Technical Data - Flowserve GESTRA Serie Instrucciones De Montaje

ENGLISH
Important Safety Note
No user serviceable parts are contained with-
in the equipment. All repairs must be perfor-
med only by the manufacturer. Misuse or any
attempted modification of the equipment will
lead to considerable safety risks!
Available Designs
NRG 16-36: Screwed connection 1
(G 1 / ˝ to ISO 228), PN 40.
1
2
NRG 16-36.1 and NRG 16-36.2: With flange
PN 40 supplied separately, DN 50 or DN 100
mm.
Note
GESTRA level electrodes are high-quality
measuring probes and should be handled
with care. Avoid subjecting the electrode tips
to shocks or bending as this might cause
damage to the electrode seal.
Installation
Step 1
1. Carefully determine required measuring
length of each electrode tip and note the
lengths in the table. (Fig. 3)
2. Cut electrode tips , ,
› œ
the required lengths. In the case of tips
, consider minus 2 mm reduction to
œ 
compensate for the measuring surface
extensions. (Figs. 3 and 4)
3. Strip off PTFE insulation from the ends of the
electrode tips according to Fig. 5 or Fig. 6.
4. A plastic bag with screws, spacer discs
and measuring surface extensions is
included in the terminal box
trode.

Technical Data

Types
Max. service pressure at
saturation temperature 238 °C
Connections
Nominal size DN
Function
Cell constant C with measuring surface extension
Lengths available
Materials
Body
Flange
Electrode tips
Max. permissible ambient temperature at terminal box
Electric connection
Approx. weight (length 1500 mm)
*)Inspection in accordance with DIN 50049 3.1B
5. From electrode-tip lengths of 1000 mm, a
spacer disc
6. Slip spacer disc
(Fig. 4)
7. Fix a measuring surface extension
each of the tips
8. Slip measuring-surface extension
the central electrode tip (LW) and fasten
with screw
9. Push lock washer
/ ˝ BSP
1
2
trode tip.
Step 2
1. Check seating surface of threads or flange
provided on vessel or boiler standpipe.
(Fig. 7)
2. Place ring joint
of electrode (see Fig. 5).
Note: Use only ring joint (of stainless
steel 1.4301 N) D 48x55 to DIN 7603
supplied with electrode.
3. Apply lubricant to electrode thread
4. Screw level electrode into threads or flange
provided on vessel or boiler standpipe and
tighten with a 55 mm ring spanner. The
torque required is 490 Nm when cold.
and (LW) to

Important Notes
,
›
The seating surfaces of the threads or flange
I
provided on the boiler standpipe must be
accurately machined (see Fig. 7).
Do not bend electrode tips when mounting.
I
Do not lag electrode body situated above
I
the hexagonal part.
G
of the elec- For the approval of the boiler standpipe the
I
I
relevant regulations must be considered.
G
is required.
A
G
over electrode tips.
A
G
to
B
, , .
› œ 
G
onto
C
G
.
D
G
over central elec-
E
G G
onto seating surface
F
G
.
H
NRG 16-36
1 / ˝
1
2
BSP
PN 40
On-off feedwater control, high-level alarm, and low water-level limiter
Austenitic stainless steel X 6 CrNiMoTi 17 2 2 (1.4571)
Austenitic stainless steel X 6 CrNiMoTi 17 2 2 (1.4571)
four-pole connectors with screw terminals PG 9
2.9 kg
Wiring
Cable required for wiring: two four-core over-
all screened cables, e.g. 4 x 0.5 mm
Max. cable length 100 m with a conductivity
from 10 µS/cm.
Max. cable length 30 m with a conductivity
from 0.5 µS/cm.
Max. cable length 15 m with a conductivity
from 0.5 µS/cm when used in conjunction
with inverter URN 1-b (24 V DC).
Wiring in the terminal box
in accordance with diagram Fig. 9.
G
Associated Electronic
Control Unit
Self-monitoring switching controller type
NRS 1-9 with periodic self-checking to
DIN 57116/VDE 0116.
Ancillary Equipment
Logic unit for monitoring type SRL 6 to en-
sure automatic intermittent purging of the
external chamber for electrodes installed
outside the boiler. (Fig. 2)
NRG 16-36.1
32 barg (465 psig)
1 / ˝
1
2
BSP
with 50 mm PN 40 with 100 mm PN 40
mounting flange *) mounting flange *)
(DIN 2527)
0.13 cm
-1
500 , 1000 or 1500 mm
Forged steel C 22.8 (1.0460)
70 °C
2
6.3 kg
.
2
G
(Figs. 5 and 8)
I
NRG 16-36.2
1 / ˝
1
2
BSP
(DIN 2527) or
square flange *)
128 mm
10.3 kg
5