Siemens LU01 instruction manual Measurement Difficulties, Flashing LOE Display

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Troubleshooting

Measurement Difficulties

If a measurement difficulty occurs for greater than the Failsafe Timer (P070) setting, LOE is flashed alternately with the Reading display. Under certain conditions, a measurement difficulty may cause the SITRANS LU01 to lock on to a false echo and report a fixed or wrong reading.

Flashing LOE Display

If LOE is displayed, ensure that the:

1.Material (object) surface monitored is within the maximum range of the transducer.

2.Transducer (P004) value matches the transducer used.

3.Transducer is located and aimed properly.

(See the Transducer manual for maximum range, mounting and rough aiming instructions.)

For optimum performance, adjust the transducer aiming while monitoring the Echo Confidence (P805) for various material levels over the measurement range. When complete, set the transducer aiming at the best angle for all levels.

To display Echo Confidence in the RUN mode:

Press and hold for 4 seconds (Failsafe Time Left changes to the Short : Long Confidence display).

To display Echo Confidence in PROGRAM mode, access the Echo Confidence (P805) parameter.

To update the value displayed after each aiming adjustment...

Press (5 times or more to verify stability)

If the condition persists (despite optimum aiming), optimize transducer performance. (See Enhancement Parameters Short Shot Frequency, P840 and Long Shot Frequency, P841).

Increase the Failsafe Timer (P070) value, if failsafe operation will not be compromised by the larger value.

If LOE is displayed only when a sloped bottom vessel is near Empty, the echo is probably being reflected away from the transducer. Install an empty target plate in the bottom of the vessel. When exposed (not covered by material), the target plate provides the reflective surface representative of an empty vessel.

Install a longer range transducer, enter the new Empty (P006) distance, and (if necessary) optimize aiming and frequency again.

If a longer range transducer is not available, connect an oscilloscope to the SITRANS LU01, (see Enhancement Parameters Scope Displays, P810).

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SITRANS LU01 – INSTRUCTION MANUAL

7ML19985BE02

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Contents Sitrans Manual for agreement with Technical data subject to changeThis document is available in bound version Instrumentation described, variationsTable of Contents Independent Relay Setpoints 100 Page Introduction IntroductionSmartLinx RS-232 or LocalSitrans LU01 Features Programmable FeaturesManual UnitsAmbient temperature SpecificationsSpecifications Installation categoryProgrammer OutputsCable TransducerOptions Refer to associated product documentationSafety marking symbols Manual On Product DescriptionLocation InstallationInstallation Cable/Conduit Entry RequirementsTransducer Types Transducer MountingM 1.65 ft Interconnection Communication Mode LEDSwitchterminal blockboard B RJ-11 port AC ModelDC Model TB1LCD Card Optional SmartLinx ModuleBoard a System Diagram TransducerMA Outputs Temperature SensorRelays To TS-3Level System Synchronization CommunicationSmartLinx SerialDC Supply Wiring PowerAC Supply Wiring Position. SelectUse the hand programmer to change individual parameters Communications AccessProgrammer RJ-11 port RJ-11 cableDisplay Segment ProgrammingDisplay DescriptionProgramming KeypadFunction keys Program Mode Entry Changing ParametersParameters Types Parameter Reset FeaturesProgramming Security Operation Display in RUN ModeOperation Ber Operation Key DescriptionP731 Performance Test Results Point Alarm Indicator RelaySystem Performance Evaluation Operation Level Space or DistanceOperation Helpful Hints Program modeParameter Reference Parameters1954 OFF programming permitted P000 LockSecures the Sitrans LU01 from changes Lated levelP002 Material Quick Start P001 to P007P001 Operation P003 Maximum Process SpeedP004 Transducer Specifies measurement units used for dimensional valuesP005 Units P007 Span P006 EmptySets the range level to be measured Application Parameters Volume P050 to P055 P050 Tank ShapeP051 Maximum Volume ExamplesUniversal Volume Calculation P052 Tank Dimension aP053 Tank Dimension L Dimension a as used in P050 Tank ShapeEntering a Volume Breakpoint Typical volume calculationsEntering a Level Breakpoint P060 Decimal Position Display and Reading P060 to P062P061 Convert Reading Failsafe P070 to P072 P070 Failsafe TimerP062 Offset Reading Once activated, the Failsafe State initiates the following Material level reported when a Failsafe State is initiatedP071 Failsafe Material Level Selecting HI, LO, or HOLdP072 Failsafe Level Advance Relays P100 to P119Relay reaction P100 Preset Applications Option Relay # Point # Standard Alarm as % of Span, P007P103 High High Alarm P101 High AlarmP102 Low Alarm P104 Low Low AlarmFunction Custom Relays P111 to P113P111 Relay Control Function Sets the control algorithm used to trip the relayValues For P111 Control Type Relay Control Independent Relay SetpointsRelays are energized and de-energized Action When P113 Relay OFF Setpoint Distance above and below the bound alarm setpointsP112 Relay on Setpoint P116 Dead BandP129 Relay Failsafe Relay Function P111 Preset P129Independent Relay Failsafe P129 To select an independent Relay Failsafe valueP201 mA Output Function MA Output P200 to P219P200 mA Output Range P203 mA Output Value / TransducerP210 0/4 mA Output Setpoint Independent mA Setpoints P210 and P211MA Output Limits P212 and P213 P211 20 mA Output SetpointP214 4 mA Output Trim MA Output Trim P214 to P215P213 mA Output Max Limit P215 20 mA Output TrimMA Output Failsafe P219 Record Temperatures P300 to P303P300 Temperature, Transducer Maximum Standard Data Logging P300 to P321P330 Profile Record P302 Temperature, Sensor MaximumProfile Records P330 to P337 Code DescriptionP333 Auto Record Interval P331 Auto Record EnableAuto Record on and OFF Setpoints P334 to P337 P336 Auto Record Filling / Emptying P334 Auto Record on SetpointP335 Auto Record OFF Setpoint P337 Auto Record LOE TimeInstallation Records P340 to P342 Range Calibration P650 to P654P651 Sound Velocity Calibration Condition for use of this featureUsing Sound Velocity Calibration Offset CalibrationP653 Velocity Value altered when an Offset Calibration is performedP652 Offset Correction P654 Velocity at 20CView the transducer temperature in C Temperature Compensation P660 to P664P664 Temperature P660 Temp SourceP701 Max Empty Rate Rate P700 to P707P700 Max Fill Rate P003 Value Meters/MinuteP703 Emptying Indicator P702 Filling IndicatorP704 Rate Filter Measurement Verification P710 to P713 P705 Rate Update TimeP706 Rate Update Distance P707 Rate ValueP711 Echo Lock P711 value P712 preset valueP712 Echo Lock Sampling P713 Echo Lock Window P727 Scan DelayTransducer Scanning P725 to P729 P726 Level System SyncP729 Scan Time P728 Shot DelayDisplay P730 to P733 P730 Auxiliary ReadingAdjusts the Point Number display scroll speed P732 Display DelayP733 Scroll Access P731 Auxiliary Reading KeyP740 Peripheral Communications Peripheral Communication Support Parameters P740 to P749SmartLinx Reserved 750 to P748 RS-485 TerminationCommunications P772 SmartLinx Hardware TestingP790 Hardware Error P772 Baud RateEcho Processing P800 to P807 P791 Bus ErrorP792 Bus Error Count P794 SmartLinx Module Type P795 SmartLinx ProtocolP802 Transducer with Submergence Shield P803 Shot / Pulse ModeP801 Range Extension Determines what type of ultrasonic shots are firedDisplay Description P804 Confidence ThresholdP805 Echo Confidence Determines which echoes are evaluated by softwareP807 Noise Advanced Echo Processing P810 to P825P806 Echo Strength Anatomy of an Echo ProfileScrolling Display SymbolP810 Scope Displays ValuesP817 Profile Pointer Time Profile Pointer P817 to P825P816 Echo Time Raw P818 Profile Pointer DistanceP819 Profile Pointer Amplitude P820 AlgorithmP823 Reform Echo P821 Spike FilterP822 Narrow Echo Filter Dampens spikes in the echo profile to reduce false readingsP830 TVT Type Advanced TVT Adjustment P830 to P835P825 Echo Marker Trigger Selects the TVT Curve usedP831 TVT Shaper P832 TVT Shaper AdjustAllows manual adjustment of the TVT curve To change a breakpointP835 TVT Slope Min P833 TVT Start MinP834 TVT Start Duration Range -30 toP840 Short Shot Number Advanced Shot Adjustment P840 to P852Adjust the short shot transmit pulse frequency in kHz P841 Long Shot NumberP845 Long Shot Width P843 Long Shot FrequencyP844 Short Shot Width P850 Short Shot BiasP852 Short Shot Range Test P900 to P913P851 Short Shot Floor P900 Software Revision NumberP904 Keypad P902 WatchdogP903 Display P905 Transmit PulseP907 Programmer Interface P912 Transducer TemperatureP913 Sensor Temperature P910 RelayP921 Material Measurement Measurement P920 to P927P920 Reading Measurement P922 Space MeasurementThis feature resets all parameters to original values P924 Volume MeasurementMaster Reset P999 P927 Distance PercentEcho Processing Technical ReferenceTransmit Pulse Technical ReferenceEcho Processing Displays Scope Displays, P810 Distance CalculationSound Velocity Dolphin Plus DisplayVolume Level Volume CalculationUniversal, Linear P050 = Maximum Process Speed Universal, Curved P050 =Parameter Ment P728 Shot Delay s P803Application Examples P003 ValueExample 1 Level Measurement Material LevelNumber When satisfied with system performance and programmingInstructions Example 2 Space Measurement Material VolumeP051 Max Volume Enter 1457 for 1457 m Description InstructionsP001 P002 P003 P004 P005 P006 P007 P070 No entry required. preset for 20 mA = low level, P001 =P200 MA Range P213 MA Max Limit P219 MA Failsafe Reference Number Communication SupportApplication Assistance TechnicalTechnical Reference Field Name MT-00 Measurement MessageDefinition Temp Percent End Of Message # # = rate alarm = band alarmMT-01 Hold Message Start of message Message type Message Type Point # End Of Message MT-03 Point Not Scanned Start of message STX $02Maintenance MaintenanceUnit Repair and Excluded Liability Symptom Cause Action Troubleshooting GuideTroubleshooting Measurement Difficulties To display Echo Confidence in the RUN modeTo update the value displayed after each aiming adjustment Flashing LOE DisplayFixed Reading Wrong Reading Troubleshooting Name Programming ChartsProgramming Charts P000 Lock GP200 MA Range P201 P116 Bound Alarm Deadband P129 Relay FailsafeP330 Profile Record P331 Auto Record Enable G P332 P202 MA Allocation P203Programming Charts Parameter Advanced Echo Processing 7ml19985BE02