Endress+Hauser Levelflex FMP51 Technical specifications

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Brief Operating Instructions
Levelflex FMP51
Modbus
Guided wave radar
These Instructions are Brief Operating Instructions; they are
not a substitute for the Operating Instructions pertaining to
the device.
Detailed information about the device can be found in the
Operating Instructions and the other documentation:
Available for all device versions via:
• Internet: www.endress.com/deviceviewer
• Smart phone/tablet: Endress+Hauser Operations App
KA01421F/00/EN/02.22-00
71565975
2022-04-05

Associated documentation Levelflex FMP51 Modbus
2 Endress+Hauser
1 Associated documentation
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0023555
2 About this document
2.1 Symbols
2.1.1 Safety symbols
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.

Levelflex FMP51 Modbus About this document
Endress+Hauser 3
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in
personal injury.
2.1.2 Electrical symbols
Protective earth (PE)
Ground terminals that must be connected to ground prior to establishing any other
connections.
The ground terminals are located on the inside and outside of the device.
• Inner ground terminal; protective earth is connected to the mains supply.
• Outer ground terminal; device is connected to the plant grounding system.
2.1.3 Tool symbols
Flat-blade screwdriver
Allen key
Torx screwdriver
Open-ended wrench
2.1.4 Symbols for certain types of information and graphics
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 graphic
Notice or individual step to be observed

Basic safety instructions Levelflex FMP51 Modbus
4 Endress+Hauser
1.
,
2.
,
3.
Series of steps
Result of a step
Visual inspection
1, 2, 3, ...
Item numbers
A, B, C, ...
Views
2.1.5 Symbols on the device
Safety instructions
Observe the safety instructions contained in the associated Operating Instructions
Temperature resistance of the connection cables
Specifies the minimum value of the temperature resistance of the connection cables
3 Basic safety instructions
3.1 Requirements for personnel
The personnel must fulfill the following requirements for its tasks:
‣Trained, qualified specialists must have a relevant qualification for the specific function
and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣Must have read and understood the instructions in the manual and supplementary
documentation
‣Follow instructions and comply with conditions
3.2 Intended use
Application and media
The measuring device described in this manual is intended only for the level and interface
measurement of liquids. Depending on the version ordered, the measuring device can also
measure potentially explosive, flammable, poisonous and oxidizing media.
If the limit values specified in the "Technical data" and the conditions listed in the manual and
additional documentation are observed, the measuring device may be used for the following
measurements only:
‣Measured process variables: level and/or interface height
‣Calculable process variables: volume or mass in any shape of vessel (calculated from the
level by the linearization functionality)

Levelflex FMP51 Modbus Basic safety instructions
Endress+Hauser 5
To ensure that the measuring device remains in proper condition for the operation time:
‣Use the measuring device only for media to which the process-wetted materials have an
adequate level of resistance.
‣Observe the limit values in the "Technical data".
Incorrect use
The manufacturer is not liable for damage caused by improper or non-intended use.
Verification for borderline cases:
‣For special fluids and fluids for cleaning, Endress+Hauser is glad to provide assistance in
verifying the corrosion resistance of fluid-wetted materials, but does not accept any
warranty or liability.
Residual risks
Due to heat transfer from the process as well as power loss in the electronics, the temperature
of the electronics housing and the assemblies contained therein (e.g. display module, main
electronics module and I/O electronics module) may rise up to 80 °C (176 °F). When in
operation, the sensor may reach a temperature close to the medium temperature.
Danger of burns from contact with surfaces!
‣In the event of high medium temperatures, ensure protection against contact to prevent
burns.
3.3 Workplace safety
When working on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
With divisible probe rods, medium may penetrate the joints between the individual parts of
the rod. This medium may escape when the joints are loosened. This can cause injuries in the
case of dangerous (e.g., aggressive or toxic) media.
‣When loosening the joints between the individual parts of the probe rod, wear appropriate
protective equipment according to the medium.
3.4 Operational safety
Risk of injury!
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for the interference-free operation of the device.
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers:
‣If modifications are nevertheless required, consult with the manufacturer.
Repair
To ensure continued operational safety and reliability:
‣Carry out repairs on the device only if they are expressly permitted.
‣Observe federal/national regulations pertaining to the repair of an electrical device.

Incoming acceptance and product identification Levelflex FMP51 Modbus
6 Endress+Hauser
‣Use only original spare parts and accessories from the manufacturer.
Hazardous area
To eliminate danger to persons or the installation when the device is used in the hazardous
area (e.g. explosion protection, pressure vessel safety):
‣Check the nameplate to verify whether the ordered device can be put to its intended use in
the hazardous area.
‣Observe the specifications in the separate supplementary documentation, which is an
integral part of this manual.
3.5 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.
NOTICE
Loss of degree of protection by opening of the device in humid environments
‣If the device is opened in a humid environment, the degree of protection indicated on the
nameplate is no longer valid. This may also impair the safe operation of the device.
3.5.1 CE mark
The measuring system meets the legal requirements of the applicable EU directives. These are
listed in the corresponding EU Declaration of Conformity together with the standards applied.
The manufacturer confirms successful testing of the device by affixing to it the CE mark.
3.5.2 EAC conformity
The measuring system meets the legal requirements of the applicable EAC guidelines. These
are listed in the corresponding EAC Declaration of Conformity along with the standards
applied.
The manufacturer confirms successful testing of the device by affixing to it the EAC mark.
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 your Endress+Hauser sales office.

Levelflex FMP51 Modbus Incoming acceptance and product identification
Endress+Hauser 7
4.2 Product identification
The device can be identified in the following ways:
• Nameplate specifications
• Extended order code with breakdown of the device features on the delivery note
‣Enter serial number from nameplates in W@M Device Viewer
(www.endress.com/deviceviewer)
 All of the information on the measuring device and on the scope of the technical
documentation pertaining to the device is displayed.
‣Enter the serial number from the nameplate in the Endress+Hauser Operations app or scan
the 2-D matrix code on the nameplate with the camera
 All of the information on the measuring device and on the scope of the technical
documentation pertaining to the device is displayed.
4.3 Storage and transport
4.3.1 Storage temperature
• Permitted storage temperature: –40 to +80 °C (–40 to +176 °F)
• Use original packaging.
• Option for FMP51 and FMP54: –50 to +80 °C (–58 to +176 °F)
This range applies if the option JN "Transmitter ambient temperature" –50 °C (–58 °F) was
selected in order code 580 "Test, Certificate". If the temperature is permanently below
–40 °C (–40 °F), higher failure rates can be expected.
4.3.2 Transporting the product to the measuring point
LWARNING
Housing or rod may become damaged or pull off.
Risk of injury!
‣Transport the measuring device to the measuring point in its original packaging or by the
process connection.
‣Always secure lifting equipment (slings, eyes, etc.) at the process connection and never lift
the device by the electronic housing or probe. Pay attention to the center of gravity of the
device so that it does not tilt or slip unintentionally.
‣Follow the safety instructions and transport conditions for devices weighing more than 18
kg (39.6 lbs) (IEC 61010).

Incoming acceptance and product identification Levelflex FMP51 Modbus
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A0013920

Levelflex FMP51 Modbus Mounting
Endress+Hauser 9
5 Mounting
5.1 Mounting requirements
5.1.1 Suitable mounting position
A
C
12 3
4
B
A0012606
 1 Installation conditions for Levelflex

Mounting Levelflex FMP51 Modbus
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Spacing requirements when mounting
• Distance (A) between the vessel wall and rod and rope probes:
• For smooth metallic walls: > 50 mm (2 in)
• For plastic walls: > 300 mm (12 in) to metallic parts outside the vessel
• For concrete walls: > 500 mm (20 in), otherwise the permitted measuring range may be
reduced.
• Distance (B) between rod probes and internal fittings (3): > 300 mm (12 in)
• When using more than one Levelflex:
Minimum distance between the sensor axes: 100 mm (3.94 in)
• Distance (C) from the end of the probe to the bottom of the vessel:
• Rope probe: > 150 mm (6 in)
• Rod probe: > 10 mm (0.4 in)
• Coax probe: > 10 mm (0.4 in)
Coax probes can be mounted at any distance to the wall and internal fixtures.
5.1.2 Securing the probe
Securing rope probes
1
A
C
B
2
A0012609
A Rope sag: ≥ 10 mm/(1 m probe length) [0.12 in/(1 ft probe length)]
B Reliably grounded end of probe
C Reliably insulated end of probe
1 Fastener in female thread of probe end weight
2 Insulated fastening kit

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Endress+Hauser 11
• The end of the rope probe must be secured (fixed down) under the following conditions:
If the probe would otherwise temporarily come into contact with the vessel wall, the cone,
internal fittings/beams or another part of the installation
• A female thread is provided in the probe weight to secure the end of the probe:
Rope 4 mm (1/6"), 316: M 14
• When fixed down, the end of the probe must be either reliably grounded or reliably
insulated. Use an insulated fastening kit if it is not otherwise possible to secure the probe
with a reliably insulated connection.
• To prevent an extremely high tensile load (e.g. due to thermal expansion) and the risk of
the rope breaking, the rope must be slack. Required sag: ≥ 10 mm/(1 m rope length) [ 0.12
in/(1 ft rope length)].
Pay attention to the tensile loading capacity of rope probes.
Securing rod probes
• In the case of WHG approval: a support is required for probe lengths ≥ 3 m (10 ft).
• In general, rod probes must be secured in the event of horizontal flow (e.g. from an
agitator) or strong vibrations.
• Only secure rod probes directly at the end of the probe.

Mounting Levelflex FMP51 Modbus
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mm (in)
ø a
ø b
»50 (1.97)
1
2
3
»50 (1.97)
4
5
6
ø<25 (1.0)
3 (0.12)»
A0012607
Unit of measurement mm (in)
1 Probe rod, uncoated
2 Sleeve with narrow bore to ensure electrical contact between the sleeve and the rod.
3 Short metal pipe, e.g. welded in place
4 Probe rod, coated
5 Plastic sleeve, e.g. PTFE, PEEK, PPS
6 Short metal pipe, e.g. welded in place
Probe Ø 8 mm (0.31 in)
• a < Ø 14 mm (0.55 in)
• b = Ø 8.5 mm (0.34 in)
Probe Ø 12 mm (0.47 in)
• a < Ø 20 mm (0.78 in)
• b = Ø 12.5 mm (0.52 in)

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Probe Ø 16 mm (0.63 in)
• a < Ø 26 mm (1.02 in)
• b = Ø 16.5 mm (0.65 in)
NOTICE
Poor grounding of the probe end may cause incorrect measurements.
‣Use a sleeve with a narrow bore to ensure good electrical contact between the sleeve and
the probe rod.
NOTICE
Welding can damage the main electronics module.
‣Before welding: Ground the probe rod and remove the electronics.
Securing coax probes
For WHG approval: a support is required for probe lengths ≥ 3 m (10 ft).
A0012608
Coax probes can be secured (fixed) at any point in the ground tube.
5.1.3 Shortening the probe
See Operating Instructions.

Mounting Levelflex FMP51 Modbus
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5.2 Mounting the device
5.2.1 Mounting devices with a threaded connection
A0012528
Screw the device with the threaded connection into a sleeve or flange and then secure it to the
process vessel via the sleeve/flange.
• When screwing into place, turn by the hex bolt only:
• Thread 3/4": 36 mm
• Thread 1-1/2": 55 mm
• Maximum permissible tightening torque:
• Thread 3/4": 45 Nm
• Thread 1-1/2": 450 Nm
• Recommended torque when using the supplied aramid fiber seal and a process
pressure of 40 bar (only FMP51, no seal is included with FMP54):
• Thread 3/4": 25 Nm
• Thread 1-1/2": 140 Nm
• When installing in metal vessels, ensure there is good metal contact between the
process connection and the vessel.
5.2.2 Mounting devices with a flange
If a seal is used to mount the device, use uncoated metal screws to ensure good electrical
contact between the process flange and the probe flange.
5.2.3 Mounting rope probes
NOTICE
Electrostatic discharge can damage the electronics.
‣Ground the housing before lowering the rope probe into the vessel.

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*
A0012852
Pay attention to the following when introducing the rope probe into the vessel:
• Uncoil the rope slowly and lower it carefully into the vessel.
• Make sure the rope does not bend or buckle.
• Avoid uncontrolled swinging of the weight, as this could damage internal fittings in the
vessel.
5.2.4 Turning the transmitter housing
To provide easier access to the connection compartment or display module, the transmitter
housing can be turned:
max. 350°
8 mm
8 mm
2. 3.1.
A0032242
1. Unscrew the securing screw using an open-ended wrench.
2. Rotate the housing in the desired direction.
3. Tighten the securing screw (1.5 Nm for plastic housing; 2.5 Nm for aluminum or
stainless steel housing).

Mounting Levelflex FMP51 Modbus
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5.2.5 Turning the display
Opening the cover
2.
1.
3 mm
A0021430
1. Loosen the screw of the securing clamp of the electronics compartment cover using an
Allen key (3 mm) and turn the clamp 90 ° counterclockwise.
2. Unscrew the electronics compartment cover and check the cover seal; replace it if
necessary.
Turning the display module
1.
2.
A0036401
1. Pull out the display module with a gentle rotational movement.
2. Turn the display module to the desired position: Max. 8 × 45 ° in each direction.
3. Feed the coiled cable into the gap between the housing and main electronics module
and plug the display module into the electronics compartment until it engages.

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Closing the cover of the electronics compartment
1.
2. 2.5 Nm
3 mm
A0021451
1. Screw down the cover of the electronics compartment.
2. Turn the securing clamp 90 ° in the clockwise direction and, using an Allen key (3 mm),
tighten the screw of the securing clamp on the electronics compartment cover with
2.5 Nm.

Electrical connection Levelflex FMP51 Modbus
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6 Electrical connection
6.1 Connecting requirements
6.1.1 Terminal assignment
Modbus
Connection to a Modbus master
1
2
!
!
3
4
5
open
Fieldbus
+ -
31 2
10.5...29V=
A (+)
B (-)
GND
[30]
Modbus
4-wire 71372391
Spare part
4
5
A0035159
1 Modbus master
2 Supply voltage
3 Cable entry for the Modbus connection
4 Cable entry for the supply voltage
5 Connection for protective ground
Connection to FieldCare/DeviceCare via RS485
For configuration via FieldCare or DeviceCare, it is advisable to disconnect the device
from the bus and to connect it to the computer via a USB-to-RS485 interface.

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2
3
1
!
USB RS485
!
open
Fieldbus
+ -
31 2
10.5...29V=
A (+)
B (-)
GND
[30]
Modbus
4-wire 71372391
Spare part
4
5
4
5
6
A0035158
1 Computer with FieldCare/DeviceCare
2 USB-RS485 interface
3 Supply voltage
4 Cable entry for RS485
5 Cable entry for the supply voltage
6 Connection for protective ground

Electrical connection Levelflex FMP51 Modbus
20 Endress+Hauser
Connection to DeviceCare/FieldCare via service interface
1
2
3
A0032466
1 Service interface (CDI) of the measuring device (= Endress+Hauser Common Data Interface)
2 Commubox FXA291
3 Computer with DeviceCare/FieldCare operating tool
6.1.2 Power supply
Supply voltage 10.5 to 29 VDC
Ripple 1 VSS (< 100 Hz); 10 mVSS (> 100 Hz)
6.1.3 Overvoltage protection
See Operating Instructions.