GESTRA NRG 111-50, Руководство по установке

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Note
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One level electrode NRG 1...-50 can be installed together with one GESTRA level elec-
trode, one level switch or transmitter for water level control or high level alarm in one
single protection tube or level pot (inside diameter 100 mm). Fig. 17. If the electrode
NRG 1...-50 is installed inside the vessel, it must be at least 40 mm away from the
upper vent hole.
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The installation of two water-level limiting electrodes NRG 1...-50 in one single stand-
pipe is not allowed.
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For the approval of the boiler standpipe the relevant regulations must be considered.
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Refer to pages 16 – 17 for typical installation examples.
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The angle of inclination of the electrode must not exceed 45°, with the length of the
electrode rod being limited to 1000 mm.
Fig. 16, 20
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If used in combination with level switch NRS 1-50 with a response sensitivity of
0.5 µS/cm please us a measuring surface extension.
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For outdoor installations please use level electrode NRG 1...-50 F.
Level electrodes with this suffix (F) feature a terminal box made from aluminium.
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The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, see Fig. 12.
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If the level electrode NRG 111-50 is to be installed in a flanged standpipe DN 50 use
only the GESTRA hat flange. Fig. 11
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Do not bend electrode tip when mounting.
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Use only the joint rings supplied with the electrode.
NRG 16-50, NRG 17-50, NRG 19-50: 27 x 32, form D, DIN 7603, 1.4301
NRG 111-50: 33 x 39, form D, DIN 7603, 1.4301
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Do not lag electrode body above the hexagonal section.
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Do not insulate electrode thread with hemp or PTFE tape!
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Do not apply conductive paste or grease to the electrode thread!
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Make sure that the air distance between the electrode rod and earth (flange, vessel
wall) is not less than 14 mm. Fig. 11, Fig. 15-21
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Observe the minimum distances for the installation of the electrode!
Attention
Tools
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Open-end spanner A. F. 13, DIN 3110, ISO 3318
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Open-end spanner A. F. 19, DIN 3110, ISO 3318
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Open-end spanner A. F. 41, DIN 3110, ISO 3318
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Scriber
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Hacksaw
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Flat file, medium cut, DIN 7261, form A
Installation
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