NJA-LR400SITRANS LR 400

Instruction ManualSeptember 2001 SITRANS LR 400 SITRANS LR 400 © Siemens Milltronics Process Instruments Inc. 2001 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. Warning: This product can only function properly and safely if it is correctly transported, stored, installed, set up, operated, and maintained. Note: Always use product in accordance with specifications. Copyright Siemens Milltronics Process Instruments Inc. 2001. 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 Inc. Siemens Milltronics Process Instruments Inc. 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. Contact Technical Publications at the following address: Technical Publications Siemens Milltronics Process Instruments Inc. 1954 Technology Drive, P.O. Box 4225 Peterborough, Ontario, Canada, K9J 7B1 Email: [email protected] For the library of SMPI instruction manuals, visit: www.siemens-milltronics.com 7ML19985FH01SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFT i mmmmm Table of Conetns Ta b l e o f C o n t e n t s General Information ...........................................................................................................1 The Manual ...............................................................................................................................................1 SITRANS LR 400 ......................................................................................................................................3 Structure ....................................................................................................................................................3 Specifications ...................................................................................................................... 4 SITRANS LR 400 ......................................................................................................................................4 Dimensions ...............................................................................................................................................8 Installation ......................................................................................................................... 11 Mounting Location ................................................................................................................................ 11 Electrical connection ............................................................................................................................13 Start Up ............................................................................................................................... 15 Self-test ....................................................................................................................................................15 Multi-display ...........................................................................................................................................15 Local Programming ...............................................................................................................................15 Auto-Setup ..............................................................................................................................................15 Operation ............................................................................................................................ 16 General information ..............................................................................................................................16 Measuring principle .............................................................................................................................16 Operating the SITRANS LR 400 .........................................................................................................19 Changing a Parameter Value ..............................................................................................................20 Disabling and enabling programming ..............................................................................................22 Operating examples ..............................................................................................................................23 Parameters (HART) ........................................................................................................... 25 Required Parameters ............................................................................................................................25 Additional Parameters .........................................................................................................................27 Parameters (Profibus PA) ................................................................................................ 53 Troubleshooting ............................................................................................................…

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7ML19985FH01SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFTPage 39 mmmmm Parameters (HART) By using SIMATIC PDM, you can display a list of all echoes in your vessel. It provides the distance between the flange and the measuring mediumís surface, as well as the distances of fixed targets. These may be directly used and transferred to the fix distance list. 4.2.3.9: Auto False Echo Suppression (F = use) Learns and records the current signal up to the suppression distance setting. These signals are then ignored during operation. If all signals fall below this defined threshold, then the failsafe timer is initiated. 4.2.3.A: Auto False Echo Suppression Distance (F = 2/3 vessel height) Defines the end point of the Auto False echo suppression distance 4.2.4: Level Parameter 4.2.4.1: Level URV (= parameter 1.5) 4.2.4.2: Level URV (= parameter 1.6) 4.2.4.3: Level URV (= parameter 1.7) 4.2.4.4: MinLim Level (F = 0 m) Lower limit value of the level (see ìFunctional Dimensionsî on page 25) Set the lower limit value of the level as a height above the LRV. 4.2.4.5: MaxLim Level (F = 0 m) Upper limit value of the level (see ìFunctional Dimensionsî on page 25) Set the upper limit value of the level as a height above the LRV. Values off record use Value variable Value numerical value Value numerical value chap6.fm Page 39 Tuesday, October 9, 2001 2:26 PM Page 40SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFT7ML19985FH01 mmmmm Parameters (HART) 4.2.4.6: HYST Level (F = 0.5 m) Hysteresis of the level limit values Set the hysteresis of the limit values in the units system selected according to Parameter 4.1.1 (see diagram below). Limit value alarm 4.2.5: Volume parameters To calculate the volume of the measuring medium, you need the level parameters (see parameter 4.2.4) in the units selected according to parameter 4.1.1 and additionally a vessel characteristic (parameter 4.2.5.7). 4.2.5.1: Volume URV (F = 20 m 3 ) Full scale of the volume 4.2.5.2: Volume LRV (F = 0 m 3 ) Start of scale of the volume 4.2.5.3: Volume Damping (F = 1 s) Damping of the volume Value numerical value Value numerical value Value numerical value Value numerical value   #4  #       #4  #     #   #   chap6.fm Page 40 Tuesday, October 9, 2001 2:26 PM 7ML19985FH01SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFTPage 41 mmmmm Parameters (HART) 4.2.5.4: MinLim Volume (F = 0 m 3 ) Lower limit value of the volume 4.2.5.5: MaxLim Volume (F = 0 m 3 ) Upper limit value of the volume 4.2.5.6: HYST Volume (F = 0.5 m 3 ) Hysteresis of the volume limit values 4.2.5.7: Tank Characteristic (F = Calibrate/table) Determining the vessel characteristic Select the option ìCalculateî or ìCalibrate/Tableî as required. The selection controls the display of Parameter 4.2.5.8. The possibilities of each parameter are listed below. For the values associated with Parameter 4.2.5.8: Calculate, go to page 43. 4.2.5.8: Calibrate/table If your vessel deviates from the forms offered, the necessary data is not available or is unknown or you need a vessel characteristic with greater accuracy you must calibrate it by liters. You can enter reference values from a table provided by the vessel manufacturer or do the calibration manually and enter the determined reference values. You can only enter pairs of values consisting of level and volume. Value numerical value Value numerical value Value numerical value Value Calibrate/table Calculate Note: Entering the vessel characteristic with the operation and monitoring module can be a time-consuming procedure. It can be done more quickly and comfortably with the SIMATIC PDM software. There, an entered table can be edited simply ñ an option which is only conditionally possible with the operating and monitoring module. chap6.fm Page 41 Tuesday, October 9, 2001 2:26 PM Page 42SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFT7ML19985FH01 mmmmm Parameters (HART) The 4.2.5.8: Calibrate parameter offers the following selection possibilities: 4.2.5.8.1: Calibrate Here you can enter up to 50 reference values whose levels SITRANS LR 400 measures. Enter the appropriate volume (determined by manual calibration). If you access this parameter, first the currently measured level is displayed. Accept it by pressing . Enter the appropriate volume, save it by pressing or reject it by pressing . Then the device displays the ìCalibrateî selection again. Access again (press ) to select a further reference value. The device automatically offers you the next undefined reference value. It is recommended to enter a maximum of two or three reference values for the linear range of the vessel and to use the others for the non-linear portion If you enter a second volume value for the same level, the reference value saved earlier is overwritten. 4.2.5.8.2: Enter table Manual entry of a table Here you can enter up to 50 reference values provided by the vessel manufacturer in any order. The first reference value is offered when you access the parameter. Enter the level as a distance from the floor of the vessel in the units selected according to parameter 4.1.1 (parameter ìEnter levelî and the volume corresponding to the level (parameter ìEnter volumeî). The device then displays the selection ìEnter tableî again. Access again to enter a further reference value. The device automatically offers you the next undefined reference value. It is recommendable to enter a maximum of two or three reference values for the linear range of the vessel and to use the others for the non-linear part. If you enter a second volume value for the same level, the reference value saved earlier is overwritten. Value numerical value chap6.fm Page 42 Tuesday, October 9, 2001 2:26 PM 7ML19985FH01SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFTPage 43 mmmmm Parameters (HART) 4.2.5.8.3: Show table Display table Here you can display the entered reference values sorted on levels. In the second line, the level corresp…

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7ML19985FH01SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFTPage 59 mmmmm Parameters (Profibus PA) 4.4.1.3: Level param. or 4.4.1.3: Volume param. = [4.2.4] = [4.2.5] 4.4.1.4: Line 2 localDisplay in line 2S/N ratioLevel Vo lume Te m p e r a t u r e Validity S/N ratio Amplitude Digital output Analog output 4.4.1.5: Level param.= [4.2.4] or 4.4.1.5: Volume param. = [4.2.5] 4.4.2: Language local = [1.1] 4.4.3: LCD backlightBackground illumination of the LCD offon off 4.5: Device info 4.5.1: Power supplyVoltage range of the built- in power supply unit according to customer specifications non-editable 4.5.2: Flange temper- ature Temperature range of the flange in ∞C according to customer specifications non-editable 4.5.4: Electrical con- nection according to customer specifications non-editable 4.5.5: Antenna&flange 4.5.5.1: Flange sizeRated width of the flange according to customer specifications DN 50, 2 in DN 80, 3 in DN 100, 4 in DN 150, 6 in Special design 4.5.5.2: Flange typeType of flangeaccording to customer specifications DIN ANSI JIS Special design 4.5.5.3: Pressure range Pressure range of the process connection according to customer specifications non-editable Parameters (Profibus PA) Device parameter, parameter, menu identification Description Factory Setting Setting Possibilities chap6.fm Page 59 Tuesday, October 9, 2001 2:26 PM Page 60SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFT7ML19985FH01 mmmmm Parameters (Profibus PA) 4.5.5.4: Antenna typeaccording to customer specifications Horn type long Horn type short Special design 4.5.5.6: Flange mate- rial according to customer specifications 315/316L Special design 4.5.5.7: Seal material Sealing materialaccording to customer specifications Te f l o n Kalrez Viton Perbunan Special design 4.5.6: TagDevice identificationaccording to customer specifications up to any eight characters 4.5.7: DescriptorMeasuring point descrip- tion according to customer specifications up to any 16 char- acters 4.5.8: MessageMeasuring point mes- sage, e.g. the date of last check or clean according to customer specifications up to any 32 char- acters 4.5.9: Manufacturer identification 4.5.9.1: Serial no.Factory serial numberunique num- ber non-editable 4.5.9.2: Order no.Delivery order no. (deliv- ery state) according to customer specifications non-editable 4.5.9.3: Device revi- sion Device versionNumbernon-editable 4.5.9.4: Software revi- sion Numbernon-editable 4.5.9.5: Hardware revision Numbernon-editable 4.5.9.6: Antenna off- set Distance sensor/flangeapprox. 0.5 m (calibration value) non-editable 4.5.9.7: Reference distance Internal reference dis- tance approx. 106 m (calibration value) non-editable 5: Options Parameters (Profibus PA) Device parameter, parameter, menu identification Description Factory Setting Setting Possibilities chap6.fm Page 60 Tuesday, October 9, 2001 2:26 PM 7ML19985FH01SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFTPage 61 mmmmm Parameters (Profibus PA) 5.1: Enter codeInput of customer code to enable programmability Customer code 5.2: Customer codeDetermination of cus- tomer code 0up to 4 digit code 5.3: Factory resetReset all parameters to factory setting noyes no Parameters (Profibus PA) Device parameter, parameter, menu identification Description Factory Setting Setting Possibilities chap6.fm Page 61 Tuesday, October 9, 2001 2:26 PM Page 62Sitrans LR 400 ñ INSTRUCTION MANUAL7ML19985FH01 mmmmm Tr o u b l e s h o o t i n g Troubleshooting The SITRANS LR 400 has left the factory in a fully tested condition. Carefully selected components and compliance with prescribed quality standards guarantee the high reliability of the SITRANS LR 400. In the unlikely event of a fault, please consult the instructions in this chapter before contacting the responsible customer services. Classification of faults Faults occurring in the SITRANS LR 400 can be classified in the following groups: ïfaults caused by ambient influences: over and undertemperature, moisture, contamination by the measuring medium and other substances, mains faults, vibration ïfaults in the device: display, electronics, mechanics, connections Please try to determine the fault and localize it as accurately as possible.. If the fault cannot be eliminated with the measures described, follow the instructions in ìMaintenance and repairsî on page 65. Self-test If you get fault messages after the self-test, please proceed according to ìFault messagesî on page 64. If there is a malfunction in the device, you can also activate the self-test manually with Parameter 3.2.1. Note: The device performs a self-test every time it is switched on. It is ready for operation when the LCD displays the multi-display and the control elements can be operated. chap7.fm Page 62 Tuesday, October 9, 2001 1:06 PM 7ML19985FH01Sitrans LR 400 ñ INSTRUCTION MANUALPage 63 mmmmm Troubleshooting Symptoms, causes and their remedy SymptomPossible causesRemedy No display on the LCD Defective or missing power supply Check that the power supply is connected correctly. Replace the device fuse if necessary (see ìChanging the device fuseî on page 65). LCD is defective Connect a HART Communicator or a PC/Laptop with SIMATIC PDM software. If the device can be parameterized from there, the LCD is defective. Electronics are defective Measure the analog current output. If the output current is not between 3.6 mA < x < 22 mA, the electronics are defective. Replace the electronics unit as described in ìMaintenance and repairsî on page 65. A fault message is displayed Internal fault Call the fault display in Function 3.1. Proceed as described in ìMaintenance and repairsî on page 65. An incorrect measured value appears after Auto-Setup. The device is not parameterized correctly according to the application Set the device parameters and functions manually. No measured value appears after the Auto- Setup (measured value ì0î and the fault display flashes) Internal fault Call the fault display in Function 3.1. Proceed as described in ìMaintenance an…

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28 September, 2001 Federal Communications Commission Oakland Mills Road Columbia, MD 21046 U.S.A. Subject: Request for withholding from public disclosure the schematic diagrams and system block diagrams pursuant to an application for certification Applicant:Siemens Milltronics Process Instruments Inc. Product:Radar Level Gauge (25 GHz) Model No:Sitrans LR 400 FCC ID:NJA-LR400 Dear Sir/Madam, We, Siemens Milltronics Process Instruments Inc., would like to request that the schematic diagrams and system block diagrams submitted with the application for certification be withheld from public disclosure as per Section 0.459 of FCC rules. This request is made under the provisions of Section 0.457 of the Commission’s Rules, and Section 552 (b) (4) of the Freedom of Information Act. These sections authorize as a withholding from public inspection, materials which would be privileged as a matter of law if retained by the person submitting them, and materials which would not customarily be released to the public by that person. The detailed confidential materials are listed as follows: No.TitleDrawing No.Sheet No’s. 1HF Module Sitrans LR HFLR-C1 Detail drawing (schematic and layout) 201501761, 2 2HF Module Sitrans LR HFLR-C1 Detail drawing (block diagram) 201501763 3Antenna specification (process connection)512081, 2, 3 If you have any queries, please do not hesitate to contact us. Yours faithfully T. J. Adam Certification Specialist Tel. (705) 740-7009 E-mail: [email protected]

C:\windows\TEMP\probonholdemail.doc TIMCO TIMCOTIMCO TIMCO ENGINEERING INC. 849 NW State Road 45 Newberry, Florida 32669 http://www.timcoengr.com 888.472.2424 F 352.472.2030 email: tei@t imcoengr.com 9 October 2001 FCC SUBJECT: SIEMENS MILLTRONICS PROCESS INSTRUMENTS INC. FCC ID: NJA-LR400 To Whom It May Concern: It was not clear in the test report but the test laboratory has confirmed that this EUT was tested up to the 5 th of the fundamental. This EUT is always used in a enclosed tank. Sincerely, Sid Sanders

ANNEX 3 - EXTERNAL PHOTOS OF THE EUTPHOTO # 1 SIEMENS MILLTRONICS SITRANS LR ANNEX 3 - EXTERNAL PHOTOS OF THE EUTPHOTO # 2 SIEMENS MILLTRONICS SITRANS LR

Product Group 2365026001 T. ADAMPETERBOROUGH24 / SEPT / 01RADAR FOR CONSTRUCTION CHANGE FCC # PER ECN 01-000-0-0060 01 S. NGUYENR. CLYSDALE 1:1 11 NONE A SITRANS LR 400RADIO APPROVALEXAMPLE MARKING DRAWING 23650260 1 RPCRPC TATA SEPT 24/01 OCT 04/01 CLASS I,DIV 1, GR. A,B,C,DCLASS II, DIV 1, GR. E,F, GCLASS III FCC ID: NJA- LR400 This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions: (1) This device may not cause harmful interference,and(2) This device must accept any interference received, including interference that may cause undesired operation Siemens Milltronics Process Instruments Inc. Peterborough CANADA MADE IN SITRANS LR 400 RADAR LEVEL METER Serial # Amb. Temp.: Enclosure: Output: Power Rating: 120 - 230 V , ±15%, 50/60 Hz, 6 W –40TO65°C TYPE NEMA 4X, 6 / IP67 7ML5421 4-20maHART CANADA 0891 1234567890 0NK01 0BC1

Product Group 2425119300 S. NGUYEN PETERBOROUGH02 / AUGUST / 01RADAR FOR CONSTRUCTION 0 T. ADAMR. CLYSDALE 1:1 1 1 SCALE B SITRANS LR 400NAMEPLATE DRAWING 24251193 0 RPC SN AUG 02/01 BOX NUMBER APPROVAL AGENCY APPROVAL LOGO SIZE BOX 15 BOX 4BOX 5BOX 9BOX 11 CE ATEX FM CSA or BZT CSA NON-HAZ 5mm 7mm7mm 7mm7mm R ICT G750879M NOTES:1. NAMEPLATE INFORMATION TO BE LASER ETCHED ON STAINLESS STEEL BLANK 24251135. 2. FONT UNIVERS 45, 2.3mm HIGH UNLESS OTHERWISE NOTED.3. BOX13 - UNIT PART NUMBER, FONT UNIVERS 55 2.5 mm HIGH.4. BOX 12 - UNIT SERIAL NUMBER5. BOX 8 - BZT APPROVAL AGENCY ID NUMBER 2.3 mm HIGH 6. BOX 6 - HAZARDOUS APPROVAL7. BOX 3 - FCC NUMBER & STATEMENTS8. BOX 7 - INDUSTRY CANADA CANAD A_______ 9. BOX 16 CE APPROVAL AGENCY I.D. 0518 1.5 mm HIGH. 10 , FONT UNIVERS 55 2.5 mm HIGH. FONT UNIVERS 45, . BOX 10 CE RADIO APPROVAL AGENCY I.D. 0891 FONT UNIVERS 45,1.5 mm HIGH. CLASS I,DIV 1, GR. A,B,C,DCLASS II, DIV 1, GR. E,F, GCLASS III FCC ID:NJA-___ This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions: (1) This device may not cause harmful interference,and(2) This device must accept any interference received, including interference that may cause undesired operation R Siemens Milltronics Process Instruments Inc. Peterborough CANADA MADE IN SITRANS LR 400 RADAR LEVEL METER Serial # Amb. Temp.: Enclosure: Output: 19 24 43.5 47 28.5 61 4.4 84 89 55 11 64 74 21 25 BOX 6BOX 5BOX 8BOX 9BOX 11 BOX 15BOX 16BOX 10 BOX 1 BOX 14 BOX 2 BOX 13 BOX 12BOX 17 BOX 7BOX 4BOX 3 Power Rating: 120 - 230 V , ±15%, 50/60 Hz, 6 W –40TO65°C TYPE NEMA 4X, 6 / IP67 BOX 14 7ME4000 (24 GHz) 7ML5421 (25 GHz) BOX 1 (7ME4000 version) (7ML5421 version) ACDFGHJKLMNP ABCDEFGJKL II 2G EEx d IIC T6 II 2G EEx d IIC T6 II 1/2G EEx d IIC T6II 1/2GD EEx dem IIC T6 II 1/2G EEx d IIC T6 II 2G EEx dem IIC T6 II 2G EEx dem IIC T6 II 1/2G EEx dem IIC T6 II 1/2G EEx dem IIC T6 II 2G EEx dem [ib] IIC T6II 2G EEx dem [ia] IIC T6 II 2G EEx dem [ia] IIC T6 II 1/2G EEx dem [ib] IIC T6II 1/2GD EEx dem [ib] IIC T6II 1/2G EEx dem [ia] IIC T6II 1/2GD EEx dem [ia] IIC T6 II 1/2G EEx dem [ia] IIC T6 Box 2 Box 17 01 4-20maHARTPROFI PA CE, CE RADIO, ATEX, FCC, FM, CSA, IND. CAN, HAZ APPROVALS MARKS CE, BZT, ATEXCE, CE RADIO, FCC, FMCE, BZT, ATEXCE, CE RADIO, CSA, INDUSTRY CANCE, BZT, ATEXCE, CE RADIOCE, BZT, ATEXCE, BZT, ATEXCE, BZT, ATEXCE, ATEX CE, BZT, ATEXCE, ATEX CE, BZT, ATEXCE, ATEX CE, BZT, ATEXCE, ATEX CE, BZT, ATEXCE, ATEX CE, BZT, ATEX or BCEF 120 - 230 V , ±15%, 50/60 Hz, 6 W 24 V +25 / -20%, 6 W 24 V +25 / -20%, 6 W

ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 1 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 2 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 3 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 4 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 5 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 6 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 7 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 8 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 9 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 10 SIEMENS MILLTRONICS SITRANS LR ANNEX 4 - INTERNAL PHOTOS OF THE EUTPHOTO # 11 SIEMENS MILLTRONICS SITRANS LR

Siemens Milltronics Sitrans LR 400 Technical Description, 5 September 2001 1. Introduction Siemens Milltronics Sitrans LR 400 is intended for use in process industries for the determination of material level in tanks and other process vessels. The principle used is Frequency Modulated Continuous Wave (FMCW). A microwave frequency is generated whose frequency varies with time. This signal is directed towards the target. The signal is reflected by the target and received by the antenna. The time of flight of the pulse, τ is calculated by comparing the transmitted and received frequencies for a given sweep rate. 2. Technical Description Refer to the block diagram shown on Siemens-Milltronics drawing 20150176 sheet 3. The sweep frequency is obtained by mixing the output of the 2.4 GHz Voltage Controlled Oscillator (VCO) with the 22.4 GHz Local Oscillator (LO). VCO is also applied directly to a saw-wave reference (OFW) to obtain the reference signal REF which can be used to maintain the accuracy of the device over temperature. The sweep (frequency sum of LO and VCO) is applied to the antenna via a splitter. The received signal is then mixed with the transmitted signal to obtain the measured signal MESS (difference frequency). Since in a real measuring system multiple targets exist, the measurement signal will not be a single frequency but will be a combination of many frequencies representing the different targets. Digital Signal Processing techniques are used to extract the frequencies present in the measured signal and to reject false targets to select the correct target and calculate the target distance.

SITRANS LR Microwave Level Meter Application, mode of operation Siemens Catalog Extract FI 01 1
Application The SITRANS LR radar level meter is used to measure the level of liquids and bulk materials. The measuring principle is largely independent of temperature and pressure. The device calcu- lates the filling volume following input of the tank design; the mass can also be displayed if the density of the material is entered in addition. The main applications of the SITRANS LR are found in: 7Chemical industry 7Petrochemical industry 7Pharmaceutical industry 7Power engineering. Versions with the following types of protection are available for use in potentially explosive atmospheres (in preparation): 7II 2G EEx dem [ib] IIC T6, 7II 2G EEx d IIC T6 and 7the above types of protection with Ex zone 0 approval. SITRANS LR is characterized by the following features: 7Level measurement independent of medium permits a wide range of application. 7Minimum maintenance requirements and wear as result of non-contact measurement. 7High long-term stability resulting from self-calibration since the device has a highly stable internal reference. 7High measuring accuracy and repeatability due to 24-GHz technology. 7Nominal diameters from DN 50 to DN 150, or according to customer requirements. 7Antenna extension available for long mounting glands and high temperatures. 7Antenna and flange made of stainless steel or according to customer requirements. 7Modular design. 7Double chamber housing, i.e. separate junction box and elec- tronics area. 7EMC-tested to EN 50 081, EN 50 082 and NAMUR. 7Self-monitoring and diagnosis of all device functions. 7Analog output (4 to 20 mA) and digital output for limits or device status. 7Outputs electrically isolated from the power supply and from one another. 7HART communication. 7Simple menu-based operation with two-line display and four optical input elements; the device can be operated from the outside without opening the housing.
Mode of operation Microwaves propagate in gases at the speed of light. The device transmits microwave signals from the container cover/gland to the surface of the medium and measures the runtime required for the signal to return to the device. The device has an antenna to generate a directional effect for the microwaves. The horn antennae have a very good directional effect and can be used with a gland diameter of 80 mm or more. A rod antenna made of Teflon is in preparation for more limited mounting conditions. The frequency modulated continuous wave procedure (FMCW) used transmits a linear, frequency-modulated radar signal. Fig. 1SITRANS LR microwave level meter, nominal diameter DN 100 Fig. 2Measuring principle The offset frequency of the signal reflected from the surface of the medium is dependent on the runtime and results in an offset in the phase or frequency between the transmitted and received signals. The resulting signal is sinusoidal with a frequency in the kHz range. This frequency is proportional to the distance from the surface of the medium. Using a Fourier transformation, the measured signal is converted into an echo profile (see Fig. 2). Measured signal in time domain Amplitude Time Measured signal transformed to frequency domain 0 0.511.522.533.544.55 1 2 3 4 5 6 7 8 F ̧llstand FMCW radar RX TX Run time dT Distance Amplitude Radar frequency Distance Time RX TX TX: Transmission signal RX: Reflection signal SITRANS LR s SITRANS LR Microwave Level Meter Siemens Catalog Extract FI 01 2 SITRANS LR Microwave Level Meter Operation, technical data
Operation The level meter (Fig. 3) can be operated using: 7Operating and display module or 7HART communicator or 7PC/laptop and software SIMATIC PDM. Fig. 3Operation possibilities The operating and display module (Fig. 4) permits simple oper- ation without supplementary equipment. It is not necessary to open the housing. The individual functio…

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