Endress+Hauser Micropilot FMR51 Technical specifications

Products Solutions Services
Brief Operating Instructions
Micropilot FMR51, FMR52
HART
Free space 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
KA01100F/00/EN/06.22-00
71575721
2022-08-01

Associated documentation Micropilot FMR51, FMR52 HART
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 used
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.

Micropilot FMR51, FMR52 HART 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.
• Interior ground terminal; protective earth is connected to the mains supply.
• Exterior ground terminal; device is connected to the plant grounding system.
2.1.3 Tool symbols
Tool symbols
Flat-blade screwdriver
Allen key
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 Micropilot FMR51, FMR52 HART
4 Endress+Hauser
1.
,
2.
,
3.
Series of steps
Result of a step
Visual inspection
1, 2, 3, ...
Item numbers
A, B, C, ...
Views
3 Basic safety instructions
3.1 Requirements for the personnel
Personnel must meet the following requirements to perform their tasks:
‣Trained, qualified specialists must have a relevant qualification for this specific function
and task.
‣Personnel must be authorized by the plant owner/operator.
‣They must be familiar with national regulations.
‣Before starting work, personnel must read and understand the instructions in the manual
and supplementary documentation as well as the certificates (depending on the
application).
‣They must follow instructions and comply with general policies.
3.2 Intended use
Application and media
The measuring device described in these Operating Instructions is intended for continuous,
non-contact level measurement in liquids, pastes and sludges. Due to its operating frequency
of approx. 26 GHz, a maximum radiated pulsed power of 5.7 mW and an average power
output of 0.015 mW(for the version with advanced dynamics: maximum pulsed power:
23.3 mW; average power output: 0.076 mW), the device can also be used without restrictions
outside closed metal vessels (for example, above basins, open channels or heaps). Operation is
completely harmless to humans and animals.
If the limit values specified in the "Technical data" and the conditions listed in the instructions
and additional documentation are observed, the measuring device may be used only for the
following measurements:
‣Measured process variables: level, distance, signal strength
‣Calculated process variables: volume or mass in vessels of any shape; flow rate through
measuring weirs or channels (calculated based on the level using the linearization
functionality)

Micropilot FMR51, FMR52 HART 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 are
sufficiently resistant.
‣Observe the limit values in the "Technical data".
Incorrect use
The manufacturer is not liable for damage caused by using the device incorrectly or for
purposes for which it was not intended.
Clarification in the case of 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 elevated fluid 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 as per national regulations.
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 ensuring trouble-free operation of the device.
Hazardous area
To eliminate danger to persons or the facility when the device is used in the hazardous area
(e.g. explosion protection):
‣Check the nameplate to verify if the device ordered can be put to its intended use in the
hazardous area.
‣Observe the specifications in the separate supplementary documentation that is an integral
part of these instructions.
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.

Incoming acceptance and product identification Micropilot FMR51, FMR52 HART
6 Endress+Hauser
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?
• Does the data on the nameplate match the order specifications on the delivery note?
• Is the DVD with the operating tool present?
If required (see nameplate), have the Safety Instructions (XA) been provided?
If one of these conditions is not met, please contact your Endress+Hauser sales office.
4.2 Storage and transport
4.2.1 Storage conditions
• Permitted storage temperature: –40 to +80 °C (–40 to +176 °F)
• Use original packaging.

Micropilot FMR51, FMR52 HART Incoming acceptance and product identification
Endress+Hauser 7
4.2.2 Transporting the product to the measuring point
NOTICE
Housing or antenna horn may become damaged or break 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.) to the process connection and never to
the electronic housing or antenna horn. 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 over 18 kg (39.6 lbs),
(IEC61010).
A0016875

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5 Mounting
5.1 Mounting location
A
123
A0016882
A Recommended distance from wall to nozzle outer edge ~ 1/6 of the vessel diameter. However, the
device must not under any circumstances be mounted closer than 15 cm (5.91 in) to the tank wall.
1 Use of a weather protection cover; protection from direct sunlight or rain
2 Installation in the center, interference can cause signal loss
3 Do not install above the filling curtain

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5.2 Orientation
5.3 Internal vessel fittings
α
A0018944
Avoid the location of internal fittings (limit switches, temperature sensors, struts, vacuum
rings, heating coils, baffles etc.) inside the signal beam. Take into account the beam angle.
5.4 Avoiding interference echoes
α
A0016890

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Metal orifice plates installed at an angle to scatter the radar signals help prevent interference
echoes.
5.5 Beam angle
The beam angle is defined as the angle α at which the energy density of the radar waves
reaches half the value of the maximum energy density (3dB width). Microwaves are also
emitted outside the signal beam and can be reflected off interfering installations.
a
D
W
a
D_
=2
2. . tan
W
A0016891
 1 Relationship between beam angle α, distance D and beam diameter W
The beamwidth diameter W depends on the beam angle α and the distance D.

Micropilot FMR51, FMR52 HART Mounting
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FMR51
Antenna size 40 mm (1½ in) 50 mm (2 in) 80 mm (3 in) 100 mm (4 in)
Beam angle α 23° 18° 10° 8°
Distance (D) Beam diameter W
3 m (9.8 ft) 1.22 m (4 ft) 0.95 m (3.1 ft) 0.53 m (1.7 ft) 0.42 m (1.4 ft)
6 m (20 ft) 2.44 m (8 ft) 1.9 m (6.2 ft) 1.05 m (3.4 ft) 0.84 m (2.8 ft)
9 m (30 ft) 3.66 m (12 ft) 2.85 m (9.4 ft) 1.58 m (5.2 ft) 1.26 m (4.1 ft)
12 m (39 ft) 4.88 m (16 ft) 3.80 m (12 ft) 2.1 m (6.9 ft) 1.68 m (5.5 ft)
15 m (49 ft) 6.1 m (20 ft) 4.75 m (16 ft) 2.63 m (8.6 ft) 2.10 m (6.9 ft)
20 m (66 ft) 8.14 m (27 ft) 6.34 m (21 ft) 3.50 m (11 ft) 2.80 m (9.2 ft)
25 m (82 ft) 10.17 m (33 ft) 7.92 m (26 ft) 4.37 m (14 ft) 3.50 m (11 ft)
30 m (98 ft) - 9.50 m (31 ft) 5.25 m (17 ft) 4.20 m (14 ft)
35 m (115 ft) - 11.09 m (36 ft) 6.12 m (20 ft) 4.89 m (16 ft)
40 m (131 ft) - 12.67 m (42 ft) 7.00 m (23 ft) 5.59 m (18 ft)
45 m (148 ft) - - 7.87 m (26 ft) 6.29 m (21 ft)
60 m (197 ft) - - 10.50 m (34 ft) 8.39 m (28 ft)
70 m (230 ft) - - - 9.79 m (32 ft)

Mounting Micropilot FMR51, FMR52 HART
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FMR52
Antenna size 50 mm (2 in) 80 mm (3 in)
Beam angle α 18° 10°
Distance (D) Beam diameter W
3 m (9.8 ft) 0.95 m (3.1 ft) 0.53 m (1.7 ft)
6 m (20 ft) 1.9 m (6.2 ft) 1.05 m (3.4 ft)
9 m (30 ft) 2.85 m (9.4 ft) 1.58 m (5.2 ft)
12 m (39 ft) 3.80 m (12 ft) 2.1 m (6.9 ft)
15 m (49 ft) 4.75 m (16 ft) 2.63 m (8.6 ft)
20 m (66 ft) 6.34 m (21 ft) 3.50 m (11 ft)
25 m (82 ft) 7.92 m (26 ft) 4.37 m (14 ft)
30 m (98 ft) 9.50 m (31 ft) 5.25 m (17 ft)
35 m (115 ft) 11.09 m (36 ft) 6.12 m (20 ft)
40 m (131 ft) 12.67 m (42 ft) 7.00 m (23 ft)
45 m (148 ft) - 7.87 m (26 ft)
60 m (197 ft) - 10.50 m (34 ft)
5.6 Free-space installation in vessel
5.6.1 Horn antenna (FMR51)
Alignment
• Align the antenna perpendicular to the product surface.
The maximum reach of the antenna can be reduced if it is not installed perpendicular to the
product.
• A marking is provided on the flange (at a point between the flange holes), the threaded
connection or the gland to aid the alignment. This marking must be aligned towards the
tank wall as much as possible.

Micropilot FMR51, FMR52 HART Mounting
Endress+Hauser 13
AB
90°
90°
90°
90°
90°
90°
90°
90°
90°
90°
A0018974
Depending on the device version the marking may be a circle or two parallel lines.
Information concerning nozzles
To ensure optimum measurement, the antenna should protrude from the nozzle. Depending
on the antenna size, this is achieved by the following maximum nozzle heights:
Hmax
A0016820
 2 Nozzle height for horn antenna (FMR51)
Antenna Maximum nozzle height Hmax
Horn 40mm/1-1/2" 86 mm (3.39 in)
Horn 50mm/2" 115 mm (4.53 in)

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Antenna Maximum nozzle height Hmax
Horn 80mm/3" 211 mm (8.31 in)
Horn 100mm/4" 282 mm (11.1 in)
Conditions for longer nozzles
If the medium has good reflective properties, higher nozzles are also possible. The maximum
nozzle length Hmax depends on the nozzle diameter D:
Hmax
øD
A0023611
Nozzle diameter DMaximum nozzle height Hmax Recommended antenna
40 mm (1.5 in) 100 mm (3.9 in) Horn 40mm/1-1/2"
50 mm (2 in) 150 mm (5.9 in) Horn 50mm/2"
80 mm (3 in) 250 mm (9.8 in) Horn 80mm/3"
100 mm (4 in) 500 mm (19.7 in) Horn 100mm/4"
150 mm (6 in) 800 mm (31.5 in) Horn 100mm/4"
Note the following if the antenna does not project out of the nozzle:
• The end of the nozzle must be smooth and free from burrs. The edge of the nozzle
should be rounded if possible.
• Mapping must be performed.
• Please contact Endress+Hauser for applications with nozzles that are higher than
indicated in the table.
• For mounting in long nozzles, the device is available with an antenna extension of up
to 1 000 mm (39.4 in) (accessory). This allows the antenna to project out of the
nozzle.
• The antenna extension may cause interference echoes in the near range. This means
that the maximum measurable level may be reduced.

Micropilot FMR51, FMR52 HART Mounting
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Information concerning threaded connections
For devices with a threaded connection, it may be necessary - depending on the antenna
size - to first disassemble the horn and then mount it again after screwing in the device.
• Tighten by the hexagonal nut only.
• Tool: open-ended wrench 55 mm
• Maximum permissible torque: 60 Nm (44 lbf ft)
5.6.2 Horn antenna, flush mount (FMR52)
Alignment
• Align the antenna perpendicular to the product surface.
The maximum reach of the antenna can be reduced if it is not installed perpendicular to the
product.
• A marking is provided on the flange (at a point between the flange holes) or the gland to
aid the alignment. This marking must be aligned towards the tank wall as much as possible.
AB
90°
90°
90°
90°
90°
90°
90°
90°
90°
90°
A0018974
Depending on the device version the marking may be a circle or two parallel lines.

Mounting Micropilot FMR51, FMR52 HART
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Information concerning nozzles
Hmax
A0016819
 3 Nozzle height for horn antenna, flush mount (FMR52)
Antenna Maximum nozzle height Hmax
Horn 50mm/2" 500 mm (19.7 in)
Horn 80mm/3" 500 mm (19.7 in)
• For flanges with PTFE cladding: Observe the instructions for mounting cladded flanges
• The PTFE flange cladding normally acts simultaneously as a seal between the nozzle
and the device flange
• Please contact the manufacturer's support service for applications with nozzles that are
higher than indicated in the table.
Mounting cladded flanges
Note the following for cladded flanges:
• Use the same number of flange screws as the number of flange bores provided.
• Tighten the screws with the necessary torque (see Table).
• Retighten after 24 hours or after the first temperature cycle.
• Depending on the process pressure and temperature, check and retighten the screws,
where necessary, at regular intervals.
The PTFE flange cladding normally acts simultaneously as a seal between the nozzle and
the device flange.
Flange size Number of screws Tightening torque
EN
DN50 PN10/16 4 45 to 65 Nm
DN50 PN25/40 4 45 to 65 Nm
DN80 PN10/16 8 40 to 55 Nm
DN80 PN25/40 8 40 to 55 Nm
DN100 PN10/16 8 40 to 60 Nm
DN100 PN25/40 8 55 to 80 Nm

Micropilot FMR51, FMR52 HART Mounting
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Flange size Number of screws Tightening torque
DN150 PN10/16 8 75 to 115 Nm
ASME
NPS 2" Cl.150 4 40 to 55 Nm
NPS 2" Cl.300 8 20 to 30 Nm
NPS 3" Cl.150 4 65 to 95 Nm
NPS 3" Cl.300 8 40 to 55 Nm
NPS 4" Cl.150 8 45 to 70 Nm
NPS 4" Cl.300 8 55 to 80 Nm
NPS 6" Cl.150 8 85 to 125 Nm
NPS 6" Cl.300 12 60 to 90 Nm
NPS 8" Cl.150 8 115 to 170 Nm
NPS 8" Cl.300 12 90 to 135 Nm
JIS
10K 50A 4 40 to 60 Nm
10K 80A 8 25 to 35 Nm
10K 100A 8 35 to 55 Nm
10K 150A 8 75 to 115 Nm
5.7 Container with heat insulation
1
2
A0032207
If process temperatures are high, the device should be included in the usual container
insulation system (2) to prevent the electronics from heating as a result of thermal radiation
or convection. The insulation should not be higher than the neck of the device (1).
5.8 Turning the transmitter housing
To provide easier access to the connection compartment or display module, the transmitter
housing can be turned:

Mounting Micropilot FMR51, FMR52 HART
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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).
5.9 Turning the display
5.9.1 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.
5.9.2 Turning the display module
1.
2.
A0036401

Micropilot FMR51, FMR52 HART Electrical connection
Endress+Hauser 19
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.
5.9.3 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.
6 Electrical connection
6.1 Connecting requirements
6.1.1 Terminal assignment

Electrical connection Micropilot FMR51, FMR52 HART
20 Endress+Hauser
Terminal assignment, 2-wire: 4 to 20 mA HART
1
+
2
-
A
1
+
2
-
B
1
2
33
A0036498
 4 Terminal assignment, 2-wire: 4 to 20 mA HART
A Without integrated overvoltage protection
B With integrated overvoltage protection
1 Connection 4 to 20 mA, HART passive: terminals 1 and 2, without integrated overvoltage protection
2 Connection 4 to 20 mA, HART passive: terminals 1 and 2, with integrated overvoltage protection
3 Terminal for cable shield
Block diagram, 2-wire: 4 to 20 mA HART
5
4
1
2
3
++
--
Y
I
6
1
2
A0036499
 5 Block diagram, 2-wire: 4 to 20 mA HART
1 Active barrier for power supply (e.g. RN221N); observe terminal voltage
2 Resistor for HART communication (≥ 250 Ω); observe maximum load
3 Connection for Commubox FXA195 or FieldXpert SFX350/SFX370 (via VIATOR Bluetooth modem)
4 Analog display unit; observe maximum load
5 Cable screen; observe cable specification
6 Measuring device