7
Note
One level electrode NRG 10-52 / NRG 16-52 can be installed together with one GESTRA
level electrode, one compact level switch or transmitter in a single protection tube or
external level pot (inside diameter 100 m).
Fig. 4 - 7.
If the level limiting electrode is
installed inside the vessel, it must be at least 40 mm away from the upper vent hole.
For the approval of the boiler standpipe the relevant regulations must be considered.
Refer to pages 10 for typical installation examples.
If installed outdoors the level electrode
must
be equipped with a GESTRA weather
protection cover.
The level electrode shall be installed vertically.
The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, see
Fig. 3
.
Do not bend electrode tips when mounting.
Do not subject electrode tips to physical shocks.
At least 30 mm of the insulating tube must remain on the electrode tips.
Use only the supplied joint ring.
NRG 1.-52: 33 x 39, form D, DIN 7603, 1.4301, bright annealed
Do not lag electrode body above the hexagonal section.
Do not insulate electrode thread with hemp or PTFE tape!
Do not apply conductive paste or grease to the electrode thread!
Make sure that the air distance between the electrode tips and earth (flange, vessel
wall) is not less than 14 mm.
Fig. 4 - 7.
Observe the minimum withdrawal distance when installing the electrode!
The specified torques must be strictly observed.
Attention
Tools
Open-end spanner A. F. 41, DIN 3110, ISO 3318
Scriber
Bolt cutter
Flat file, medium cut, DIN 7261, form A
Installation
