17
Attention
n
The seating surfaces and threads on the vessel and mounting flange must be
accurately machined,
Fig. 12
n
Do not bend the electrode tip when cutting.
n
Use only the supplied gasket:
NRG 16-11, NRG 17-11, NRG 19-11: 27 x 32, form D, DIN 7603, 1.4301
NRG 111-11: D 33 x 39, DIN 7603-1.4301
n
Do not lag the electrode body.
n
Do not insulate the threads with hemp or PTFE tape.
n
Do not apply conductive paste or grease to the electrode thread.
n
Provide a min. spacing of 14 mm between electrode and earth (flange, boiler wall),
Fig. 11, Fig. 17
n
Observe the minimum distances for the installation of the electrode.
n
If the level electrode
NRG 111-11
is to be installed in a flanged standpipe DN 50 use
only the GESTRA hat flange!
Fig. 11
n
When using the level electrode
NRG 111-11
take the pH limit value (10) and the max.
admissible electrical conductivity (100 µS/cm at 25 °C) into consideration.
Installation
NRG 16-11, NRG 17-11, NRG 19-11, NRG 111-11, step 1
1. Screw electrode tip
4
into measuring electrode
1
,
Fig. 8
2. Carefully determine required measuring length, taking minimum length into account.
3. Mark length of electrode tip
4
.
4. Unscrew electrode tip
4
from measuring electrode
1
and cut tip.
5. Screw electrode tip
4
into measuring electrode
1
and tighten. Slide spring
3
along electrode tip
4
, so that its bent end completely enters into small bore
2
.
6. If a measuring surface extension is required slip disk
6
onto electrode tip
4
ensuring that the
electrode tip protrudes 2 mm from disk. Fasten disk with grub screw
5
. Push retaining ring
7
over
electrode tip against disk
6
.
NRG 16-11, NRG 17-11, NRG 19-11, NRG 111-11, step 2
1. Check seating surfaces,
Fig. 12
2. Place supplied gasket
8
onto seating surface of the threaded standpipe or flange.
Fig. 10
3. Apply a light smear of silicone grease (e. g. WINIX
®
2150) to electrode thread
0
.
4. Screw level electrode into threads of flange provided on vessel and tighten with a 36/41 mm ring
spanner. The torque required is
160 Nm when cold
(NRG 16-11, NRG 17-11, NRG 19-11) or
475 Nm
(NRG 111-11).
WINIX
®
2150 is a registered trademark of WINIX GmbH, Norderstedt, Germany
