Table of contents
1
Getting Started ...........................................................................................................................................11
1.1
1.2
2
Introduction.................................................................................................................................................15
2.1
2.2
2.3
Document history ...................................................................................................................15
2.4
Product compatibility ..............................................................................................................16
2.5
Checking the consignment.....................................................................................................16
2.6
Security information ...............................................................................................................16
2.7
2.8
Notes on warranty ..................................................................................................................17
3
Safety information.......................................................................................................................................19
3.1
Precondition for use ...............................................................................................................19
3.1.1
3.1.2
Laws and directives................................................................................................................19
3.1.3
3.1.4
3.2
3.3
Use in hazardous areas .........................................................................................................21
4
Description..................................................................................................................................................25
4.1
Area of application .................................................................................................................25
4.2
Structure.................................................................................................................................27
4.3
Nameplate layout ...................................................................................................................28
4.4
Functional principle ................................................................................................................30
4.4.1
Electronics..............................................................................................................................31
4.4.2
Measuring cell ........................................................................................................................32
4.4.2.1
4.4.2.2
4.4.2.3
4.4.2.4
4.4.2.5
4.4.2.6
4.4.2.7
Measuring cell for level ..........................................................................................................38
4.5
System configuration..............................................................................................................38
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC
3