GESTRA NRG 26-40 User manual
1
EN
English
Original Installation Instructions
810274-05
Level electrode
NRG 26-40
2
Contents
Page
Important notes
Usage for the intended purpose...............................................................................................................4
Function..................................................................................................................................................4
Safety note..............................................................................................................................................4
System components................................................................................................................................5
Directives and Standards
VdTÜV Bulletin "Wasserüberwachung 100" (= Water Monitoring 100).....................................................6
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)........................................................6
ATEX (Hazardous Area) ............................................................................................................................6
UL/cUL (CSA) Approval ............................................................................................................................6
Note on the Declaration of Conformity / Manufacturer's Declaration ............................................6
Technical Data
NRG 26-40 ............................................................................................................................................7
Technical Data
Name plate/marking ...............................................................................................................................8
Scope of supply ....................................................................................................................................8
Installation
Dimensions NRG 26-40.........................................................................................................................10
NRG 26-40............................................................................................................................................11
Key .......................................................................................................................................................11
Tools.....................................................................................................................................................11
Examples of installation
NRG 26-40............................................................................................................................................12
Key .......................................................................................................................................................13
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Contents - continued -
Page
Electrical connection
NRG 26-40............................................................................................................................................14
Key .......................................................................................................................................................14
Connection of level electrode ................................................................................................................15
Connection of level electrode ................................................................................................................15
Tools.....................................................................................................................................................15
Wiring diagram and pin assignments of connector / jack.......................................................................16
Key .......................................................................................................................................................16
CAN bus wiring diagram........................................................................................................................17
CAN bus voltage supply.........................................................................................................................18
Basic settings
Bus line.................................................................................................................................................18
Node ID.................................................................................................................................................19
Factory setting ......................................................................................................................................20
Establishing / changing node ID ............................................................................................................20
Code switch settings.............................................................................................................................21
Commissioning procedure
Applying supply voltage.........................................................................................................................22
Setting measuring range......................................................................................................................22
Operation
Setting the attenuation of the level signal..............................................................................................23
Troubleshooting
Indication, diagnosis and remedy ..........................................................................................................24
Further Notes
Action against high frequency interference............................................................................................25
Maintenance
Safety note............................................................................................................................................26
Cleaning the electrode rod ....................................................................................................................26
Removing and disposing of the level electrode
Removing and disposing of level electrode NRG 26-40..........................................................................26
4
Important notes
Usage for the intended purpose
The level electrode NRG 26-40 is used for continuous level monitoring in steam boilers and (pressur-
ized) hot-water installations or in condensate and feedwater tanks.
In conjunction with the level switch NRS 2-40 and the level controller NRR 2-40 the electrode can be
used for instance as water level controller with MIN/MAX alarm.
The level electrode is designed for use in conjunction with the following level switches/controllers:
NRS 2-40 and NRR 2-40.
The level electrode can be used in electrically conductive and non-conductive fluids.
Function
The level electrode NRG 26-40 consists of a level measuring electrode and an electronic module in
the terminal box.
The level electrode works according to the capacitance measurement principle and translates the level
changes into a data telegram, with the length of the electrode rod determining the measuring range.
The level electrode is installed inside steam boilers, vessels or in an external level pot. If the electrode
is installed inside the boiler or vessel, a protection tube provided on side ensures correct functioning
(see section Examples of installation (pages 12, 13).
The level electrode can be installed together with one GESTRA level electrode for water level limiting or
for high-level alarm in a single protection tube or external level pot.
At regular intervals the level electrode NRG 26-40 sends a data telegram to the control equipment
NRS 2-40 and NRR 2-40 or other system components. Data is transferred by means of a CAN bus
according to DIN ISO 11898 using the CANopen protocol.
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.
The equipment 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.
5
Important notes
System components
NRS 2-40
Digital switching controller for level electrode NRG 26-40.
Functions: Four liquid levels with one switchpoint each, MAX alarm, MIN alarm, pump ON, pump OFF
with one switchpoint each, liquid level continuously within the predefined control band of the electrode.
Data exchange: CAN bus to ISO 11898 via CANopen protocol.
NRR 2-40
Digital switching controller for level electrode NRG 26-40.
Functions: Two level limits with one switchpoint each (high-level alarm, low-level alarm).
Three-position or modulating control within a predefined proportional band.
Water level monitoring within the defined control band of the electrode.
Data exchange: CAN bus to ISO 11898 via CANopen protocol. Two level limits with one switchpoint
each (high-level alarm, low-level alarm).
URB 1, URB 2
Operating & display unit.
Functions: Parameterization and visual indication via LCD display.
Data exchange: CAN bus to ISO 11898 via CANopen protocol.
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.
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6
For details on the conformity of our equipment with European Directives, please refer to our
Declaration of Conformity or our Manufacturer's Declaration.
The current Declaration of Conformity / Manufacturer's Declaration is available at
www.gestra.com Documents
, or can be requested from us.
Directives and Standards
VdTÜV Bulletin "Wasserüberwachung 100" (= Water Monitoring 100)
The level electrode NRG 26-40 in conjunction with the following control equipment is type approved
according to VdTÜV Bulletin "Wasserstand 100": NRS 2-40 and NRR 2-40.
The VdTÜV Bulletin "Wasserstand (=Water Level) 100" specifies the requirements made on water level
control and limiting equipment for boilers.
ATEX (Hazardous Area)
According to the European Directive 2014/34/EU the equipment must not be used in potentially
explosive areas.
Note on the Declaration of Conformity / Manufacturer's Declaration
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The equipment meets the requirements of the Low Voltage Directive 2014/35/EU and the EMC
Directive 2014/30/EU.
UL/cUL (CSA) Approval
The equipment complies with the requirements of the following standards: UL 508 and CSA C22.2
No. 14-13, Standards for Industrial Control Equipment. File E243189.
7
NRG 26-40
Technical Data
Service pressure
PN 40, 32 bar at 238°C
Mechanical connection
NRGT 26-1: Screwed G ¾A, ISO 228
Materials of construction
Screw-in body: 1.4571, X6CrNiMoTi17-12-2
Electrode rod insulation: PTFE
Terminal box: 3.2161 G AlSi8Cu3
Length of installation
at 238°C
373 477 583 688 794 899 1004 1110
Measuring range 300 400 500 600 700 800 900 1000
Length of installation
at 238°C
1214 1319 1423 1528 1636 2156
Measuring range 1100 1200 1300 1400 1500 2000
Weight
approx. 2.5 kg
Electronic module
supply voltage
18–36 V DC)
Power consumption
65 mA
Fuse
Thermal fuse Tmax = 80°C
Hysteresis
-2 K
Data exchange
CAN bus to ISO 11898, CANopen protocol
Attenuation of signal output
19 seconds
Indicators and adjustors
1 10-pole code switch for node ID and baud rate setting
1 green LED "Communication CAN bus"
1 red LED "Malfunction in bus"
Electrical 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
Max. 70 °C
8
Technical Data
Storage and transport temperature
– 40 to + 80 °C
Approvals:
TÜV certificate VdTÜV Bulletin "Water Level 100"
Requirements made on water level limiting & control equipment.
Type approval: TÜV · WR · XX-399 (see name plate)
NRG 26-40
Name plate/marking
Fig. 1
Manufacturer
Equipment designation,
Pressure rating, connection,
material number, protection
Pressure/temperature range
CAN bus data
Measuring range
CE marking
Safety note
Disposal note
Type approval no.
Scope of supply
NRG 26-40
1 Level electrode type NRG 26-40
1 Joint ring 27 x 32, form D, DIN 7603, 1.4301, bright annealed
1 Installation manual
Betriebsanleitung
beachten
See installation instructions
Hier öffnen
Open here
Ouvririci
Voir instructionsde
montage
18-36 VDC
Tamb = 70°C (158°F)
IN/OUT: CAN-Bus
Pmax
Tmax
NRG 26-40
PN40 G3/4 1.4571 IP65
32 bar (464psi)
238°C (460°F)
__ __ __
GESTRA AG
Münchener Str.77
D-28215 Bremen
TÜV ·WR·XX - 399
H= mm
Niveauelektrode
Level electrode
Électrode de niveau
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9
Installation
Note
The level electrode NRG 26-40 can be installed together with one GESTRA level elec-
trode for water level limiting or for high-level alarm in a single protection tube or exter-
nal level pot (inside diameter 100 m). Fig. 5 - 8. If the level limiting electrode is installed
inside the vessel, it must be at least 40 mm away from the upper vent hole.
For the approval of the boiler standpipe the relevant regulations must be considered.
Refer to pages 12 – 13 for typical installation examples.
The angle of inclination of the electrode must not exceed 45°, with the length of the
electrode rod being limited to 688 mm. Fig. 8
The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, Fig. 3!
Do not bend electrode rod when mounting.!
Do not subject electrode rod to physical shocks.
Use only the supplied joint ring!
27 x 32, form D, DIN 7603, 1.4301, bright annealed
Do not lag electrode body above the hexagonal section!
Do not insulate electrode thread with hemp or PTFE tape!
Do not apply conductive paste or grease to the electrode thread!
Observe the minimum distances for the installation of the electrode!
Observe the specified tightening torque.
Do not cut the electrode rod.
Attention
10
GESTRA Steam Systems
GESTRA
Installation
Dimensions NRG 26-40
Fig. 2
NRGT 26-1
173
b = 68
336
6
3
5
Ra 3.2
0.5
Fig. 3
4
140
37
26
NRG 26-40
1 2
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
Screwed G ¾ A, ISO 228
∅ 15
12
Ra 3.2
0.5
∅ 33
Screwed G ¾ A,
ISO 228
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