User's Manual

iii
mmmmm
Table of Contents
Appendix C: Maintenance .............................................................................................95
Unit Repair and Excluded Liability ..................................................................................................95
Appendix D: Technical Reference ...............................................................................96
Principles of Operation ......................................................................................................................96
Echo Processing .................................................................................................................................96
Process Intelligence .................................................................................................................96
Time Varying Threshold (TVT) Curves .................................................................................97
Echo Lock ....................................................................................................................................97
Echo Position Detection ..........................................................................................................97
Auto False Echo Suppression ................................................................................................98
Measurement Range .........................................................................................................................98
Near Range ................................................................................................................................98
Far Range ....................................................................................................................................99
Measurement Response ...................................................................................................................99
mA Output .............................................................................................................................................99
Damping ..............................................................................................................................................100
Loss of Echo (LOE) ............................................................................................................................100
Fail-safe Mode ...................................................................................................................................100
Fail-safe Timer .........................................................................................................................101
Fail-safe Material Level .........................................................................................................101
Fail-safe Level ..........................................................................................................................101
Process Pressure/Temperature derating curves .....................................................................102
Horn Antenna .....................................................................................................................................103
Loop power .........................................................................................................................................104
Typical Connection Drawing ................................................................................................104
Allowable operating area of SITRANS LR260 ..................................................................104
Startup Behavior .....................................................................................................................105
Appendix E: Application Example ..............................................................................107
Flour in steel storage vessel, level measurement ....................................................................107
Appendix F: HART Communications .........................................................................109
SIMATIC PDM ...................................................................................................................................109
HART Electronic Device Description (EDD) ................................................................................109
HART Version ...........................................................................................................................109
HART Burst Mode ...................................................................................................................109
HART Multidrop .......................................................................................................................109
HART Communicator 375 Menu Structure ................................................................................110
Supported HART Commands .........................................................................................................113
Universal and Common Practice Commands ..................................................................113
Device Specific Commands ..................................................................................................113
Appendix G: Firmware Revision History ...................................................................114
Glossary ..........................................................................................................................115
Index ................................................................................................................................119
LCD menu structure ......................................................................................................121