Flowserve NRS 1-51 User Manual

1NRS 1-51Installation Instructions 818955-01 Level SwitchNRS 1-51GESTRA Steam SystemsGESTRA ENEnglish

10Name plate / markingFig. 5Type designationMains voltage/ ProtectionManufacturerWiring diagramSafety noteDisposal noteTechnical Data – continued –

11Fig. 6Dimensions and Functional ElementsNRS 1-51123671 Upper terminal strip2 Lower terminal strip3 Fixing screws (cross recess head screws M3)6

12Safety noteHigh water level alarms are safety devices and must only be installed, wired and commissioned by qualified and competent staff.Retrofitting

13Electrical ConnectionConnection of level electrodeTo connect the level electrode use screened multi-core control cable with a min. conductor size 0

14Electrical Connection – continued – Toolsn Screwdriver for slotted screws, size 3.5 x 100 mm, completely insulated according to

1527161 2 3 4 5 6 7 817 18 19 20 21 22 23 24925102611 12281329143015NRG 1...-51123+ -M 0,5AElectrical Connection – continued – Fig

16ddeeffFig. 8Fig. 9Electrical Connection – continued – Schematic representations of arrangementsKeySteam boiler plants according

17Commissioning ProcedureChecking switchpoint and functionStartActivity Indication FunctionApply mains voltage. All LEDs are illuminated.System is bei

18OperationActivity Indication FunctionLevel electrode exposedGreen LED for level electrode 1 is illuminatedOutput contacts are closed. Signal outpu

19Diagnosis Display 1 and activity Display 2 Fault Remedy LED alarm 1 and diagnosis LED 1 illuminated. Press and hold down key 1.Diagnosis LED 1 flash

2ContentsUsage for the intended purpose ...

20Action against high frequency interferenceShould sporadic failures occur in installations susceptible to faults (e. g. malfunctions due to out-of-ph

21For your Notes

22For your Notes

23For your Notes

24818955-01/12-2009cm (808806-01) · GESTRA AG · Bremen · Printed in GermanyAgencies all over the world:www.gestra.deGESTRA AGP. O. Box10 54 60, D-2805

3Contents – continued – Checking switchpoint and function ...

4ApplicationUsage for the intended purposeThe level switch NRS 1-51 is designed for different electrical conductivities of the boiler water and for co

5Directives and StandardsPressure Equipment Directive (PED) 97/23/ECThe level switch NRS 1-51 in conjunction with level electrode NRG 1...-51 is EC ty

6Functional Safety acc. to IEC 61508Safety characteristics of the subsystem NRG 1...-51 / NRS 1-51The level switch NRS 1-51 is certified acc. to IEC 61

7Functional Safety acc. to IEC 61508 – continued – Determination of the Safety Integrity Level (SIL) for safety-related systemsLev

8NRS 1-51Supply:Mains voltage 24 VDC +/– 20 %, 0.3 A or 100 – 240 VAC +10/–15 %, 47 – 63 Hz, 0.2 AExternal fuse 0.5 A (semi-delay) Power consumption 7

9NRS 1-51 – continued – Further conditions: Water quality (max. admissible electrical conductivity of the boiler water) steam boil