Siemens sitrans PROBE LU Instruction Manual page 5

Appendix E: Technical References ..............................................................................82
Principles of operation ......................................................................................................................82
Blanking Distance ...............................................................................................................................82
TVT (Time Varying Threshold) curves ............................................................................................82
Auto False-Echo Suppression ................................................................................................83
Open Channel Monitoring (OCM) ...................................................................................................84
Failsafe ..................................................................................................................................................85
Chemical compatibility .......................................................................................................................85
Appendix F: Hazardous area installations ..................................................................86
Wiring Details ......................................................................................................................................86
Intrinsically Safe Model ...........................................................................................................86
FM/CSA ........................................................................................................................................87
EU Equivalency .......................................................................................................................... 87
Loop Voltage versus Loop Resistance .................................................................................88
IS Safety Barrier Selection .....................................................................................................88
How to select a passive barrier for SITRANS Probe LU ................................................. 88
PLC Input Modules.................................................................................................................... 89
Passive Shunt Diode Barriers ............................................................................................... 89
Active barriers (repeating barriers)...................................................................................... 89
Product Nameplate ............................................................................................................................90
....................................................................................................................................................... 90
Intrinsically safe connection drawing (FM) ..................................................................................91
Intrinsically safe connection drawing (CSA) ................................................................................92
Instructions specific to hazardous area installations ................................................................93
(Reference European ATEX Directive 94/9/EC, ..................................................................93
Annex II, 1/0/6) ...........................................................................................................................93
Glossary ............................................................................................................................95
Index ..................................................................................................................................99
iii