Flowserve NRGS 16-4 - Manual (Page 10)

10
Installation
Cutting elec trode tip to length
1. Carefully determine the required length of the electrode tip in accordance with the level-dependent
switchpoint (the length should be measured from the gasket face of the screwed connection). In
steam boilers operating at full load arching of the water level may occur. This phenomenon should be
taken into account when determining the length of the electrode tip.
2. Cut the electrode tip to length using a bolt cutter or a metal cutting saw.
3. Deburr the face of electrode tip end.
4. Strip off 50 mm of PTFE insulation from the end of the electrode tip (see Fig. 1). Make sure that the re-
maining insulation is at least 30 mm long, measured from the lower edge of the screwed connection.
Mounting electrode
In steam or (pressurised) hot water boilers the level electrode can be installed vertically or with an inclina-
tion of 45°.
1. Check seating surfaces of threads or mounting flange provided on vessel or boiler standpipe (see Fig.1
and Fig.2). If necessary rework the surfaces according to the specifications indicated in the drawing.
2. Place supplied joint ring onto the seating surface of the level electrode.
3. Apply a light smear of silicone grease to the electrode thread.
4. Screw electrode into threads or flange provided on vessel (see Fig.2) and tighten with a 22 mm open-
end spanner. The torque required when cold is 63 Nm.
■ The seating surfaces and threads on the vessel and mounting flange must be accurately
machined.
■ Do not bend the electrode tip when cutting.
■ Do not subject electrode to physical shocks.
■ Use only the supplied ring joint 17 x21 form D to DIN 7603, made from 1.4301, bright an-
nealed!
■ Do not insulate the threads with hemp or PTFE tape!
■ Do not lag the electrode body above the hexagonal part.
■ Make sure that there is an air gap of > 14 mm around the electrode rod. Note that the air
distance between the electrode rod and earth (flange, vessel wall) must not be less than 14mm.
■ Be sure that the electrode insulation is at least 30 mm long.
■ The specified torques must be strictly observed.
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Attention