16
NRG 10-52, NRG 16-52 - USA - Installation & Operating Manual -
850696-00
Installation
DANGER
Danger to life! Escaped hot steam can cause scalding.
Hot steam or hot water can escape suddenly if the level electrode is unscrewed under
pressure.
■
Reduce the boiler pressure to 0 psi (0 bar) and check the pressure before
unscrewing the level electrode.
■
Only remove the level electrode at 0 psi (0 bar) boiler pressure.
WARNING
The hot level electrode can cause severe burns.
The level electrode gets very hot during operation.
■
Always let the level electrode cool down before performing installation and mainte-
nance work.
■
Only remove level electrodes that have cooled down.
ATTENTION
Incorrect installation can lead to malfunctions in the plant or the level electrode.
■
Always install the level electrode in a vertical position.
■
Take care not to bend electrode rods during installation!
■
Avoid subjecting electrode rods to hard impacts.
■
Ensure a minimum of 1.2 in (30 mm) for the electrode tip insulation.
■
Do
not
install the upper part of the level electrode cover tube
B
in the boiler’s
thermal insulation!
■
Do not coat the electrode thread with conductive paste or grease!
■
Make sure there is a creepage path of at least 0.55 in (14 mm) between the
electrode tips and ground (flange, tank wall).
Figs. 5, 6
■
Ensure minimum clearances when installing the electrode.
Note
■
An NRG 10-52, 16-52 level electrode can be installed in a single protective tube
or level pot [inside diameter 3.94 in(100 mm)] together with a GESTRA level
electrode, and a compact level switch or transmitter. If the level limiting elec-
trode is installed inside the vessel, it must be at least 1.57 in (40 mm) away from
the upper pressure relief hole.
■
Check the boiler standpipe and flange during the preliminary boiler inspection.
■
Installation examples can be found on pages 19 and 20.
■
If installed outdoors, the level electrode
must
be equipped with a GESTRA
weatherproof hood.
