Flowserve GESTRA NRG 26-21 Manual de usuario
1
GESTRA Steam Systems
GESTRA
NRG 2621
Installation Instructions 81877402
Level Electrode
NRG 26-21
EN
English
2
Contents
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
Danger ...................................................................................................................................................4
Attention.................................................................................................................................................4
ATEX (Atmosphère Explosible).................................................................................................................4
Note on the Declaration of Conformity / Declaration by the Manufacturer ..........................................4
Important Notes
Page
Explanatory Notes
Scope of supply......................................................................................................................................5
System description .................................................................................................................................5
Function .................................................................................................................................................5
Design....................................................................................................................................................5
NRG 26-21 ...........................................................................................................................................12
Attention...............................................................................................................................................12
Note .....................................................................................................................................................12
Tools.....................................................................................................................................................12
Examples of installation ........................................................................................................................13
Key.......................................................................................................................................................14
Installation
NRG 26-21 ......................................................................................................................................... 6, 7
Name plate / marking .............................................................................................................................7
Dimensions.............................................................................................................................................8
Technical Data
NRG 26-21 .............................................................................................................................................9
Key.......................................................................................................................................................11
Design
NRG 26-21 ...........................................................................................................................................10
Key.......................................................................................................................................................11
Functional Elements
3
Electrical Connection
NRG 26-21 ...........................................................................................................................................15
Wiring diagram.....................................................................................................................................16
Setting measuring range.......................................................................................................................16
Tools.....................................................................................................................................................16
Checking electrical connection .............................................................................................................20
Checking measuring voltages ...............................................................................................................20
Contents – continued –
Commissioning
Page
Danger .................................................................................................................................................22
Disposal................................................................................................................................................22
Decommissioning
NRG 26-21 ...........................................................................................................................................20
Note .....................................................................................................................................................20
Operation
Fault-finding list for troubleshooting......................................................................................................21
Operational Malfunctions
Factory setting......................................................................................................................................17
Establishing active measuring range.............................................................................................17 – 19
Attention...............................................................................................................................................17
Note .....................................................................................................................................................20
Basic Settings
4
Important Notes
Danger
When loosening the electrode live steam or hot water might escape.
This presents the danger of sever scalding.
It is therefore essential not to dismantle the electrode unless the boiler pressure is
verified to be zero.
The electrode is hot during operation.
This presents the risk of severe burns to hands and arms.
Installation and maintenance work should only be carried out when the system is cold.
Usage for the intended purpose
Use level electrode NRG 26-21 only in conjunction with level switches NRR 2..., NRS 2... or NRT 2... for
indicating liquid levels.
Note that the equipment must not be used in explosion risk areas.
Safety note
The equipment must only be installed and commissioned by qualified and adequately trained per-
sonnel.
Maintenance and retrofitting must only be performed by entrusted personnel who – through adequate
training – have achieved a recognised level of competence.
Attention
The name plate specifies the technical features of the equipment. Note that any piece of
equipment without its specific name plate must neither be commissioned nor operated.
ATEX (Atmosphere Explosible)
According to the European Directive 94/9/EC the equipment must not be used in potentially explosive
areas.
Note on the Declaration of Conformity / Declaration by the Manufacturer
For details on the conformity of our equipment according to the European Directives see our Declaration
of Conformity or our Declaration of Manufacturer.
The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under
www.gestra.de/documents or can be requested from us.
5
Explanatory Notes
System description
The level electrode NRG 26-21 works according to the capacitance measurement principle. The
NRG 26-21 is used for signalling different levels in electrically conductive and non-conductive liquids:
nLevels maintained within the control band defined by two preset limits
The preamplifier NRV 2-29 is integrated in the terminal box of the level electrode.
Function
Design
The principle of capacitance measurement is applied to determine the level. The electrode rod and
the vessel wall form a capacitor. If the level of the dielectric located between the two capacitor plates
changes, the current which flows through the plates changes proportionally to the level.
A dielectric is defined as an insulating substance, which excludes many liquids such as water. In
order to receive a useful measuring result the measuring rod, which is submerged to varying depths
in the liquid, must be completely insulated. After the calibration of the zero point / measuring range
(0 % / 100 %), the level can be read off from a remote display unit. The level measuring range can be
changed during operation.
NRG 2621
Screwed design ¾", DIN ISO 228-1, Fig. 2
Scope of supply
NRG 2621
1 Level electrode NRG 26-21 with joint ring D 27 x 32 DIN 7603, 1.4301 bright annealed
1 Installation manual
6
Type approval no.
TÜV · WR · 01-320
Service pressure
PN 40, 32 bar g at 238 °C
Connections
Screwed ¾", DIN ISO 228-1
Materials
Terminal box: PPO (Noryl®)
Sheath: 1.4301 X5 CrNi18-10
Screwed union: 1.4571 CrNiMoTi17-12-2
Measuring electrode: 1.4571 CrNiMoTi17-12-2
Electrode insulation: PTFE
Supply voltage
12 V
Length supplied / measuring range
$Max. installation length at 238 °C
%Measuring range
$ %
373 300
477 400
583 500
688 600
794 700
899 800
1004 900
1110 1000
1214 1100
1319 1200
1423 1300
1528 1400
1636 1500
2156 2000
NRG 2621
Technical Data
7
Technical Data – continued –
NRG 2621 – continued –
Sensitivity
Range 1: Water ≥0.5 µS/cm
Range 2: Water ≥20 µS/cm
Range 3: Fuel oil EL εr2.3
Cable entry
Cable gland with integral cable clamp M 16
Protection
IP 65 to DIN EN 60529
Max. admissible ambient temperature
70 °C
Weight
approx. 1.8 kg
Name plate / marking
Fig. 1
32 bar (464psi)
238°C (460°F)
T amb = 70°C (158 °F)
NRG 26-21
Betriebsanleitung beachten
See installation instructions
Voir instructions de montage
Pmax
Tmax
PN 40 G 3/4 1.4571 IP 65
Mat.Nr.:
GESTRA AG D-28215 Bremen
TÜV.WR/WRS.09-317 TÜV.WR.06-320
Equipment designation Safety note
Disposal note
CE marking
Pressure rating, thread type,
material number,
type approval number
Manufacturer Material number
8
Technical Data – continued –
Dimensions
%Constant length (no elongation)
Fig. 2
∅ 42
¾"
$%
37
26
280
9
1
Design
Fig. 3
Fig. 4
N 1
N 10
0.5
∅ 33
¾" DIN 228
NRG 2621
2
4
3
10
Functional Elements
Fig. 5
Preamplifier NRV 2-29 integrated in the terminal box
7
5
!
0
9
NRG 2621
6
8
MAX 70 C
MAX 95%
%
IP 65
"
§
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