Siemens SITRANS LG270 Operating Instructions Manual
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Siemens SITRANS LG270 Operating Instructions Manual

Siemens SITRANS LG270 Operating Instructions Manual

Guided wave radar
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Guided Wave Radar
SITRANS LG270
Modbus and Levelmaster protocol
Rod and cable probe
Operating Instructions • 03/2014

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Summary of Contents for Siemens SITRANS LG270

  • Page 1 Guided Wave Radar SITRANS LG270 Modbus and Levelmaster protocol Rod and cable probe Operating Instructions • 03/2014...
  • Page 2 SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 3: Table Of Contents

    Set up with the quick setup ..................... 56 Saving the parameter adjustment data ................61 Diagnostics and service Maintenance ........................62 Diagnosis memory ......................62 Status messages ......................63 Rectify faults ........................67 Exchanging the electronics module ................69 PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 4 10.6 Configuration of typical Modbus hosts ................95 10.7 Dimensions ........................100 Safety instructions for Ex areas Please note the Ex-specific 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 SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 5: About This Document

    This arrow indicates a single action. 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-51041066 SITRANS LG270 - 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 LG270 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: Namur Recommendations

    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 certified according to DIN EN ISO 14001. Please help us fulfill this obligation by observing the environmental instructions in this manual: • Chapter "Packaging, transport and storage" • Chapter "Disposal" PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 8: Product Description

    • The Modbus electronics for power supply and communication with the Modbus-RTU • The sensor electronics for the actual measuring tasks Fig. 2: Position of Modbus and sensor electronics Modbus electronics Sensor electronics SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 9: Principle Of Operation

    – Supplementary instructions manual "Plug connector for con- tinuously measuring sensors" (optional) – Ex-specific "Safety instructions" (with Ex versions) – if necessary, further certificates Principle of operation The SITRANS LG270 is a level sensor with cable or rod probe for Application area continuous level or interface measurement, particularly suitable for applications in high temperatures up to +450 °C (842 °F). Functional principle -...
  • Page 10 Functional principle - in- High frequency microwave impulses are guided along a steel cable or terface measurement rod. Upon reaching the product surface, a part of the microwave im- pulses is reflected. The other part passes through the upper product and is reflected by the interface. The running times to the two product layers are processed by the instrument. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 11 Example: upper medium dielectric constant 2, lower medium at least dielectric constant 12. Gas phase (L3) • Air or gas mixture • Gas phase - dependent on the application, gas pahse does not always exist (d2 = 0) PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 12: Packaging, Transport And Storage

    Ex-d double chamber housing. 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. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 13 Curved segments: 100 x 100 mm (3.94 … 3.94 in) You can find further information in the operating instructions manual "Rod extension SITRANS series LG". Spacer If you mount the SITRANS LG270 in a bypass tube or standpipe, you have to avoid contact to the bypass tube by using a spacer at the probe end. You can find additional information in the operating instructions manual "Centering".

  • Page 14: Mounting

    Active measuring component • Process fitting • Process seal Process conditions are particularly: • Process pressure • Process temperature • Chemical properties of the medium • Abrasion and mechanical influences You can find the specifications of the process conditions in chapter "Technical data" as well as on the type label. SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 15: Mounting Instructions

    Mounting instructions Installation position Mount SITRANS LG270 in such a way that the distance to vessel installations or to the vessel wall is at least 300 mm (12 in). In non- metallic vessels, the distance to the vessel wall should be at least 500 mm (19.7 in). During operation, the probe must not touch any installations or the vessel wall.
  • Page 16 In such cases, always carry out a false signal suppression after instal- lation. You can find further information under "Setup procedure". _ < DN40 ... DN150 _ < > DN150 ... DN200 Fig. 7: Mounting socket When welding the socket, make sure that the socket is flush with the vessel top. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 17 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. Fig. 9: Mounting of the sensor with inflowing medium Measuring range The reference plane for the measuring range of the sensors is the sealing surface of the thread or flange. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 18 If durability is no problem, then we recommend the use of metal standpipes. When the SITRANS LG270 is used in standpipes or bypass tubes, contact with the tube wall must be avoided. We recommend for this purpose a cable probe with centering weight.
  • Page 19 Instruments for a temperature range up to 280 °C or up to 450 °C insulation have a distance piece between process fitting and electronics hous- ing. Ths distance piece is used for thermal decoupling of the electron- ics against high process temperatures. Information: The distance piece must only be incorporated up to max. 50 mm (2 in) in the vessel isolation. Only then, a reliable temperature decoupling is guaranteed. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 20 If there is a danger of the rod probe touching the vessel wall, then the probe must be fastened at the bottom end. Keep in mind that below the fastening, a measurement is not possible. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 21 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 "Influence of superimposed gas and pres- sure on accuracy" you can find a table with deviation values in some typical gases or in steam. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 22 The prerequisite is constant temperature and pressure in the vessel. Automatic correction via the reference distance The SITRANS LG270 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.

  • Page 23: Connecting To Power Supply And Bus System

    The cable screens to the power supply unit and to the next distributor must be connected to each other and also connected to ground potential via a ceramic capacitor (e.g. 1 nF, 1500 V). The low frequency potential equalisation currents are thus suppressed, but the protective effect against high frequency interference signals remains. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 24: Connecting

    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. 14: Connection steps 5 and 6 - Single chamber housing SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 25 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 finished. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 26: Wiring Plan

    The connection of an external display and adjustment unit is not pos- sible with this double chamber housing. Terminal compartment MODBUS power supply off on Fig. 18: Terminal compartment USB interface 2 Slide switch for integrated termination resistor (120 Ω) Voltage supply Modbus signal SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 27: Double Chamber Housing With Dis-Adapt

    Fig. 20: View to the plug connector M12 x 1 Pin 1 Pin 2 Pin 3 Pin 4 Contact pin Colour connection ca- Terminal, electronics ble in the sensor module Pin 1 Brown Pin 2 White Pin 3 Blue Pin 4 Black PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 28: Supplementary Electronics

    Second current output (II) - Voltage supply and signal output (without HART) Ground terminal for connection of the cable screen Switch-on phase After SITRANS LG270 is connected to the bus system, the instrument carries out a self-test for approx. 30 seconds. The following steps are carried out: •...

  • Page 29: Set Up The Sensor With The Display And Adjustment Module

    The display and adjustment module is powered by the sensor, an ad- ditional connection is not necessary. Fig. 22: Insertion of the display and adjustment module Note: If you intend to retrofit the instrument with a display and adjustment module for continuous measured value indication, a higher cover with an inspection glass is required. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 30: Adjustment System

    [OK] will not be saved. Switch-on phase After switching on, the SITRANS LG270 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 31: Parameter Adjustment - Quick Setup

    Level measurement Medium - dielectric constant In this menu item, you can define the type of medium (product). Max. adjustment In this menu item, you can enter the max. adjustment for the level. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 32 Min. adjustment - Interface Carry out the min. adjustment for the interface. To do this, enter the percentage value and the suitable distance value in m for the empty vessel. SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 33: 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: Setup: Settings, e.g. medium, application, vessel, adjustment, damp- ing, device units, unit SV 2, false signal suppression, linearization Display: Language setting, settings for the measured value indication as well as lighting PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 34 In this menu item you can enter the probe length or have the length determined automatically by the sensor system. When choosing "Yes", then the probe length will be determined automatically. When choosing "No", you can enter the probe length manually. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 35 This menu item is only available, if you have chosen interface meas- phase urement under the menu item "Application". In this menu item you can enter if there is a superimposed gas phase in your application. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 36 Setup - Min. adjustment In this menu item you can enter the min. adjustment for the level. With Level interface measurement this is the minimum total level. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 37 This menu item is only available if you have selected interface meas- Interface urement under the menu item "Application". If you have selected "Yes" in the previous menu item (accept adjustment of the level measure- ment), the current setting will be displayed. If you have selected "No", you can enter the adjustment for the inter- face measurement separately. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 38 For the socket correction you have to enter the height of the socket above the upper edge of the vessel. If the socket is lower than the up- per edge of the vessel, this value can also be negative. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 39 Since scaling is very extensive, scaling of the level value was divided into two menu items. Setup - Scaling Level 1 In menu item "Level 1" you define the scaling variable and the scaling unit for the level value on the display, e.g. volume in l. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 40 0 % and 100 %. In menu item"Current output, size" you determine which measured Setup - Current output Size value the current output refers to. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 41 In menu item"Current output 2" you specify which measured value the additional current output refers to. The procedure corresponds to the previous settings of the standard current output. See "Setup - Current output". PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 42 This should be done with the lowest possible level so that all potential interfering reflections can be detected. Proceed as follows: Enter the actual distance from the sensor to the product surface. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 43 In the main menu point "Display", the individual submenu points should be selected subsequently and provided with the correct parameters to ensure the optimum adjustment of the display options. The procedure is described in the following. The following submenu points are available: PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 44 The optionally integrated background lighting can be adjusted via the adjustment menu. The function depends on the height of the supply voltage, see "Technical data". The lighting is switched off in delivery status. Diagnostics - Device In this menu item, the device status is displayed. status SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 45 The respective min. and max. measured values are saved in the Additional 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-51041066 SITRANS LG270 - Operating Instructions...
  • Page 46 Select the requested simulation size and adjust the requested value. Caution: During simulation, the simulated value is outputted as 4 … 20 mA cur- rent value and digital HART signal. Push the [ESC] key to deactivate the simulation. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 47 "Lock/Release setup/ adjustment". In delivery status, the PIN is "0000". Additional adjustments - In this menu item, the internal clock of the sensor is adjusted. Date Time PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 48 Max. adjustment - Level 100 % Max. adjustment - Level Distance: 0.000 m(d) - note block- ing distances Min. adjustment - Level Min. adjustment - Level Distance: Probe length - take dead band into account Accept adjustment of the level measurement? SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 49 0 … 100 % correspond to 4 … 20 mA Current output 2 - Reaction in case of failure ≤ 3.6 mA Current output - Min. 3.8 mA Current output - Max. 20.5 mA Third HART variable (TV) Measurement certainty, level Fourth HART variable (QV) Electronics temperature PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 50 • Read from sensor: Read data from sensor and store into the display and adjustment module • Write into sensor: Store data from the display and adjustment module back to the sensor SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 51 63 must be assigned to each sensor. If you select the function "Analogue current output" and also enter an address number, you can output a 4 … 20 mA signal in Multidrop mode. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 52: Saving The Parameter Adjustment Data

    The procedure is described in the operating instructions manual "Display and adjustment module" in the menu item "Copy sensor data". The data remain there permanently even if the sensor power supply fails. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 53 If it is necessary to exchange a sensor, the display and adjustment module is inserted into the replacement instrument and the data are likewise written into the sensor via the menu item "Copy sensor data". PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 54: Setting Up Sensor And Modbus Interface With Pactware

    Interface adapter Sensor To the Modbus electron- The connection of the PC to the Modbus electronics is carried out via a USB cable. Scope of the parameter adjustment: • Sensor electronics • Modbus electronics SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 55: Parameter Adjustment With Pactware

    Parameter adjustment with PACTware Prerequisites For parameter adjustment of the sensor via a Windows PC, the configuration software PACTware and a suitable instrument driver (DTM) according to FDT standard are required. The available DTMs are compiled on a DVD. The DTMs can also be integrated into other frame applications according to FDT standard. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 56: Set Up With The Quick Setup

    The quick setup is another option for parameter adjustment of the sensor. It allows fast, convenient adjustment of the most important parameters to adapt the sensor quickly to standard applications. To use it, select the function "Quick setup" in the start screen. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 57 Extended adjustment Maintenance Quick setup With quick setup you can carry out the parameter adjustment of SITRANS LG270 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 58 Measurement loop name Here you can enter a suitable measurement loop name for your SITRANS LG270. You can enter a name with max. 19 characters. You can use capital and small letters as well as numbers. The following special characters are also possible: + - . : , ( ) / < >...
  • Page 59 The entered value refers to the distance from the sealing surface of the process fitting (sensor reference plane) to the total level or interface. Step 4 Linearization is required if the measured value should be outputted Linearization in proportion to the volume and not the level. The linearization acts PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 60 This procedure can last several minutes. Create instrument documentation? This function is used to print or create a PDF file of the current param- eter adjustment. To read the PDF file, you need a suitable program (for example Acrobat Reader). To print or create the PDF file, all data are downloaded from the device. For this function, the full version of the DTM Collection is required. This procedure can last several minutes. SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 61: Saving The Parameter Adjustment Data

    PIN is entered again. Saving the parameter adjustment data We recommend documenting or saving the parameter adjustment data via PACTware. That way the data are available for multiple use or service purposes. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 62: Diagnostics And Service

    Echo curve of the setup: This is used as reference echo curve for the measurement conditions during setup. Changes in the measure- ment conditions during operation or buildup on the sensor can thus be recognized. The echo curve of the setup is stored via: • PC with PACTware/DTM • Control system with EDD SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 63: Status Messages

    PACTware/DTM or EDD. Out of specification: The measured value is unstable because the instrument specification is exceeded (e.g. electronics temperature). This status message is inactive by default. It can be activated by the user via PACTware/DTM or EDD. Maintenance: Due to external influences, the instrument function is limited. The measurement is affected, but the measured value is PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 64 3 min. F113 – Error in the internal – Disconnect operating Bit 7 instrument communi- voltage briefly Communi- cation – Send instrument for cation error repair SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 65 – Wait for the automatic end Simulation ac- after 60 mins. tive Out of specification The following table shows the error codes and text messages in the status message "Out of specification" and provides information on causes as well as corrective measures. PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 66 – Clean the antenna – Change polarisation direc- tion – Use instrument with higher sensitivity M504 – Hardware defect – Check connections – Exchanging the electronics Error on an device inter- – Send instrument for repair face SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 67: Rectify Faults

    22 mA or less sensor defec- than 3.6 mA tive Treatment of measure- The below tables show typical examples for application-relevant ment errors measurement errors. There are two measurement errors: PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 68 – Echo from the probe end larger – Check parameter "Medium" mains in the area of the than the product echo, for and "Vessel height", adapt if bottom during filling example, with products with necessary ε < 2.5 oil-based, solvents, etc. time SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 69: Exchanging The Electronics Module

    The electron- ics modules are adapted to the respective sensor and differ in signal output or voltage supply. The new electronics module must be loaded with the default settings of the sensor. These are the options: PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 70: Exchange Or Shorten Cable/Rod

    Make sure that the two components of the double washer remain together. 4. Screw the new rod and the new cable manually to the thread on the process fitting. 5. Exert counterforce with the second fork spanner and tighten the or or cable on the flat surfaces with a torque of 20 Nm (15 lbf ft). SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 71 6. Cable with gravity weight: Shift the cable according to the drawing into the gravity weight 7. Cable with gravity weight: Fasten cable with the pins, torque 7 Nm (5.16 lbf ft) Cable with centering weight: Fasten cable with the pins, torque 7 Nm (5.16 lbf ft) and fix the clamping part on the centering weight. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 72: Software Update

    Instruments with approvals can be bound to certain software ver- sions. Therefore make sure that the approval remains effective with a software update. You can find detailed information in the download area on our home- page: www.siemens.com/sitranslg. How to proceed if a repair is needed If it is necessary to repair the instrument, please contact Sie- mens Milltronics Process Instruments. You find the locations on "www.siemens.com/sitranslg". SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 73: Dismounting

    Pass the instrument directly on to a spe- cialised recycling company and do not use the municipal collecting points. These may be used only for privately used products according to the WEEE directive. PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 74: Supplement

    Borosilicate glass GPC 540 Ʋ Contacts Alloy C22 Ʋ Helium leak rate < 10 mbar l/s Ʋ Pressure resistance See process pressure of the sensor Ohmic contact Between ground terminal, process fitting and probe Process fittings Ʋ Pipe thread, cylindrical (ISO 228 T1) G1½ according to DIN 3852-A SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 75 Torque for process fitting, thread Ʋ -196 … +280 °C (-321 … +536 °F) max. 450 Nm (332 lbf ft) Ʋ -196 … +450 °C (-321 … +842 °F) max. 400 Nm (295 lbf ft) Torque for exchangeable cable or rod probe (in the process fitting) Ʋ Cable: ø 2 mm (0.079 in) 20 Nm (14.75 lbf ft) Ʋ Cable: ø 4 mm (0.157 in) 20 Nm (14.75 lbf ft) Ʋ Rod: ø 16 mm (0.63 in) 20 Nm (14.75 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) PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 76 ε ≥ 1.6 Ʋ Rod probes ε ≥ 1.6 Fig. 42: Measuring ranges - SITRANS LG270 Reference plane Probe length L Measuring range (default setting refers to the measuring range in water) Upper dead band (see diagrams under Accuracy - grey section)
  • Page 77 0,015 m (3.15") (11.811") (0.591") Fig. 43: Deviation SITRANS LG270 in rod version in water Dead band - no measurement possible in this area Probe length With interface measurement = 2.0 Depending on the installation conditions, there can be deviations which can be rectified with an adaptation of the adjustment or a change of the measured value offset in the DTM service mode The dead bands can be optimizes by a false signal suppression.
  • Page 78 0,15 m 0,2 m 0,05 m (5.906") (7.874") (1.968") 0,05 m (1.968") Fig. 44: Deviation SITRANS LG270 in rod version in oil Dead band - no measurement possible in this area Probe length 15 mm (0.591 ") 2 mm (0.079 ")
  • Page 79 " ") (3.937 0,08 m ") (3.15 ") Fig. 46: Deviation SITRANS LG270 in cable version 2 mm (0.079 in), in oil Dead band - no measurement possible in this area Probe length 25 mm (0.984") 2 mm (0.079") -2 mm (-0.079")
  • Page 80 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). SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 81 Fig. 49: Ambient temperature - process temperature (version -196 … +450 °C/-321 … +842 °F) Ambient temperature Process temperature (depending on the seal material) Maximum permissible temperature - standard Limited temperature range - plastic housing and stainless steel housing, electropolished PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 82 Fig. 51: Process pressure - process temperature (version -196 … +450 °C/-321 … +842 °F) Process temperature (depending on the seal material) Process pressure Vibration resistance Ʋ Instrument housing 4 g at 5 … 200 Hz according to EN 60068-2-6 (vibration with resonance) Ʋ Rod probe 1 g with 5 … 200 Hz according EN 60068-2-6 (vibration at resonance) with rod length 50 cm (19.69 in) SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 83 Measurement electronics temerature Resolution 1 °C (1.8 °F) Accuracy ±1 °C (1.8 °F) Voltage supply Operating voltage 8 … 30 V DC Power consumption < 500 mW Interpolation protection Integrated Electrical protective measures Protection, depending on housing version Ʋ Plastic housing IP 66/IP 67 (NEMA 4X) PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 84: Basics Modbus

    120 Ohm. The resistor is already integrated in the SITRANS LG270 and is activated/deactivated via a slide switch. The prerequisites for maintaining the protection rating are a suitable cable as well as correct mounting.
  • Page 85 Fig. 52: Bus architecture Modbus Connection resistor Bus participant Voltage supply Protocol description The SITRANS LG270 is suitable for connection to the following RTUs with Modbus RTU or ASCII protocol. Protocol ABB Totalflow Modbus RTU, ASCII Bristol ControlWaveMicro Modbus RTU, ASCII...

  • Page 86: Modbus Register

    General configuration of the host The data exchange with status and variables between field device and host is carried out via register. For this, a configuration in the host is required. Floating point numbers with short prevision (4 bytes) according to IEEE 754 are transmitted with individually selectable order of the data bytes (byte transmission order). This "Byte transmission order" is determined in the parameter "Format Code". Hence the RTU knows the registers of the SITRANS LG270 which must be contacted for the variables and status information. Format Code Byte transmission order ABCD...
  • Page 87 2006 DWord Third Variable in Byte Order ABCD (Big Endian) 2008 DWord Quarternary Variable in Byte Order ABCD (Big En- dian) Status 2100 DWord See Register 100 2102 DWord Primary Variable in Byte Order DCBA (Little Endian) 2104 DWord Secondary Variable in Byte Order DCBA (Little En- dian) 2106 DWord Third Variable in Byte Order ABCD DCBA (Little En- dian) 2108 DWord Quarternary Variable in Byte Order DCBA (Little En- dian) Status 2200 DWord See Register 100 PBD-51041066 SITRANS LG270 - Operating Instructions...

  • Page 88: Modbus Rtu Commands

    Request: Parameter Length Code/Data Function Code 1 Byte 0x03 Start Address 2 Bytes 0x0000 to 0xFFFF Number of Registers 2 Bytes 1 to 127 (0x7D) Response: Parameter Length Code/Data Function Code 1 Byte 0x03 SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 89 Number of Registers 2 Bytes Data Response: Parameter Length Code/Data Function Code 1 Byte 0x04 Start Address 2 Bytes Register Value 2 Bytes Data FC8 Diagnostics With this function code different diagnostic functions can be triggered or diagnostic values read out. Request: Parameter Length Code/Data Function Code 1 Byte 0x08 PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 90 2 Bytes 0x0000 to 0xFFFF Data 2 Bytes 0x01 to 0x7B FC17 Report Slave ID With this function code, the Slave ID can be queried. Request: Parameter Length Code/Data Function Code 1 Byte 0x11 SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 91: Levelmaster Commands

    List of Object value 1 Byte Depending on the Object ID 10.5 Levelmaster commands The SITRANS LG270 is also suitable for connection to the following RTUs with Levelmaster proto- col. The Levelmaster protocol is often called "Siemens" "Tank protocol". Protocol ABB Totalflow...
  • Page 92 Level in inches is repeated for sensors with 2 levels. PV value is transmitted as first measured value, SV as second measured value. PV, SV, TV and QV can be adjusted via the sensor DTM. Report Unit Number Request: Parameter Length Code/Data Report Unit Number 5 characters ASCII U**N? SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 93 UuuBbbbb[b][pds] Bbbbb[b] = 1200, 9600 (default) pds = parity, data length, stop bit (optional) parity: none = 81, even = 71 (de- fault), odd = 71 Response: Parameter Length Code/Data Set Baud Rate 11 characters ASCII Example: U01B9600E71 Change instrument on address 1 to baudrate 9600, parity even, 7 data bits, 1 stop bit PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 94 Response: Parameter Length Code/Data Report Receive to Transmit Delay 7 characters ASCII UuuRmmm mmm = milliseconds (50 up to 250), default = 127 ms Error codes Error Code Name EE-Error Error While Storing Data in EEPROM FR-Error Erorr in Frame (too short, too long, wrong data) LV-Error Value out of limits SITRANS LG270 - Operating Instructions PBD-51041066...

  • Page 95: Configuration Of Typical Modbus Hosts

    10.6 Configuration of typical Modbus hosts Fisher ROC 809 Wiring plan (Rx/Tx -) (Rx/Tx +) +30 Vdc Fig. 53: Connection of SITRANS LG270 to RTU Fisher ROC 809 SITRANS LG270 RTU Fisher ROC 809 Voltage supply Parameter Parameter Value Baud Rate 9600 Floating Point Format Code...
  • Page 96 ABB Total Flow Wiring plan Bus + Bus - VBAT Fig. 54: Connection of SITRANS LG270 to RTU ABB Total Flow SITRANS LG270 RTU ABB Total Flow Parameter Parameter Value Baud Rate 9600 Floating Point Format Code RTU Data Type...
  • Page 97 Thermo Electron Autopilot Wiring plan Rx - +30 Vdc Fig. 55: Connection of SITRANS LG270 to RTU Thermo Electron Autopilot SITRANS LG270 RTU Thermo Electron Autopilot Voltage supply Parameter Parameter Value Baud Rate 9600 Floating Point Format Code RTU Data Type...
  • Page 98 3 TX- 4 GND 5 RXT 6 TXT 7 not used 8 not used +30 Vdc Fig. 56: Connection of SITRANS LG270 to RTU Bristol ControlWave Micro SITRANS LG270 RTU Bristol ControlWave Micro Voltage supply Parameter Parameter Value Baud Rate...
  • Page 99 ScadaPack Wiring plan COM Part 3 (C3) RS485 TXD- TXD+ +30 Vdc Fig. 57: Connection of SITRANS LG270 to RTU ScadaPack SITRANS LG270 RTU ScadaPack Voltage supply Parameter Parameter Value Baud Rate 9600 Floating Point Format Code RTU Data Type...

  • Page 100: Dimensions

    10.7 Dimensions Housing ~ 81 mm (3.19") ø 77 mm (3.03") M16x1,5 M20x1,5/ ½ NPT Fig. 58: Dimensions housing - with integrated display and adjustment module the housing is 9 mm/0.35 in higher SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 101 (0.79") (0.79") Fig. 59: SITRANS LG270, threaded version with gravity weight (all gravity weights with thread M8 for eye-bolt) Sensor length, see chapter "Technical data" Cable ø 4 mm (0.157 in), temperature version -196 … +280 °C (-321 … 536 °F) Cable ø...
  • Page 102 ø 4 mm (0.08") (0.16") (0.16") (0.08") Fig. 60: SITRANS LG270, threaded version with centering weight Sensor length, see chapter "Technical data" ø 40 mm (1.57 in) ø 45 mm (1.77 in) ø 75 mm (2.95 in) ø 95 mm (3.74 in) Cable ø...
  • Page 103 ø 16 mm (0.63") (0.63") Fig. 61: SITRANS LG270, threaded version Sensor length, see chapter "Technical data" Rod ø 16 mm (0.63 in), temperature version -196 … +280 °C (-321 … 536 °F) Rod ø 16 mm (0.63 in), temperature version -196 … +450 °C (-321 … 842 °F) Max.
  • Page 104 10.8 Trademark All the brands as well as trade and company names used are property of their lawful proprietor/ originator. SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 105 Replacement parts Error codes 65 – Electronics module 13 Event memory 62 – Electronics module, Modbus 13 – Rod extension 13 – Spacer 13 Factory calibration date 52 Reset 48 False signal suppression 42 Fault rectification 67 PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 106 Scaling measured value 39, 40 Sensor characteristics 52 Sensor status 44 Simulation 46 Special parameters 51 Status messages - NAMUR NE 107 63 Type label 8 Type of medium 35 Units 34 Vessel insulation 19 SITRANS LG270 - Operating Instructions PBD-51041066...
  • Page 107 Notes PBD-51041066 SITRANS LG270 - Operating Instructions...
  • Page 108 For more information www.siemens.com/level www.siemens.com/weighing Siemens AG Subject to change without prior notice Industry sector PBD-51041066 Rev. 1.0 1954 Technology Drive P.O. Box 4225 © Siemens AG 2014 Peterborough. ON Canada K9J7B1 PBD-51041066 email: techpubs.smpi@siemens.com Printed in Canada www.siemens.com/processautomation...

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