2
Contents
Page
Important Notes
Usage for the intended purpose ...............................................................................................................4
Function ..................................................................................................................................................4
Safety note ..............................................................................................................................................4
Directives and Standards
VdTÜV Bulletin “Wasserstand 100” (= Water Level 100) ..........................................................................5
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility) ........................................................5
ATEX (Atmosphère Explosible) .................................................................................................................5
UL/cUL (CSA) Approval ............................................................................................................................5
Note on the Declaration of Conformity / Declaration by the Manufacturer ......................................5
Approvals for Marine Applications ...........................................................................................................5
Technical data
NRS 2-50, NRS 2-51 ...............................................................................................................................6
Scope of supply ......................................................................................................................................7
In control cabinet: Mounting level switch
Dimensions NRS 2-50, NRS 2-51 ............................................................................................................8
Key .........................................................................................................................................................8
Installation in control cabinet ...................................................................................................................8
Name plate / marking .............................................................................................................................9
In control cabinet: Wiring level switch
Wiring diagram for level switch NRS 2-50 .............................................................................................10
Key .......................................................................................................................................................10
Wiring diagram for level switch NRS 2-51 .............................................................................................11
Key .......................................................................................................................................................11
Connecting supply voltage ....................................................................................................................12
Connecting output contacts ...................................................................................................................12
Connecting level electrode, level transmitter .........................................................................................12
Connection for actual-value output .......................................................................................................12
Tools .....................................................................................................................................................12
In the plant: Wiring level electrode / level transmitter
Connecting level electrode, level transmitter .........................................................................................13
