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Summary of Contents for GESTRA NRG 16-50S
- Page 1 Level Electrode NRG 16-50 S Original Installation Instructions 819013-01 E n g l i s h...
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Page 2: Table Of Contents
Contents Page Important notes Usage for the intended purpose ......................4 Function ..............................4 Safety note ............................. 5 Scope of supply ............................5 Technical data NRG 16-50 S ............................6 Name plate/marking ..........................6 Dimensions NRG 16-50 S ........................7 Installation NRG 16-50 S ............................8 NRG 16-50 S, step 1 ..........................9 NRG 16-50 S, step 2 ..........................9 Tools ...............................9... - Page 3 Contents – continued – Page Commissioning, fault indication and remedy NRG 16-50 S ............................15 Removing and disposing of electrode Danger ..............................15 Removing and disposing of electrode ....................15 Note ..............................15...
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Page 4: Important Notes
Important Notes Usage for the intended purpose The level electrode NRG 16-50 S is used in conjunction with level switch NRS 1-50 (de-energizing delay: 15 seconds) as water-level limiter for steam boilers and (pressurized) hot-water installations on board of seagoing vessels, mobile offshore platforms or river boats. Water level limiters switch off the heating when the water level falls below the set minimum level (low water). -
Page 5: Safety Note
Important Notes – continued – Safety note Water level limiters are safety devices and must only be installed, wired and commissioned by qualified and competent staff. Retrofitting and maintenance work must only be performed by qualified staff who – through adequate training –... -
Page 6: Nrg 16-50 S
Technical data NRG 16-50 S Service pressure PN 40, 32 bar at 238 °C Mechanical connection Flange PN 40, DN 50, DIN 2527, form B Materials Sheath 1.4301, X5 CrNi18-10 Flange 1.0460 / A 105 Screw-in body 1.4571, X6CrNiMoTi17-12-2 Measuring electrode 1.4571, X6CrNiMoTi17-12-2 Electrode tip 1.4401, X5CrNiMo17-12-2 Electrode insulation Gylon ®... -
Page 7: Dimensions Nrg 16-50 S
Technical data – continued – Dimensions NRG 16-50 S Flange PN 40, DN 50, DIN 2527, form B bolt circle ∅ 125 (4x ∅ 18 for M 16) ∅ 165 Fig. 2 NRG 16-50 S for marine applications... -
Page 8: Installation
Installation NRG 16-50 S Fig. 3 Fig. 4 Measuring electrode Anti-rotation element Bore Thermal insulation (provided on site) d=20 mm (outside of thermal insulation of steam boiler) Spring Sealing surface Electrode tip Flange joint (provided on site) NRG 16-50 S with four-pole connector Connecting pipe socket (provided on site) -
Page 9: Nrg 16-50 S, Step 1
Installation – continued – NRG 16-50 S, step 1 1. Screw electrode tip 4 into measuring electrode 1. Fig. 3 2. Carefully determine required measuring length of electrode. 3. Mark length of electrode tip 4. 4. Unscrew electrode tip 4 from measuring electrode 1 and cut tip. 5. -
Page 10: Examples Of Installation
Installation – continued – Examples of installation for NRG 16-50 S ≥ 14 ≥ DN 20 DN 50 ≥ 14 ≤ 90 ° ∅ 20 Fig. 5 Protection tube (provided on site) if electrode is used as internal water-level limiter ≥... -
Page 11: Key
Installation – continued – For the approval of the boiler standpipe with connecting flange the relevant regulations must be considered. Vent hole Provide vent hole as close to the boiler wall as possible! Electrode tip ∅ 8 mm ≥ Protection tube DN 80 ≥... -
Page 12: Electrical Connection
Electrical Connection NRG 16-50 S with four-pole connector Fig. 7 Screw M 4 Cover Upper part of the terminal box Connecting plate Insulating plate Contact plate of level electrode Cable strain relief Cable gland M 16 (PG 9) -
Page 13: Connection Of Level Electrode
Electrical Connection – continued – Connection of level electrode To connect the level electrode(s) use screened multi-core control cable with a min. conductor size 0.5 mm , e.g. LiYCY 4 x 0.5 mm Max. length 100 m with an electrical conductivity of the boiler water > 10 μS/cm at 25 °C. Wire terminal strip in accordance with the wiring diagram. -
Page 14: Wiring Diagram
Electrical Connection – continued – Wiring diagram Fig. 8 Wiring diagram for equipment with ONE electrode Fig. 9 Wiring diagram for equipment with TWO electrodes Fig. 10 Electrical connection of level electrode with four-pole connector... -
Page 15: Key
Electrical Connection – continued – Stand-by input 1 / 2, 24 V DC, for connecting the logic unit SRL Level electrode NRG 1...-50S CEP Central earthing point in control cabinet Commissioning, fault indication and remedy For additional information on commissiong procedures and troubleshooting refer to the installation manual of the level switch NRS 1-50. - Page 16 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 819013-01/05-2012cm (808840-01) · GESTRA AG · Bremen · Printed in Germany...
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