GESTRA NRG 111-50, Руководство по установке

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13
Installation
- continued -
NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50, step 1
1. Screw electrode tip
4
into measuring electrode
1
. Fig. 8
2. Carefully determine required measuring length of electrode.
3. Mark length of electrode tip
4
.
4. Unscrew electrode tip
4
from measuring electrode
1
and cut tip.
5. After visual inspection screw electrode tip
4
into measuring electrode
1
. Slide spring
3
along
electrode tip 4 so that its end completely enters the small hole
2
.
6. Mounting the measuring surface extension: Fit disk
6
to electrode tip, making sure that the electro-
de tip protrudes 2 mm beyond the bottom of the surface extension disk. Fix the disk in this position
with the set screw
5
. Push supplied lock washer
7
from below over electrode tip and against
surface extension disk
6
.
NRG 16-50, NRG 17-50, NRG 19-50, NRG 111-50, step 2
7. Check seating surfaces.
Fig. 12
8. Place supplied joint ring
8
onto seating surface of the threaded standpipe or flange. Fig. 9
9. Apply a light smear of heat resistant silicone grease (e.g. WINIX ® 2150) to electrode thread
7
.
10. Screw level electrode into threads or flange provided on vessel and tighten with a 41 mm open-end
spanner. The torque required when cold is 160 Nm.
1
Measuring electrode
2
Bore
3
Spring
4
Electrode tip
5
Set screw
6
Disk (measuring surface extension)
7
Retaining ring
Key
8
NRG 1...-50: Joint ring 27 x 32, form D, DIN 7603,
1.4301, bright annealed
NRG 111-50: Joint ring 33 x 39, form D, DIN 7603,
1.4301, bright annealed
9
Seating surface
0
Electrode thread
a
Thermal insulation, provided on site, d = 20 mm
(outside of thermal insulation of steam boiler)