GESTRA NRG 16-50S Manual de usuario
1
EN
English
Level Electrode
NRG 16-50S
Original Installation Instructions
819013-01
2
Contents
Usage for the intended purpose ..............................................................................................................4
Function .................................................................................................................................................4
Safety note .............................................................................................................................................5
Scope of supply ......................................................................................................................................5
Important notes
Page
NRG 16-50 S ..........................................................................................................................................6
Name plate/marking ...............................................................................................................................6
Dimensions NRG 16-50 S ......................................................................................................................7
Technical data
NRG 16-50 S ..........................................................................................................................................8
NRG 16-50 S, step 1...............................................................................................................................9
NRG 16-50 S, step 2...............................................................................................................................9
Tools.......................................................................................................................................................9
Examples of installation ........................................................................................................................10
Key.......................................................................................................................................................11
Installation
Electrical connection
NRG 16-50 S with four-pole connector..................................................................................................12
Connection of level electrode ................................................................................................................13
NRG 16-50 S with four-pole connector..................................................................................................13
Tools.....................................................................................................................................................13
Wiring diagram .....................................................................................................................................14
Key.......................................................................................................................................................14
3
Commissioning, fault indication and remedy
Danger .................................................................................................................................................15
Removing and disposing of electrode....................................................................................................15
Note .....................................................................................................................................................15
Removing and disposing of electrode
NRG 16-50 S ........................................................................................................................................15
Contents – continued –
Page
4
Important Notes
Usage for the intended purpose
The level electrode NRG 16-50 S is used in conjunction with level switch NRS 1-50 (de-energizing
delay: 15 seconds) as water-level limiter for steam boilers and (pressurized) hot-water installations on
board of seagoing vessels, mobile offshore platforms or river boats.
Water level limiters switch off the heating when the water level falls below the set minimum level (low
water).
Function
When the water level falls below the low level, the level electrode is exposed and a low level alarm is
triggered in the level switch NRS 1-50. This switchpoint “Low water level (LW)” is determined by the
length of the electrode tip.
After the de-energizing delay has elapsed, the two output contacts of the level switch NRS 1-50 will
open the safety circuit for the heating. The equipment has a factory set default de-energizing delay of
15 seconds to compensate for the the movements of the ship.
The self-monitoring function ensures that an alarm will also be triggered if the electrode insulation is
contaminated or has developed a leak or if there is a malfunction in the electrical connection.
The level electrode is installed inside steam boilers, vessels or inlet lines of hot-water systems. The
protective tube mounted on site (see section Examples of Installation (pages 10, 11)) ensures correct
functioning.
If the level electrode is installed in an isolatable level pot outside the boiler, make sure that the
connecting lines are rinsed regularly. In addition, the logic unit SRL 6-50 is required to monitor the
purging times and the purging sequence.
If the connecting lines for steam ≥ 40 mm and water ≥ 100 mm, the installation is considered to be
internal. In this case the rinsing processes do not have to be monitored.
5
Important Notes – continued –
Safety note
Danger
When loosening the level electrode steam or hot water might escape!
This presents the risk of severe scalding all over the body!
It is therefore essential not to dismantle the level electrode unless the boiler pressure is
verified to be 0 bar.
The level electrode becomes hot during operation.
Risk of severe burns to hands and arms.
Before carrying out installation and maintenance work make sure that the equipment is
cold.
Attention
The name plate specifies the technical features of the equipment. Do not commission or
operate any item of equipment that does not bear its specific name plate.
Water level limiters are safety devices and must only be installed, wired and commissioned by
qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who – through adequate
training – have achieved a recognised level of competence.
Scope of supply
NRG 16-50 S
1 Level electrode NRG 16-50 S, PN 40, DN 50
1 Installation manual
6
NRG 16-50 S
Technical data
Service pressure
PN 40, 32 bar at 238 °C
Mechanical connection
Flange PN 40, DN 50, DIN 2527, form B
Materials
Sheath 1.4301, X5 CrNi18-10
Flange 1.0460 / A 105
Screw-in body 1.4571, X6CrNiMoTi17-12-2
Measuring electrode 1.4571, X6CrNiMoTi17-12-2
Electrode tip 1.4401, X5CrNiMo17-12-2
Electrode insulation Gylon®
Four-pole connector Polyamid (PA)
Lengths available
500 mm, 1000 mm, 1500 mm, 2000 mm
Electrical connection
Four-pole connector, cable gland M 16
Protection
IP 65 to EN 60529
Max. admissible ambient temperature
70°C
Weight
Approx. 4.5 kg (without electrode tip)
Approvals
see data sheet
Gylon®is a registered trademark of Garlock Sealing Technologies, Palmyra NY, USA
Name plate / marking
Equipment designation Safety note
Disposal note
Pressure rating, flange type,
material number
Manufacturer
Pressure/temperature rating
Fig. 1
7
Technical data – continued –
Dimensions NRG 16-50 S
Fig. 2
NRG 16-50 S for
marine applications
80
≤ 2000
295
∅ 165
Flange PN 40, DN 50,
DIN 2527, form B
bolt circle ∅ 125
(4x ∅ 18 for M 16)
8
Fig. 3
1
2
3
4
Installation
NRG 16-50 S
8
9
9
Fig. 4
5
1Measuring electrode
2Bore
3Spring
4Electrode tip
5NRG 16-50 S with four-pole connector
Key
6Anti-rotation element
7Thermal insulation (provided on site) d=20 mm
(outside of thermal insulation of steam boiler)
8Sealing surface
9Flange joint (provided on site)
0Connecting pipe socket (provided on site)
0
7
6
9
Installation – continued –
NRG 16-50 S, step 1
1. Screw electrode tip 4into measuring electrode 1. Fig. 3
2. Carefully determine required measuring length of electrode.
3. Mark length of electrode tip 4.
4. Unscrew electrode tip 4from measuring electrode 1and cut tip.
5. After visual inspection screw electrode tip 4into measuring electrode 1. Slide spring 3along
electrode tip 4 so that its end completely enters the small hole 2.
NRG 16-50 S, step 2
6. Check seating surfaces. Fig. 4
7. Put flange joint 9onto connecting pipe socket 0.Fig. 4
8. Put level electrode onto connecting pipe socket and fix it with four bolts M 16.
9. Tighten bolts in diagonally opposite pairs. The tightening torque depends on the flange joint used.
nMake sure that the sealing surface of the connecting pipe socket is accurately
machined!
nDo not bend electrode tip when mounting.
nDo not lag electrode body above the hexgonal section.
nObserve minimum spacing of 14 mm between measuring electrode / electrode tip and
protection tube / level pot! Fig. 5, Fig. 6
nObserve the minimum spacings when installing the electrode!
Attention
Note
nFor the approval of the boiler standpipe the relevant regulations must be considered.
nRefer to pages 10 for typical installation examples.
Tools
nOpen-end spanner A. F. 13, DIN 3110, ISO 3318
nScriber
nHacksaw
nFlat file, medium cut, DIN 7261, form A
10
Installation – continued –
g
Examples of installation for NRG 16-50 S
Fig. 6 Level pot if electrode is used
as external water-level limiter
a
Fig. 5 Protection tube (provided on site)
if electrode is used as internal water-level limiter
≥14
≤2000
≤20
c
d
e
∅20
≤90°
≥10
≥14
DN 50
b
Centre
distance
≥DN 20
≥DN 20
DN 20
c
g
i
f
h
≥20
≥20
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