Siemens SITRANS LR250 Instruction Manual page 3

Fault Codes ...........................................................................................................................................98
Operation Troubleshooting .............................................................................................................101
Appendix D: Maintenance ...........................................................................................104
Unit Repair and Excluded Liability ................................................................................................104
Appendix E: Technical Reference ..............................................................................105
Principles of Operation ....................................................................................................................105
Echo Processing ...............................................................................................................................105
Measurement Response .......................................................................................................106
Typical Receiver Signal ........................................................................................................ 106
Echo Lock ............................................................................................................................................107
Loss of Echo (LOE) ..................................................................................................................107
Fail-safe Mode ...................................................................................................................................107
Fail-safe Timers .......................................................................................................................107
Fail-safe value ..........................................................................................................................107
Far Range (Range Extension) .........................................................................................................108
False-Echo Suppression .................................................................................................................108
Near Range (Blanking) ..........................................................................................................108
Auto False-Echo Suppression ..............................................................................................108
mA Output ...........................................................................................................................................110
Maximum Process Temperature Chart .....................................................................111
Process Pressure/Temperature derating curves
Horn Antenna or Wave Guide - ANSI Hole Pattern, 150# ............................................113
Horn Antenna or Wave Guide DN Hole Pattern, PN16 ..................................................113
Appendix F: Loop power ..............................................................................................114
Typical Connection Drawing ................................................................................................114
Allowable operating area of SITRANS LR250 ..................................................................114
Curve 1 (General Purpose, Intrinsically Safe, Non-incendive) ....................................114
Curve 2 (Flameproof, Increased Safety, Explosion-proof) ............................................115
Startup Curve ...........................................................................................................................115
Appendix G: Special Applications .............................................................................116
Application Example: Stillpipe ..............................................................................................116
Appendix H: HART Communications ........................................................................117
SIMATIC PDM ...................................................................................................................................117
HART Device Description (DD) ......................................................................................................117
HART Communicator 375 ......................................................................................................118
Supported HART Commands: ........................................................................................................121
Universal and Common Practice Commands ..................................................................121
Device Specific Commands ..................................................................................................121
Appendix L: Software Revision History ....................................................................122
Glossary ..........................................................................................................................123
Index ................................................................................................................................127
LCD menu structure ......................................................................................................130
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