14
Attention
n
The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, see
Fig. 7.
n
Do not bend electrode tip when mounting.
n
Use only ring joint (of stainless steel 1.4301) D 27 x 32 to DIN 7603 supplied with
the electrode.
n
Do not lag electrode body above the hexagonal section,
Fig. 5.
n
Do not insulate electrode thread with hemp or PTFE tape.
n
Do not screw electrode directly into a screwed socket,
Fig. 6.
n
Observe min. spacing when installing the electrode,
Fig. 6, Fig. 10, Fig. 11, Fig. 12
Installation
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, 19-41.1, step 1
1. Screw electrode tip
4
into measuring electrode
1
, Fig. 4.
2. Carefully determine required measuring length of electrode. Observe min. length,
Fig. 2, Fig. 3.
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 into small bore
2
.
Note
n
For the approval of the boiler standpipe the relevant regulations must be considered.
n
Refer to page 15 for three typical installation examples.
Tools
n
Open-end spanner A. F. 17 mm
n
Open-end spanner A. F. 41 mm
n
Hacksaw
n
Flat file, medium cut
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, 19-41.1, step 2
1. Check seating surfaces,
Fig. 6
2. Place ring joint
5
supplied with electrode onto seating surface
6
of electrode,
Fig. 5
3. Apply a light smear of silicone grease (e.g. Molykote
®
111) to electrode thread
7
.
4. Screw level electrode into threads of flange provided on vessel and tighten with
a 41 mm open end spanner. The torque required is
160 Nm when cold
.
5.
When installing two electrodes together in one flange install the first electrode as described in 4.
Before mounting the second electrode undo plug
e
, remove PE connection
d
and strip cable lugs
from the board. Screw in electrode. Slightly tighten plug
e
. Install PE connection
d
and insert
cable lugs.
Molykote
®
111 is a registered trademark of DOW Corning Corp., Midland Michigan, USA
Summary of Contents for NRG 16-41
Page 27: ...27 For your Notes ...
