Endress+Hauser S FMU90 Specifications
TI00397F/00/EN/17.17
71352810
Products Solutions Services
Technical Information
Prosonic S FMU90
Ultrasonic measurement
A universal device for level/flow measurement and
pump control
Transmitter for up to 2 sensors
FDU90/91/91F/92/93/95
Field of application
Level measurement of fluids and bulk materials with 1 or 2 sensors for measuring of
up to 45 m (148 ft) and level limit detection. Pump control, rake control and as option:
additional pump control function.
• Calculations: average, difference, sum
• Application flow: Flow measurement in open channels and weirs with 1 or 2 sensors
• Flow measurement with back water or sludge detection
• Up to 3 totalizers and 3 counters
• Counting or time pulse output for control of external units
• Transmitter available with field housing or top hat rail housing for control cabinet
instrumentation
Benefits
• Simple, menu-guided operation with 6-line plain text display, 15 languages
selectable
• Envelope curves on the display for simple diagnosis
• Easy operation, diagnosis and measuring point documentation with the supplied
"FieldCare" operating program
• Time-of-flight correction via integrated or external temperature sensors
• Linearisation (up to 32 points, freely configurable) for the most common flumes and
weirs pre-programmed and selectable
• Online calculation of the flume-/weir-flows via integrated flow curves
• Field housing aluminium with ATEX II 3D certificate
Table of Contents
Prosonic S FMU90
Safety symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Function and system design . . . . . . . . . . . . . . . . . . . . . .4
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Blocking distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Time-of-flight correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Interference echo suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pump control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Datalog functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application examples for level measurements . . . . . . . . . . . . . 6
Application examples for flow measurements . . . . . . . . . . . . . 7
System integration HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
System integration PROFIBUS DP . . . . . . . . . . . . . . . . . . . . . . . . 8
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Sensor inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
External limit switches (option) . . . . . . . . . . . . . . . . . . . . . . . . . 9
External temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Analog outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Relay outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PROFIBUS DP interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Supply voltage / Power consumption / Current consumption 11
Galvanic isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Terminal compartment of the field housing polycarbonate . . 12
Cable entries of the field housing polycarbonate . . . . . . . . . . 12
Terminal compartment of the field housing aluminium . . . . 12
Terminal compartment of the DIN-rail housing . . . . . . . . . . . 13
Terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connection of the sensors FDU9x . . . . . . . . . . . . . . . . . . . . . . . 18
Synchronization line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connection of the separate display and operating module . . 19
Connection of external switches
(for FMU90-********B***) . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Connection of a temperature sensor . . . . . . . . . . . . . . . . . . . . . 20
Performance characteristics . . . . . . . . . . . . . . . . . . . . 24
Reference operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . 24
Maximum measuring error . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Measuring error
Measured value resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Measuring frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Influence of the vapor pressure . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ingress protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Electromagnetic compatibility (EMC) . . . . . . . . . . . . . . . . . . . . 25
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . . 25
Housing versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Dimensions of the field housing polycarbonate . . . . . . . . . . . 25
Dimensions of the field housing aluminium . . . . . . . . . . . . . . 26
Dimensions of the DIN-rail housing . . . . . . . . . . . . . . . . . . . . . 26
Dimensions of the separate display and operating module . . 28
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Operability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Display and operating module . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operating menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Basic setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Locking of the instrument. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Certificates and Approvals. . . . . . . . . . . . . . . . . . . . . . 32
CE mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
RCM-tick mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
EAC conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Ex approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
External standards and guidelines . . . . . . . . . . . . . . . . . . . . . . 32
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Commubox FXA195 HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Commubox FXA291 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Protection cover for the field housing polycarbonate . . . . . . . 33
Mounting plate for the field housing polycarbonate . . . . . . . 34
Mounting bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Adaption plate for remote display . . . . . . . . . . . . . . . . . . . . . . . 35
Overvoltage protection HAW562 . . . . . . . . . . . . . . . . . . . . . . . 35
Temperature sensor Omnigrad S TR61 . . . . . . . . . . . . . . . . . . 38
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Operating instructions
(for transmitter FMU90) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Description of Instrument Functions . . . . . . . . . . . . . . . . . . . . 39
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2 Endress+Hauser
Prosonic S FMU90
DANGER
WARNING
CAUTION
NOTICE
Safety symbols
Symbol Meaning
DANGER!
A0011189-DE
A0011190-DE
A0011191-DE
A0011192-DE
This symbol alerts you to a dangerous situation. Failure to avoid this situation will
result in serious or fatal injury.
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.
Explosion
protection
0
-
.
Meaning
Device certified for use in explosion hazardous area
If the device has this symbol embossed on its name plate it can be installed in an
explosion hazardous area
Explosion hazardous area
Symbol used in drawings to indicate explosion hazardous areas. Devices located in
and wiring entering areas with the designation “explosion hazardous areas” must
conform with the stated type of protection.
Safe area (non-explosion hazardous area)
Symbol used in drawings to indicate, if necessary, non-explosion hazardous areas.
Devices located in safe areas still require a certificate if their outputs run into
explosion hazardous areas
Endress+Hauser 3
Measuring principle
100%
0%
D
L
F
E
BD
V
Q
D
1
2
2
1
Prosonic S FMU90
Function and system design
L00-FMU90xxx-15-00-08-xx-900
1FDU9x
2Prosonic S FMU90
BD: blocking distance, D: distance from sensor membrane to fluid surface, E: empty distance F: span (full distance),
L: level, V: volume (or mass), Q: flow
The sensor transmits ultrasonic pulses in the direction of the product surface. There, they are reflected
back and received by the sensor. The transmitter Prosonic S measures the time t between pulse
transmission and reception. From t (and the velocity of sound c) it calculates the distance D from the
sensor membrane to the product surface:
D = c · t/2
From D results the desired measuring value:
• Level L
•Volume V
• Flow Q across measuring weirs or open channels
Blocking distance The span F may not extend into the blocking distance BD. Level echoes within the blocking distance
range can not be evaluated due to the transient characteristics of the sensor. The blocking distances of
the individual sensors are given in the following documents:
The blocking distances of the individual sensors are given in the following documents:
• TI00396F for the sensors FDU90/91/91F/92/93/95
1)
Time-of-flight correction In order to compensate for temperature dependent time-of-flight changes, a temperature sensor
(NTC) is integrated in the ultrasonic sensors.
Optionally, the Prosonic S FMU90 has an input for an external temperature sensor
(FMU90-********B***). The following sensor can be connected:
• Pt100
• Omnigrad S TR61 from Endress+Hauser
The external sensor must be used for the heated version of the ultrasonic sensors FDU90 and FDU91.
Interference echo suppression
Pump control Individually configurable for each pump:
The interference echo suppression feature of the Prosonic S ensures that interference echoes (e.g. from
edges, welded joints and installations) are not interpreted as a level echo.
• Pump switching delay, e.g. to prevent overload of the power supply system
• Backlash time and backlash interval, e.g. for complete draining of shafts or channels
• Crust reduction at pump shaft walls by fine adjustment of the switch point
1) The sensors FDU80/80F/81/81F/82/83/84/85/86/96 are not available anymore.
Use the serial number of your device to access the documentation for your device via www.endress.com.
4 Endress+Hauser
Prosonic S FMU90
Linearization Pre-programmed linearization curves
Types of vessels
• Horizontal, cylindrical tank
•Spherical tank
• Tank with pyramidal bottom
• Tank with conical bottom
• Tank with flat, inclined bottom
Flow curves for flumes and weirs
• Khafagi-Venturi flume
•ISO-Venturi flume
3)
-Venturi flume
•BST
• Parshall flume
• Palmer-Bowlus flume
•Rectangular weir
• Rectangular constricted weir
4)
•NFX
•NFX
rectangular weir
rectangular constricted weir
• Trapezoidal weir
• V-notch weir
V-notch weir
•BST
•NFX V-notch weir
The pre-programmed linearization curves are calculated on-line.
Linearization formula for flow measurements
Q = C (h + h)
"h" is the upstream level. The parameters , , and C can be freely programmed.
Linearization table
consisting of up to 32 linearization points; to be entered manually or half-automatically.
Special functions • limit detection
•rake control
• alternating pump control or control according to pump rate (standard)
• option: additional pump control functions
– Alternation accordint to runtime or starts
– pump feedback via the optional digital inputs; stand-by pump configurable
– pump function test after resting time
– storm function to prevent unnecessary pump running times
– flush control for regular pump shaft cleaning
– pump control according to tariff times via digital input
– output of operating hours alarm or pump alarm
– recording of pump data (operating hours, number of starts, last running time)
• totalising of the flow volume with (resettable) counters and (non-resettable) totalisers
• triggering of a sampler by time or quantity pulses
• low flow cut off
• backwater detection in flumes
• sludge detection in flumes
• trend detection
2)
5)
:
Datalog functions • Peak hold indicator of the min./max. levels or flows and the min./max. temperatures at the sensors
• Recording of the last 10 alarms
• Indication of the operating status
• Trend indication of the outputs on the on-site display
• Indication of the operating hours
2) for instrument versions with flow software (FMU90 - *2********** or FMU90-*4**********)
3) BST: British Standard
4) French standard NFX 10-311
5) for instruments with software for additional pump control (FMU90-*3********** or FMU90-*4**********)
Endress+Hauser 5
Prosonic S FMU90
min
Prosonic S
max
min
L
FDU9x
L
max
Prosonic S
L1 + L2
2
L1
L2
Prosonic S
D1
D2
M
L
Prosonic S
D
Prosonic S
Application examples for level measurements
Level measurement with limit detection and
alarm output
L00-FMU90xxx-15-00-00-xx-010
Order code e.g.: FMU90 - *1***131****
(1 input, 3 relays, 1 outputs)
Rake control
(differential measurement)
Average level measurement
Order code e.g.: FMU90 - *1***212****
(2 inputs, 2 outputs)
Alternating pump control
(up to 6 pumps)
L00-FMU90xxx-15-00-00-xx-003
Order code e.g.: FMU90 - *1***212****
(2 inputs, 1 relay, 2 outputs)
L00-FMU90xxx-15-00-00-xx-004
Order code e.g.: FMU90 - *1***131****
(1 input, 3 relays)
L00-FMU90xxx-15-00-00-xx-007
Conveyor belt
L00-FMU90xxx-15-00-00-xx-005
6 Endress+Hauser
Order code e.g.: FMU90 - *1***111****
(1 input, 1 output)
Prosonic S FMU90
FDU9x
D
Q
Prosonic S
123m
3
Q
Prosonic S
L
Q(l/s)
L (m)
Q (l/s)
Prosonic S
123m
3
Application examples for flow measurements
Pulses for volume counter + time pulses (e.g.
for sampler)
L00-FMU90xxx-15-00-00-xx-011
Order code e.g.: FMU90 - *2***131****
(1 input, 3 relays, 1 output)
Stormwater overflow bassin
Simultaneous measurement of level L and flow Q
with 1 sensor.
Flow measurement with backwater alarm or
sludge detection
If the ratio "downstream level:upstream level"
rises above or falls below a critical value, an alarm
will be generated.
L00-FMU90xxx-15-00-00-xx-008
Order code e.g.: FMU90 - *2***212****
(2 inputs, 1 relay, 2 outputs)
L00-FMU90xxx-15-00-00-xx-006
Order code e.g.: FMU90 - *2***112****
(1 input, 2 outputs)
Endress+Hauser 7
System integration HART Operating options
250 W
I : 4...20 mA + HART
1
5
4
3
1
2
7
6
PROFIBUS DP
SPS /
PLC/
API
Ethernet
PDM
...
Prosonic S
PROFIboard
PROFIcard
PROFIusb
Commubox
FXA 291
FieldCare
T
T
FieldCare
In the standard version a HART signal is superimposed onto the first output current. In order to use the
HART communication, the circuit must contain a communication resistor of 250 .
Prosonic S FMU90
System integration PROFIBUS DP
L00-FMU90xxx-14-00-00-xx-020
1 SPS, PLC, API
2 Commubox FXA195 (USB), HART-Protocol
3 FieldCare
4 Commubox FXA291 (service interface)
5 Operating and display module at the Prosonic S (if present)
6 Field Xpert SFX350/SFX370
7 VIATOR Bluetooth-Modem with connection cable
Operating options
• Via the display and operating module at the Prosonic S
• Via the service interface with the Commubox FXA291 and the operating program FieldCare
• Via PROFIBUS DP with PROFIboard, PROFIcard or PROFIusb and the operating program FieldCare
L00-FMU90xxx-14-00-00-xx-021
8 Endress+Hauser
Prosonic S FMU90
Input
Sensor inputs Depending on the instrument version, 1 or 2 of the sensors FDU90, FDU91, FDU91F, FDU92, FDU93,
FDU95 can be connected. The Prosonic S identifies these sensors automatically.
Sensor FDU90
Max. range
Max. range
m (ft)
1) This table gives the maximum range. The range depends on the measuring conditions. For an estimation
see Technical Information TI00396F, Chapter "Input".
1)
in liquids
1
in solids 1.2 (3.9) 5 (16) 10 (33) 15 (49) 45 (148)
3 (9.8) 10 (33) 20 (66) 25 (82) -
FDU91
FDU91F
In order to support existing installations, the following sensors can be connected as well.
FDU92 FDU93 FDU95
6)
The type of
sensor must be entered manually (except FDU96).
Sensor
Max. range
Max. range
m (ft)
1) This table gives the maximum range. The range depends on the measuring conditions. For an estimation
1)
in liquids
1
in solids 2 (6.6) 5 (16) 10 (33) 15 (49) 25 (82) 45 (148) 70 (230) 70 (230)
see Technical Information TI00189F, Chapter "Planning Recommendations".
FDU80
FDU80F
5 (16) 10 (33) 20 (66) 25 (82) - - - -
FDU81
FDU81F
FDU82 FDU83 FDU84 FDU85 FDU86 FDU96
The sensors FDU83, FDU84, FDU85 and FDU86 with an ATEX, FM or CSA certificate are not
certified for connection to the FMU90 transmitter.
External limit switches (option)
Optionally, the Prosonic S FMU90 has 4 inputs for external limit switches (FMU90-********B***).
Switching options
• External passive limit switch (NC/NO switch)
• 0: < 8 V; 1: > 16 V
Usage (examples)
• Pump feedback (for FMU90-*3******B*** and FMU90-*4******B***)
• Pump tariff control (for FMU90-*3******B*** and FMU90-*4******B***)
• Start/stop/reset of daily counters for flow measurements
(for FMU90-*2******B*** and FMU90-*4******B***)
• Min/max level detection, e.g. by Liquiphant
External temperature sensor Optionally, the Prosonic S FMU90 has an input for an external temperature sensor
(FMU90-********B***).
Connectable sensors
• Pt100 (3-wire or 4-wire connection)
A Pt100 with 2-wire connection may not be used due to its insufficient accuracy.
• Omnigrad S TR61 (from Endress+Hauser) ä 33, "Accessories"
Usage (example)
• Time-of-flight correction for a heated sensor (FDU90-***B*, FDU91-***B*).
6) The sensors FDU80/80F/81/81F/82/83/84/85/86/96 are not available anymore.
Use the serial number of your device to access the documentation for your device via www.endress.com.
Endress+Hauser 9
Output
Prosonic S FMU90
Analog outputs
Relay outputs
Number 1 or 2, depending on instrument version
Output signal Active current output
output values configurable at the instrument:
• 4 to 20 mA with HART
1)
• 0 to 20 mA without HART
Signal on alarm • For setting 4 to 20 mA, selectable:
–MIN: -10% (3,6mA)
– MAX: 110 % (22 mA)
– HOLD (last current value is held)
– User specific
• For setting 0 to 20 mA:
– MIN: 110 % (21,6 mA)
– HOLD (last current value is held)
– User specific
Output damping Freely selectable, 0 to 1000 s
Load Max. 600 , influence negligible
Max. ripple U
Max. noise U
= 200 mV at 47 to 125 Hz (measured at 500 )
SS
= 2,2 mV at 500 Hz to 10 kHz (measured at 500 )
eff
1) The HART signal is assigned to the first analog output. The second analog output does not carry a HART
signal.
Number 1, 3 or 6; depending on the instrument version
Type Potential-free relay, SPDT, can be inverted
Assignable functions • Limit (inband, out-of-band, trend, level limit)
• Counting pulse
• Time pulse
• Alarm/diagnosis
(e.g. indication of backwater
for flow counting (max. frequency 2 Hz; pulse width adjustable)
(max. frequency 2 Hz; pulse width adjustable)
1)
, sludge, echo loss etc.)
• Pump control (alternating/fixed limit/pump rate)
• For FMU90-*3********** and FMU90-*4**********):
additional pump control (standby pump, storm function to avoid unnecessary
run times of the pumps, pump function test, flush control to clean pump shafts,
operating hours alarm, pump alarm)
• Rake control (difference or relative measurement)
• Fieldbus relay (to be switched direclty from the PROFIBUS DP-bus)
Switching power • DC voltage: 35 V
, 100 W
DC
• AC voltage: 4 A, 250 V, 1000 VA at cos = 0,7
State on error Selectable:
• HOLD (last value is held)
•Energized
• Ee-energized
• Present value is used
Behaviour after power
Switch-on delay selectable
failure
2)
LEDs
A yellow LED on the front panel is allocated to each relay, which lights if the relay
is energized.
The LED of an alarm relay lights during normal operation.
The LED for a pulse relay briefly flashes at every pulse.
1) For instrument versions with flow software (FMU90 - *2**********)
2) For instrument versions with display and operating module
10 Endress+Hauser
Prosonic S FMU90
PROFIBUS DP interface
Profile 3.0
Transmittable values • Main value (level or flow, depending on the instrument version)
•Distances
•Counters
• Temperatures
• Average/difference/sum
• Relay states
•Rake control
•Pump control
Function blocks • 10 Analog Input Blocks (AI)
Supported baud rates • 9.6 kbaud
Service Access Points
(SAPs)
ID number 1540 (hex) 1540 (hex) = 5440 (dec)
GSD file EH3x1540.gsd
Addressing Via dip switches at the instrument or via software (e.g. FieldCare).
Termination Can be activated/deactivated in the instrument.
Locking The device can be locked by hardware or software.
• 10 Digital Input Blocks (DI)
• 10 Digital Output Blocks (DO)
• 19.2 kbaud
• 45,45 kbaud
• 93.75 kbaud
• 187.5 kbaud
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Power supply
Supply voltage / Power consumption / Current consumption
Galvanic isolation The following terminals are galvanically isolated from each other:
Fuse •2AT/DC
Endress+Hauser 11
Instrument version Supply voltage Power consumption Current consumption
AC voltage
(FMU90 - ****A****)
DC voltage
(FMU90 - ****B****)
90 to 253 V
10,5 to 32 V
(50/60 Hz) Max. 23 VA Max. 100 mA at 230 V
AC
DC
Max. 14 W (typically 8 W) Max. 580 mA at 24 V
• Auxiliary energy
• Sensor inputs
•Analog output 1
•Analog output 2
•Relay outputs
•Bus connection (PROFIBUS DP)
• 400 mA T /AC
Accessible in the terminal compartment
AC
DC
Electrical connection
1.
2.
3.
1.
2.
Prosonic S FMU90
Terminal compartment of the field housing polycarbonate
The field housing has a separate terminal compartment. It can be opened after loosening the 4 screws
of the lid.
L00-FMU90xxx-04-00-00-xx-002
For easier wiring, the lid can be completely removed by unplugging the display plug and loosening the
hinges:
Cable entries of the field housing polycarbonate
Terminal compartment of the field housing aluminium
L00-FMU90KAx-04-00-00-xx-009
On the bottom of the housing the following openings for cable entries are prestamped:
• M20x1.5 (10 openings)
• M16x1.5 (5 openings)
• M25x1.5 (1 opening)
A suitable cutting device must be used for cutting out the openings.
The field housing aluminium is wired almost the same way as the FMU90 in the DIN-rail housing
ä 13.
Pay attention to the following differences:
• In explosion-hazardous areas, all connections must be located inside the field housing aluminium.
. Exception: For potential equalization, there’s a terminal block inside the housing that is wired
to the FMU90 ex works. The terminal block is connected to the protective earth terminal, which
is accessible on the outside of the field housing aluminium.
For wiring inside the housing, the cables are routed into the housing through the cable entries in
the bottom and are connected there with either the device or a terminal block. When routing the
cables through the cable entries, use cable glands that are appropriate for the ignition protection
type!
• If the distance to the sensors is greater than 30 m (98 ft), an extension cable must be used.
12 Endress+Hauser
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