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Siemens SITRANS LG250 Operating Instructions Manual

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Guided Wave Radar
SITRANS LG250
Two-wire 4 ... 20 mA/HART
Coax probe
Operating Instructions • 01/2020

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Summary of Contents for Siemens SITRANS LG250

  • Page 1 Guided Wave Radar SITRANS LG250 Two-wire 4 … 20 mA/HART Coax probe Operating Instructions • 01/2020...
  • Page 2 SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 3: Table Of Contents

    Saving the parameterisation data ................... 47 Set up with other systems ....................48 DD adjustment programs ....................48 Field Communicator 375, 475 ..................48 Diagnostics and servicing ....................49 Maintenance ........................49 Diagnosis memory ......................49 PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 4 11.2 Dimensions ........................69 11.3 Trademark ........................72 Safety instructions for Ex areas Take note of the Ex specific safety instructions for Ex applications. These instructions are attached as documents to each instrument with Ex approval and are part of the operating instructions. Editing status: 2020-01-24 SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 5: About This Document

    The dot set in front indicates a list with no implied sequence. Sequence 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. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 6: For Your Safety

    During work on and with the device, the required personal protective equipment must always be worn. Appropriate use SITRANS LG250 is a sensor for continuous level measurement. You can find 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 specifications in the operating instructions manual as well as possible supplementary instructions.

  • Page 7: Eu Conformity

    Installations in the US shall comply with the relevant requirements of the National Electrical Code (ANSI/NFPA 70). Installations in Canada shall comply with the relevant requirements of the Canadian Electrical Code A Class 2 power supply unit has to be used for the installation in the USA and Canada. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 8: Product Description

    Sensor SITRANS LG250 • Optional accessory The further scope of delivery encompasses: • Documentation – Operating instructions SITRANS LG250 – Instructions for optional instrument features – Ex-specific "Safety instructions" (with Ex versions) – If necessary, further certificates Information: Optional instrument features are also described in this operating instructions manual.

  • Page 9: Principle Of Operation

    14 Hardware and software version Principle of operation Application area The SITRANS LG250 is a level sensor with coax probe for continuous level or interface measurement, suitable for applications in liquids. Functional principle - High frequency microwave pulses are guided along a steel cable or level measurement a rod.
  • Page 10 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 SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 11: Packaging, Transport And Storage

    Ascertained transit damage or con- cealed defects must be appropriately dealt with. Storage Up to the time of installation, the packages must be left closed and stored according to the orientation and storage markings on the outside. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 12: Accessories

    The LG Remote Interface is an external display and adjustment unit adjustment unit for sensors with single chamber housing and Ex d double chamber housing. Flanges Screwed flanges are available in different versions according to the following standards: DIN 2501, EN 1092-1, BS 10, ASME B 16.5, JIS B 2210-1984, GOST 12821-80. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 13: Mounting

    Prior to setup you have to replace these protective caps with ap- proved cable glands or close the openings with suitable blind plugs. Note: Process conditions For safety reasons, the instrument must only be operated within the permissible process conditions. You can find detailed information on PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 14: Mounting Instructions

    Fig. 4: Vessel with conical bottom Before beginning the welding work, remove the electronics module Welding work from the sensor. By doing this, you avoid damage to the electronics through inductive coupling. Inflowing medium Do not mount the instruments in or above the filling stream. Make sure that you detect the product surface, not the inflowing product. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 15 If there is a danger of the coaxial probe touching the vessel wall, then the probe must be fastened at the bottom end. Keep in mind that measurement is not possible below the fastening point. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 16 Fig. 6: Fasten the probe Coax probe Retaining sleeve SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 17: Connecting To Power Supply

    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 free openings for the cable glands are therefore covered with red dust protection caps as transport protection. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 18: Connecting

    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 gland and remove blind plug 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 SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 19: Wiring Plan, Single Chamber Housing

    10. Reinsert the display and adjustment module, if one was installed 11. Screw the housing lid back on The electrical connection is finished. Wiring plan, single chamber housing The following illustration applies to the non-Ex, Ex-ia and Ex-d ver- sion. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 20: Wiring Plan, Double Chamber Housing

    The following illustration applies to the non-Ex, Ex-ia and Ex-d ver- sion. Electronics compartment 4...20mA 6 7 8 Fig. 9: Electronics compartment - double chamber housing Internal connection to the connection compartment For display and adjustment module or interface adapter SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 21: Wiring Plan, Ex-D-Ia Double Chamber Housing

    For display and adjustment module or interface adapter Internal connection to the plug connector for external display and adjust- ment unit (optional) Note: HART multidrop mode is not possible when using an Ex-d-ia instru- ment. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 22: Supplementary Electronics

    PC • The output signal jumps briefly to the set fault current Then the actual measured value is output to the signal cable. The value takes into account settings that have already been carried out, e.g. default setting. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 23: Set Up With The Display And Adjustment Module

    Fig. 14: Insertion of the display and adjustment module with single chamber housing Note: If you intend to retrofit the instrument with a display and adjustment module for continuous measured value indication, a higher lid with an inspection glass is required. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 24: Adjustment System

    [OK] will not be saved. Switch-on phase After switching on, the SITRANS LG250 carries out a short self-test where the device software is checked. The output signal transmits a fault signal during the switch-on phase. The following information is displayed on the display and adjustment module during the startup procedure: •...

  • Page 25: Parameter Adjustment - Quick Setup

    False signal suppression You can find the description of the individual menu items in the follow- ing chapter "Parameter adjustment - Extended adjustment". Parameter adjustment - Extended adjustment For technically demanding measuring points, you can carry out extended settings in "Extended adjustment". Main menu The main menu is divided into five sections with the following func- tions: PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 26 You can enter names with max. 19 characters. The character set comprises: • Capital letters from A … Z • Numbers from 0 … 9 • Special characters + - / _ blanks Units In this menu item you select the distance unit and the temperature unit. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 27 Application - Medium, In this menu item, you can define the type of medium (product). dielectric constant This menu item is only available if you have selected level measure- ment under the menu item "Application". You can choose between the following medium types: PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 28 In this menu item you can enter the max. adjustment for the level. With interface measurement this is the maximum total level. Adjust the requested percentage value with [+] and store with [OK]. Enter the appropriate distance value in m (corresponding to the percentage value) for the full vessel. The distance refers to the sensor SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 29 Enter the respective distance value in m for the surface of the upper medium corresponding to the percentage value. Min. adjustment interface This menu item is only available if you have selected interface meas- urement under the menu item "Application". PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 30 In the following, you have to enter the values for your vessel, for example the vessel height and the socket correction. For non-linear vessel forms, enter the vessel height and the socket correction. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 31 In the menu item "Current output Min./Max.", you determine the reac- tion of the current output during operation. The default setting is min. current 3.8 mA and max. current 20.5 mA. False signal suppression The following circumstances cause interfering reflections and can influence the measurement: • High mounting sockets PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 32 This is useful if the saved false signal suppression no longer matches the metrological conditions in the vessel. Lock/Unlock adjustment In the menu item "Lock/unlock adjustment", you can protect the sen- sor parameters against unauthorized or inadvertent modification. The PIN is activated/deactivated permanently. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 33 The submenu points are described below. Menu language This menu item enables the setting of the requested national lan- guage. In delivery status, the sensor is set to English. Displayed value 1 In this menu item, you define the indication of the measured value on the display. You can display two different measured values. In this menu item, you define measured value 1. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 34 In delivery status, the lighting is switched on. 6.4.3 Diagnostics Sensor status In this menu item, the device status is displayed. When the instrument displays a failure message, you can here get detailed information on the failure reason. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 35 The respective min. and max. measured values are saved in the sensor. The values are displayed in the menu item "Peak values Ad- ditional". This menu item displays the peak values of the electronics tempera- ture as well as the dielectric constant. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 36 During simulation, the simulated value is output as 4 … 20 mA current value and digital HART signal. Push the [ESC] key to deactivate the simulation. Information: The simulation is terminated automatically 60 minutes after the activa- tion of the simulation. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 37 In this menu item, the internal clock of the sensor is set. Reset After a reset, certain parameter adjustments made by the user are reset. Note: After this menu window, the reset process is carried out. No further safety inquiry follows. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 38 Linearisation type Linear Linearisation - Socket correction 0 mm Linearisation - Vessel height Probe length Scaling variable - Level Volume in l Scaling unit - Level Litres Scaling format - Level Without decimal positions SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 39 Menu item Default value 0000 Date Actual date Time Actual time Time - Format 24 hours Probe type Device-specific Copy instrument settings The instrument settings are copied with this function. The following functions are available: PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 40 Since scaling is very extensive, scaling of the level value was divided into two menu items. Scaling level - Scaling In menu item "Scaling variable" you define the scaling variable and prime the scaling unit for the level value on the display, e.g. volume in l. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 41 0 % and 100 %. Current output Since scaling is very extensive, scaling of the level value was divided into two menu items. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 42 In this menu item you gain access to the protected area where you can enter special parameters. In exceptional cases, individual parameters can be modified in order to adapt the sensor to special requirements. Change the settings of the special parameters only after having con- tacted our service staff. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 43: Saving The Parameterisation Data

    In the display and adjust- If the instrument is equipped with a display and adjustment module, ment module the parameter adjustment data can be saved therein. The procedure is described in menu item "Copy device settings". PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 44: Setup With Pactware

    Note: For power supply units with integrated HART resistance (inner resist- ance approx. 250 Ω), there is no additional external resistance neces- sary. Standard Ex separators are often provided with a sufficiently high current limitation resistance. In such cases, the modem can be connected in parallel to the 4 … 20 mA cable. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 45: Parameter Adjustment With Pactware

    Furthermore a tank calculation program as well as a multiviewer for indication and analysis of the saved measured value and echo curves are available. The supplied DVD includes the respective device DTM. How- ever, you can also download the DTM from our homepage www.siemens.com/sitranslg. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 46: Set Up With The Quick Setup

    Extended adjustment Maintenance Quick setup With quick setup you can carry out the parameter adjustment of SITRANS LG250 for your application in just a few simple steps. The assistant-driven adjustment includes the basic settings for simple, reliable setup and commissioning. Information: If the function is inactive, then possibly no instrument is connected.

  • Page 47: Saving The Parameterisation Data

    Click to the button "Quick setup", to start the assistant-driven adjust- ment for a simplified and reliable setup. Saving the parameterisation data We recommend documenting or saving the parameterisation data via PACTware. That way the data are available for multiple use or service purposes. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 48: Set Up With Other Systems

    This software is updated via the Internet and new EDDs are automatically accepted into the device catalogue of this software after they are released by the manufacturer. They can then be transferred to a Field Communicator. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 49: Diagnostics And Servicing

    Up to 500 events are automatically stored with a time stamp in the sensor (non-deletable). Each entry contains date/time, event type, event description and value. Event types are for example: • Modification of a parameter • Switch-on and switch-off times • Status messages (according to NE 107) • Error messages (according to NE 107) The data are read out via a PC with PACTware/DTM or the control system with EDD. PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 50: Status Messages

    Failure: Due to a malfunction in the instrument, a fault message is output. This status message is always active. It cannot be deactivated by the user. Function check: The instrument is being worked on, the measured value is temporarily invalid (for example during simulation). This status message is inactive by default. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 51 5 min. F113 EMC interference Remove EMC influences Bit 12 of Byte 0 … 5 Communica- Transmission error during ex- Exchange 4-wire power supply tion error ternal communication with unit or electronics 4-wire power supply unit PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 52 Level echo in the close range not Reduce level Bit 9 of available Byte 14 … 24 Overfilling 100 % adjustment: Increase value Check mounting socket Remove possible interfering signals in the close range Use coaxial probe SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 53: Rectify Faults

    The operator of the system is responsible for taking suitable meas- tion occurs ures to rectify faults. The first measures are: Fault rectification • Evaluation of fault messages • Checking the output signal • Treatment of measurement errors PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 54 If the output level is constant, the cause could also be the fault setting of the current output to "Hold value". If the level is too low, the reason could be a line resistance that is too high SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 55 Level echo is no longer detected in the Eliminate false signals in the close range ≥ 100 % or 0 m distance close range due to false signals in the Check installation conditions close range. The sensor goes into over- If possible, switch off the function "Over- fill protection mode. The max. level (0 m fill protection" distance) as well as the status message "Overfill protection" are output. time PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 56: Exchanging The Electronics Module

    Internet (see operating instructions "Electronics module"). Caution: All application-specific settings must be entered again. That's why you have to carry out a fresh setup after exchanging the electronics. If you saved the parameter settings during the first setup of the sen- sor, you can transfer them to the replacement electronics module. A fresh setup is then not necessary. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 57: Software Update

    Instruments with approvals can be bound to certain software versions. Therefore make sure that the approval is still effective after a software update is carried out. You can find detailed information in the download area on our home- page: www.siemens.com/sitranslg. How to proceed if a repair is necessary If it is necessary to repair the instrument, please contact Siemens. You find the locations on "www.siemens.com/processautomation". PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 58: Dismount

    Pass the instrument directly on to a specialised recycling company and do not use the municipal collecting points. If you have no way to dispose of the old instrument properly, please contact us concerning return and disposal. SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 59: Supplement

    Ʋ Inspection window in housing cover Plastic housing: Polycarbonate (optional) Metal housing: Glass Ʋ Ground terminal 316L Ʋ Cable gland PA, stainless steel, brass Ʋ Sealing, cable gland Ʋ Blind plug, cable gland Not suitable for hot steam applications. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 60 60 Nm (44 lbf ft) Ʋ Tube: ø 42.2 mm (1.661 in) 300 Nm (221 lbf ft) Torque for NPT cable glands and Conduit tubes Ʋ Plastic housing max. 10 Nm (7.376 lbf ft) Ʋ Aluminium/Stainless steel housing max. 50 Nm (36.88 lbf ft) Input variable Measured variable Level of liquids Min. dielectric constant of the medium ε ≥ 1.4 SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 61 Ʋ for 20 ms after switching on ≤ 10 mA Ʋ for run-up time ≤ 3.6 mA Load Load resistor, see chapter "Voltage supply" The output values can be assigned individually. The indication values can be assigned individually. PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 62 Water/Oil (dielectric constant ~2.0) Ʋ Mounting Probe end does not touch the vessel bottom Sensor parameter adjustment No gating out of false signals carried out The indication values can be assigned individually. With interface measurement = 2.0. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 63 Fig. 23: Measuring ranges - SITRANS LG250 Reference plane Probe length L Measuring range (default setting refers to the measuring range in water) Upper dead zone (see following diagrams - grey section) Lower dead zone (see following diagrams - grey section) Typical deviation - Interface measure- ± 5 mm (0.197 in)
  • Page 64 0,05 m 0,03 m (1.181 " 0,15 m (5.906 " (1.969 ") Fig. 24: Deviation SITRANS LG250 in coaxial version in water Dead zone (no measurement possible in this area) Probe length 10 mm (0.394 ") 5 mm (0.197 ") 2 mm (0.079...
  • Page 65 Ʋ CSA, Ordinary Location -40 … +60 °C (-40 … +140 °F) Process conditions For the process conditions, please also note the specifications on the type label. The lowest value always applies. The measurement error through the process conditions in the specified pressure and temperature range is < 1 %. Time span after a sudden measuring distance change by max. 0.5 m in liquid applications, max 2 m with bulk solids applications, until the output signal has taken for the first time 90 % of the final value (IEC 61298-2). PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 66 -40°C / -40°F Fig. 26: Ambient temperature - process temperature, standard version Ambient temperature Process temperature (depending on the seal material) Aluminium housing Plastic housing Stainless steel housing (precision casting) Stainless steel housing (electropolished) SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 67 5 … 9 mm 6 … 12 mm 7 … 12 mm 10 … 14 mm – ● ● – ● Brass, nickel- ● ● ● – – plated Stainless – ● ● – ● steel PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 68 Electrical protective measures Protection rating Housing material Version Protection acc. to Protection acc. to NEMA IEC 60529 Plastic Single chamber IP66/IP67 Type 4X Double chamber IP66/IP67 Type 4X Galvanic separation between electronics and metal housing parts SITRANS LG250 - Operating Instructions PBD-51041048...

  • Page 69: Dimensions

    ½ NPT M20x1,5/ ½ NPT Fig. 28: Housing versions in protection IP66/IP67 (with integrated display and adjustment module the housing is 9 mm/0.35 in higher) Plastic single chamber Plastic double chamber When used with fulfilled housing protection IEC 61010-1 PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 70 Fig. 30: Housing versions with protection rating IP66/IP68 (0.2 bar), (with integrated display and adjustment mod- ule the housing is 9 mm/0.35 in higher) Stainless steel single chamber (electropolished) Stainless steel single chamber (precision casting) Stainless steel double chamber housing (precision casting) SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 71 G1½, 1½ NPT ø 21,3 mm ø 42,2 mm (0.84") (1.66") Fig. 31: SITRANS LG250, threaded version Sensor length, see chapter "Technical data" Coaxial version ø 21.3 mm (0.839 in) Coaxial version ø 42.2 mm (1.661 in) PBD-51041048 SITRANS LG250 - Operating Instructions...

  • Page 72: Trademark

    11.3 Trademark All the brands as well as trade and company names used are property of their lawful proprietor/ originator. SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 73 Electronics and connection compartment 20 Electronics compartment - double chamber Quick setup 25 housing 20 Error codes 52 Event memory 49 Read out info 43 Repair 57 Reset 37 Factory calibration date 43 False signal suppression 31 PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 74 Scaling measured value 40, 41 Sensor characteristics 43 Sensor status 34 Simulation 36 Special parameters 42 Type label 8 Type of medium 27 Units 26 SITRANS LG250 - Operating Instructions PBD-51041048...
  • Page 75 Notes PBD-51041048 SITRANS LG250 - Operating Instructions...
  • Page 76 For more information www.siemens.com/level www.siemens.com/weighing Siemens Canada Limited Subject to change without prior notice PD PA PI LW PBD-51041048 Rev. 8.0 1954 Technology Drive P.O. Box 4225 © Siemens AG 2020 Peterborough, ON K9J 7B1, Canada email: techpubs.smpi@siemens.com Printed in Canada www.siemens.com/processautomation...

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