Related Manuals for GESTRA NRS 1-2
Summary of Contents for GESTRA NRS 1-2
- Page 1 GESTRA Steam Systems NRS 12 English Installation Instructions 81878003 Level Switch NRS 12...
-
Page 2: Table Of Contents
Contents Page Important Notes Usage for the intended purpose ......................4 Safety note .............................4 Danger ..............................4 LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility) ............4 ATEX (Atmosphère Explosible) .........................4 Note ...............................4 Note on the Declaration of Conformity / Declaration by the Manufacturer ..........4 Explanatory Notes Scope of supply ............................5... - Page 3 Contents – continued – Page Commissioning Checking electrical connection ......................16 Applying mains voltage ........................16 Performance Test Limit switch MIN / MAX ........................16 Note ..............................16 Operational Malfunctions Faultfinding list for troubleshooting ....................17, 18 Decommissioning Danger ..............................18 Disposal ...............................18...
-
Page 4: Important Notes
Important Notes Usage for the intended purpose Use level switch NRS 12 only in conjunction with GESTRA level electrodes NRG 164, NRG 1...52, ER 50 and ER 56. Safety note The equipment must only be installed and commissioned by qualified and adequately trained per... -
Page 5: Explanatory Notes
Level switch for indicating one high and one low liquid level (MIN alarm, MAX alarm), designed for use with GESTRA level electrodes NRG 164, NRG 1...52, ER 50 and ER 56. Application in steam and (pressurised) hot water plants according to TRD 602 and TRD 604, sheet 1 and sheet 2. -
Page 6: Technical Data
Technical Data NRS 12 Approval no. TÜV · WR/WB · 08302 Note: TÜV · WR/… for NRS 11, 12, 15, TÜV…/WB… for NRS 13; The type approval allows the combination of a water level controller and a water level limiter in conjunction with the associated level electrodes. -
Page 7: Name Plate / Marking
Technical Data – continued – Name plate / marking Betriebsanleitung beachten Equipment designation NRS 1-2 b See installation instructions Voir instructions de montage Supply voltage 230 V 50 Hz 3,5 VA Sensitivity of response 0,5µS/cm IP 40 Mat.Nr.: 056390 GESTRA AG Bremen... -
Page 8: Dimensions
Technical Data – continued – Dimensions Fig. 2 Fig. 3... -
Page 9: Design
Design NRS 12 Fig. 4 Fig. 5 NRS 1-2 MAX / HW MIN / NW Test NW MADE BY GESTRA Fig. 6... -
Page 10: Functional Elements
Functional Elements NRS 12 MAX 55°C MAX 95% IP 65 NRS 1-2 MAX / HW MIN / NW Test NW MADE BY GESTRA Fig. 7... -
Page 11: Key
Design / Functional Elements Cover screws Base Upper part Mounting clip Cable entry (soft seal) Cable entry (marked in housing) Fixing hole d = 4.3 mm Red LED for MAX alarm Red LED for MIN alarm Button “TEST LW” for simulating a MIN alarm... -
Page 12: Installation
Installation NRS 12 On supporting rail (with mounting clip) 1. Clip level switch onto supporting rail. 2. Loosen cover screws A and detach cover C from its base B. 3. Select cable entry E and remove corresponding seal. On mounting panel 1. -
Page 13: Examples Of Installation
Installation – continued – Examples of installation NRS 1-2 MAX / HW MIN / NW Test NW MADE BY GESTRA MAX 55°C Fig. 8 MAX 95% IP 65 Fig. 9... -
Page 14: Electrical Connection
Electrical Connection NRS 12 Cable required for wiring to the electrode: fourcore screened cable, e. g. IY(St)Y 2 x 2 x 0.8 or LIYCY 4 x 0.5 Max. cable length 100 m with a conductivity from 10 μS/cm. Max. cable length 30 m with a conductivity from 0.5 μS/cm. Max. -
Page 15: Wiring Diagram
Electrical Connection – continued – Wiring diagram MIN alarm MAX alarm Supply voltage NRG 1...52 (ER 5...) MAX (HW) MIN (LW) Fig. 10 Drawn position of contacts: deenergized / alarm Fig. 11 * Wire link, please observe note on page 14! MAX (HW) - Page 16 Commissioning Checking electrical connection Check that the NRS 12 and the associated level electrode are wired in accordance with the wiring diagram, Fig. 10, Fig. 11. Applying supply voltage Apply supply voltage to level switch NRS 12. Performance Test Limit switch MIN / MAX 1.
- Page 17 Operational Malfunctions Faultfinding list for troubleshooting Level electrode submerged – Low level alarm Fault: The level switch signals a low level (MIN) alarm before the water level in the steam boiler has reached the low level (MIN) switchpoint. Remedy: Check the length of the low level (MIN) electrode rod. Measure the conductivity of the pro cess or boiler water and compare the readings with the specification on the level switch.
- Page 18 Operational Malfunctions – continued – Faultfinding list for troubleshooting – continued – Fault: After lowering the water level below the highlevel (MAX) mark, the red LED 1 is still illuminated or goes out only after quite a while. Remedy: Check whether a vent hole has been provided in the protection tube. If the electrode is fitted in a measuring pot outside the boiler, check the position of shutoff valves.
- Page 19 For your notes...
- 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 81878003/052011cm (80822706) · GESTRA AG · Bremen · Printed in Germany...
Need help?
Do you have a question about the NRS 1-2 and is the answer not in the manual?
Questions and answers