Rosemount™ 5408 and 5408:SIS Level
Transmitters – Non-Contacting Radar
Read this manual before working with the product. For personal and system safety, and for optimum
product performance, make sure you thoroughly understand the contents before installing, using, or
maintaining this product.
For technical assistance, contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)
Asia Pacific- 65 777 8211
Europe / Middle East / Africa - 49 (8153) 9390
North American Response Center
Equipment service needs.
1-800-654-7768 (24 hours a day — includes Canada)
Outside of these areas, contact your local Emerson
™
representative.
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November 2017
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Reference Manual
00809-0100-4408, Rev BA
Failure to follow safe installation and service guidelines could result in death or serious injury.
Make sure the transmitter is installed by qualified personnel and in accordance with applicable code
of practice.
Use the equipment only as specified in this manual. Failure to do so may impair the protection
provided by the equipment.
For installations in hazardous locations, the transmitter must be installed according to the
Rosemount 5408 and 5408:SIS Product Certifications
(D7000002-885).
Explosions could result in death or serious injury.
Verify that the operating environment of the transmitter is consistent with the appropriate
hazardous locations certifications.
Before connecting a Field Communicator in an explosive atmosphere, make sure the instruments in
the loop are installed in accordance with intrinsically safe or non-incendive field wiring practices.
Do not remove the transmitter covers in explosive atmospheres when the circuit is alive.
Both transmitter covers must be fully engaged to meet explosion-proof requirements.
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads can cause
electrical shock.
Make sure the main power to the transmitter is off and the lines to any other external power source
are disconnected or not powered while wiring the transmitter.
Process leaks could result in death or serious injury.
Make sure that the transmitter is handled carefully. If the process seal is damaged, gas might escape
from the tank.
Any substitution of non-authorized parts or repair, other than exchanging the complete
transmitter head or antenna assembly, may jeopardize safety and is prohibited.
Unauthorized changes to the product are strictly prohibited as they may unintentionally and
unpredictably alter performance and jeopardize safety. Unauthorized changes that interfere with the
integrity of the welds or flanges, such as making additional perforations, compromise product
integrity and safety. Equipment ratings and certifications are no longer valid on any products that
have been damaged or modified without the prior written permission of Emerson. Any continued use
of product that has been damaged or modified without the written authorization is at the customer’s
sole risk and expense.
document and System Control Drawing
Hot surfaces
The flange and process seal may be hot at high process temperatures.
Allow to cool before servicing.
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Reference Manual
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The products described in this document are NOT designed for nuclear-qualified applications.
Using non-nuclear qualified products in applications that require nuclear-qualified hardware or
products may cause inaccurate readings. For information on Rosemount nuclear-qualified products,
contact your local Emerson Sales Representative.
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Section 1Introduction
1.1Using this manual
The sections in this manual provide information on installing, operating, and maintaining the
Rosemount
The sections are organized as follows:
Section 2: Transmitter Overview provides an introduction to theory of operation, a description of the
transmitter, information on typical applications, and process characteristics.
The Rosemount™ 5408 and 5408:SIS are two-wire transmitters for continuous level measurements over
a broad range of liquids, slurries, and solids. The measurement principle is fast-sweep Frequency
Modulated Continuous Wave (FMCW).
Transmitter Overview
November 2017
The transmitter continuously emits signal sweeps with a constantly varying frequency towards the
product surface. Since the transmitter continuously changes the frequency of the transmitted signal,
there will be a difference in frequency between the transmitted and the reflected signals (see
Figure 2-1).
The frequency of the reflected signal is subtracted from the frequency of the signal transmitted at that
moment, resulting in a low frequency signal which is proportional to the distance to the product surface.
This signal is further processed to obtain fast, reliable, and highly accurate level measurements. See
Figure 2-2 for a schematic overview of the signal processing.
Figure 2-1. FMCW-method
f
max
f
in
f
f
out
f
min
t
f d=Distance
d
f
f
in
out
Tra nsm itter Overview
3
Transmitter Overview
Microwave module
A/D converter
Fast Fourier transform (FFT)
Peak search
Peak interpolation
Echo tracker
Echo identifier
Distance filtering
Variable calculation
Aout handlerLCD handlerHART
®
November 2017
Figure 2-2. Flowchart of the Signal Processing
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2.2Process characteristics
2.2.1Dielectric constant
A key parameter for measurement performance is reflectivity. A high dielectric constant of the media
provides better reflection and enables a longer measuring range.
2.2.2Foam and turbulence
Foaming liquids or turbulence may cause weak and varying surface echo amplitudes. The effects of
turbulence are usually minor, but in the most challenging conditions, the transmitter may be mounted in
a still pipe. In addition, measurement performance can be optimized by configuring the appropriate
process conditions settings, see “Process conditions” on page 196.
Measurement in foamy applications depends largely on the foam properties. When the foam is light and
airy, the actual product level is measured. For heavy and dense foam, the transmitter may measure the
level of the foam’s upper surface.The Double Surface Handling function allows the user to select if the
foam layer or product surface should be used as output (see “Double surface handling” on page 201).
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2.2.3Condensation
Generally, the radar signal is unaffected by condensation and low pressure steam. However, heavy
condensation can affect the measurement. In such applications, air purging may be required to prevent
clogging of the antenna.
In high temperature applications, it is recommended to insulate the tank nozzle. Insulation prevents the
nozzle from becoming a cold spot, and thus reduces the amount of water build up and condensation on
the antenna.
If the temperature in the tank is much higher than the ambient temperature (i.e. tank is heated and
located in a cold area), it might be necessary to heat trace the nozzle in addition to the insulation.
2.2.4Dust
Dust is often present in solids applications, and even if the non-contacting radar is not affected by the
dust in the vapor space, dust can be sticky and create a layer on the antenna. If this layer becomes too
thick, it may affect the measurement. This is best managed by using air purging.
2.2.5Solid surface
Transmitter Overview
November 2017
Solids have some common characteristics which may cause weak and varying surface reflections. The
surface is rarely flat or horizontal, the angle of the sloping surface differs during filling and emptying, and
the dielectric constant of many solids is fairly low. Tab l e 2- 1 presents common characteristics of some
solids applications.
The parabolic antenna is ideal for applications with weak surface reflections. A larger diameter
concentrates the radar beam and ensures maximum antenna gain. The parabolic antenna comes with a
swivel connection that adjusts for angled tank roofs.
Table 2-1. Common Characteristics of Solids Applications
ApplicationsCommon characteristics
Particle sizeVapor space
Dust or
powder
Wood chip binsYesYe sYesYesPossible
Grain silo - small kernel grainsYesYe sNoYe sNo
Grain silo - large kernel grainsNoYesNoNoNo
Lime stone siloNoYesYe sPossibleNo
Cement - raw mill siloYesYe sNoYe sNo
Cement - finished product siloYesYe sNoYe sNo
Coal binYesYe sYesYesYes
Small
(<1 in.)
Larger
(>1 in.)
Dust
Steam or
condensation
Tra nsm itter Overview
Saw dustYesYe sNoYe sNo
High consistency - pulp stockNoNoNoNoYe s
AluminaYesYe sNoYe sNo
SaltNoYesYe sNoNo
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Transmitter Overview
November 2017
2.3Vessel characteristics
2.3.1In-tank obstructions
The transmitter should be mounted so that objects such as heating coils, ladders, and agitators are not in
the radar signal path. These objects may cause false echoes resulting in reduced measurement
performance. However, the transmitter has built-in functions designed to reduce the influence from
disturbing objects where such objects cannot be totally avoided.
Vertical and inclined structures cause minimal effect since the radar signal is scattered rather than
directed back to the antenna.
2.3.2Tank shape
The shape of the tank bottom affects the measurement signal when the product surface is close to the
tank bottom. The transmitter has built-in functions which optimize measurement performance for
various bottom shapes.
2.4Application examples
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The Rosemount 5408 and 5408:SIS are ideal for level measurements over a broad range of liquid and
solids applications. The transmitters are virtually unaffected by changing density, temperature, pressure,
media dielectric, pH, and viscosity. Non-contacting radar level is ideal for harsh conditions such as
corrosive and sticky media, or when internal tank obstructions are a limiting factor.
Storage and buffer tanks
The Rosemount 5408 provides accurate and reliable level measurement for both metallic or non-metallic
vessels containing almost any liquid (e.g. oil, gas condensate, water, chemicals).
Reactors
The Rosemount 5408 is ideal for the most challenging applications, including reactors where there can
be agitation, foaming, condensation as well as high temperatures and pressures.
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Blenders and mixers
The Rosemount 5408 can help you withstand the rigors of blenders and mixing tanks. Easy to install and
commission, it is also unaffected by virtually any fluid property change.
Open atmospheric applications
The Rosemount 5408 measures reliably in open applications, from short range sumps or ponds to long
range dams.
Transmitter Overview
November 2017
Still pipe and chamber installations
The Rosemount 5408 is an excellent choice for level measurement in tanks with still pipes. It may also be
used in chambers, but guided wave radar is generally the best fit for these applications. See “Still
pipe/chamber installations” on page 19 for installation guidelines.
Tra nsm itter Overview
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Transmitter Overview
SI
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2
November 2017
Bulk solids
The Rosemount 5408 is the ideal solution for small to medium sized silos with rapid level changes. The
narrow beam avoids internal obstructions while still keeping good level measurement.
Safety applications
The Rosemount 5408:SIS is the ideal choice for safety functions such as overfill prevention, level
deviation monitoring or dry-run prevention.
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2.5Components of the transmitter
Figure 2-3 shows the different components of the transmitter. There are different antenna types and
sizes available for various applications.
Figure 2-3. Components
Transmitter Overview
November 2017
A
B
C
D
E
F
L
G
G
H
I
J
K
N
P
Tra nsm itter Overview
M
Terminal compartment
A.
Transmitter housing (aluminum or stainless steel)
B.
Sensor module with signal processing electronics
C.
External ground screw
D.
Flanged process connection
E.
Cone antenna
F.
Two cable/conduit entries
G.
(½-14 NPT, M20 x 1.5, or G½)
Optional adapters: eurofast
®
and minifast
O
±15°
LCD display (optional)
H.
Alignment marker (one per side)
I.
Threaded process connection (NPT or BSPP (G))
J.
Air purge ring (option code PC1 for cone antenna)
K.
Integrated air purge connection
L.
Parabolic antenna
M.
Parabolic antenna with swivel mount
N.
Process seal antenna
®
O.
Tri Clamp process connection
P.
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Transmitter Overview
ABC
D
F
G
H
I
E
November 2017
2.6System integration
The transmitter is loop-powered, and uses the same two wires for power supply and output signal. The
output is a 4-20 mA analog signal superimposed with a digital HART signal. The transmitter can be
configured for either HART Revision 6 (default) or 7 (option code HR7). The HART Revision can be
switched in field.
By using the optional Rosemount 333 HART Tri-Loop
three additional 4-20 mA analog signals. With the HART protocol, multidrop configuration is possible. In
this case, communication is restricted to digital, since current is fixed to the 4 mA minimum value.
The transmitter can be combined with the Emerson
communicate HART data with IEC 62591 (WirelessHART
be connected to a Rosemount 751 Field Signal Indicator, or it can be equipped with an LCD display.
Reference Manual
00809-0100-4408, Rev BA
™
, the digital HART signal can be converted into
™
Wireless 775 THUM™ Adapter to wirelessly
®
) technology. In addition, the transmitter can
The transmitter can easily be configured by using a PC with the Rosemount Radar Master Plus software
(running in the Instrument Inspector
™
Application), a Field Communicator, the AMS Device Manager, or
any other Device Descriptor (DD) or Field Device Integration (FDI) compatible host system.
The Rosemount 5408 and 5408:SIS are compliant with NAMUR NE 107 Field Diagnostics for standardized
device diagnostic information.
Figure 2-4. System Architecture
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Emerson Wireless 775 THUM Adapter
A.
Rosemount 5408
B.
Rosemount 751
C.
Field Communicator
D.
Approved IS barrier (for Intrinsically Safe installations only)
Procedures and instructions in this section may require special precautions to ensure the safety of the
personnel performing the operation. Information that raises potential safety issues is indicated by a
warning symbol (). Refer to the following safety messages before performing an operation preceded
by this symbol.
Mechanical Installation
November 2017
Failure to follow safe installation and service guidelines could result in death or serious injury.
Make sure the transmitter is installed by qualified personnel and in accordance with applicable code
of practice.
Use the equipment only as specified in this manual. Failure to do so may impair the protection
provided by the equipment.
For installations in hazardous locations, the transmitter must be installed according to the
Rosemount 5408 and 5408:SIS Product Certifications
(D7000002-885).
Process leaks could result in death or serious injury.
Make sure that the transmitter is handled carefully. If the process seal is damaged, gas might escape
from the tank.
Explosions could result in death or serious injury.
Verify that the operating environment of the transmitter is consistent with the appropriate
hazardous locations certifications.
document and System Control Drawing
Mechanical Installation
11
Mechanical Installation
November 2017
3.2Confirm approval type
For hazardous locations transmitters labeled with multiple approval types:
Permanently mark the checkbox of the selected approval type(s).
Figure 3-1. Label with Multiple Approval Types
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3.3Review mounting considerations
Before installing the transmitter, consider recommendations for mounting position, sufficient free
space, nozzle requirements, etc.
3.3.1Mounting position
When finding an appropriate location on the tank for the transmitter, the conditions of the tank must be
carefully considered.
Consider the following guidelines when mounting the transmitter:
For optimal performance, the transmitter should be installed in locations with a clear and
unobstructed view of the product surface.
The transmitter should be mounted with as few internal structures as possible within the signal beam,
see “Beam width and beam angle” on page 15.
Do not install the transmitter in the center of the tank.
Do not mount close to or above the inlet stream.
Multiple Rosemount
interfering with each other.
™
5408 and 5408:SIS Level Transmitters can be used in the same tank without
12
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L
L
B
A
00809-0100-4408, Rev BA
Figure 3-2. Recommended Mounting Position
Mechanical Installation
November 2017
3.3.2Free space requirements
If the transmitter is mounted close to a wall or other tank obstructions such as heating coils and ladders,
noise might appear in the measurement signal. Therefore the following minimum clearance, according
to Ta b le 3 - 1 , must be maintained.
For easy access to the transmitter, mount it with sufficient service space (see Ta bl e 3 - 2).
Figure 3-3. Free Space Requirements
Mechanical Installation
Table 3-1. Distance to Tank Wall (L)
ApplicationMinimumRecommended
Liquids8 in. (200 mm)
Solids8 in. (200 mm)
1
/2 of tank radius
2
/3 of tank radius
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Mechanical Installation
90°
Max. 3°Max. 1.5°
90°
Cone antenna/
process seal antenna
Parabolic antenna
November 2017
Table 3-2. Free Space Requirements
DescriptionDistance
Service space width (A)20 in. (500 mm)
Service space height (B)24 in. (600 mm)
3.3.3Antenna size
Choose as large antenna diameter as possible. A larger antenna diameter concentrates the radar beam
and ensures maximum antenna gain. Increased antenna gain permits greater margin for weak surface
echoes.
In addition, a larger antenna diameter results in a smaller beam angle and thereby, less interference from
any internal structures in the tank.
3.3.4Antenna inclination
Ensure the antenna is aligned perpendicular to the product surface (see Figure 3-4). The parabolic
antenna comes with a swivel connection that adjusts for angled tank roofs.
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Note that if the surface echo is weak in solids applications, then a small inclination of the parabolic
antenna toward the surface slope may improve the performance.
Figure 3-4. Inclination
3.3.5Non-metallic tanks
The walls in non-metallic tanks can be invisible to the radar signal, so nearby objects outside the tank
may cause disturbing radar echoes. Wherever possible, the transmitter should be positioned so that
14
objects close to the tank are kept outside the signal beam.
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3.3.6Beam width and beam angle
The transmitter should be mounted with as few internal structures as possible within the signal beam.
Refer to Ta b le 3 - 3 for beam angle and Tab l e 3 -4 for beam width at different distances.
Figure 3-5. Beam Angle and Beam Width
Mechanical Installation
November 2017
Table 3-3. Beam Angle
Antenna sizeBeam angle (α)
2-in. (DN50) cone/process seal18°
3-in. (DN80) cone/process seal14°
4-in. (DN100) cone/process seal10°
8-in. (DN200) parabolic4.5°
Table 3-4. Beam Width, ft. (m)
Distance (D)Beam width (W)
2-in. cone/
process seal
16 (5)5.2 (1.6)4.0 (1.2)2.9 (0.9)1.3 (0.4)
33 (10)10.4 (3.2)8.1 (2.5)5.7 (1.8)2.6 (0.8)
49 (15)15.6 (4.8)12.1 (3.7)8.6 (2.6)3.9 (1.2)
66 (20)20.8 (6.3)16.1 (4.9)11.5 (3.5)5.2 (1.6)
82 (25)26.0 (7.9)20.1 (6.1)14.3 (4.4)6.4 (2.0)
98 (30)31.2 (9.5)24.2 (7.4)17.2 (5.3)7.7 (2.4)
131 (40)41.6 (12.7)32.2 (9.8)23.0 (7.0)10.3 (3.1)
3-in. cone/
process seal
4-in. cone/
process seal
Parabolic
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D
H
> 0.4 in. (10 mm)
November 2017
3.3.7Nozzle requirements
In order to allow the microwaves to propagate undisturbed, the nozzle dimensions should be kept within
the specified limits as given in Ta bl e 3 - 5, Tab l e 3 -6 , and Ta b le 3- 7 .
Cone antenna
For best performance, the cone antenna should extend at least 0.4 in. (10 mm) below the nozzle. If
required, use the extended cone antenna versions (option code S1 or S2).
However, the antenna can be recessed in smooth nozzles up to 4 ft. (1.2 m). Note that if the inside of the
nozzle has irregularities (e.g. due to bad welding, rust, or deposit), then use the extend cone antenna.
Figure 3-6. Mounting of the Cone Antenna
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16
Table 3-5. Nozzle Requirements for Cone Antenna, in Inches (Millimeters)
Antenna sizeMinimum nozzle
diameter (D)
(1)
Recommended maximum nozzle height (H)
(2)(3)
AntennaAntenna with air purge ring
(code PC1)
2-in. (DN50)1.94 (49.3)5.71 (145)4.69 (119)
3-in. (DN80)2.80 (71.0)5.63 (143)4.61 (117)
4-in. (DN100)3.78 (96.0)6.54 (166)5.51 (140)
1. The antennas are sized to fit within schedule 80 or lower schedules.
2. The values are valid for cone antennas without antenna extension.
3. For liquid applications, the cone antenna can be recessed in smooth nozzles up to 4 ft. (1.2 m), but note that the accuracy may be reduced
in the region close to the nozzle.
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Process seal antenna
The antenna can be used on nozzles up to 4 ft. (1.2 m). Disturbing objects inside the nozzle may impact
the measurement, and should therefore be avoided.
Figure 3-7. Mounting of the Process Seal Antenna
Mechanical Installation
November 2017
Table 3-6. Nozzle Requirements for Process Seal Antenna
Antenna sizeMinimum nozzle diameter (D)
2-in. (DN50)1.77 in. (45 mm)4 ft. (1.2 m)
3-in. (DN80)2.76 in. (70 mm)4 ft. (1.2 m)
4-in. (DN100)2.76 in. (70 mm)4 ft. (1.2 m)
1. The antennas are sized to fit within schedule 120 or lower schedules.
(1)
Recommended maximum nozzle height (H)
Mechanical Installation
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Mechanical Installation
α
H
Ø
8
i
n
.
(
2
0
0
m
m
)
D
Nozzle mountingFlange mounting in manhole cover
α
H
November 2017
Parabolic antenna
See Ta bl e 3 - 7 for nozzle height recommendations at different inclination angle.
Figure 3-8. Mounting of the Parabolic Antenna
Table 3-7. Nozzle Requirements for Parabolic Antenna, in Inches (Millimeters)