Summary of Contents for Flowserve GESTRA NRG 26-21
- Page 1 GESTRA GESTRA Steam Systems NRG 2621 English Installation Instructions 81877402 Level Electrode NRG 26-2...
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Page 2: Table Of Contents
Contents Page Important Notes Usage for the intended purpose ......................4 Safety note .............................4 Danger ..............................4 Attention ..............................4 ATEX (Atmosphère Explosible) .........................4 Note on the Declaration of Conformity / Declaration by the Manufacturer ..........4 Explanatory Notes Scope of supply ............................5 System description ..........................5 Function ..............................5 Design ..............................5 Technical Data... - Page 3 Contents – continued – Page Electrical Connection NRG 26-2 ............................5 Wiring diagram .............................6 Setting measuring range ........................6 Tools ..............................6 Basic Settings Factory setting ............................7 Establishing active measuring range .....................7 – 9 Attention ...............................7 Note ..............................20 Commissioning Checking electrical connection ......................20 Checking measuring voltages .......................20 Operation NRG 26-2 ............................20...
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Page 4: Important Notes
Important Notes Usage for the intended purpose Use level electrode NRG 26-2 only in conjunction with level switches NRR 2..., NRS 2... or NRT 2... for indicating liquid levels. Note that the equipment must not be used in explosion risk areas. Safety note The equipment must only be installed and commissioned by qualified and adequately trained per- sonnel. -
Page 5: Explanatory Notes
Explanatory Notes Scope of supply NRG 2621 Level electrode NRG 26-2 with joint ring D 27 x 32 DIN 7603, .430 bright annealed Installation manual System description The level electrode NRG 26-2 works according to the capacitance measurement principle. The NRG 26-2 is used for signalling different levels in electrically conductive and non-conductive liquids: Levels maintained within the control band defined by two preset limits The preamplifier NRV 2-29 is integrated in the terminal box of the level electrode. -
Page 6: Technical Data
Technical Data NRG 2621 Type approval no. TÜV · WR · 0-320 Service pressure PN 40, 32 bar g at 238 °C Connections Screwed ¾", DIN ISO 228- Materials Terminal box: PPO (Noryl ® Sheath: .430 X5 CrNi8-0 Screwed union: .457 CrNiMoTi7-2-2 Measuring electrode: .457 CrNiMoTi7-2-2 Electrode insulation: PTFE... -
Page 7: Name Plate / Marking
Max. admissible ambient temperature 70 °C Weight approx. .8 kg Name plate / marking Equipment designation Safety note Betriebsanleitung beachten NRG 26-21 Disposal note See installation instructions Voir instructions de montage TÜV.WR/WRS.09-317 TÜV.WR.06-320 Pressure rating, thread type, PN 40 G 3/4 1.4571... -
Page 8: Dimensions
Technical Data – continued – Dimensions ∅ 42 ¾" Fig. 2 Constant length (no elongation) -
Page 9: Design
Design NRG 2621 Fig. 3 ∅ 33 ¾" DIN 228 Fig. 4... -
Page 10: Functional Elements
Functional Elements NRG 2621 MAX 70 C MAX 95% IP 65 " § Fig. 5 Preamplifier NRV 2-29 integrated in the terminal box... - Page 11 Design / Functional Elements Thermal insulation provided on site, d = 20 mm (without thermal insulation of steam boiler) Seating surface Joint ring D 27 x 32, DIN 7603 – .430 Electrode thread ¾", DIN ISO 228- Screw M4 Cover Seal Terminal strip Cable entry M6 (PG 9)
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Page 12: Installation
Installation NRG 2621 . Check seating surfaces of threads or flange provided on vessel or boiler standpipe, Fig. 4. 2. Place joint ring 3 onto seating surface 2 of the electrode, Fig. 3. Use only joint ring (of stainless steel .430) D 27 x 32 to DIN 7603 supplied with electrode. 3. -
Page 13: Examples Of Installation
Installation – continued – Examples of installation ¾" ¾" & & DN 50 DN 50 ≤ ≤ 90° 90 ° ∅ 20 ∅ 20 Fig. 6 Fig. 7 ¾" & ¾" ¾" & DN 20 DN 00 24.5 24.5 ≤ 90° DN 20 ∅... -
Page 14: Key
Installation – continued – & Flange PN 40, DN 50, DIN 2527 Flange PN 40, DN 00, DIN 2527 For the approval of the boiler standpipe with connecting flange the relevant regulations must be considered. Vent hole High water (HW) Electrode rod d = 5 mm Protection tube DN 80 Protection tube DN 00... -
Page 15: Electrical Connection
Electrical Connection NRG 2621 Electrical connection via four pole connector. Note that screened four core cable, e. g. I-Y(St)Y 2 x 2 x 0.8 or LICYC 4 x 0.5 mm is required for wiring the electrode. Max. length 00 m with conductivities from 0 μS/cm. Max. -
Page 16: Wiring Diagram
Electrical Connection – continued – Wiring diagram 2 V DC ≥ 0 V ≤ 7 V DC NRG 2621 Fig. 10 Setting measuring range Adjust the preamplifier NRV 2-26 integrated in the terminal box ! to the operating conditions prevailing in your installation before putting the level electrode into operation. Make sure that the measuring range setting is correct for your application and check whether the fluid to be controlled is electrically conductive or not before commissioning the electrode. -
Page 17: Basic Settings
Basic Settings Factory setting The default setting of the code switch " is the max. measuring range for water (conductivity ≥ 20 μS/cm. The max. measuring range is the length % (distance between lower and upper measuring point) plus 26 mm, see Fig. 11. The level electrode features the following factory set default values: Code switch "... - Page 18 Basic Settings – continued – Establishing active measuring range – continued – Ascertain the type of fluid to be monitored. Establish the active measuring range [mm] for your application. Use diagrams h, i or j to determine the required code switch settings for water and fuel oil EL.
- Page 19 Basic Settings – continued – Establishing active measuring range – continued – Diagram for water, conductivity ≥ 25 μS/cm Code switch 4+5 ON 4 ON 3 ON 2 ON 1000 1200 1400 1600 1800 2000 Active measuring range (control range) [mm] Fig.
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Page 20: Note
Basic Settings – continued – Note When the measuring points of the electrode are established when the equipment is cold, the measuring points will shift as the temperature increases due to the thermal expansion of the electrode rod. The setting must then be corrected. Commissioning Checking electrical connection . -
Page 21: Operational Malfunctions
Operational Malfunctions Faultfinding list for troubleshooting The equipment fails to work Fault: The electrode housing does not have earth connection to the boiler. Remedy: Clean seating surfaces and insert metal joint ring as shown in drawing. Do not insulate the electrode with hemp or PTFE tape. Fault: Mains voltage is not applied to the equipment. -
Page 22: 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 23 For your notes...
- Page 24 0035 22 / 6 9 87 70 0044 6 35 / 3 60 34 0035 22 / 6 0 75 75 E-mail: gestraukinfo@flowserve.com E-mail: jtavares@flowserve.com Italia Flowserve GESTRA U.S. Flowserve S.p.A. Flow Control Division 234 Ampere Drive Via Prealpi, 30 Louisville, KY 40299 l-20032 Cormano (MI) Tel.