead, ground the device via the process connection (flange or threaded
connection) or the external ground terminal.
When using the public supply mains, an easily accessible power switch must be installed in the proximity
of the device. The power switch must be marked as a disconnector for the device (IEC/EN61010).

Levelflex FMP51, FMP52, FMP54
16 Endress+Hauser
Connection HART loop converter HMX50
The dynamic variables of the HART protocol can be converted into individual 4 to 20 mA sections using the
HART loop converter HMX50. The variables are assigned to the current output and the measuring ranges of
the individual parameters are defined in the HMX50.
Stromausgang 1
Relais 1
Stromausgang 2
Stromausgang 3
Relais 2
versorgung
Eingang
1
2
3
4
5
6
7
8
9
11
12
13
14
15
19
20
21
16
17
18
22 23 24
24V DC
10 HART Loop Converter HMX50
Levelflex M
HART
Commubox
FXA191/195
+
-
+
Current output 1
Relay 1
Current output 2
Current output 3
Relay 2
Power
supply
Input
Power
HART
A0011356-DE-EN
å 2 Connection diagram for HART loop converter HMX50 (example: passive 2-wire device and current outputs
connected as power source)
The HART loop converter HMX50 can be acquired using the order number 71063562.
Additional documentation: TI429F and BA371F.
Supply voltage An external power supply is required.
Various supply units can be ordered from Endress+Hauser: see "Accessories" section (® ä 74)
2-wire, 4-20mA HART, passive
"Power Supply, Output" 1) Outputs Terminal voltage "Approval" 2)
A: 2-wire; 4-20mA HART 1 11.5 to 35 V 3) Non-Ex, Ex nA, CSA GP
11.5 to 32 V 3) Ex ic
11.5 to 30 V 3) Ex ia / IS
13.5 to 30 V 4) Ex d / XP, Ex ic(ia), Ex tD / DIP
C: 2-wire; 4-20mA HART, 4-20mA 1 13.5 to 30 V 4) all
2 12 to 30 V all
1) Feature 020 of the product structure
2) Feature 010 of the product structure
3) For ambient temperatures Ta £ -30 °C (-22 °F) a minimum voltage of 14 V is required for the satrtup of the device
at the MIN error current (3.6 mA). The startup current can be parametrized. If the device is operated with a fixed
current I ³ 4.5 mA (HART multidrop mode), a voltage of 10,4 V is sufficient throughout the entire range of ambient
temperatures.
4) For ambient temperatures Ta £ -30 °C (-22 °F) a minimum voltage of 16 V is required for the startup of the device
at the MIN error current (3.6 mA).

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 17
Load (® ä 18)
Residual ripple:
• < 1 VSS (0 to 100 Hz)
• < 10 mVSS (100 to 10 000 Hz)
4-wire, 4-20mA HART, active
"Power supply; Output" 1) Terminal voltage
K: 4-wire 90-253VAC; 4-20mA HART 90 to 253 VAC (50 to 60 Hz)
L: 4-wire 10,4-48VDC; 4-20mA HART 10.4 to 48 VDC
1) Feature 020 of the product structure
Terminals Plug-in spring terminals for wire cross-sections 0.5 to 2.5 mm2 (20 to 14 AWG)
Cable entries • Cable gland (not for Ex d):
–Plastics M20x1.5 with cable Æ 5 to 10 mm (0.2 to 0.39 in): non-Ex, ATEX/IECEx/NEPSI Ex ia/ic
–Metal M20x1.5 with cable Æ 7 to 10 mm (0.28 to 0.39 in): dust-Ex, FM IS, CSA IS, CSA GP, Ex nA
• Thread for cable entry:
– ½" NPT
– G ½"
– M20 × 1.5
• Connector (only for non-Ex, Ex ic, Ex ia): M12 or 7/8"
Cable specification HART
•For ambient temperature TU³60 °C (140 °F): use cable for temperature TU +20 K.
• A normal device cable suffices if only the analog signal is used.
• A shielded cable is recommended if using the HART protocol. Observe grounding concept of the plant.
Device plug connectors For the versions with fieldbus plug connector (M12 or 7/8"), the signal line can be connected without
opening the housing.
Pin assignment of the M12 plug connector
21
3
4
+
–
nc
A0011175
Pin Meaning
1 Signal +
2 not connected
3 Signal -
4 Ground
Pin assignment of the 7/8" plug connector
2
13
4
+
–nc
A0011176
Pin Meaning
1 Signal -
2 Signal +
3 not connected
4 Ground
Power consumption "Power supply; Output" 1) Power consumption
A: 2-wire; 4-20mA HART 0.9 W
C: 2-wire; 4-20mA HART, 4-20mA 2 x 0.7 W

Levelflex FMP51, FMP52, FMP54
18 Endress+Hauser
"Power supply; Output" 1) Power consumption
K: 4-wire 90-253VAC; 4-20mA HART 1.5 W (6 VA)
L: 4-wire 10,4-48VDC; 4-20mA HART 1.3 W
1) Feature 020 of the product structure
Current consumption HART
Nominal current 3.6 to 22 mA, the start-up current for multidrop mode can be parametrized (is set to
3.6 mA on delivery)
Breakdown signal (NAMUR
NE43)
adjustable: 3.59 to 22.5 mA
Power supply failure • Configuration is retained in the HistoROM (EEPROM).
• Error messages (incl. value of operated hours counter) are stored.
Maximum load In order to ensure a suffiecient terminal voltage at the device, the load resistance R (including wire resistance)
must not exceed a value depending on the voltage U0 supplied by the supply unit.
R[ ]W
[V]U0
10
11.5 22.5
20 30 35
0
500
A0014076
Feature 20 "Power Supply, Output", Option A "2-wire; 4-20mA HART"
Outputs Terminal voltage Feature 010 - Approval
1 11.5 to 35 V Non-Ex, Ex nA, CSA GP
11.5 to 32 V Ex ic
11.5 to 30 V Ex ia / IS
R[ ]W
[V]U0
10
13.5 24.5
20 30
0
500
A0014077
Feature 20 "Power Supply, Output", Option A "2-wire; 4-20mA HART"
Outputs Terminal voltage Feature 010 - Approval
1 13.5 to 30 V Ex d / XP, Ex ic(ia), Ex tD / DIP
Feature 20 "Power Supply, Output", Option C "2-wire; 4-20mA HART, 4-20mA"
Outputs Terminal voltage Feature 010 "Approval"

Levelflex FMP51, FMP52, FMP54
Endress+Hauser 19
1 13.5 to 30 V all
R[ ]W
[V]U0
10
12 23
20 30
0
500
A0014078
Feature 20 "Power Supply, Output", Option C "2-wire; 4-20mA HART, 4-20mA"
Outputs Terminal voltage Feature 010 "Approval"
2 12 to 30 V all
For 4-wire devices (feature 020, options "K" and "L") the admissible load is 0 to 500 W.
Potential equalization No special measures for potential equalization are required.
If the device is designed for hazardous areas, observe the information in the documentation "Safety
Instructions" (XA, ZD).
Overvoltage protection If the measuring device is used for level measurement in flammable liquids which requires the use of overvoltage
protection according to DIN EN 60079-14, standard for test procedures 60060-1 (10 kA, pulse 8/20 ms),
overvoltage protection has to be ensured by one of the following measures:
• Integrated overvoltage protection (in preparation);
Product structure: Feature 610 "Accessory mounted", option NA "Overvoltage protection".
• External overvoltage protection, e.g. Endress+Hauser's HAW562Z.
When using the external overvoltage protection HAW562Z in explosion hazardous areas observe the
associated Safety Instructions XA015R.
Performance characteristics
Reference operating
conditions
• Temperature = +24 °C (+75 °F) ±5 °C (±9 °F)
• Pressure = 960 mbar abs. (14 psia) ±100 mbar (±1.45 psi)
• Humidity = 60 % ±15 %
• Reflection factor ≥ 0,8 (surface of the water for coax probe, metal plate for rod and rope probe with min.
1 mm (0.04 in) diameter)
•Flange for rod or rope probe ³ 300 mm (12 in) diameter
•Distance to obstacles ³ 1 m (40 in)
• For interface measurement:
– Coax probe
– DC of the lower medium = 80 (water)
– DC of the upper medium = 2 (oil)

Levelflex FMP51, FMP52, FMP54
20 Endress+Hauser
Maximum measured error Typical data under reference operating conditions: DIN EN 61298-2, percentage values in relation to the span.
Output: digital analog 1)
Sum of non-linearity,
nonrepeatability and hysteresis
Level measurement:
•Measuring range up to 15 m (49 ft): ±2 mm (0.08 in)
•Measuring range >15 m (49 ft): ±10 mm (0.39 in)
•FMP54 with coax probe: ±5 mm (0.2 in)
±0.02 %
Interface measurement:
•Measuring range up to 500 mm (19.7 in): ±20 mm (0.79 in)
•Measuring range >500 mm (19.7 in): ±10 mm (0.39 in)
•If the thickness of the interface is <100 mm (3.94 in):
±40 mm (1.57 in)
Offset / Zero ±4 mm (0.16 in) ±0.03 %
1) Add error of the analogous value to the digital value.
If the reference conditions are not met, the offset/zero point arising from the mounting situation may be up to
±12 mm (0.47 in) for rope and rod probes. This additional offset/zero point can be compensated for by entering
a correction (parameter "level correction") during commissioning.
Differing from this, the following measuring error is present in the vicinity of the lower probe end:
rod probe and coax probe
-80
-60
-40
-20
0
20
40
60
80
0 50 100 150 200 250 300
distance from probe end [mm]
sum of non-linearity, non-repeatability
and hysteresis [mm]
DC = 2
DC > 7
rope probe
-80
-60
-40
-20
0
20
40
60
80
0 50 100 150 200 250 300
distance from probe end [mm]
sum of non-linearity, non-repeatability
and hysteresis [mm]
DC > 7
A0014154-EN
If for rope probes the DC value is less than 7, then measurement is not possible in the area of the straining
weight (0 to 250 mm from end of probe; lower blocking distance).