Related Manuals for GESTRA NRG 19-12
Summary of Contents for GESTRA NRG 19-12
- Page 1 GESTRA Steam Systems NRG 16-12 English NRG 17-12 NRG 19-12 Installation Instructions 818626-02 Level Electrode NRG 6-2, NRG 7-2, NRG 9-2...
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Page 2: Table Of Contents
Inhalt Page Important Notes Usage for the intended purpose ......................4 Safety note .............................4 Danger ..............................4 Attention ..............................4 ATEX (Atmosphère Explosible) .........................4 Explanatory Notes Scope of supply ............................5 Description .............................5 Function ..............................6 System components ..........................6 Design ..............................6 Technical Data NRG 6-2, NRG 7-2, NRG 9-2 .......................7 Corrosion resistance ..........................8 Sizing ..............................8 Name plate / marking ..........................8... - Page 3 Contents – continued – Page Electrical Connection NRG 6-2, NRG 7-2, NRG 9-2 .....................9 Optional for NRG 6-2, NRG 7-2, NRG 9-2 ..................9 Wiring diagram .............................20 Voltage table ............................2 Note ..............................2 Tools ..............................2 Commissioning Checking electrical connection ......................2 Applying mains voltage .........................2 Operation High-level alarm ...........................22 Note ..............................22...
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Page 4: Important Notes
Important Notes Usage for the intended purpose Use level electrodes NRG 6-2, NRG 7-2 and NRG 9-2 only in conjunction with level switch NRS -8 for high water-level limiting (MAX alarm). The equipment must not be used in explosion-risk areas. Safety note The equipment must only be installed and commissioned by qualified and competent staff. -
Page 5: Explanatory Notes
Explanatory Notes Scope of supply NRG 16-12 Level electrode NRG 6-2, PN 40 Joint ring 27 x 32, form D, DIN 7603, .430, bright-annealed Disk with set screw (measuring surface extension) – optional Retaining ring – optional... -
Page 6: Function
Explanatory Notes – continued – Function The high water-level limiter comprises a level electrode type NRG ...-2 and a level switch type NRS -8. The level electrode NRG ...-2 consists of a pressure-tight measuring electrode. The electrode is insulated with a plastic sleeve. The high water-level limiter is based on the conductive measuring principle using the electrical conductivity of water for signaling water level. -
Page 7: Technical Data
Technical Data NRG 16-12, NRG 17-12, NRG 19-12 Type approval TÜV · HWS · 08-47 Service pressure NRG 6-2: 32 bar at 238 °C NRG 7-2: 46 bar at 260 °C NRG 9-2: 00 bar at 3 °C Connection ¾" BSP, ISO 228- Materials Sheath: .075, SMn30... -
Page 8: Corrosion Resistance
Technical Data – continued – Corrosion resistance Provided that the equipment is used for its intended purpose, its safety is not impaired by corrosion. Sizing The body must not be subjected to pulsating stress. Welds and flanges of the electrode are designed to withstand dynamic loading (bending and alternating stress). -
Page 9: Dimensions Nrg 6-2, Nrg 7-2
Technical Data – continued – Dimensions NRG 16-12, NRG 17-12 ¾, ISO 228- ¾, ISO 228- Fig. 4 Fig. 5 with without NRG 6-2 NRG 7-2 measuring surface extension measuring surface extension... - Page 10 Technical Data – continued – Dimensions NRG 19-12 ¾, ISO 228- Fig. 6 without NRG 9-2 measuring surface extension...
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Page 11: Design
Design NRG 16-12, NRG 17-12, NRG 19-12 Fig. 7 Fig. 8 ∅ 33 ¾, ISO 228- Fig. 9 Fig. 10... -
Page 12: Functional Elements
Functional Elements NRG 16-12, NRG 17-12, NRG 19-12 Fig. 11... -
Page 13: Optional For Nrg 6-2, Nrg 7-2, Nrg 9-2
Functional Elements – continued – Optional for NRG 16-12, NRG 17-12, NRG 19-12 j k l k Fig. 12 Fig. 13... -
Page 14: Key
Design / Functional Elements – continued – Measuring electrode Bore Spring Electrode tip Grub screw Disk (measuring surface extension) Retaining ring Joint ring 27 x 32, form D, DIN 7603, .430, bright-annealed Seating surface Electrode thread Thermal insulation, provided on site, d = 20 mm (outside of thermal insulation of steam generating unit) "... -
Page 15: Installation
The seating surfaces and threads on the vessel and mounting flange must be accurately machined, Fig. 10 Use GESTRA PN 60 hat flange when applying the equipment in a high-pressure steam boiler. Do not bend the electrode tip when cutting. -
Page 16: Important Notes
45° and that the length of the electrode rod is limited to 000 mm. Fig. 15 If the electrode is installed outdoor, it must be provided with a weather-proof cover supplied by GESTRA. Alternatively the electrode can be provided with a terminal box made from aluminium. -
Page 17: Examples Of Installation
Examples of Installation NRG 16-12, NRG 17-12, NRG 19-12 ¾ DN 50 ≤ 90 ° ∅ 20 Fig. 14 Fig. 15 ¾ ¾ ¾ ≥ DN 20 DN 00 24.5 24.5 ≥ 0 ≥ DN 20 ≤ 90° ∅ 20 Fig. -
Page 18: Key
Examples of Installation – continued – Flange PN 40, PN 63, PN 60, DN 50, DIN 250- (single electrode) Flange PN 40, PN 63, PN 60, DN 00, DIN 250- (for 2 electrodes installed in one flange) For the approval of the boiler standpipe the relevant regulations must be considered. Vent hole Provide bore as close as possible to the boiler wall! High water HW... - Page 19 " 0. Put upper part of the terminal box onto the level electrode and fix it firmly with screw Optional for NRG 16-12, NRG 17-12, NRG 19-12 Wiring via terminal box made from aluminium. Screened four-core cable, e. g. I-Y(St)Y 2 x 2 x 0.8 or LIYCY 4 x 0.5 mm² is required for wiring the electrode.
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Page 20: Wiring Diagram
Electrical Connection – continued – Wiring diagram Safety chain Fig. 18 Fig. 19 Safety chain Fig. 20 This wiring diagram is only valid for France. -
Page 21: Voltage Table
Electrical Connection – continued – Voltage table Use this voltage table as a reference when checking whether the level electrode is submerged or if there is a malfunction. Please take the wiring diagram of the electrode NRS -8 into account. Fig. -
Page 22: Operation
Operation High-level alarm Operation in combination with controller NRS -8 in steam and pressurised hot water plants to TRD 40, TRD 602, TRD 604, EN 2952, EN 2953 or other national regulations. Note Should malfunctions occur during the commissioning procedure refer to chapter “Operational Malfunctions”... -
Page 23: Decommissioning
Decommissioning Danger Risk of severe burns and scalds to the whole body! Before removing the level electrode make sure that the vessel or measuring pot are depressurised (0 bar) and cooled down to room temperature (20 °C). Disposal Remove the level electrode and separate the waste materials in accordance with the material specification. - Page 24 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 88626-02/409cm · 2003 GESTRA AG · Bremen · Printed in Germany...
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