Siemens Sitrans Probe LR User manual

Operating Instructions 01/2011
SITRANS
Radar Transmitters
SITRANS Probe LR

© Siemens AG 2011
Safety Guidelines: Warning notices must be observed to ensure personal safety as well as that of
others, and to protect the product and the connected equipment. These warning notices are
accompanied by a clarification of the level of caution to be observed.
Qualified Personnel: This device/system may only be set up and operated in conjunction with this
manual. Qualified personnel are only authorized to install and operate this equipment in accordance with
established safety practices and standards.
Unit Repair and Excluded Liability:
•The user is responsible for all changes and repairs made to the device by the user or the user’s
agent.
•All new components are to be provided by Siemens Milltronics Process Instruments.
•Restrict repair to faulty components only.
•Do not reuse faulty components.
Warning: Cardboard shipping package provides limited humidity and moisture protection. This product
can only function properly and safely if it is correctly transported, stored, installed, set up, operated, and
maintained.
This product is intended for use in industrial areas. Operation of this equipment in a residential area
may cause interference to several frequency based communications.
Note: Always use product in accordance with specifications.
Copyright Siemens AG 2011. All Rights
Reserved
Disclaimer of Liability
This document is available in bound version and in
electronic version. We encourage users to purchase
authorized bound manuals, or to view electronic
versions as designed and authored by Siemens
Milltronics Process Instruments. Siemens Milltronics
Process Instruments will not be responsible for the
contents of partial or whole reproductions of either
bound or electronic versions.
While we have verified the contents of this
manual for agreement with the
instrumentation described, variations remain
possible. Thus we cannot guarantee full
agreement. The contents of this manual are
regularly reviewed and corrections are
included in subsequent editions. We welcome
all suggestions for improvement.
Technical data subject to change.
MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments.
Contact SMPI Technical Publications European Authorized Representative
at the following address:
Technical Publications Siemens AG
Siemens AG Industry Sector
Siemens Milltronics Process Instruments 76181 Karlsruhe
1954 Technology Drive, P.O. Box 4225 Deutschland
Peterborough, Ontario, Canada, K9J 7B1
Email: [e-mail]
•For a selection of Siemens Milltronics level measurement manuals, go to:
www. siemens.com/processautomation. Under Process Instrumentation, select
Level
Measurement
and then go to the manual archive listed under the product family.
•For a selection of Siemens Milltronics weighing manuals, go to:
www. siemens.com/processautomation. Under Weighing Technology, select
Continuous
Weighing Systems
and then go to the manual archive listed under the product family.

i
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Table of Contents
Table of Contents
Safety Notes ...........................................................................................................................................1
Safety marking symbols ............................................................................................................1
The Manual ............................................................................................................................................1
Application Examples .................................................................................................................2
Support ..........................................................................................................................................2
Abbreviations and Identifications ...........................................................................................2
SITRANS Probe LR ............................................................................................................4
Applications ..................................................................................................................................4
SITRANS Probe LR System Implementation ........................................................................5
Programming ................................................................................................................................5
SITRANS Probe LR Approvals and Certificates ..................................................................5
Specifications ....................................................................................................................7
SITRANS Probe LR ............................................................................................................................... 7
Power............................................................................................................................................. 7
Performance................................................................................................................................. 7
Interface ........................................................................................................................................ 8
Programmer (infrared keypad) ................................................................................................ 8
Mechanical................................................................................................................................... 9
Environmental .............................................................................................................................. 9
Process........................................................................................................................................ 10
Approvals (verify against device nameplate)..................................................................... 10
Installation ..................................................................................................................................................11
Mounting location ...............................................................................................................................12
Location on a nozzle, or on a manhole cover ....................................................................14
Mounting Instructions .......................................................................................................................14
SITRANS Probe LR: Dimensions ...........................................................................................15
Wiring ................................................................................................................................16
Power ...........................................................................................................................................16
Connecting SITRANS Probe LR .......................................................................................................16
Operating SITRANS Probe LR .......................................................................................18
RUN Mode ..................................................................................................................................18
Display ......................................................................................................................................... 18
PROGRAM Mode ......................................................................................................................19
Programming.............................................................................................................................. 19
Display ......................................................................................................................................... 19
Low temperature effects on RUN/PROGRAM modes ......................................................20
Security ........................................................................................................................................21
Handheld programmer .............................................................................................................21
Activating SITRANS Probe LR .........................................................................................................22
Accessing a parameter ...........................................................................................................22
Changing a Parameter Value .................................................................................................23
Using Units or Percent (%) ..................................................................................................... 24

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Table of Contents
Quick Setup for local operation (outline) ......................................................................................24
Setup Instructions .....................................................................................................................24
Additional Settings .............................................................................................................................29
Application Examples ....................................................................................................30
Example 1: Liquid resin in storage vessel, level measurement .....................................30
Example 2: Horizontal vessel with volume measurement ...............................................32
Parameter Reference ....................................................................................................35
Helpful Hints ............................................................................................................................... 35
To access a parameter and change a value (primary index): ....................................... 35
To access a secondary index and change a value: ......................................................... 36
Quick Start (P001 to P010)................................................................................................................. 38
Volume (P050 to P055)........................................................................................................................ 42
Lock (P069)............................................................................................................................................ 47
Failsafe (P070 to P073) ....................................................................................................................... 47
mA Output (P201 to P215).................................................................................................................. 48
Installation Records (P341 to P346) ................................................................................................ 52
Range Calibration (P652 to P655) .................................................................................................... 53
Rate (P700 and P701).......................................................................................................................... 55
Measurement Verification (P709 to P713) ................................................................................... 56
Communications (P799) ..................................................................................................................... 59
Echo Processing (P800 to P807) ...................................................................................................... 59
Algorithm (P820) .................................................................................................................................. 62
TVT (Time Varying Threshold) Adjustment Parameters (P831 to P839) ............................... 63
Test (P900 to P924) ............................................................................................................................. 66
Measurement ...................................................................................................................................... 67

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Table of Contents
Appendix A: Alphabetical Parameter List .................................................................69
Appendix B: Programming Chart ..................................................................................72
Appendix C: HART ...........................................................................................................75
HART Communications for SITRANS Probe LR ...........................................................................75
HART Electronic Device Description (EDD) .................................................................................75
HART Communicator 275/375: ................................................................................................76
SIMATIC Process Device Manager (PDM) ..................................................................................79
Maintenance settings (accessible via PDM only) ............................................................79
HART Version .......................................................................................................................................80
Burst mode .................................................................................................................................80
Appendix D: Troubleshooting .......................................................................................81
Communication Troubleshooting ....................................................................................................81
Generally: ....................................................................................................................................81
Specifically: .................................................................................................................................81
General Fault Codes ...........................................................................................................................82
Fault Codes (Firmware Revision 3.02 or higher) ..........................................................................82
Fault Codes (Firmware Revision 1.05 or earlier) ..........................................................................85
Operation Troubleshooting ...............................................................................................................88
Maintenance ....................................................................................................................91
Unit Repair and Excluded Liability ..................................................................................................91
Appendix E: Technical Reference ................................................................................92
Principles of Operation ......................................................................................................................92
Transceiver ...........................................................................................................................................92
Typical Receiver Signal ........................................................................................................... 93
Near Blanking ............................................................................................................................93
Loss of Echo (LOE) ..............................................................................................................................93
Range Extension ........................................................................................................................94
False-Echo Suppression ...................................................................................................................94
TVT (Time Varying Threshold) curves ............................................................................................94
Auto False-Echo Suppression ................................................................................................94
RUN/PROGRAM ..................................................................................................................................96
Output ...........................................................................................................................................96
Failsafe ..................................................................................................................................................97
Chemical compatibility .......................................................................................................................97
Appendix F: Special Applications ................................................................................98
Application Example: Stilling-well .........................................................................................98
Appendix G: hazardous area installations ...............................................................100
Wiring Details ....................................................................................................................................100
Intrinsically Safe Model .........................................................................................................100
FM/CSA ......................................................................................................................................101
EU Equivalency ....................................................................................................................... 101
Loop Voltage versus Loop Resistance ...............................................................................102
IS Safety Barrier Selection ...................................................................................................102
How to select a passive barrier for SITRANS Probe LR .............................................. 102
PLC Input Modules................................................................................................................. 103
Passive Shunt Diode Barriers ............................................................................................ 103
Active barriers (repeating barriers)................................................................................... 103

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Table of Contents
Instructions specific to hazardous area installations ..............................................................104
(Reference European ATEX Directive 94/9/EC, ................................................................104
Annex II, 1/0/6) .........................................................................................................................104
Product Nameplate ..........................................................................................................................105
Intrinsically safe connection drawing (FM) ................................................................................106
Intrinsically safe connection drawing (CSA) ..............................................................................107
Non-incendive connection drawing (FM) ...................................................................................108
Appendix H: Firmware Revision History ...................................................................109
Glossary ..........................................................................................................................111
Index ................................................................................................................................115

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 1
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SITRANS Probe LR
Safety Notes1
Special attention must be paid to warnings and notes highlighted from the rest of the text
by grey boxes.
Safety marking symbols
The Manual
This manual will help you set up your SITRANS Probe LR for optimum performance. We
always welcome suggestions and comments about manual content, design, and
accessibility.
Please direct your comments to te[email protected]. For other Siemens level
measurement manuals, go to www.siemens.com/level, and look under Level
Measurement.
1. This symbol is used when there is no corresponding symbol on the product.
WARNING: relates to a caution symbol on the product, and means
that failure to observe the necessary precautions can result in death,
serious injury, and/or considerable material damage.
WARNING1: means that failure to observe the necessary
precautions can result in death, serious injury, and/or considerable
material damage.
Note: means important information about the product or that part of the operating
manual.
In manual: On product: Description
Earth (ground) Terminal
(Label on product: yellow background.) WARNING: refer
to accompanying documents (manual) for details.
Notes:
• Please follow the installation and operating procedures for a quick, trouble-free
installation and to ensure the maximum accuracy and reliability of your
SITRANS Probe LR.
• This manual applies to the SITRANS Probe LR only.
• This product is intended for use in industrial areas. Operation of this equipment in a
residential area may cause interference to several frequency based
communications.

Page 2 SITRANS Probe LR – INSTRUCTION MANUAL 7ML19985HR02
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SITRANS Probe LR
Application Examples
The application examples used in this manual illustrate typical installations using
SITRANS Probe LR. Because there is often a range of ways to approach an application,
other configurations may also apply.
In all examples, substitute your own application details. If the examples do not apply to
your application, check the applicable parameter reference for the available options.
Standard applications are found in the main body of the manual: for more specialized
applications, please see
Appendix F: Special Applications , page 98.
Support
If you have questions you can access our 24-hour hotline at:
www.siemens.com/automation/support-request.
Phone: [phone]
Abbreviations and Identifications
WARNING: Changes or modifications not expressly approved by
Siemens could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference,
in which case the user will be required to correct the interference at his own expense.
Short
form Long Form Description Units
A/D Analog to digital
CE / FM /
CSA
Conformitè Europèene / Factory
Mutual / Canadian Standards
Association
safety approval
CiInternal capacitance
D/A Digital to analog
DAC Digital Analog Converter
DCS Distributed Control System control room apparatus

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 3
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SITRANS Probe LR
FV Full Vacuum
ESD Electrostatic Discharge
HART Highway Addressable Remote
Transducer
IiInput current mA
IoOutput current mA
IS Intrinsically Safe safety approval
LiInternal inductance mH
LRV Lower Range Value value for process empty level 4 mAa
LSL Lower Sensor Limit below which no PV is
anticipated
mH MilliHenry 10-3 Henry
μF MicroFarad 10-6 Farad
μsMicrosecond 10-6 Second
PBT Polybutylene terephthalate
PED Pressure Equipment Directive safety approval
PEI Polyether Imide
pF Pico Farads 10-12 Farad
ppm Parts per Million
PV Primary Variable measured value
SELV Safety Extra Low Voltage
SV Secondary Variable equivalent value
TV Transmitter Variable
TVT Time Varying Threshold sensitivity threshold
UiInput voltage V
UoOutput voltage V
URV Upper Range Value value for process full level 20 mAa
USL Upper Sensor Limit above which no PV is
anticipated
a. 100% is most commonly set to 20 mA, and 0% to 4 mA: however, the settings
can be reversed.
Short
form Long Form Description Units

Page 4 SITRANS Probe LR – INSTRUCTION MANUAL 7ML19985HR02
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SITRANS Probe LR
SITRANS Probe LR
SITRANS Probe LR is a 2-wire loop-powered, continuous level measuring instrument that
utilizes advanced pulse radar technology at 5.8 GHz (6.3 GHz in North America). The
instrument consists of an electronic component coupled to the antenna and process
connection. It is very easy to install and set up, using either the infrared handheld
programmer locally, or using SIMATIC1PDM from a remote location.
Communication is via HART2. Signals are processed using Sonic Intelligence® which has
been field-proven in over 500,000 applications worldwide (ultrasonic and radar).
SITRANS Probe LR is available in two versions
• General Purpose (non-hazardous)
• Intrinsically Safe (with suitable barrier)
Applications
SITRANS Probe LR is designed to measure liquid levels in a variety of applications:
• liquid bulk storage vessels
• simple process vessels with gentle agitation
• liquids
• slurries
1. SIMATIC®is a registered trademark of Siemens AG.
2. HART® is a registered trademark of the HART Communication Foundation.
Notes:
• Please refer to product label for approval information.
• SITRANS Probe LR is to be used only in the manner outlined in this manual,
otherwise protection provided by the equipment may be impaired.
shield length: 100 mm (4"):
use for nozzles of 100 mm (4") or less
in length
shield length 250 mm (10"):
use for long nozzles of 250 mm (10")
or less in length

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 5
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SITRANS Probe LR
SITRANS Probe LR System Implementation
SITRANS Probe LR1supports HART2communication protocol and SIMATIC PDM
software.
Programming
SITRANS Probe LR carries out its level measurement function according to the set of
built-in parameters. You can make parameter changes via the handheld programmer, via
a PC using SIMATIC PDM, or via a HART Handheld Communicator.
SITRANS Probe LR Approvals and Certificates
1. Depending on the system design, the power supply may be separate from the
PLC, or integral to it.
2. A 250 Ohm resistor may be required if the loop resistance is less than 250 Ohms.
Note: Please see Approvals (verify against device nameplate) on page 10 for an
approvals listing.
active PLC
HART modem
SITRANS
Probe LR
power supply1
Typical PLC/mA configuration with HART
R2= 250 Ω
HART
communicator

Page 6 SITRANS Probe LR – INSTRUCTION MANUAL 7ML19985HR02
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SITRANS Probe LR
Notes

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 7
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Specifications
Specifications
SITRANS Probe LR
Power
• Maximum 30 V DC
• 4 to 20 mA
Performance
Reference operating conditions according to IEC 60770-1
• ambient temperature +15 to +25 oC (+59 to +77 oF)
• humidity 45% to 75% relative humidity
• ambient pressure 860 to 1060 mbar g (86000 to 106000 N/m2 g)
Measurement Accuracy (measured in accordance with IEC 60770-1)
• non-linearity (accuracy) the greater of: 10 mm (0.4"), or 0.10% of Span
(including hysteresis and non-repeatability)
• non-repeatability 5 mm (included in non-linearity specification)
• deadband (resolution) 5 mm (included in non-linearity specification)
Analog Output Accuracy (measured in accordance with IEC 60770-1)
• non-linearity (accuracy) 0.125% of Span (including hysteresis and non-
repeatability)
• non-repeatability 0.025% of Span (included in non-linearity
specification)
• deadband (resolution) 0.0375% of Span (included in non-linearity
specification)
Notes:
• Siemens makes every attempt to ensure the accuracy of these specifications but
reserves the right to change them at any time.
• Please check the ambient and operating temperatures under
Enclosure on page 9,
and Approvals (verify against device nameplate) on page 10; also check Approvals
(verify against device nameplate)
on page 10, for the specific configuration you are
about to use or install.
Nominal 24 V DC at
max. 550 Ohm.
For other configurations, see the chart Loop Voltage
versus Loop Resistance on page 102.

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Specifications
Frequency 5.8 GHz (6.3 GHz in N. America): refer to product
nameplate for confirmation
Max. measurement range1) 20 m (65 ft)
Update time mA output and loop display is updated once per
second
Minimum detectable distance1)2) 0.3 m (1 ft), plus the shield length (if any)
Influence of ambient temperature 0.003% / K
Dielectric constant εr> 3 (for < 3 use waveguide antenna or stillpipe)
Memory:
• non-volatile EEPROM
• no battery required.
Interface
•HART
• configuration: Siemens SIMATIC PDM (PC), or
HART handheld communicator, or
Siemens infrared handheld programmer
• analog output: 4 to 20 mA, ± 0.02 mA accuracy
• display (local): multi-segment alphanumeric liquid crystal with bar graph
(representing level)
Programmer (infrared keypad)
Siemens Milltronics Infrared IS (Intrinsically Safe) Handheld Programmer for hazardous
and all other locations (battery is non-replaceable)
• approval: ATEX II 1 G, EEx ia IIC T4, certificate SIRA 01ATEX2147
FM/CSA Class 1, Div. 1, Groups A, B, C, D
• ambient temperature: −20 to +40 °C (−5 to +104 °F)
• interface: proprietary infrared pulse signal
• power: 3 V lithium battery
• weight: 150 g (0.3 lb)
•color: black
1. Referenced from the sensor reference point.
2. See 'Near Blanking' on page 93 for more details.

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 9
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Specifications
Mechanical
Process Connections:
• threaded connection 1.5” NPT, BSP, or G (BS EN ISO 228-1)
Antenna:
• polypropylene rod hermetically sealed construction
standard 100 mm (4") shield for maximum 100 mm (4") nozzle,
or optional 250 mm (10") long shield
Enclosure
• body construction PBT (polybutylene terephthalate)
• lid construction hard-coated PEI (polyether imide)
• conduit entry 2 x M20x1.5 (plastic strain relief) or 2 x 1/2" NPT thread
• ingress protection Type 4X / NEMA 4X, Type 6 / NEMA 6, IP67, IP68 (see note
below)
Weight:
• standard model11.97 kg (4.35 lb.)
Environmental
• location: indoor/ outdoor
• altitude: 5000 m (16,404 ft) max.
• ambient temperature: −40 to +80 °C (−40 to +176 °F)
• relative humidity: suitable for outdoor
Type 4X / NEMA 4X, Type 6 / NEMA 6, IP67, IP68 enclosure
(see note below)
• installation category: I
• pollution degree: 4
Notes:
• Please check the ambient and operating temperatures under Enclosure on this page,
and
Approvals (verify against device nameplate) on page 10; also check Approvals
(verify against device nameplate)
on page 10, for the specific configuration you are
about to use or install.
• The use of approved watertight conduit hubs/glands is required for Type 4X /
NEMA 4X, Type 6 / NEMA 6, IP67, IP68 (outdoor applications).
1. Unit with 100 mm (4") rod and adaptors

Page 10 SITRANS Probe LR – INSTRUCTION MANUAL 7ML19985HR02
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Specifications
Process
•temperature: −40 to +80 °C (−40 to +176 °F).
(at process connection)
• pressure (vessel): maximum 3 bar, gauge (43.5 psi, gauge)
Approvals (verify against device nameplate)
•General CSA
US/C, FM, CE, C-TICK
• Radio Europe (R&TTE), FCC, Industry Canada
• Hazardous Intrinsically Safe: (Europe) ATEX II 1 G, EEx ia IIC T4
(US/Canada) FM/CSA: (barrier required)1
Class I, Div. 1, Groups A, B, C, D
Class II, Div. 1, Groups E, F, G
Class III T4
(Australia) ANZEx Ex ia IIC T4
(Tamb = –40 to +80 oC) IP67, IP68
(International) IECEx TSA 04.0020X Ex ia IIC T4
(Brazil) INMETRO: BR-Ex ia IIC T4
Non-incendive: (US) FM2:
Class I, Div. 2, Groups A, B, C, D T5
• Marine Lloyd’s Register of Shipping
ABS Type Approval
Notes:
• Please check the ambient and operating temperatures under Enclosure on this page,
and Approvals (verify against device nameplate) on page 10; also check Approvals
(verify against device nameplate)
on page 10, for the specific configuration you are
about to use or install.
• The use of approved watertight conduit hubs/glands is required for Type 4X /
NEMA 4X, Type 6 / NEMA 6, IP67, IP68 (outdoor applications).
1. See 'Intrinsically safe connection drawing (FM)' on page 106 for drawing number 23651611, or
'Intrinsically safe connection drawing (CSA)' on page 107 for drawing number 23651621.
2. See 'Non-incendive connection drawing (FM)' on page 108 for drawing number 23650537.
Note: EN 61000-4-3 (CE EMC) testing was conducted on the SITRANS Probe LR while
mounted in a metallic vessel.

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 11
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Installation
Installation1
WARNINGS:
• Installation shall only be performed by qualified personnel and in
accordance with local governing regulations.
• SITRANS Probe LR ‘is to be used only in the manner outlined in this
manual, otherwise protection provided by the device may be impaired.
• Never attempt to loosen, remove, or disassemble process connection
or instrument housing while vessel contents are under pressure.
• This product is designated as a Pressure Accessory per Directive 97/ 23
/ EC and is not intended for use as a safety device.
• Materials of construction are chosen based on their chemical
compatibility (or inertness) for general purposes. For exposure to
specific environments, check with chemical compatibility charts
before installing.
• The user is responsible for the selection of bolting and gasket materials
which will fall within the limits of the flange and its intended use and
which are suitable for the service conditions.
• Improper installation may result in loss of process pressure.
Notes:
• Refer to the device nameplate for approval information.
• The Process Device Tag shall remain with the process pressure boundary
assembly1. In the event the instrument package is replaced, the Process Device Tag
shall be transferred to the replacement unit.
• SITRANS Probe LR units are hydrostatically tested, meeting or exceeding the
requirements of the ASME Boiler and Pressure Vessel Code and the European
Pressure Equipment Directive.
• The serial numbers stamped in each process connection body provide a unique
identification number indicating date of manufacture.
Example: MMDDYY – XXX (where MM = month, DD = day, YY = year, and
XXX= sequential unit produced
Further markings (space permitting) indicate flange configuration, size, pressure
class, material, and material heat code.
1. The process pressure boundary assembly comprises the components that act as a barrier
against pressure loss from the process vessel: that is, the combination of process connection
body and emitter, but normally excluding the electrical enclosure.

PPage 12 SITRANS Probe LR – INSTRUCTION MANUAL 7ML19985HR02
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Installation
Mounting location
Recommendations:
• Ensure ambient temperature is within –40 to 80 oC (–40 to 176 oF).
• Provide easy access for viewing the display and programming via the handheld
programmer.
• Ensure the environment is suitable to the housing rating and materials of
construction.1
Precautions:
• Avoid proximity to high voltage or current wiring, high voltage or current contacts,
and to variable frequency motor speed controllers.
• Avoid interference to the emission cone from obstructions or from the fill path.
• Avoid central locations on vessels.
1. When the locking collar is secured, it prevents the enclosure rotating on the threaded
connection.
WARNING: For vessels with conical or parabolic tops, avoid
mounting the instrument at the centre. (The concavity of the top can
focus echoes into the centre, giving false readings.)
Note: Under certain circumstances, it may be acceptable to mount SITRANS Probe LR
at the centre of a flat-topped tank: please discuss this with your Siemens Milltronics
representative.
process temperature:
–40 to 80 oC (–40 to 176 oF)
ambient temperature
(surrounding enclosure volume)
–40 to 80 oC (–40 to 176 oF)
handheld programmer
nameplate
location
process
device tag
customer-
supplied
flange
locking collar1over threaded connection;
secured by three 2 mm Allen set-screws
Coni
Fl at
Flat ParabolicConical
preferred
undesirable

7ML19985HR02 SITRANS Probe LR – INSTRUCTION MANUAL Page 13
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Installation
Keep the emission cone free of interference:
• Make allowance for the emission cone spreading: allow a minimum of 300 mm (1 ft)
for every 3 m (10 ft) of vessel height.
• Locate the antenna away from the side wall, to avoid interference from indirect
echoes.
• Avoid interference from objects such as ladders or pipes, which can cause false
echoes.
• Make sure the beam angle does not intersect the fill path.
minimum of 300 mm (1ft) for
every 3 m (10 ft) of vessel height.
beam
angle
28o
Notes:
• Beam angle is defined at the
-3dB boundary, or 1/2 signal
level. Obstructions outside of
the beam may still be detected,
depending on the size, shape,
or distance from the antenna.
• For more detail on false
echoes, see
False-Echo
Suppression
on page 94.

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Installation
Location on a nozzle, or on a manhole cover
On a nozzle, the end of the shield section should protrude a minimum of 10 mm (0.4”) to
avoid interference.
A manhole cover is typically a covered nozzle with a diameter of 610 mm (24”) or greater.
To provide optimum signal conditions on a manhole cover, locate the antenna off-center,
typically 100 mm (4") from the side.
Mounting Instructions
1. Before inserting SITRANS Probe LR into its mounting connection, check to ensure
the threads are matching, to avoid damaging them.
2. Simply screw SITRANS Probe LR into the process connection, and hand tighten. For
pressure applications, it will be necessary to use PTFE tape (or other appropriate
thread sealing compound) and tighten the process connection beyond hand tight.
The maximum torque is 40 N-m (30 ft.lbs.).
3. If you want to rotate the enclosure, use a 2 mm Allen key to loosen the three set-
screws that secure the locking collar.
4. Once the enclosure is in a suitable position, tighten the set-screws.
Notes:
• Use the 100 mm (4") shield on nozzles that are 100 mm (4") in length, or shorter.
• Use the 250 mm (10") shield on nozzles that are 250 mm (10") in length, or shorter.
• If your nozzle is longer than 250 mm (10"), contact your local representative. You will
need to exchange the device for a different model with a longer shield length.
Note: For details on other applications, see Appendix F: Special Applications on
page 98.
Note: Do not rotate the enclosure after programming and vessel calibration, otherwise
an error may occur, caused by a polarity shift of the transmit pulse.
100 mm (4")
10 mm
(0.4")
locking collar secured by three 2 mm Allen set-screws
threaded connection
shield