Endress+Hauser Prosonic M FMU40 Manual

TI00365F/00/EN/15.12
71197996
Technical Information
Prosonic M FMU40/41/42/43/44
Ultrasonic Level Measurement
Compact transmitters for non-contact level measurement of fluids,
pastes and coarse bulk materials
Application
• Continuous, non-contact level measurement in fluids,
pastes, sullages and coarse bulk materials
• Flow measurement in open channels and measuring
weirs
• System integration via:
– HART (standard), 4 to 20mA
–PROFIBUSPA
– FOUNDATION Fieldbus
• Maximum measuring range:
– FMU40: 5 m (16 ft) in fluids,
2 m (6.6 ft) in bulk materials
– FMU41: 8 m (26 ft) in fluids,
3,5 m (11 ft) in bulk materials
– FMU42: 10 m (33 ft) in fluids,
5 m (16 ft) in bulk materials
– FMU43: 15 m (49 ft) in fluids,
7 m (23 ft) in bulk materials
– FMU44: 20 m (66 ft) in fluids,
10 m (33 ft) in bulk materials
Features and benefits
• Quick and simple commissioning via menu-guided on-
site operation with four-line plain text display;
7 languages selectable
• Envelope curves on the on-site display for simple
diagnosis
• Easy remote operation, diagnosis and measuring point
documentation with the free operating program
FieldCare supplied.
• Suitable for explosion hazardous areas
(Gas-Ex, Dust-Ex)
• Linearization function (up to 32 points) for conversion
of the measured value into any unit of length, volume
or flow rate
• Non-contact measurement method minimizes service
requirements
• Optional remote display and operation (up to 20 m
(66 ft) from transmitter)
• Installation possible from thread G 1½“ or 1½“ NPT
upwards
• Integrated temperature sensor for automatic
correction of the temperature dependent sound
velocity

Prosonic M
2Endress+Hauser
Table of contents
Function and system design. . . . . . . . . . . . . . . . . . . . . 3
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Equipment architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Measuring range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operating frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Load HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Output damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Terminal compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Fieldbus plug connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cable entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Current consumption (2 wire instruments) . . . . . . . . . . . . . . . . 14
HART ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Max. noise HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Galvanic isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Performance characteristics. . . . . . . . . . . . . . . . . . . . 15
Reaction time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reference operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Measured value resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pulse frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maximum measuring error . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Typical measuring error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Influence of the vapor pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installation variants FMU40, FMU41 . . . . . . . . . . . . . . . . . . . . . 16
Installation variants FMU42, FMU44 . . . . . . . . . . . . . . . . . . . . . 16
Installation variants FMU43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Installation conditions for level measurements . . . . . . . . . . . . . . 17
Installation in narrow shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installation conditions for flow measurements . . . . . . . . . . . . . . . 18
Blocking distance, nozzle installation . . . . . . . . . . . . . . . . . . . . . 20
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Resistance to alternating temperature cycles . . . . . . . . . . . . . . . . 21
Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Ingress protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electromagnetic compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . 21
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Process temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Process pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . 22
Design; dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Process connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Material (not in contact with process) . . . . . . . . . . . . . . . . . . . . . 26
Material (in contact with process) . . . . . . . . . . . . . . . . . . . . . . . . 27
Operability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Display and operating elements . . . . . . . . . . . . . . . . . . . . . . . . . 28
On-site operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Remote operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Certificates and Approvals . . . . . . . . . . . . . . . . . . . . . 31
CE mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Ex approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
External standards and guidelines . . . . . . . . . . . . . . . . . . . . . . . . 31
Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . 32
Product structure FMU40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Product structure FMU41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Product structure FMU42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Product structure FMU43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Product structure FMU44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5-point linearity protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Installation bracket for FMU40, FMU41 . . . . . . . . . . . . . . . . . . . 41
Screw in flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Cantilever with mounting frame or wall bracket . . . . . . . . . . . . . 43
Commubox FXA195 HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Commubox FXA291 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ToF Adapter FXA291 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Remote display FHX40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Operating manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Description of device functions . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Short instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Safety Instructions ATEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Safety Instructions NEPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Control drawings, Installation drawings . . . . . . . . . . . . . . . . . . . 50

Prosonic M
Endress+Hauser 3
Function and system design
Measuring principle
A0019264
BD Blocking distance D Distance from sensor membrane - product surface
E Empty distance F Span (full distance)
L Level
Time-of-flight method
The sensor of the Prosonic M transmits ultrasonic pulses in the direction of the product surface. There, they
are reflected back and received by the sensor. The Prosonic M measures the time t between pulse transmission
and reception. The instrument uses the time t (and the velocity of sound c) to calculate the distance D between
the sensor membrane and the product surface:
D = c t/2
As the device knows the empty distance E from a user entry, it can calculate the level as follows:
L = E - D
An integrated temperature sensor (NTC) compensates for changes in the velocity of sound caused by
temperature changes.
Interference echo suppression
The interference echo suppression feature on the Prosonic M ensures that interference echos (e.g. from edges,
welded joints and installations) are not interpreted as a level echo.
Calibration
Enter the empty distance E and the span F to calibrate the device.
Blocking distance
Span F may not extend into the blocking distance BD. Level echos within the blocking distance cannot be
evaluated due to the transient characteristics of the sensor.
20 mA
100%
4 mA
0%
D
L
F
E
BD
Sensor BD Max. range fluids Max. range bulk materials
FMU40 0.25 (0.8) 5 (16) 2 (6.6)
FMU41 0.35 (1.1) 8 (26) 3.5 (11)
FMU42 0.4 (1.3) 10 (33) 5 (16)
FMU43 0.6 (2.0) 15 (49) 7 (23)
FMU44 0.5 (1.6) 20 (66) 10 (33)
m (ft)

Prosonic M
4Endress+Hauser
Equipment architecture 4…20 mA output with HART protocol
The complete measuring system consists of:
A0019266
1 PLC (programmable logic controller)
2 Commubox FXA191 (RS232) or FXA195 (USB)
3 Computer with operating tool (e.g. FieldCare)
4 Commubox FXA291 with ToF Adapter FXA291
5 Power supply (for 4-wire)
6 Prosonic with display and operating modul
7 Field Xpert SFX100
8 VIATOR Bluetooth modem with connection cable
9 Connection for Commubox FXA191, FXA195 or Field Xpert SFX100
10 Transmitter supply unit RMA422 or RN221N (communication resistor included)
If the HART communication resistor is not built into the supply unit, it is necessary to insert a communication
resistor of 250 into the 2-wire line.
On-site operation
• With display and operating module,
• With a Personal Computer, FXA291 with ToF Adapter FXA291 (USB) and the operating software
"FieldCare". FieldCare is a graphical operating software for instruments (radar, ultrasonic, guided
microimpulse). It assists with commissioning, securing data, signal analysis and documentation of the
measuring point.
Remote operation
• With Field Xpert SFX100
• With a Personal Computer, Commubox FXA195 and the operating software "FieldCare"
ENDRESS + HAUSER
E
+–
%
ENDRESS+ HAUSER
RMA422
24
6789
10
5
13

Prosonic M
Endress+Hauser 5
System integration using PROFIBUS PA
A maximum of 32 transmitters (8 if mounted in an explosion hazardous location Ex ia IIC according to FISCO-
model) can be connected to the bus.The segment coupler provides the operating voltage to the bus. Both on-
site as well as remote operation are possible. For further information on the cable specifications, see Operating
Instructions BA00034S/04/ENGuidelines for planning and commissioning PROFIBUS DP/PA", PNO
Guideline 2.092 "PROFIBUS PA User and Installation Guideline" and IEC61158-2 (MBP).
A0019308
1 Computer with Profiboard/Proficard and operating tool (FieldCare)
2 PROFIBUS DP
3 PLC (programmable logic controller)
4 More functions (valves etc.)
5 Computer with operating tool (FieldCare)
6 Commubox FXA291 with ToF Adapter FXA291
7 Levelflex M
8 Prosonic M
9 Micropilot M with display and operating modul
10 PROFIBUS PA
11 Segment coupler
ENDRESS+ HAUSERENDRESS+ HAUSER
T
13
211
10
4
5
6
7
89
ENDRESS+ HAUSER
E+–
%

Prosonic M
6Endress+Hauser
System integration using FOUNDATION Fieldbus
A maximum of 32 transmitters (standard or Ex d) can be connected to the bus. For protection class Ex ia: the
maximum number of transmitters depends on the established rules and standards for intrinsically safe circuits
(EN 60070-14) and proof of instrinsic safety. Both on-site and remote operation are possible.
A0019309
1 SPS, PLC, API
2 Personal computer, e.g. with NI-FBUS configurator
3 VIATOR Bluetooth modem with connection cable
4 Field Xpert SFX100
5 More functions (valves etc.)
6FieldCare
7 Commubox FXA291 with ToF Adapter FXA291
8 Levelflex M
9 Prosonic M
10 Micropilot M
11 Power conditioner
12 Power supply
13 FF link
14 FOUNDATION Fieldbus
15 Ethernet
TT
15
1314
1
6
5
7
11
12
34
8910
2

Prosonic M
Endress+Hauser 7
System integration using Endress+Hauser Rackbus
You can interconnect a maximum of 64 2-wire devices with HART protocol to a Rackbus. Use an FXN672
interface module for each device. You can integrate this bus into a higher-level bus by using gateway.
A0019307
1InterfaceFXN672
2 Personal computer with communication software
3Bus
4 PLC
5 Gateway to MODBUS, FIP, PROFIBUS, INTERBUS etc.
6 4-20 mA HART
7 FieldCare
8 Commubox FXA291 with ToF Adapter FXA291
9 Levelflex M
10 Prosonic M
11 Micropilot M with display and operating modul
Note!
The FXN672 can be used with all 2-wire devices of the Prosonic M family.
FXN 671
mA1
+
FXN 671
mA1
+
FXN 671
mA1
+
ENDRESS+ HAUSER
E+–
%
3
9
24
1
7
1011
8
5
6

Prosonic M
8Endress+Hauser
System integration via Fieldgate
Vendor Managed Inventory
By using Fieldgates to interrogate tank or silo levels remotely, suppliers of raw materials can provide their
regular customers with information about the current supplies at any time and, for example, account for them
in their own production planning. For their part, the Fieldgates monitor the configured level limits and, if
required, automatically activate the next supply. The spectrum of options here ranges from a simple purchasing
requisition via e-mail through to fully automatic order administration by coupling XML data into the planning
systems on both sides.
Remote maintenance of measuring equipment
Fieldgates not only transfer the current measured values, they also alert the responsible standby personnel, if
required, via e-mail or SMS. In the event of an alarm or also when performing routine checks, service
technicians can diagnose and configure connected HART devices remotely. All that is required for this is the
corresponding HART operating software (e.g. FieldCare) for the connected device. Fieldgate passes on the
information transparently, so that all options for the respective operating software are available remotely. Some
on-site service operations can be avoided by using remote diagnosis and remote configuration and all others
can at least be better planned and prepared.
A0019306
The complete measuring system consists of devices and:
1 Fieldgate FXA520
2 Multidrop Connector FXN520
Note!
The number of instruments which can be connected in mutidrop mode can be calculated by the "FieldNetCalc"
program. A description of this program can be found in Technical Information TI00400F/00/EN
(Multidrop Conncector FXN520).
The program is available form your Endress+Hauser sales organisation or in the internet at: "www.endress.com
select your country download search: Fieldnetcalc
-
ENDRESS+HAUSER
RN221N ENDRESS+HAUSER RN221N
.
20...45VDC
FXN 520 FXN 520
112

Prosonic M
Endress+Hauser 9
Input
Measured variable The distance D between the sensor membrane and the product surface is measured.
Using the linearization function, the device uses D to calculate:
• level L in any units
• volume V in any units
• Flow Q across measuring weirs or open channels in any units
Measuring range The measuring range is limited by the range of a sensor. The sensor range is, in turn, dependent on the
operating conditions. To estimate the actual range, proceed as follows (see also the calculation example in the
diagram):
1. Determine which of the influences shown in the following table are appropriate for your process.
2. Add the corresponding attenuation values.
3. From the total attenuation, use the diagram to calculate the range.
Fluid surface Attenuation
Calm 0 dB
Waves 5 to 10 dB
Strong turbulence (e.g. stirrers) 10 to 20 dB
Foaming Please contact your Endress+Hauser sales representative.
Bulk material surface Attenuation
Hard, rough (e.g. rubble) 40 dB
Soft (e.g. peat, dust-covered clinker) 40 to 60 dB
Dust Attenuation
No dust formation 0 dB
Little dust formation 5 dB
Heavy dust formation 5 to 20 dB
Filling curtain in detection range Attenuation
None 0 dB
Small quantities 5 to 10 dB
Large quantities 10 to 40 dB
Temperature difference between
sensor and product surface
Attenuation
to 20 °C (68 °F) 0 dB
to 40 °C (104 °F) 5 to 10 dB
to 80 °C (176 °F) 10 to 20 dB

Prosonic M
10 Endress+Hauser
A0019268
A Attenuation (dB)
R Range (m)
Example (for FMU43)
For typical solid applications, a certain amount of dust coverage is normally present. Therefore, the following
range results from the table and the diagram:
These measuring conditions have been taken into account during the calculation of the maximum measuring
range in solid applications.
Operating frequency
10 20 304050607080
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
FMU44
A [dB]
R[m]
0
FMU43
FMU42
FMU41
FMU40
• Dust-covered rubble approx. 50 dB
• No dust formation 0 dB
• No filling curtain in
detection range 0 dB
• Temperature diff. < 20°C 0 dB
approx. 50 dB range approx. 7 m (23 ft)
Sensor Operating frequency
FMU40 approx. 70 kHz
FMU41 approx. 50 kHz
FMU42 approx. 42 kHz
FMU43 approx. 35 kHz
FMU44 approx. 30 kHz

Prosonic M
Endress+Hauser 11
Output
Output signal According to the instrument version ordered:
• 4…20 mA with HART protocol
• PROFIBUS PA
• FOUNDATION Fieldbus
Signal on alarm Error information can be accessed via the following interfaces:
• On-site display (error symbol, error code and plain text description)
• Current output, signal on error can be selected (e.g. according to NAMUR recommendation NE43)
• Digital interface
Load HART Minimum load for HART communication: 250 
Output damping Freely selectable, 0 to 255 s
Linearization The linearization function of the Prosonic M allows conversion of the measured value into any unit of length
or volume. In open channels or measuring weirs, also a flow linearization is possible (calculation of the flow
from the measured level). The linearization table for calculating the volume in an horizontal cylindrical tank is
preprogrammed. You can also enter any number of other tables containing up to 32 value pairs either manually
or semi-automatically (by filling the vessel under controlled conditions).
The supplied FieldCare operating program can automatically calculate the table for any tank, weir or flume and
upload it into the device.
Flow curves for open channels can be calculated and entered into the instrument by the FieldCare as well
(ä29, "Operation with FieldCare").

Prosonic M
12 Endress+Hauser
Power supply
Terminal compartment In the F12 housing, the terminals are located underneath the housing cover. In the T12 housing, they are under
the cover of the separate terminal compartment.
A0019271
AF12 housing
BT12 housing
1 Sealed terminal compartment
Terminal assignment
A0019268
ALoop-powered version 3 Plant ground
B4-wire version (active) 4 4-20 mA HART
1 Power 5 Display unit, recorder, PCS
2 Test clamp for testing of the signal current
• Connect the connecting line to the screw terminals (line cross-sections of 0.5 to 2.5mm(20 to 14 AWG))
in the terminal compartment.
• Use 2-wire twisted pair cable with screen for the connection.
• Protective circuitry against reverse polarity, RFI and over-voltage peaks is built into the device (see also
Technical Information TI00241F/00/EN "EMC Test Procedures") ä21, "Electromagnetic compatibility
(EMC)".
• A standard installation cable is sufficient if only the analogue signal is used. Use a screened cable when
working with a superimposed communication signal (HART).
1
AB
2
1
4
AB
33
1234 5612
L- L+ I+ I- I+ I-
L1/L+ N/L-
4
15

Prosonic M
Endress+Hauser 13
The digital communication signal is transmitted to the bus via a 2-wire connection. The bus also provides the
auxiliary energy. Use 2-wire twisted pair cable with screen.
Refer to the following operating manuals for information on cable types, and how to set up and ground the
network:
• BA00034S "PROFIBUS DP/PA: "Guidelines for planning and commissioning PROFIBUS DP/PA", PNO
Guideline 2.092 "PROFIBUS PA User and Installation Guideline" and IEC61158-2 (MBP).
• BA00013S "FOUNDATION Fieldbus Overview", FONDATION Fieldbus Guideline and IEC61158-2 (MBP).
Fieldbus 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 (PROFIBUS PA plug)
Pin assignment of the 7/8" plug connector (FOUNDATION Fieldbus plug)
Supply voltage HART, 2-wire
The following values are the voltages across the terminals directly at the instrument:
PROFIBUS PA
A0019276
1T-Box
2 PROFIBUS PA
3 Plant ground
FOUNDATION Fieldbus
A0019275
34 12
+–
3
12
34 12
+–
3
A0011175
Pin Meaning
1 Signal +
2notconnected
3 Signal -
4 Ground
A0011176
Pin Meaning
1 Signal -
2 Signal +
3Shield
4 Not connected
21
3
4
+
–
nc
2
1
4
3

Prosonic M
14 Endress+Hauser
HART, 4-wire, active
Terminals Cable cross-section: 0.5 to 2.5 mm2 (20 to 14 AWG)
Cable entry • Cable gland: M20x1.5 (recommended cable diameter 6 to 10 mm (0.24 to 0.39 in))
• Cable entry G ½" or NPT ½"
• PROFIBUS PA M12 plug
• FOUNDATION Fieldbus 7/8" plug
Power consumption
Current consumption
(2 wire instruments)
HART ripple 47 to 125 Hz: Vpp = 200 mV (measured at 500 )
Max. noise HART 500 Hz to 10 kHz: Vrms = 2.2 mV (measured at 500 )
Galvanic isolation With 4-wire devices, the evaluation electronics and mains voltage are galvanically isolated from each other.
Version Current
consumption
Terminal voltage
minimum
Terminal voltage
maximum
2-wire HART
Standard
4 mA 14 V 36 V
20 mA 8 V 36 V
Ex ia
4 mA 14 V 30 V
20 mA 8 V 30 V
Ex d
4 mA 14 V 30 V
20 mA 11 V 30 V
Fixed current,
adjustable, e.g. for
solar power
operation
(measured value via
HART)
Standard 11 mA 10 V 36 V
Ex ia 11 mA 10 V 30 V
Fixed current for
HART multidrop
mode
Standard 4 mA1)
1) Start-up current 11 mA
14 V 36 V
Ex ia 4 mA114 V 30 V
Version Voltage Max. load
DC 10.5 to 32 V 600 
AC 50/60 Hz 90 to 253 V 600 
Version Power consumption
2-wire 51 mW to 800 mW
4-wire AC max. 4VA
4-wire DC; FMU40/41 330 mW to 830 mW
4-wire DC; FMU42/43 600 mW to 1 W
Communication Current consumption
HART 3.6 to 22 mA
PROFIBUS PA max. 13 mA
FOUNDATION Fieldbus max. 15 mA

Prosonic M
Endress+Hauser 15
Performance characteristics
Reaction time The reaction time depends on the parameter settings. The minimum values are:
• 2-wire devices (FMU40/41/42): min. 2 s
• 2-wire diveces (FMU43 - PROFIBUS PA or FOUNDATION Fieldbus): min. 2 s
• 2-wire devices (FMU44): min. 3 s
• 4-wire devices (FMU40/41/42/43/44): 0.5 s
Reference operating
conditions
• Temperature = +20 °C (+68 °F)
• Pressure = 1013 mbar abs. (15 psi abs.)
• Humidity = 50 %
• Ideal reflective surface (e.g. calm, smooth fluid surface)
• No interference reflections within signal beam
• Set application parameters:
– Tank shape = dome ceiling
– Medium property = liquid
– Process conditions = standard liquid
Measured value resolution
Pulse frequency • 2-wire devices (FMU40/41/42): max. 0.5Hz
• 2-wire devices (FMU43 - PROFIBUS PA or FOUNDATION Fieldbus): max. 0.5 Hz
• 2-wire devices (FMU44): max. 0.3 Hz
• 4-wire devices (FMU40/41/42/43/44): max. 2Hz
The exact values are dependent on the type of device and the parameter settings.
Maximum measuring error1) 2) ±0.2 % of the maximum span of the sensor
Typical measuring error Include linearity, repeatability and hysteresis
Better than:
Influence of the vapor
pressure
The vapor pressure at 20 °C (68 °F) gives a hint on the accuracy of the ultrasonic level measurement. If the
vapor pressure at 20 °C (68 °F) is below 50 mbar (1 psi), ultrasonic level measurement is possible with a very
high accuracy. This is valid for water, aqueous solutions, water-solid-solutions, dilute acids (hydrochloric acid,
sulfuric acid, ...), dilute bases (caustic soda, ...), oils, greases, slurries, pastes, ...
High vapor pressures or outgassing media (ethanol, acetone, ammonia, ...) can influence the accuracy. If
conditions like these are present, please contact your Endress+Hauser sales representative.
Sensor Measured value resolution
FMU40 1 mm (0.04 in)
FMU41 1 mm (0.04 in)
FMU42 2 mm (0.08 in)
FMU43 2 mm (0.08 in)
FMU44 2 mm (0.08 in)
1) according to EN 61298-2
2) with reference operating conditions
Sensor Measuring error
FMU40 ±2 mm (0.08 in) or 0.2 % of measuring distance*
FMU41 ±2 mm (0.08 in) or 0.2 % of measuring distance*
FMU42 ±4 mm (0.16 in) or 0.2 % of measuring distance*
FMU43 ±4 mm (0.16 in) or 0.2 % of measuring distance*
FMU44 ±4 mm (0.16 in) or 0.2 % of measuring distance*
* whichever is greater

Prosonic M
16 Endress+Hauser
Installation
Installation variants FMU40,
FMU41
A0019052
AInstallation with counter nut
1 Counter nut (PC) supplied for G 1½" and G 2" instruments
BInstallation with sleeve
1 Sealing (EPDM) supplied
CInstallation with installation bracket
DInstallation with screw in flange
1 Sealing (EPDM) supplied
2 Nozzle
3Sensor
4 Screw in flange
For installation bracket or adapter flange ä41, "Accessories".
Installation variants FMU42,
FMU44
A0019280
AInstallation with universal flange (Ex-hazardous, e.g. Zone 20)
BInstallation with mounting bracket (Non-Ex-hazardous, Zone 20)
ENDRESS+HAUSER
ProsonicM
ENDRESS+HAUSER
ProsonicM
AB
CD
1
1
1
2
3
4
AB
-.

Prosonic M
Endress+Hauser 17
Installation variants FMU43
A0019053
AInstallation with universal slip-on flange (option), (Ex-hazardous, e.g. Zone 20)
1Sensor
2 Nozzle
3 Slip-on flange
BInstallation with mounting bracket (Non-Ex-hazardous, Zone 20)
Installation conditions for
level measurements
A0019278
• Do not install the sensor in the middle of the tank (3). We recommend leaving a distance between the sensor
and the tank wall (1) measuring 1/6 of the tank diameter.
• Use a protective cover, in order to protect the device from direct sun or rain (2) ä41, "Weather
protection cover".
• Avoid measurements through the filling curtain (4).
• Make sure that equipment (5) such as limit switches, temperature sensors, etc. are not located within the
emitting angle . In particular, symmetrical equipment (6) such as heating coils, baffles etc. can influence
measurement.
• Align the sensor so that it is vertical to the product surface (7).
• Never install two ultrasonic measuring devices in a tank, as the two signals may affect each other.
• To estimate the detection range, use the 3 dB emitting angle .
ENDRESS+HAUSER
Prosonic M
1
3
2
AB
-.
234
1/6D
D
15
6L
r
7
Sensor Lmax rmax
FMU40 11° 5 (16) 0.48 (1.6)
FMU41 11° 8 (26) 0.77 (2.5)
FMU42 9° 10 (33) 0.79 (2.6)
FMU43 6° 15 (49) 0.79 (2.6)
FMU44 11 ° 20 (66) 1.93 (6.3)
m (ft)

Prosonic M
18 Endress+Hauser
Installation in narrow shafts
Installation conditions for flow
measurements
• Install the Prosonic M at the inflow side, as close above the maximum water level Hmax as possible (take into
account the blocking distance BD).
• Position the Prosonic M in the middle of the channel or weir.
• Align the sensor membrane parallel to the water surface.
• Keep to the installation distance of the channel or weir.
• You can enter the "Flow to Level" linearization curve ("Q/h curve") using FieldCare or manually via the on-
site display.
Example: Khafagi-Venturi flume
A0019606
AKhafagi-Venturi flume
BInflow
COutflow
BD Blocking distance
E Empty calibration
F Full calibration
V Direction of flow
In narrow shafts with strong interference echoes, we
recommend using an ultrasound guide pipe (e.g. PE
or PVC wastewater pipe) with a minimum diameter
of 100 mm (3.94 in).
Make sure that the pipe is not soiled by accumulated
dirt. If necessary, clean the pipe at regular intervals.
A0019310
1 Venting hole
1
1 x b0
b0
BD
A
E
BC
V
Hmax =F

Prosonic M
Endress+Hauser 19
Example: Triangular weir
A0019312
BD Blocking distance
E Empty calibration
F Full calibration
(= F)
min. 3 H
H
min. 2H
a
min. 2H
BD
E
max.
max.
max.
max.

Prosonic M
20 Endress+Hauser
Blocking distance,
nozzle installation
Install the Prosonic M at a height so that the blocking distance BD is not undershot, even at maximum fill level.
Use a pipe nozzle if you cannot maintain the blocking distance in any other way. The interior of the nozzle
must be smooth and may not contain any edges or welded joints. In particular, there should be no burr on the
inside of the tank side nozzle end. Note the specified limits for nozzle diameter and length. To minimise
disturbing factors, we recommend an angled socket edge (ideally 45°).
A0019311
AFMU40, FMU41
BFMU42, FMU44
CFMU43
BD Blocking distance F Full calibration (span)
SD Safety distance D Nozzle diameter
E Empty calibration L Nozzle length
Caution!
If the blocking distance is undershot, it may cause device malfunction.
Note!
In order to notice if the level approaches the blocking distance, you can specify a safety distance (SD). If the
level is within this safety distance, the Prosonic M outputs a warning or alarm message.
F
E
BD
SD
L
D
L
D
L
D
AB C
Maximum nozzle length [mm (in)]
Nozzle diameter FMU40 FMU41 FMU42 FMU43 FMU44
DN50/2" 80 (3.15) 
DN80/3" 240 (9.45) 240 (9.45) 250 (9.84) 
DN100/4" 300 (11.8) 300 (11.8) 300 (11.8) 300 (11.8) 
DN150/6" 400 (15.7) 400 (15.7) 400 (15.7) 300 (11.8) 400 (15.7)
DN200/8" 400 (15.7) 400 (15.7) 400 (15.7) 300 (11.8) 400 (15.7)
DN250/10" 400 (15.7) 400 (15.7) 400 (15.7) 300 (11.8) 400 (15.7)
DN300/12" 400 (15.7) 400 (15.7) 400 (15.7) 300 (11.8) 400 (15.7)
Sensor characteristics
Emitting angle 11° 11° 9° 6° 11°
Blocking distance [m (ft)] 0.25 (0.8) 0.35 (1.1) 0.4 (1.3) 0.6 (2.0) 0.5 (1.6)
Max. range [m (ft)]
in liquids
5 (16.0) 8 (26.0) 10 (33.0) 15 (49.0) 20 (66.0)
Max. range [m (ft)]
in solids
2 (6.6) 3.5 (11.0) 5 (16.0) 7 (23.0) 10 (33.0)