Endress+Hauser FDU93, FDU91 Specifications
TI00396F/00/EN/16.15
FDU92
FDU93
FDU95
FDU91
FDU90
FDU91F
71308097
Products Solutions Services
Technical Information
Prosonic S
FDU90/91/91F/92/93/95
Ultrasonic measurement
Time-of-Flight
Ultrasonic sensors for level and flow measurement for connection to FMU9x
Field of application
• Continuous, non-contact level measurement of fluids and
bulk material in silos, on belts, stockpiles and in crushers
• Flow measurement in open channels and at weirs
• Maximum measuring range
– FDU90: 3 m (9.8 ft) in fluids
1.2 m (3.9 ft) in bulk materials
– FDU91/FDU91F: 10 m (33 ft) in fluids
5 m (16 ft) in bulk materials
– FDU92: 20 m (66 ft) in fluids
10 m (33 ft) in bulk materials
– FDU93: 25 m (82 ft) in fluids
15 m (49 ft) in bulk materials
– FDU95: 45 m (148 ft) in bulk materials
• International explosion protection certificates
Benefits
• Integrated temperature sensor for Time-of-Flight correction.
Accurate measurements are possible, even if temperature
changes are present
• Hermetically welded PVDF sensors FDU91/92 for highest
chemical resistance
• Suited for rough ambient conditions thanks to separate
installation from the transmitter (up to 300 m (984 ft))
• Reduced build-up formation because of the self-cleaning
effect
• Weather resistant and flood-proof (IP68)
• Dust-Ex and Gas-Ex certificates available
Table of Contents
Prosonic S FDU90/91/91F/92/93/95
Safety symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Function and system design . . . . . . . . . . . . . . . . . . . . . .3
Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Time-of-flight correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Blocking distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Measuring range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Signal transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Sensor heater (for FDU91) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connection hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Extension cables for the sensors . . . . . . . . . . . . . . . . . . . . . . . . . 8
Shortening the sensor cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation options (Examples) . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation conditions for level measurements . . . . . . . . . . . . 11
Installation conditions for flow measurements . . . . . . . . . . . . 12
Flush mounting with slip-on flange FAU80 . . . . . . . . . . . . . . 13
Nozzle installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Ultrasound guide pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Certificates and Approvals. . . . . . . . . . . . . . . . . . . . . . 21
CE mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Ex approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
External standards and directives . . . . . . . . . . . . . . . . . . . . . . . 21
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5-point linearity protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Extension cable for sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Protective cover for FDU90 and FDU91 . . . . . . . . . . . . . . . . . . 23
Screw in flange FAX50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Flooding protection tube for FDU90 . . . . . . . . . . . . . . . . . . . . . 25
Cantilever with mounting frame or wall bracket . . . . . . . . . . . 26
Mounting bracket for ceiling mounting . . . . . . . . . . . . . . . . . . 28
Alignment unit FAU40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Power supply RNB130 for the FDU90/FDU91 sensor heater 30
IP66 protective housing for the power supply RNB130 . . . . . 30
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operating instructions (for transmitter FMU90) . . . . . . . . . . 30
Description of Instrument Functions (for transmitter FMU90) .
31
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Ingress protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Thermal shock resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Explosion hazardous area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Process temperature, Process pressure . . . . . . . . . . . . . . . . . . . 16
Mechanical construction . . . . . . . . . . . . . . . . . . . . . . . 17
Counter nut G 1" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Dimensions FDU90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Dimensions FDU91 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Dimensions FDU91F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Dimensions FDU92 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Dimensions FDU93 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Dimensions FDU95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connecting cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2 Endress+Hauser
Prosonic S FDU90/91/91F/92/93/95
DANGER
WARNING
CAUTION
NOTICE
100%
0%
D
L
F
E
BD
V
Q
D
1
2
2
1
Safety symbols
Symbol Meaning
A0011189-DE
A0011190-DE
A0011191-DE
A0011192-DE
DANGER!
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.
Measuring principle
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
Function and system design
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
Endress+Hauser 3
L00-FMU90xxx-15-00-08-xx-900
Prosonic S FDU90/91/91F/92/93/95
FDU91
FDU92
FDU90
0.07
(0.23)
0.3 (1.0)
0.4 (1.3)
FDU93
0.6 (2.0)
AB
FDU95
FDU95-#2###: 0.9 (3.0)
FDU95-#1###: 0.7 (2.3)
C
m (ft)
Sensor BD Maximum range
fluids
FDU90 0.07 (0.2) 3 (9.8) 1.2 (3.9)
FDU91 (F) 0.3 (1.0) 10 (33) 5 (16)
FDU92 0.4 (1.3) 20 (66) 10 (33)
FDU93 0.6 (2.0) 25 (82) 15 (49)
FDU95 (low temperature
version)
FDU95 (high temperature
version)
m (ft)
0.7 (2.3) − 45 (148)
0.9 − 45 (148)
Maximum range
bulk materials
Time-of-flight method
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
reference point (see the figure → ä 4) 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
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.
Blocking distance The level L may not extend into the blocking distance BD. Level echoes within the blocking distance
can not be evaluated due to the transient characteristics of the sensor and thus a reliable measurement
is not possible. The blocking distance BD is dependent on the type of sensor:
A: Without flooding protection tube, B: With flooding protection tube, C: Reference point of the sensor
L00-FDU9xxxx-05-00-00-xx-002
Transmitter The sensors can be connected to the transmitter FMU90 and FMU95. The transmitter recognizes the
type of sensor automatically.
4 Endress+Hauser
Prosonic S FDU90/91/91F/92/93/95
0 20 40 60 80 100
45
25
20
10
0
FDU95
FDU96
FDU93
FDU92
A[dB]
R [m]
FDU90
3
FDU91 F
50
( )
Input
Measuring range The effective range of the sensors is dependent on the operating conditions. To estimate the range,
proceed as follows (see also the example):
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 dB
large quantities 5 to 20 dB
Temperature difference between
sensor and product surface
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
Attenuation
Example for FDU91(F)
• Silo with rubble: ~ 40 dB
• Small quantities of
filling curtain: ~ 5 dB
•Little dust: ~ 5dB
Attenuation total: ~ 50 dB
Range approx. 5 m (16 ft)
L00-FDU9xxxx-05-00-00-xx-100
A: Attenuation (dB)
R: Range (m)
These measuring conditions have been taken into account during the calculation of the maximum
measuring range in solid applications.
Endress+Hauser 5
Prosonic S FDU90/91/91F/92/93/95
Operating frequency
Sensor Operating frequency
FDU90 90 kHz
FDU91 43 kHz
FDU91F 42 kHz
FDU92 30 kHz
FDU93 27 kHz
FDU95 - *1***
(low temperature version)
FDU95 - *2***
(high temperature version)
Output
Signal transmission analogue voltages
Power supply
17 kHz
18 kHz
Power supply supplied by the transmitter FMU90
Sensor heater (for FDU91) The FDU90 and FDU91 sensors are optionally available in a version with sensor heater.
The sensor heater needs an external power supply.
The power for the heater can be supplied by the power supply RNB130 from Endress+Hauser
(→ ä 30).
The power supply for the sensor heater is connected to the brown (BN) and blue (BU) strand of the
sensor cable.
Technical data
• 24 VDC ±10 %; residual ripple < 100 mV
• 250 mA per sensor
• If the sensor heater is applied, the integrated temperature sensor can not be used. Instead,
an external temperature sensor (Pt100 or FMT131 from Endress+Hauser) must be used.
• The transmitter FMU90 is available in a version with an input for the external temperature
sensor. For details refer to Technical Information TI00397F.
6 Endress+Hauser
Prosonic S FDU90/91/91F/92/93/95
YE
9
(12)
BK
10
(13)
RD
11
(14)
FDU90/91/92
BK
YE
RD
1
YE
9
(12)
BK
10
(13)
RD
11
(14)
FDU91F/93/95
BK
YE
RD
GNYE
2
3
FMU90
2
3
FMU90
YE
9
(12)
BK
10
(13)
RD
11
(14)
FDU90/91
BK
YE
RD
FMU90
BN BU
24 VDC
+
-
A
B
C
YE
9
(12)
BK
10
(13)
RD
11
(14)
FDU91F/93/95
BK
YE
RD
GNYE
FMU90
D
300 m
(984 ft)
≤
≤30 m
(98 ft)
1
300 m
(984 ft)
≤
≤30 m
(98 ft)
Electrical connection
Connection diagram
A Without sensor heater
B With sensor heater
C Grounding at the terminal box
D Grounding at the transmitter FMU90
1 Shield of the sensor cable
2Terminal box
3 Shield of the extension cable
Colours of the strands: YE = yellow; BK = black; RD = red; BU = blue; BN = brown; GNYE = green-yellow
L00-FDU9xxxx-04-00-00-xx-002
Endress+Hauser 7
Prosonic S FDU90/91/91F/92/93/95
WARNING
!
WARNING
!
Connection hints
Extension cables for the sensors
In order to avoid interference, do not route the sensor cables parallel to high-voltage or
electric power lines and not close to frequency converters.
Limitation of electrical safety.
‣ The protective conductor (GNYE) of the sensors FDU91F/93/95 must be connected to the local
potential equalization after a maximum distance of 30 m (98 ft).
The protective conductor (GNYE) of the sensors can be connected at this locations:
•Terminal box
• Transmitter FMU90
•Cabinet
The cable shield serves as a return cable and must be connected to the transmitter without
any electrical break. With the preassembled cables, the shield ends in a black strand (BK).
With the extension cable, the shield must be twisted together and connected to the "BK"
terminal. The cable shield must not be connected to the local potential equalization.
For easier mounting it is advisable to use the sensors FDU90/91/92 with a maximum cable length of
30 m (98 ft) as well. For longer distances an extension cable with a terminal box should be used.
For distances up to 30 m (98 ft) the sensor can be directly connected by the sensor cable. For longer
distances, it is recommended to use an extension cable. The extension cable is connected via a terminal
box. The total length (sensor cable + extension cable) may be up to 300 m (984 ft).
Explosion hazard!
In explosion hazardous areas, sparks can cause explosions. This may lead to serious or fatal injury.
Additionally, the device and installation may be seriously damaged.
‣ If the terminal box is installed in explosion hazardous areas, all applicable national guidelines must
be observed.
‣ Pay attention to the measures and notes in Chapter Certificates and Approvals → ä 21.
Suitable extension cables can be obtained from Endress+Hauser (→ ä 23 "Accessories")
Alternatively, cables with the following properties can be used:
• Number of cores according to the connection diagram (→ ä 7 "Connection diagram")
• Braided wire shield for the yellow (YE) and red (RD) core (no foil shield)
• Length: up to 300 m (984 ft), sensor cable + extension cable
• Cross section: 0.75 mm
2
to 2.5 mm2 (18 to 14 AWG)
•Up to 8Ω per core
• Max. 60 nF (between core and shield)
• For FDU91F/93/95: The protective conductor (GNYE) must not be within the shield.
8 Endress+Hauser
Prosonic S FDU90/91/91F/92/93/95
FDU90/91/92
FDU91F/93/95
RDBK
YE
RDBKYE
24 VDC
BN (+)
BU (-)
GNYE
BN
BU
RD
YE
GNYE
RD
YE
A
B
Shortening the sensor cable If required, the sensor cable can be shortened. Please note:
• Do not damage the cores when removing the insulation.
• The cable is shielded by a metallic braiding. This shielding serves as a return cable and corresponds
to the black (BK) strand of the unshortened cable. After shortening the cable, loosen the metallic
braiding, twist it together securely and connect it to the "BK" terminal.
The protective conductor (GNYE), which is present in some of the sensor cables, may not be
electrically connected to the cable shield.
L00-FMU90xxx-04-00-00-xx-015
Colours of the strands: YE = yellow; BK = black; RD = red; BU = blue; BN = brown; GNYE = green-yellow
The blue (BU) and brown (BN) strands is only present for sensors with heater.
Endress+Hauser 9
WARNING
!
NOTICE
Installation options
ABC
-
-
.
3
2
1
A
B
C
1
1
ABC D
41 mm
(Examples)
Prosonic S FDU90/91/91F/92/93/95
Installation
Hazard of accidents!
If sensors are not fastened properly, they can fall down and cause serious injury and property damage.
‣ Only install sensors in areas that are stable and sufficiently able to take the load.
‣ Fasten sensors only with fastening material that is proper and suited for the environment.
Risk of sensor damage.
‣ Do not use the sensor cable for suspension.
‣ Protect sensor membrane from damage during installation.
L00-FDU9xxxx-17-00-00-xx-001
1FAU40
2Zone 20
3Zone 21
A: at girder or angle bracket, B: with alignment unit FAU40, in ATEX Zone 20 the alignment unit can be used for zone separation,
C: with a 1" sleeve welded to a grating
L00-FDU9xxxx-17-00-00-xx-007
1FDU9x
A: Installation with cantilever and wall bracket, B: Installation with cantilever and mounting frame, C: The cantilever can be turned
in order to position the sensor over the centre of the flume.
Cantilever, wall bracket and mounting frame are available as accessories (
→ ä
23).
L00-FDU90xxxx-17-00-00-xx-001
A: FDU90: Ceiling mounting
B: FDU90: Mounted at front thread (G 1½" or NPT 1½" )
C: FDU9x: Mounted at rear thread (G 1" or NPT 1")
D: FDU90, FDU91, FDU92: Mounting with G 1" counter nut
1)
1) The counter nut with gasket is supplied for the sensors FDU90, FDU91 and FDU92 with a metric thread G 1" at the process connection.
10 Endress+Hauser
Loading...