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NRG 26-40
User Manual
28 pgs410 Kb0

Flowserve NRG 26-40 User Manual

GESTRA
GESTRA Steam Systems
NRG 26-40
Installation Instructions 810274-02
Level electrode NRG 26-40
1
Contents
Page
Important Notes
Explanatory Notes
Technical data
Design
Key .......................................................................................................................................................11
Functional Elements
NRG 26-40 ...........................................................................................................................................10
Key .......................................................................................................................................................11
Installation
NRG 26-40 ...........................................................................................................................................12
Attention ...............................................................................................................................................12
Note .....................................................................................................................................................12
Tools .....................................................................................................................................................12
Examples of installation NRG 26-40 ..................................................................................................... 13
Key .......................................................................................................................................................14
2
Contents continued
Page
Wiring
NRG 26-40 ...........................................................................................................................................15
Aligning terminal box ............................................................................................................................ 15
Note .....................................................................................................................................................15
Wiring diagram ..................................................................................................................................... 16
Attention ...............................................................................................................................................17
Tools .....................................................................................................................................................17
Basic Settings
CAN Bus ...............................................................................................................................................18
Node ID ................................................................................................................................................18
Attention ...............................................................................................................................................18
Factory setting ......................................................................................................................................18
Factory set default node IDs .................................................................................................................. 19
Assigning / changing node ID ................................................................................................................ 19
Attention ...............................................................................................................................................19
Measuring range ................................................................................................................................... 21
Commissioning
Operation
Adjusting the attenuation of the level controller ............................................................................... 22-23
Malfunctions
Fault finding list for troubleshooting ................................................................................................ 23-24
Decommissioning
Danger .................................................................................................................................................25
Disposal................................................................................................................................................25
Annex
3
Important Notes
Usage for the intended purpose
Use level electrode NRG 26-40 only in conjunction with switching controller NRS 2-40 or level controller NRR 2-40 for level indication in electrically conductive or non-conductive liquids.
Safety note
The equipment must only be installed and commissioned by qualified and adequately trained personnel.
Maintenance and retrofitting must only by performed by entrusted personnel who – through adequate training – have achieved a recognised level of competence.
Danger
When loosening the electrode live steam or hot water might escape. This presents the danger of severe 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.
If the internal ceramic insulation breaks, hot steam can escape through the lateral vent hole on the electrode body. This presents the risk of severe scalding. Do not stay near the electrode during operation.
Attention
The name plate indicates the technical specification of the equipment. Do not commission or operate equipment without a name plate.
ATEX (Atmosphère Explosible)
According to the European Directive 94/9/EC the equipment must not be used in explosion-risk areas.
Explanatory Notes
Scope of supply
NRG 26-40
1 Level electrode type NRG 26-40 1 Joint ring (of stainless steel 1.4301) D 27 x 32 to DIN 7603, bright annealed 1 Terminating resistor 120 1 Installation manual
4
Ω
Explanatory Notes continued
Description
The level electrode NRG 26-40 works according to the capacitance measurement principle. The NRG 26-40 is used for signalling different levels in conductive and non-conductive liquids:
■
Water level maintained within the control band defined by two preset limits.
Use level electrode NRG 26-40 in combination with level switch type NRS 2-40 or further system components. The level data are transferred to the level switch or another system component via the CAN data bus, adopting the CANopen protocol.
Function
The principle of capacitance measurement is applied to determine the level. The electrode rod and the vessel wall form the plates of a capacitor. If the level of the dielectric located between these two capacitor plates changes, the current which flows through the plates changes proportionally to the level. A dielectric is by definition 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.
At regular intervals the level electrode NRG 26-40 sends a data telegram to the level switch NRS 2-40 or level controller NRR 2-40. The data transfer is effected by means of a CAN bus according to DIN ISO 11898 using the CANopen protocol.
System components
NRS 2-40
Digital switching controller for level electrodes type NRG 26-40. Functions: Four liquid levels with one switchpoint each, MAX alarm, MIN alarm, pump ON, pump OFF with one switchpoint each, water level continuously within the predefined control band. Data exchange: CAN bus to DIN ISO 11898, using CANopen protocol.
NRR 2-40
Digital level controller for level electrodes type NRG 26-40. Functions: Four liquid levels with one switchpoint each, MAX alarm, MIN alarm, pump ON, pump OFF with one switchpoint each, water level continuously within the predefined control band. Data exchange: CAN bus to DIN ISO 11898, using CANopen protocol.
URB 1, URB 2
Control terminal & display unit. Functions: Parameterization and visual display (LCD). Data exchange: CAN bus to DIN ISO 11898, using CANopen protocol.
Design
NRG 26-40:
Screwed design ¾" BSP, EN ISO 228-1. Fig. 2
5
Technical data
NRG 26-40
Type Approval Nº
TÜV · WR · 04-399
Max. service pressure
32 bar g at 238°C
Connections
Screwed ¾" BSP, EN ISO 228-1
Materials
Case: Die cast aluminium 3.2161 (G AlSi8Cu3) Stem: S. S. 1.4571 (X6CrNiMoTi17-12-2) Measuring electrodes: S. S. 1.4401 (X5CrNiMo17-12-2) Electrode insulation: PTFE
Length supplied/measuring range see Fig. 2
Supply voltage
18 – 36 V DC
Current consumption
65 mA
Fuse
Thermal fuse T
= 80 °C
max
Hysteresis
-2 K
Data exchange
CAN bus acc. to DIN ISO 11898, CANopen protocol
Attenuation, signal output
19 sec.
Indicators and adjustors
1 green LED “C 1 red LED “b
an bus CommuniCation”
us fault”
1 10-pole code switch for node ID and baud rate settings
Electric connection
M 12 sensor connector, 5 poles, A-coded, M 12 sensor jack, 5 poles, A-coded
Protection
IP 65 to DIN EN 60529
Max. admissible ambient temperature
70 °C
Weight
approx. 2.5 kg
6
Technical data continued
H= mm
GESTRA AG
Münchener Str. 77 D-28215 Bremen
18-36 V DC
Betriebsanleitung beachten!
See installation instructions!
Voir instructions de montage!
Tmax = 70°C (158 °F)
IN/OUT: CAN-Bus
TÜV.WR. 04 - 399
PmaxPmax TmaxTmax
NRG 26 - 40
PN40 G3/4 NPT 1.4571 IP65
Niveauelektrode Level electrode
Électrode de niveau
32 bar (464psi)
238°C (460°F)
Node ID: __ __ __
VS-Nr.:
Mat-Nr.:391798
Corrosion resistance
When used for its intended purpose the safe functioning of the electrode will not be impaired by corrosion.
Sizing
The electrode body must not be subjected to sharp increases in pressure. Welds and flanges of the electrode are designed to withstand dynamic loading (bending and alternating stress). The dimensional allowances for corrosion reflect the latest state of technology.
Name plate / marking
Designation of the equipment
Fig. 1
7
Technical data continued
GESTRA SteamSys tems
GESTRA NRG 26-40
Dimensions NRG 26-40
337.5
1 2
3726
173
Depth: 70 mm
¾" EN ISO 228-1
3
140
1 2
1373 1477 1583 1688 1794 1899
1004 1110 1214 1319 1423 1528 1636 2156
1300 1400 1500 1600 1700 1800 1900
1000 1100 1200 1300 1400 1500 2000
Fig. 2
8
Design
B
GESTRASt eamSystems
GESTRA NRG 26-40
NRG 26-40
A
Fig. 3
Fig. 4
D
C
∅ 33
¾" DIN 228
B
N 1
N 10
0.5
9
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