Siemens SITRANS LG250 User manual

Operating Instructions • 03/2014
Guided Wave Radar
SITRANS LG250
Foundation Fieldbus
Coax probe

2PBD-51041056SITRANS LG250 - Operating Instructions
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PBD-51041056 SITRANS LG250 - Operating Instructions
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Contents
1About this document
1.1 Function ........................................................................................................................... 5
1.2 Target group ..................................................................................................................... 5
1.3 Symbols used................................................................................................................... 5
2For your safety
2.1 Authorised personnel ....................................................................................................... 6
2.2 Appropriate use................................................................................................................ 6
2.3 Warning about incorrect use............................................................................................. 6
2.4 General safety instructions............................................................................................... 6
2.5 CE conformity................................................................................................................... 6
2.6 NAMUR recommendations .............................................................................................. 7
2.7 Environmental instructions ............................................................................................... 7
3Product description
3.1 Conguration.................................................................................................................... 8
3.2 Principle of operation........................................................................................................ 9
3.3 Packaging, transport and storage................................................................................... 11
3.4 Accessories and replacement parts ............................................................................... 11
4Mounting
4.1 General instructions ....................................................................................................... 13
4.2 Mounting instructions ..................................................................................................... 14
5 Connecting to power supply
5.1 Preparing the connection ............................................................................................... 17
5.2 Connecting..................................................................................................................... 17
5.3 Wiring plan, single chamber housing.............................................................................. 19
5.4 Wiring plan, double chamber housing ............................................................................ 19
5.5 Double chamber housing with DIS-ADAPT .................................................................... 21
5.6 Switch-on phase............................................................................................................. 21
6 Set up with the display and adjustment module
6.1 Insert display and adjustment module............................................................................ 23
6.2 Adjustment system......................................................................................................... 24
6.3 Parameter adjustment - Quick setup .............................................................................. 25
6.4 Parameter adjustment - Extended adjustment................................................................ 28
6.5 Saving the parameter adjustment data........................................................................... 43
7 Setup with PACTware
7.1 Connect the PC.............................................................................................................. 44
7.2 Parameter adjustment with PACTware............................................................................ 44
7.3 Set up with the quick setup............................................................................................. 45
7.4 Saving the parameter adjustment data........................................................................... 50
8 Set up with other systems
8.1 DD adjustment programs ............................................................................................... 51
8.2 Field Communicator 375, 475 ........................................................................................ 51
9 Diagnostics and service
9.1 Maintenance .................................................................................................................. 52
9.2 Diagnosis memory ......................................................................................................... 52
9.3 Status messages............................................................................................................ 53

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9.4 Rectify faults................................................................................................................... 57
9.5 Exchanging the electronics module................................................................................ 59
9.6 Software update ............................................................................................................. 60
9.7 How to proceed if a repair is needed.............................................................................. 60
10 Dismounting
10.1 Dismounting steps.......................................................................................................... 61
10.2 Disposal ......................................................................................................................... 61
11 Supplement
11.1 Technical data ................................................................................................................ 62
11.2 Supplementary information Foundation Fieldbus ........................................................... 71
11.3 Dimensions .................................................................................................................... 82
Safety instructions for Ex areas
PleasenotetheEx-specicsafetyinformationforinstallationandop-
eration in Ex areas. These safety instructions are part of the operating
instructions manual and come with the Ex-approved instruments.
Editing status: 2014-03-17

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PBD-51041056 SITRANS LG250 - Operating Instructions
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1About this document
1.1 Function
This operating instructions manual provides all the information you
need for mounting, connection and setup as well as important instruc-
tionsformaintenanceandfaultrectication.Pleasereadthisinforma-
tion before putting the instrument into operation and keep this manual
accessible in the immediate vicinity of the device.
1.2 Target group
This operating instructions manual is directed to trained specialist
personnel. The contents of this manual should be made available to
these personnel and put into practice by them.
1.3 Symbols used
Information, tip, note
This symbol indicates helpful additional information.
Caution: If this warning is ignored, faults or malfunctions can result.
Warning: If this warning is ignored, injury to persons and/or serious
damage to the instrument can result.
Danger: If this warning is ignored, serious injury to persons and/or
destruction of the instrument can result.
Ex applications
This symbol indicates special instructions for Ex applications.
•List
The dot set in front indicates a list with no implied sequence.
→ Action
This arrow indicates a single action.
1Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Battery disposal
This symbol indicates special information about the disposal of bat-
teries and accumulators.

6PBD-51041056SITRANS LG250 - Operating Instructions
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2For your safety
2.1 Authorised personnel
All operations described in this operating instructions manual must
be carried out only by trained specialist personnel authorised by the
plant operator.
During work on and with the device the required personal protective
equipment must always be worn.
2.2 Appropriate use
SITRANS LG250 is a sensor for continuous level measurement.
Youcannddetailedinformationabouttheareaofapplicationin
chapter "Product description".
Operational reliability is ensured only if the instrument is properly
usedaccordingtothespecicationsintheoperatinginstructions
manual as well as possible supplementary instructions.
2.3 Warning about incorrect use
Inappropriate or incorrect use of the instrument can give rise to
application-specichazards,e.g.vesseloverllordamagetosystem
components through incorrect mounting or adjustment.
2.4 General safety instructions
This is a state-of-the-art instrument complying with all prevailing
regulations and guidelines. The instrument must only be operated in a
technicallyawlessandreliablecondition.Theoperatorisresponsible
for the trouble-free operation of the instrument.
During the entire duration of use, the user is obliged to determine the
compliance of the necessary occupational safety measures with the
current valid rules and regulations and also take note of new regula-
tions.
The safety instructions in this operating instructions manual, the na-
tional installation standards as well as the valid safety regulations and
accident prevention rules must be observed by the user.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbi-
traryconversionsormodicationsareexplicitlyforbidden.
The safety approval markings and safety tips on the device must also
be observed.
2.5 CE conformity
ThedevicefulllsthelegalrequirementsoftheapplicableECguide-
lines.ByaxingtheCEmarking,weconrmsuccessfultestingofthe
product.
YoucanndtheCECerticateofConformityinthedownloadsection
of our homepage.

7PBD-51041056 SITRANS LG250 - Operating Instructions
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Electromagnetic compatibility
Instruments in four-wire or Ex-d-ia version are designed for use in an
industrial environment. Nevertheless, electromagnetic interference
from electrical conductors and radiated emissions must be taken into
account, as is usual with class A instruments according to EN 61326-
1.Iftheinstrumentisusedinadierentenvironment,theelectromag-
netic compatibility to other instruments must be ensured by suitable
measures.
2.6 NAMUR recommendations
NAMUR is the automation technology user association in the process
industry in Germany. The published NAMUR recommendations are
acceptedasthestandardineldinstrumentation.
ThedevicefulllstherequirementsofthefollowingNAMURrecom-
mendations:
•NE 21 – Electromagnetic compatibility of equipment
•NE 43 – Signal level for malfunction information from measuring
transducers
•NE53–Compatibilityofelddevicesanddisplay/adjustment
components
•NE107–Self-monitoringanddiagnosisofelddevices
For further information see www.namur.de.
2.7 Environmental instructions
Protection of the environment is one of our most important duties.
That is why we have introduced an environment management system
with the goal of continuously improving company environmental pro-
tection.Theenvironmentmanagementsystemiscertiedaccording
to DIN EN ISO 14001.
Pleasehelpusfulllthisobligationbyobservingtheenvironmental
instructions in this manual:
•Chapter "Packaging, transport and storage"
•Chapter "Disposal"

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3Product description
3.1 Conguration
Thetypelabelcontainsthemostimportantdataforidenticationand
use of the instrument:
2
1
5
3
6
4
7
8
11
12
13
10
9
1
Fig. 1: Layout of the type label (example)
1 Instrument type
2 Product code
3 Process and ambient temperature, process pressure
4 Process pressure
5 Signal output electronics
6 Voltage supply
7 Protection rating
8 Order number
9 Identicationcode
10 Serial number of the instrument
11 Symbol of the device protection class
12 Reminder to observe the instrument documentation
13 ID numbers, instrument documentation
This operating instructions manual applies to the following instrument
versions:
•Hardware from 1.0.0
•Software from 1.0.0
•OnlyforinstrumentversionswithoutSILqualication
This electronics version can be determined via the product code on
the type label as well as on the electronics.
•Standard electronics: Type FX80FF.-
The scope of delivery encompasses:
•Sensor
•Documentation
– this operating instructions manual
– Testcerticatemeasuringaccuracy(optional)
– Operating instructions manual "Display and adjustment mod-
ule"(optional)
Type label
Scope of this operating
instructions manual
Versions
Scope of delivery

9PBD-51041056 SITRANS LG250 - Operating Instructions
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– Supplementary instructions manual "Plug connector for con-
tinuously measuring sensors"(optional)
– Ex-specic"Safety instructions"(withExversions)
– ifnecessary,furthercerticates
3.2 Principle of operation
The SITRANS LG250 is a level sensor with coax probe for continuous
level or interface measurement, suitable for applications in liquids.
High frequency microwave pulses are guided along a steel cable or
a rod. Upon reaching the product surface, the microwave pulses are
reected.Therunningtimeisevaluatedbytheinstrumentandoutput-
ted as level.
d
h
1
Fig. 2: Level measurement
1 Sensorreferenceplane(sealsurfaceoftheprocesstting)
d Distance to the interface
h Height - Level
Probe end tracking
To increase sensitivity, the probe is equipped with probe end tracking.
In products with a low dielectric constant, this function is very helpful.
This is the case, for example, in plastic granules, packing chips or in
vesselswithuidizedproducts.
Between a dielectric constant of 1.5 and 3, the function switches on, if
required. As soon as the level echo can no longer be detected, probe
end tracking is automatically activated. The measurement is contin-
ued with the last calculated dielectric constant.
The accuracy thus depends on the stability of the dielectric constant.
If you measure a medium with a dielectric constant below 1.5, probe
end tracking is always active. In this case, you have to enter the
dielectric constant of the medium. A stable dielectric constant is very
important here.
High frequency microwave impulses are guided along a steel cable or
rod. Upon reaching the product surface, a part of the microwave im-
Application area
Functional principle -
level measurement
Functional principle - in-
terface measurement

10 PBD-51041056SITRANS LG250 - Operating Instructions
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pulsesisreected.Theotherpartpassesthroughtheupperproduct
andisreectedbytheinterface.Therunningtimestothetwoproduct
layers are processed by the instrument.
TS
d1
h1
h2
d2
1
L2
L1
L3
Fig. 3: Interface measurement
1 Sensorreferenceplane(sealsurfaceoftheprocesstting)
d1 Distance to the interface
d2 Distance to the level
TS Thickness of the upper medium (d1 - d2)
h1 Height - Interface
h2 Height - Level
L1 Lower medium
L2 Upper medium
L3 Gas phase
Upper medium (L2)
•The upper medium must not be conductive
•The dielectric constant of the upper medium or the actual distance
totheinterfacemustbeknown(inputrequired).Min.dielectriccon-
stant:1.6.Yo ucanndalistofdielectricconstantsonourhome
page: www.siemens.com/sitranslg.
•The composition of the upper medium must be stable, no varying
products or mixtures
•Theuppermediummustbehomogeneous,nostratications
within the medium
•Min.thicknessoftheuppermedium50mm(1.97in)
•Clear separation from the lower medium, emulsion phase or detri-
tuslayermax.50mm(1.97in)
•If possible, no foam on the surface
Lower medium (L1)
•The dielectric constant must be 10 higher than the dielectric
constant of the upper medium, preferably electrically conductive.
Example: upper medium dielectric constant 2, lower medium at
least dielectric constant 12.
Gas phase (L3)
•Air or gas mixture
Prerequisites for inter-
face measurement

11PBD-51041056 SITRANS LG250 - Operating Instructions
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•Gas phase - dependent on the application, gas pahse does not
alwaysexist(d2=0)
The instrument is always preset to the application "Level measure-
ment".
For the interface measurement, you can select the requested output
signal with the setup.
3.3 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging of standard instruments consists of environment-
friendly, recyclable cardboard. For special versions, PE foam or PE
foil is also used. Dispose of the packaging material via specialised
recycling companies.
Transport must be carried out in due consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or con-
cealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
•Not in the open
•Dry and dust free
•Not exposed to corrosive media
•Protected against solar radiation
•Avoiding mechanical shock and vibration
•Storage and transport temperature see chapter "Supplement -
Technical data - Ambient conditions"
•Relative humidity 20 … 85 %
3.4 Accessories and replacement parts
The display and adjustment module LG Local Display Interface is
used for measured value indication, adjustment and diagnosis. It can
be inserted into the sensor and removed at any time.
Youcanndadditionalinformationintheoperatinginstructions
manual "LG Local Display Interface"(Document-ID43838).
The LG Remote Interface is an external display and adjustment unit
for sensors with single chamber housing and Ex-d double chamber
housing.
Output signal
Packaging
Transport
Transport inspection
Storage
Storage and transport
temperature
Display and adjustment
module
External display and
adjustment unit

12 PBD-51041056SITRANS LG250 - Operating Instructions
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It is suitable for measured value indication and adjustment of sensors
and is connected to the sensor with a four-wire standard cable up to
50m(164ft)long.
Youcanndadditionalinformationintheoperatinginstructions
manual "LG Remote Interface".
The LG Remote Interface is suitable for measured value indication
and adjustment of sensors with HART protocol. It is looped into the
4 … 20 mA/HART signal cable.
Youcanndadditionalinformationintheoperatinginstructions
manual "LG Remote Interface".
The adapter "DIS-ADAPT" is an accessory part for sensors with dou-
ble chamber housings. It enables the connection of the exterbal dis-
play and adjustment unit to the sensor housing via an M12 x 1 plug.
Youcanndfurtherinformationinthesupplementaryinstructions
"Adapter DISADAPT".
The electronics module SITRANS series LG is a replacement part for
TDRsensorsofSITRANSseriesLG.Thereisadierentversionavail-
able for each type of signal output.
Youcanndfurtherinformationintheoperatinginstructionsmanual
"Electronics module SITRANS series LG".
External display and ad-
justment unit with HART
protocol
DIS-ADAPT
Electronics module

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PBD-51041056 SITRANS LG250 - Operating Instructions
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4Mounting
4.1 General instructions
Oninstrumentswithprocessttingthread,thehexagonmustbetight-
enedwithasuitablescrewdriver.Wrenchsizeseechapter"Dimen-
sions".
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Protect your instrument against moisture penetration through the fol-
lowing measures:
•Usetherecommendedcable(seechapter"Connecting to power
supply")
•Tighten the cable gland
•Turn the housing in such a way that the cable gland points down-
ward
•Loop the connection cable downward in front of the cable gland
This applies particularly to:
•Outdoor mounting
•Installationsinareaswherehighhumidityisexpected(e.g.through
cleaningprocesses)
•Installations on cooled or heated vessels
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
openings for the cable glands are therefore covered with red protec-
tive caps as transport protection.
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
The suitable cable glands and blind plugs come with the instrument.
Make sure that all parts of the instrument exposed to the process are
suitable for the existing process conditions.
These are mainly:
•Active measuring component
•Processtting
•Process seal
Process conditions are particularly:
•Process pressure
•Process temperature
•Chemical properties of the medium
•Abrasionandmechanicalinuences
Youcanndthespecicationsoftheprocessconditionsinchapter
"Technical data" as well as on the type label.
Screwing in
Protection against mois-
ture
Protective caps
Suitability for the process
conditions

14 PBD-51041056SITRANS LG250 - Operating Instructions
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4.2 Mounting instructions
During operation, the probe must not touch any installations or the
vessel wall. If necessary, fasten the probe end.
In vessels with conical bottom it can be advantageous to mount the
sensor in the center of the vessel, as measurement is then possible
nearly down to the lowest point of the bottom. Keep in mind that
measurement all the way down to the tip of the probe may not be pos-
sible.Theexactvalueofthemin.distance(lowerdeadband)isstated
in chapter "Technical data".
Fig. 4: Vessel with conical bottom
Before beginning the welding work, remove the electronics module
from the sensor. By doing this, you avoid damage to the electronics
through inductive coupling.
Donotmounttheinstrumentsinorabovethellingstream.Makesure
thatyoudetecttheproductsurface,nottheinowingproduct.
Fig.5:Mountingofthesensorwithinowingmedium
Installation position
Welding work
Inowingmedium

15PBD-51041056 SITRANS LG250 - Operating Instructions
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The reference plane for the measuring range of the sensors is the
sealingsurfaceofthethreadorange.
Keep in mind that a min. distance must be maintained below the refer-
ence plane and possibly also at the end of the probe - measurement
intheseareasisnotpossible(deadband).Thesedeadbandsare
listed in chapter "Technical data". Keep in mind for the adjustment that
the default setting for the measuring range refers to water.
Theprocessttingmustbesealedifthereisgaugeorlowpressurein
the vessel. Before use, check if the seal material is resistant against
the measured product and the process temperature.
Themax.permissiblepressureisspeciedinchapter"Technical
data" or on the type label of the sensor.
Vapours, superimposed gases, high pressures and temperature dif-
ferences can change the spreading speed of radar impulses.
There are two possibilities to correct these deviations.
Corrective value in the process control system
Inthetechnicaldataunder"Inuenceofsuperimposedgasandpres-
sureonaccuracy"youcanndatablewithdeviationvaluesinsome
typical gases or in steam.
Inthecontrolsystem(DCS)youcancorrectthemeasurementresults
of the SITRANS LG250 with these values.
The prerequisite is constant temperature and pressure in the vessel.
Automatic correction via the reference distance
The SITRANS LG250 can be equipped optionally with a running time
correction via reference distance. The probe can carry out an auto-
matic running time correction with it.
Thereferencepointmusthencenotbeoverlled.Theupperdead
bandishence450mm(17.7in).
Measuring range
Pressure
Steam boiler applications

16 PBD-51041056SITRANS LG250 - Operating Instructions
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2
6
3
4
5
1
Fig. 6: Measuring ranges - SITRANS LG250 with steam compensation
1 Reference plane
2 Probe length L
3 Measuring range
4 Upper dead zone with steam compensation = 450 mm (17.7 in)
5 Lower dead band
6 Reference measurement distance to steam compensation

17
PBD-51041056 SITRANS LG250 - Operating Instructions
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5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
•Connect only in the complete absence of line voltage
•If overvoltage surges are expected, overvoltage arresters should
be installed
The instrument requires a operating voltage of 9 … 32 V DC. Operat-
ing voltage and the digital bus signal are carried on the same two-wire
connection cable. Power is supplied via the H1 power supply.
Connection is carried out with screened cable according to Fieldbus
specication.
Use cable with round cross section for instruments with housing and
cablegland.To ensurethesealeectofthecablegland(IPprotection
rating),ndoutwhichcableouterdiameterthecableglandissuitable
for.
Useacableglandttingthecablediameter.
Make sure that the entire installation is carried out according to the
Fieldbusspecication.Inparticular,makesurethatthebusistermi-
nated with suitable terminating resistors.
With plastic housing, the NPT cable gland or the Conduit steel tube
must be screwed without grease into the threaded insert.
Max. torque for all housings see chapter "Technical data".
Make sure that the cable screen and grounding are carried out ac-
cordingtoFieldbusspecication.Werecommendtoconnectthe
cable screen to ground potential on both ends.
In systems with potential equalisation, connect the cable screen
directly to ground potential at the power supply unit, in the connection
box and at the sensor. The screen in the sensor must be connected
directly to the internal ground terminal.The ground terminal outside
onthehousingmustbeconnectedtothepotentialequalisation(low
impedance).
5.2 Connecting
The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
Connection to the display and adjustment module or to the interface
adapter is carried out via contact pins in the housing.
Information:
The terminal block is pluggable and can be removed from the
electronics. To do this, lift the terminal block with a small screwdriver
and pull it out. When reinserting the terminal block, you should hear it
snap in.
Safety instructions
Voltage supply
Connection cable
Cable gland ½ NPT
Cable screening and
grounding
Connection technology

18 PBD-51041056SITRANS LG250 - Operating Instructions
44573-EN-140321
Proceed as follows:
1. Unscrew the housing cover
2. If a display and adjustment module is installed, remove it by turn-
ing it slightly to the left.
3. Loosen compression nut of the cable entry gland
4. Removeapprox.10cm(4in)ofthecablemantle,stripapprox.
1cm(0.4in)ofinsulationfromtheendsoftheindividualwires
5. Insert the cable into the sensor through the cable entry
Fig. 7: Connection steps 5 and 6 - Single chamber housing
Fig. 8: Connection steps 5 and 6 - Double chamber housing
6. Insert the wire ends into the terminals according to the wiring plan
Connection procedure

19PBD-51041056 SITRANS LG250 - Operating Instructions
44573-EN-140321
Information:
Solidcoresaswellasexiblecoreswithwireendsleevesareinsert-
eddirectlyintotheterminalopenings.Incaseofexiblecoreswithout
end sleeves, press the terminal from above with a small screwdriver,
the terminal opening is then free. When the screwdriver is released,
the terminal closes again.
Youcanndfurtherinformationonthemax.wirecross-sectionunder
"Technical data/Electromechanical data"
7. Check the hold of the wires in the terminals by lightly pulling on
them
8. Connect the screen to the internal ground terminal, connect the
outer ground terminal to potential equalisation
9. Tighten the compression nut of the cable entry gland. The seal
ring must completely encircle the cable
10. Reinsert the display and adjustment module, if one was installed
11. Screw the housing cover back on
Theelectricalconnectionisnished.
5.3 Wiring plan, single chamber housing
The following illustration applies to the non-Ex, Ex-ia and Ex-d ver-
sion.
12
( ) (-)
1
5
0
1
0
1
+678
Bus
2
3
4
5
Fig. 9: Electronics and terminal compartment, single chamber housing
1 Voltage supply, signal output
2 Contact pins for the display and adjustment module or interface adapter
3 Simulation switch ("1" = mode for simulation release)
4 For external display and adjustment unit
5 Ground terminal for connection of the cable screen
5.4 Wiring plan, double chamber housing
The following illustrations apply to the non-Ex as well as to the Ex-ia
version.
Electronics and terminal
compartment

20 PBD-51041056SITRANS LG250 - Operating Instructions
44573-EN-140321
5
0
1
0
1
+678
Bus
2
3
12
( ) (-)
11
Fig. 10: Electronics compartment, double chamber housing
1 Internal connection to the connection compartment
2 Contact pins for the display and adjustment module or interface adapter
3 Simulation switch ("on" = simulation mode)
Bus
5
12
+
( ) (-)
678
2
3
4
1
Fig. 11: Terminal compartment, double chamber housing
1 Voltage supply, signal output
2 For display and adjustment module or interface adapter
3 For external display and adjustment unit
4 Ground terminal for connection of the cable screen
Information:
The use of an external display and adjustment unit and a display and
adjustment module in parallel in the connection compartment is not
supported.
Electronics compartment
Terminal compartment