Siemens Sitrans LR250 Administrator guide

SITRANS LR250 with FOUNDATION FIELDBUS
SITRANS
Radar level transmitters
SITRANS LR250 with FOUNDATION
FIELDBUS
Compact Operating Instructions
7ML5431 (LR250)
7ML5432 (LR250 flanged encapsulated antenna)
7ML5433 (LR250 hygienic encapsulated antenna)
09/2021
A5E48453221
-AB
Introduction
1
Safety information
2
Description
3
Installing/mounting
4
Connecting
5
Commissioning
6
Remote operation
7
Service and maintenance
8
Technical specifications
9
Product documentation and
support
A

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E48453221
Ⓟ
04/2022 Subject to change
Copyright © Siemens AG 2021.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 3
Table of contents
1 Introduction ........................................................................................................................................... 5
1.1 LR250 FF manual usage ....................................................................................................... 5
1.2 Technical publications.......................................................................................................... 5
1.3 Purpose of this documentation ............................................................................................ 5
1.4 Industrial use note............................................................................................................... 6
1.5 Checking the consignment................................................................................................... 6
1.6 Security information ............................................................................................................ 7
1.7 Transportation and storage.................................................................................................. 7
1.8 Notes on warranty ............................................................................................................... 8
2 Safety information................................................................................................................................. 9
2.1 Preconditions for safe use .................................................................................................... 9
2.1.1 Safety marking symbols ....................................................................................................... 9
2.1.2 Laws and directives.............................................................................................................. 9
2.1.3 FCC Conformity ................................................................................................................. 10
2.1.4 Industry Canada conformity ............................................................................................... 10
2.1.5 Industry Canada conformity note ....................................................................................... 11
2.1.6 Conformity with European directives.................................................................................. 11
2.1.7 Conformity with UK regulations ......................................................................................... 12
2.1.8 Radio Equipment - EU Directive (RED) 2014/53/EU and UK regulation SI 2017/1206 ............ 12
2.1.9 CE and UKCA Electromagnetic Compatibility (EMC) Conformity .......................................... 13
2.2 Improper device modifications ........................................................................................... 13
2.3 Requirements for special applications................................................................................. 14
2.4 Use in hazardous areas ...................................................................................................... 14
3 Description........................................................................................................................................... 15
3.1 SITRANS LR250 overview ................................................................................................... 15
4 Installing/mounting ............................................................................................................................. 16
4.1 Basic safety information..................................................................................................... 16
4.1.1 Unsuitable cables, cable glands and/or plugs ...................................................................... 17
4.1.2 Pressure applications ......................................................................................................... 18
4.1.2.1 Pressure Equipment Directive, PED, 2014/68/EU ................................................................. 18
4.2 Installation location requirements...................................................................................... 19
4.3 Proper mounting ............................................................................................................... 20
4.3.1 Mounting location ............................................................................................................. 20
4.3.2 Nozzle design .................................................................................................................... 21
4.3.3 Nozzle location .................................................................................................................. 22

Table of contents
SITRANS LR250 with FOUNDATION FIELDBUS
4Compact Operating Instructions, 09/2021, A5E48453221-AB
4.4 Installation instructions...................................................................................................... 24
4.4.1 Threaded versions ............................................................................................................. 25
4.4.2 Flanged versions................................................................................................................ 25
4.4.3 Hygienic versions............................................................................................................... 27
4.5 Disassembly....................................................................................................................... 28
5 Connecting .......................................................................................................................................... 29
5.1 Basic safety information..................................................................................................... 29
5.2 Connecting SITRANS LR250................................................................................................ 30
5.3 Wiring setups for hazardous area installations .................................................................... 34
5.3.1 Configuration with Foundation Fieldbus for hazardous areas.............................................. 35
5.3.2 Intrinsically safe wiring ...................................................................................................... 36
5.3.3 Non-sparking wiring .......................................................................................................... 37
5.4 Instructions specific to hazardous area installations............................................................ 38
5.4.1 (Reference European ATEX Directive 2014/34/EU, Annex II, 1.0.6 and UK Regulation SI
2016/1107) ....................................................................................................................... 38
6 Commissioning .................................................................................................................................... 40
6.1 Basic safety information..................................................................................................... 40
6.2 Programming SITRANS LR250 ............................................................................................ 40
6.2.1 The LCD display ................................................................................................................. 41
6.2.2 Device status icons ............................................................................................................ 42
6.2.3 Handheld programmer (Part No. 7ML1930-1BK) ................................................................ 43
6.2.4 Programming via the handheld programmer ...................................................................... 45
6.2.5 Quick Start Wizard via the handheld programmer............................................................... 49
7 Remote operation................................................................................................................................ 53
7.1 SITRANS Communications: FOUNDATION FIELDBUS............................................................ 53
8 Service and maintenance .................................................................................................................... 54
8.1 Basic safety information..................................................................................................... 54
8.2 Cleaning............................................................................................................................ 55
8.3 Maintenance and repair work............................................................................................. 56
8.3.1 Unit repair and excluded liability ........................................................................................ 56
8.3.2 Part replacement ............................................................................................................... 57
8.4 Disposal............................................................................................................................. 57
8.5 Return procedure............................................................................................................... 58
9 Technical specifications....................................................................................................................... 59
9.1 Power................................................................................................................................ 60
A Product documentation and support .................................................................................................. 61
A.1 Product documentation ..................................................................................................... 61
A.2 Technical support .............................................................................................................. 62
Index.................................................................................................................................................... 63

SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 5
Introduction
1
1.1 LR250 FF manual usage
Note
This manual applies to the SITRANS LR250 (FOUNDATION
™ Fieldbus) only. FOUNDATION™
Fieldbus is a trademark of Fieldbus Foundation.
1.2 Technical publications
Follow these operating instructions for quick, trouble-free installation, and maximum
accuracy and reliability of your device.
We always welcome suggestions and comments about manual content, design, and
accessibility. Please direct your comments to:
Technical publications (mailto:[e-mail])
1.3 Purpose of this documentation
These instructions are a brief summary of important features, functions and safety
information, and contain all information required for safe use of the device. Read the
instructions carefully prior to installation and commissioning. In order to use the device
correctly, first review its principle of operation.
The instructions are aimed at persons who install and commission the device.
To realize optimum performance from the device, read the complete operating instructions.
Complete operating instructions can be downloaded from our web site:
Product page (http://www.siemens.com/LR250)
The printed manual is available from your local Siemens representative.

Introduction
1.4 Industrial use note
SITRANS LR250 with FOUNDATION FIELDBUS
6Compact Operating Instructions, 09/2021, A5E48453221-AB
1.4 Industrial use note
NOTICE
Use in a domestic environment
This Class B Group 1 equipment is intended for use in industrial areas.
In a domestic environment this device may cause radio interference.
1.5 Checking the consignment
1. Check the packaging and the delivered items for visible damages.
2. Report any claims for damages immediately to the shipping company.
3. Retain damaged parts for clarification.
4. Check the scope of delivery by comparing your order to the shipping documents for
correctness and completeness.
WARNING
Using a damaged or incomplete device
Risk of explosion in hazardous areas.
•
Do not use damaged or incomplete devices.

Introduction
1.6 Security information
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 7
1.6 Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be connected
to an enterprise network or the internet if and to the extent such a connection is necessary
and only when appropriate security measures (e.g. firewalls and/or network segmentation)
are in place.
For additional information on industrial security measures that may be implemented, please
visit
https://www.siemens.com/industrialsecurity (https://www.siemens.com/industrialsecurity).
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customer’s exposure to
cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under
https://www.siemens.com/cert (https://www.siemens.com/industrialsecurity).
1.7 Transportation and storage
To guarantee sufficient protection during transport and storage, observe the following:
•Keep the original packaging for subsequent transportation.
•Devices/replacement parts should be returned in their original packaging.
•If the original packaging is no longer available, ensure that all shipments are properly
packaged to provide sufficient protection during transport. Siemens cannot assume
liability for any costs associated with transportation damages.
CAUTION
Insufficient protection during storage
The packaging only provides limited protection against moisture and infiltration.
•
Provide additional packaging as necessary.

Introduction
1.8 Notes on warranty
SITRANS LR250 with FOUNDATION FIELDBUS
8Compact Operating Instructions, 09/2021, A5E48453221-AB
1.8 Notes on warranty
The contents of this manual shall not become part of or modify any prior or existing
agreement, commitment or legal relationship. The sales contract contains all obligations on
the part of Siemens as well as the complete and solely applicable warranty conditions. Any
statements regarding device versions described in the manual do not create new warranties
or modify the existing warranty.
The content reflects the technical status at the time of publishing. Siemens reserves the right
to make technical changes in the course of further development.

SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 9
Safety information
2
2.1 Preconditions for safe use
This device left the factory in good working condition. In order to maintain this status and to
ensure safe operation of the device, observe these instructions and all the specifications
relevant to safety.
Observe the information and symbols on the device. Do not remove any information or
symbols from the device. Always keep the information and symbols in a completely legible
state.
2.1.1 Safety marking symbols
In manual
On product
Description
(Label on product:
yellow back-
ground.)
WARNING: refer to accompanying documents (manual) for
details.
2.1.2 Laws and directives
Observe the safety rules, provisions, and laws applicable in your country during connection,
assembly, and operation. These include, for example:
•National Electrical Code (NEC - NFPA 70) (USA)
•Canadian Electrical Code (CEC Part I) (Canada)
Further provisions for hazardous area applications are for example:
•IEC 60079-14 (International)
•EN 60079-14 (EU and UK)

Safety information
2.1 Preconditions for safe use
SITRANS LR250 with FOUNDATION FIELDBUS
10 Compact Operating Instructions, 09/2021, A5E48453221-AB
2.1.3 FCC Conformity
US Installations only: Federal Communications Commission (FCC) rules
Note
•
This device has been tested and found to comply with the limits Class B digital device 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 device has also been tested and found to comply with the limits §15.256, Subpart C-
Intentional radiators, 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 device 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, in which case the user will be required to correct the interference
at his/her own expense.
•
This device is certified to measure levels in fixed or mobile enclosed tanks made from
metal, concrete or materials with similar RF attenuating properties.
•
Devices equipped with the aluminum horn or the 3 inch or 4 inch stainless horn antennas
may be used to measure levels in open air environments or outside enclosed tanks,
subject to the following conditions:
–Devices shall be installed and maintained to ensure a vertically downward orientation
of the transmit antenna’s main beam.
–Devices shall be installed only at fixed locations. Devices shall not operate while being
moved or while inside a moving container.
–Hand-held applications and residential use are prohibited.
2.1.4 Industry Canada conformity
Canada Installations only: Industry Canada (IC) rules
NOTICE
Use on a "no-interference, no-protection" basis
The installation of the LPR/TLPR device shall be done by trained installers, in strict
compliance with the manufacturer's instructions.
•The use of this device is on a "no-interference, no-protection" basis. That is, the user shall
accept operations of high-powered radar in the same frequency band which may
interfere with or damage this device. However, devices found to interfere with primary
licensing operations will be required to be removed at the user's expense.

Safety information
2.1 Preconditions for safe use
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 11
2.1.5 Industry Canada conformity note
Note
•
This device has been tested and found to comply with the limits RS- 211 - Level Probing
Radar Equipment. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment.
•
This device is certified to measure levels in fixed or mobile enclosed tanks made from
metal, concrete or materials with similar RF attenuating properties.
•
Devices equipped with the aluminum horn or the 3 inch or 4 inch stainless horn antennas
may be used to measure levels in open air environments or outside enclosed tanks,
subject to the following conditions:
–Devices shall be installed and maintained to ensure a vertically downward orientation
of the transmit antenna’s main beam.
–Devices shall be installed only at fixed locations. Devices shall not operate while being
moved or while inside a moving container.
–Hand-held applications and residential use are prohibited.
2.1.6 Conformity with European directives
The CE marking on the device symbolizes the conformity with the following European
directives:
Electromagnetic compatibility EMC
2014/30/EU
Directive of the European Parliament and of the Council
on the harmonisation of the laws of the Member States
relating to electromagnetic compatibility
Low voltage directive LVD
2014/35/EU
Directive of the European Parliament and of the Council
on the ha
rmonisation of the laws of the Member States
relating to the making available on the market of electrical
equipment designed for use within certain voltage limits
Atmosphère explosible ATEX
2014/34/EU
Directive of the European Parliament and the Council on
the harmonisation of the laws of the Member States relat-
ing to equipment and protective systems intended for use
in potentially explosive atmospheres
Pressure equipment directive PED
2014/68/EU
Directive of the European Parliament and of the Council
o
n the harmonisation of the laws of the Member States
relating to the making available on the market of pressure
equipment
Radio equipment directive RED
2014/53/EU
Directive of the European Parliament and of the Council
on the harmonisation of the laws of
the Member States
relating to the making available on the market of radio
equipment and repealing Directive 1999/5/EC
The applicable directives can be found in the EC conformity declaration of the specific device.

Safety information
2.1 Preconditions for safe use
SITRANS LR250 with FOUNDATION FIELDBUS
12 Compact Operating Instructions, 09/2021, A5E48453221-AB
2.1.7 Conformity with UK regulations
The UKCA marking on the device symbolizes the conformity with the following UK
regulations:
Electromagnetic compatibility
EMC SI 2016/1091
Electromagnetic Compatibility Regulations
2016
Low Voltage LVD SI 2016/1101
Electrical Equipment (Safety) Regulations
2016
Explosive atmosphere UKEX SI 2016/1107
Equipment and Protective Systems Intended
for use in Potentially Explosive Atmospheres
Regulations 2016
Pressure equipment SI 2016/1105
Pressure Equipment (Safety) Regulations 2016
Radio equipment SI 2017/1206
Radio Equipment Regulations 2017
RoHS SI 2012/3032
The Restriction of the Use of Certain Hazard-
ous Substances in Electrical and Electronic
Equipment Regulations 2012
The applicable regulations can be found in the UKCA declaration of conformity of the specific
device.
2.1.8 Radio Equipment - EU Directive (RED) 2014/53/EU and UK regulation SI
2017/1206
For the receiver test that covers the influence of an interferer signal to the device, the
performance criterion has at least the following level of performance according to ETSI TS
103 361 [6]:
•Performance criterion: measurement value variation Δd over time during a distance
measurement
•Level of performance: Δd ≤±50 mm

Safety information
2.2 Improper device modifications
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 13
2.1.9 CE and UKCA Electromagnetic Compatibility (EMC) Conformity
This equipment has been tested and found to comply with the following EMC Standards:
EMC Standard
Title
CISPR 11:2009 + A1:2010/EN
55011:2009 + A1:2010, Class B
Limits and methods of measurements of radio dis-
turbance characteristics of industrial, scientific, and
medical (ISM) radio-frequency equipment.
EN 61326:2013
(IEC 61326:2012)
Electrical Equipment for Measurement, Control and
Laboratory Use – Electromagnetic Compatibility.
EN61000-4-2:2009
Electromagnetic Compatibility (EMC) Part 4-2: Testing
and measurement techniques – Electrostatic dis-
charge immunity test.
EN61000-4-3:2006 + A1:2008 + A2:2010
Electromagnetic Compatibility (EMC) Part 4-3: Testing
and measurement techniques – Radiated, radio-
frequency, electromagnetic field immunity test 2006
+ A1:2008 + A2:2010.
EN61000-4-4:2004 + A1:2010
Electromagnetic Compatibility (EMC) Part 4-4: Testing
and measurement techniques – Electrical fast transi-
ent/burst immunity test.
EN61000-4-5:2006
Electromagnetic Compatibility (EMC) Part 4-5: Testing
and measurement techniques – Surge immunity test.
EN61000-4-6:2010
Electromagnetic Compatibility (EMC) Part 4-6: Testing
and measurement techniques – Immunity to conduct-
ed disturbances, induced by radio-frequency fields.
EN61000-4-8:2010
Electromagnetic Compatibility (EMC) Part 4-8: Testing
and measurement techniques – Power frequency
magnetic field immunity test.
2.2 Improper device modifications
WARNING
Improper device modifications
Risk to personnel, system and environment can result from modifications to the device,
particularly in hazardous areas.
•Only carry out modifications that are described in the instructions for the device. Failure
to observe this requirement cancels the manufacturer's warranty and the product
approvals.

Safety information
2.3 Requirements for special applications
SITRANS LR250 with FOUNDATION FIELDBUS
14 Compact Operating Instructions, 09/2021, A5E48453221-AB
2.3 Requirements for special applications
Due to the large number of possible applications, each detail of the described device versions
for each possible scenario during commissioning, operation, maintenance or operation in
systems cannot be considered in the instructions. If you need additional information not
covered by these instructions, contact your local Siemens office or company representative.
Note
Operation under special ambient conditions
We highly recommend that you contact your Siemens representative or our application
department before you operate the device under special ambient conditions as can be
encountered in nuclear power plants or when the device is used for research and
development purposes.
2.4 Use in hazardous areas
Qualified personnel for hazardous area applications
Persons who install, connect, commission, operate, and service the device in a hazardous
area must have the following specific qualifications:
•They are authorized, trained or instructed in operating and maintaining devices and
systems according to the safety regulations for electrical circuits, high pressures,
aggressive, and hazardous media.
•They are authorized, trained, or instructed in carrying out work on electrical circuits for
hazardous systems.
•They are trained or instructed in maintenance and use of appropriate safety equipment
according to the pertinent safety regulations.
WARNING
Loss of safety of device with type of protection "Intrinsic safety Ex i"
If the device has already been operated in non-intrinsically safe circuits or the electrical
specifications have not been observed, the safety of the device is no longer ensured for use
in hazardous areas. There is a danger of explosion.
•Connect the device with type of protection "Intrinsic safety" solely to an intrinsically safe
circuit.
•
Observe the specifications for the electrical data on the certificate.

SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 15
Description
3
3.1 SITRANS LR250 overview
WARNING
Loss of protection
Danger to personnel, system and environment can result from improper use of the device.
•SITRANS LR250 is to be used only in the manner outlined in this manual, otherwise
protection provided by the device may be impaired.
SITRANS LR250 is a 2-wire 25 GHz pulse radar level transmitter for continuous monitoring of
liquids and slurries in storage vessels including high pressure and high temperature, to a
range of 20 meters (66 feet). It is ideal for small vessels, material such as chemicals, food,
beverages, solvents (including those of corrosive or aggressive nature), and low dielectric
media.
The device consists of an electronic circuit coupled to a permanently attached antenna and
either a threaded or flange type process connection.
This device supports Foundation Fieldbus (FF) communication protocol. Signals are processed
using Process Intelligence which has been field proven in over 1,000,000 applications
worldwide (ultrasonic and radar). This device can be configured as an FF (H1) Link Master.

SITRANS LR250 with FOUNDATION FIELDBUS
16 Compact Operating Instructions, 09/2021, A5E48453221-AB
Installing/mounting
4
4.1 Basic safety information
Note
Material compatibility
Siemens can provide you with support
concerning selection of parts wetted by process
media. However, you are responsible for the selection of parts. Siemens accepts no liability
for faults or failures resulting from incompatible materials.
WARNING
Unsuitable connecting parts
Risk of injury or poisoning.
In case of improper mounting, hot, toxic, and corrosive process media could be released at
the connections.
•Ensure that connecting parts (such as flange gaskets and bolts) are suitable for
connection and process media.
WARNING
Exceeded maximum ambient or process media temperature
Danger of explosion in hazardous areas.
Device damage.
•Make sure that the maximum permissible ambient and process media temperatures of
the device are not exceeded.

Installing/mounting
4.1 Basic safety information
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 17
4.1.1 Unsuitable cables, cable glands and/or plugs
WARNING
Unsuitable cables, cable glands and/or plugs
Risk of explosion in hazardous areas.
•Use only cable glands/plugs that comply with the requirements for the relevant type of
protection.
•Tighten the cable glands in accordance with the torques specified in Installation
instructions (Page 24).
•Close unused cable inlets for the electrical connections.
•When replacing cable glands, only use cable glands of the same type.
•
After installation, check that the cables are seated firmly.
WARNING
Incorrect conduit system
Risk of explosion in hazardous areas as result of open cable inlet or incorrect conduit
system.
•In the case of a conduit system, mount a spark barrier at a defined distance from the
device input. Observe national regulations and the requirements stated in the relevant
approvals.

Installing/mounting
4.1 Basic safety information
SITRANS LR250 with FOUNDATION FIELDBUS
18 Compact Operating Instructions, 09/2021, A5E48453221-AB
4.1.2 Pressure applications
DANGER
Pressure applications
Danger to personnel, system and environment will result from improper disassembly.
•Never attempt to loosen, remove, or disassemble process connection while vessel
contents are under pressure.
WARNING
Pressure applications
Danger to personnel, system and environment can result from improper installation.
•Improper installation may result in loss of process pressure.
WARNING
Exceeded maximum permissible operating pressure
Danger of injury or poisoning.
The maximum permissible operating pressure depends on the device version. The device
can be damaged if the operating pressure is exceeded. Hot, toxic and corrosive process
media could be released.
•Make sure that the device is suitable for the maximum permissible operating pressure of
your system.
Note
•
The process connection tag shall remain with the process pressure boundary assembly.
(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). In the
event the device package is replaced, the process connection tag shall be transferred to
the replacement unit.
•
Representative samples of this device have been hydrostatically tested, meeting or
exceeding the requirement of the ASME Boiler and Pressure Vessel Code and the European
Pressure Equipment Directive.
4.1.2.1 Pressure Equipment Directive, PED, 2014/68/EU
Siemens Level Transmitters with flanged, threaded, or sanitary clamp type process mounts
have no pressure-bearing housing of their own and, therefore, do not come under the
Pressure Equipment Directive as pressure or safety accessories (see EU Commission Guideline
A-08 and A-20).

Installing/mounting
4.2 Installation location requirements
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB 19
4.2 Installation location requirements
WARNING
Aggressive atmospheres
Danger to personnel, system and environment can result from unsuitable environment.
•
Provide an environment suitable to the housing rating and materials of construction.
NOTICE
Direct sunlight
Damage to device.
The device can overheat or materials become brittle due to UV exposure.
•Protect the device from direct sunlight.
•Make sure that the maximum permissible ambient temperature is not exceeded. Refer to
the information in Technical specifications (Page 59).

Installing/mounting
4.3 Proper mounting
SITRANS LR250 with FOUNDATION FIELDBUS
20 Compact Operating Instructions, 09/2021, A5E48453221-AB
4.3 Proper mounting
4.3.1 Mounting location
Note
•
Correct location is key to a successful application.
•
Avoid reflective interference from vessel walls and obstructions by following guidelines in
this chapter.
NOTICE
Incorrect mounting
The device can be damaged, destroyed, or its functionality impaired through improper
mounting.
•Before installing ensure there is no visible damage to the device.
•Make sure that process connectors are clean, and suitable gaskets and glands are used.
•Mount the device using suitable tools. Refer to the information in Installation
instructions (Page 24).
Note
•
On devices with a removable head, there is no limit to the number of times a device can
be rotated without damage.
•
When mounting, orient the front or back of the device towards the closest vessel wall or
obstruction.
•
Do not rotate the enclosure after programming and vessel calibration, otherwise an error
may occur, caused by a polarity shift of the transmit pulse.