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Summary of Contents for GESTRA NRS 1-8
- Page 1 GESTRA Steam Systems NRS 1- 8 English Installation Instructions 818612-03 Level Switch NRS 1-8...
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Page 2: Table Of Contents
ATEX (Atmosphère Explosible) .........................4 Explanatory Notes Scope of supply ............................4 Description .............................4 Function ..............................5 System components ..........................5 Design ..............................5 Technical Data NRS 1-8..............................6 Corrosion resistance ..........................7 Name plate/marking ..........................7 Dimensions .............................8 Component Parts NRS 1-8..............................9 Key ...............................11 Functional Elements NRS 1-8..............................10 Key ...............................11... - Page 3 Contents – continued – Page Commissioning Checking electrical connection ......................16 Applying mains voltage .........................16 Performance Test Water level limiter ..........................16 Operation Water level limiter ..........................17 Notice ..............................17 Operational Malfunctions Fault finding list for troubleshooting ....................17, 18 Decommissioning Danger ..............................18 Disposal..............................18 Annex Declaration of Conformity ........................19...
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Page 4: Important Notes
Important Notes Usage for the intended purpose Use level switch NRS 1-8 only in conjunction with level electrodes NRG 16-12, NRG 17-12, NRG 19-12 for water level limiting (high level alarm). Safety note The equipment must only be installed and commissioned by qualified and competent staff. Retrofitting and maintenance work must only be performed by qualified staff who –... -
Page 5: Function
The equipment combination of electrode NRG 16-12, NRG 17-12 or NRG 19-12 and level switch NRS 1-8 provides fail-safe protection against a first fault, i. e. the system will still continue to provide the safety function even after the occurrence of a first fault. -
Page 6: Technical Data
When using the ancillary unit URN 1 the equipment can also be fed with 24 V DC. Power consumption 5 VA Protection NRS 1-8 IP 40 to EN 60529 Admissible ambient temperature 0 °C to 55 °C Case materials Base: Noryl SE 1-GFN 2 UL 94 VO, black... -
Page 7: Corrosion Resistance
Technical Data – continued – Corrosion resistance If the equipment is used for the intended purpose, its safety is not impaired by corrosion. Name plate/marking Equipment designation Mains voltage Delay of response Sensitivity of response External fuse Fig. 1... -
Page 8: Dimensions
Technical Data – continued – Dimensions Fig. 2 Fig. 3... -
Page 9: Component Parts
Component Parts NRS 1-8 Fig. 4 Fig. 5 Fig. 6... -
Page 10: Functional Elements
Functional Elements NRS 1-8 MAX 55°C MAX 95% IP 65 Fig. 7... -
Page 11: Key
Component Parts / Functional Elements Cover screws Base Upper part of housing Mounting clip Cable entry (flexible) Cable entry (housing) Fixing hole d = 4.3 mm Toggle switch “TEST 2 / INSPECTION” for internal self-checking Red LED “High level alarm” Button “TEST 1”... -
Page 12: Installation
Installation NRS 1-8 On supporting rail (with mounting clip) 1. Clip level switch onto supporting rail. 2. Loosen cover screws 1 and detach cover 3 from base 2. 3. Select cable entry 5 and remove corresponding seal. On mounting panel 1. -
Page 13: Examples Of Installation
Installation – continued – Examples of installation MAX 55°C MAX 95% Fig. 8 IP 65 Fig. 9... -
Page 14: Electrical Connection
URN 1 (24 V DC). Voltage table Use this voltage table as reference when checking the level electrode for malfunctions or submersion. Please observe the wiring diagram for NRS 1-8. Fig. 10, Fig. 11 10 µS/cm 0.5 µS/cm 10 V C=0.3 cm... -
Page 15: Wiring Diagram
Electrical Connection – continued – Wiring diagram Safety circuit Fig. 10 Safety circuit Fig. 11 This wiring diagram is only applicable for France! -
Page 16: Commissioning
Commissioning Checking electrical connection Make sure that the NRS 1-8 and the associated level electrode are wired in accordance with the wiring diagram. Fig. 10, Fig. 11 Applying mains voltage Apply mains voltage to level switch NRS 1-8. Performance test Water level limiter 1. -
Page 17: Operation
Operation Water level limiter Use in conjunction with level switch NRG 1...-12 in steam and pressurised hot water plants in accord- ance with TRD 401, TRD 602, TRD 604, EN 12952, EN 12953 or according to other national regulations. Notice To analyse and eliminate malfunctions refer to section “Fault finding list for troubleshooting”... -
Page 18: Decommissioning
Decommissioning Danger The terminal strips of the NRS 1-8 are live during operation. This presents the danger of electric shock! Cut off power supply before mounting or removing the terminal strips and the housing cover. -
Page 19: Annex
Annex Declaration of Conformity We hereby declare that the equipment NRS 1-8 conforms to the following European guidelines: Low Voltage Directive 73/23/eec version 93/68/eec EMC Directive 89/336/eec version 93/68/eec Low Voltage Standard EN 50178 EMC Standard EN 50081-2, EN 50082-2 This declaration is no longer valid if modifications are made to the equipment without consultation with us. - Page 20 Agencies all over the world: www.gestra.de GESTRA AG Münchener Straße 77 28215 Bremen Germany Telefon +49 421 3503-0 Telefax +49 421 3503-393 E-Mail info@de.gestra.com www.gestra.de 818612-03/09-2009cm (803967-08) · GESTRA AG · Bremen · Printed in Germany...
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