GESTRA NRG 16-41 User manual

1
EN
English
Original Installation Instructions
810743-04
Level Electrode
NRG 16-41
NRG 16-41.1
NRG 17-41
NRG 17-41.1
NRG 19-41
NRG 19-41.1

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Contents
Page
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
Explanatory Notes
Scope of supply......................................................................................................................................5
Description .............................................................................................................................................5
Function .................................................................................................................................................6
System components ...............................................................................................................................6
Design....................................................................................................................................................6
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, -41.1, step 1...........................................................14
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, -41.1, step 2...........................................................14
Attention...............................................................................................................................................14
Note .....................................................................................................................................................14
Tools.....................................................................................................................................................14
Examples of installation NRG 16-41.1, NRG 17-41.1, NRG 19-41.1.......................................................15
Key.......................................................................................................................................................16
Installation
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, -41.1 ........................................................................7
Name plate / marking .............................................................................................................................8
Dimensions NRG 16-41, -41.1; NRG 17-41, -41.1...................................................................................9
Dimensions NRG 19-41, -41.1..............................................................................................................10
Technical Data
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, -41.1 ......................................................................11
Key.......................................................................................................................................................13
Design
NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, -41.1 ......................................................................12
Key.......................................................................................................................................................13
Functional Elements

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Electrical Connection
Aligning terminal box............................................................................................................................17
Note .....................................................................................................................................................17
Control cable ........................................................................................................................................17
Wiring diagram.....................................................................................................................................18
Wiring diagram for the sensor plug-in connections ...............................................................................19
Key.......................................................................................................................................................19
CAN bus wiring diagram .......................................................................................................................20
Attention...............................................................................................................................................20
Note .....................................................................................................................................................21
Tools.....................................................................................................................................................21
Contents – continued –
Page
Malfunctions
Fault finding list for troubleshooting......................................................................................................26
Operation
High-water level limiter (Max alarm) .....................................................................................................25
Note .....................................................................................................................................................25
Commissioning Procedure
Check wiring ........................................................................................................................................25
Apply mains voltage..............................................................................................................................25
Basic Settings
CAN bus ...............................................................................................................................................21
Node ID ................................................................................................................................................22
Factory set default values .....................................................................................................................23
Assigning / changing node ID................................................................................................................23
Attention...............................................................................................................................................23
Code switch settings.............................................................................................................................24

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Important Notes
Usage for the intended purpose
Use level electrode type NRG 16-41, NRG 17-41 or NRG 19-41 only in conjunction with control
equipment NRS 1-41 or NRS 1-40.1 as high-water level limiter (high-level alarm).
Use level electrode type NRG 16-41.1, NRG 17-41.1 or NRG 19-41.1 only in conjunction with control
equipment NRS 1-40.1 as high-water level limiter (high-level alarm).
Danger
When loosening the electrode steam or hot water might escape.
This presents the danger of severe scalding. It is therefore essential not to remove
the electrode unless the boiler pressure is verified to be zero.
The electrode is hot during operation. This presents the danger 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.
Safety note
The equipment must only be installed and commissioned by qualified staff.
Maintenance and service work must only be performed by adequately trained persons who have
a recognized level of competence.
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 2014/34/EU the equipment must not be used in explosion-risk 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.com/documents or can be requested from us.

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Explanatory Notes
Scope of supply
NRG 16-41, NRG 16-41.1
1 Level electrode type NRG 16-41 or NRG 16-41.1
1 S. S. joint ring D 27 x 32 mm to DIN 7603 (made of 1.4301), bright annealed
1 Terminating resistor 120 Ω
1 Installation manual
NRG 17-41, NRG 17-41.1
1 Level electrode type NRG 17-41 or NRG 17-41.1
1 S. S. joint ring D 27 x 32 mm to DIN 7603 (made of 1.4301), bright annealed
1 Terminating resistor 120 Ω
1 Installation manual
NRG 19-41, NRG 19-41.1
1 Level electrode type NRG 19-41 or NRG 19-41.1
1 S. S. joint ring D 27 x 32 mm to DIN 7603 (made of 1.4301), bright annealed
1 Terminating resistor 120 Ω
1 Installation manual
Description
The level electrode operation is based on the conductive measuring principle.
The NRG 1...-41 and NRG 1...-41.1 are designed for signalling the max. liquid level in electrically
conductive liquids.
nOne liquid level with one switchpoint
The NRG 1...-41 is to be used in conjunction with the switching controller NRS 1-41 or NRS 1-40.2,
the NRG 16-41.1 is designed for use with switching controller NRS 1-40.1.
The level data are transferred from the electrode NRG 1...-41 and NRG 1...-41.1 to the control equip-
ment via a CAN bus using the CANopen protocol.

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Explanatory Notes – continued –
System components
NRS 1-41
Digital switching controller for high-level limiter NRG 1...-41
Functions: High-level alarm (Max)
Data exchange: CAN bus to DIN ISO 11898 using CANopen protocol.
NRS 1-40.1
Digital multi-purpose switching controller for high-level limiter NRG 1...-41.1, the low-level electrode
NRG 1...-40 and the temperature limiter TRV 5-40
Functions: Signalling high-level alarm (Max), low-level alarm (Min)
Data exchange: CAN bus to DIN ISO 11898 using CANopen protocol.
NRS 1-40.2
Digital multi-purpose switching controller for high-level limiter NRG 1...-41 and the
temperature limiter TRV 5-40
Functions: Signalling high-level alarm (Max)
Data exchange: CAN bus to DIN ISO 11898 using CANopen protocol.
URB 1, URB 2
Control terminal and display unit
Functions: Parameterization and visual display (LCD)
Data exchange: CAN bus to DIN ISO 11898 using CANopen protocol.
Design
NRG 16-41, NRG 16-41.1, NRG 17-41, NRG 17-41.1, NRG 19-41, NRG 19-41.1:
Screwed ¾", EN ISO 228-1. Fig. 2, Fig. 3
Function
The conductivity of the liquid is used to signal the liquid level. Some liquids are conductive, which
means that they allow an electric current to flow through them. For the safe functioning of this device a
minimum conductivity of the liquid to be measured is required.
The conductivity measurement method can detect two conditions: electrode rod submerged or
exposed, meaning switchpoint reached (or exceeded) or not yet reached. Before installation, the length
of the electrode rod must be cut to the required switching level, e. g. for “Pump off” or “Control valve
closed” or, in case of economiser and air heaters that are installed close to the steam-generating unit
and exposed to a risk, “Firing/Burner off”.
An additional electrode fully integrated in the system automatically monitors the electrical resistance
path between earth and measuring electrode. As soon as the actual value falls below the admissible
resistance value the protection circuit is interrupted and cuts off the pump or heat supply to the boiler.
At regular intervals the level electrode NRG 1...-41 / NRG 1...41.1 sends a data telegram to the
switching controller NRS 1-41, NRS 1...40.1. The data are transferred via a CAN bus to DIN ISO 11898
using the CANopen protocol.

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NRG 16-41, -41.1; NRG 17-41, -41.1; NRG 19-41, 19-41.1
Type Approval
TÜV · SWB / SHWS · ..-403
TÜV · SWB / SHWS · ..-413
Service pressure
NRG 16-41, NRG 16-41.1 NRG 17-41, NRG 17-41.1 NRG 19-41, NRG 19-41.1
32 bar g at 238 °C 46 bar g at 260 °C 100 bar g at 311 °C
Connection
Screwed ¾", EN ISO 228-1
Materials
Terminal box: Die cast aluminium 3.2161 (G AlSi8Cu3)
Sheath: 1.4301 X5 CrNi18-10
Screwed union: S. S. 1.4571 (X6CrNiMoTi17-12-2)
Measuring electrode: S. S. 1.4401 (X5CrNiMo17-12-2)
Electrode insulation: PEEK
Lengths supplied
500 mm, 1000 mm, 1500 mm
Sensitivity of response
> 0.5 µS/cm at 25 °C
Supply voltage
18 – 36 V DC (coming from NRS 1-41, NRS 1-40.1, NRS 1-40.2)
Current consumption
35 mA
Fuse
Electronic thermal fuse Tmax = 85 °C
Hysteresis
-2 K
Electrode voltage
2 Vss
Data exchange
CAN bus to DIN ISO 11898, CANopen Protocol
Indicators and adjustors
One 10-pole code switch for setting node ID and baud rate
Two LEDs “PrograM running”
Two LEDs “can bus coMMunication”
Electric connection
M 12 sensor plug, 5 poles, A-coded,
M 12 sensor socket, 5 poles, A-coded
Protection
IP 65 to DIN EN 60529
Max. admissible ambient temperature
70 °C
Weight
Approx. 2.5 kg
Technical Data

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Technical Data – continued –
Name plate / Marking
Fig. 1
Betriebsanleitung
beachten
See installation instructions
Hier öffnen
Open here
Ouvrir ici
Voir instructions de
montage
18-36 V DC
Tamb = 70°C (158°F)
IN/OUT: CAN-Bus
PN 63
PN 160
PN 40
Pmax
Tmax
NRG 17 - 41.1
NRG 19 - 41.1
NRG 16 - 41.1
G 3/4 1.4571 IP65
46 bar (667psi)
260°C (500°F)
32 bar (464psi)
238°C (460°F)
100 bar (1450psi)
311°C (592°F)
Node ID: __ __ __
0525
GESTRA AG
Münchener Str. 77
D-28215 Bremen
TÜV . SWB/SHWS
STW(STB) . xx - 413
0,5 µS/cm>
Betriebsanleitung
beachten
See installation instructions
Hier öffnen
Open here
Ouvrir ici
Voir instructions de
montage
18-36 V DC
Tamb = 70°C (158°F)
IN/OUT: CAN-Bus
PN 63
PN 160
PN 40
Pmax
Tmax
NRG 17 - 41
NRG 19 - 41
NRG 16 - 41
G 3/4 1.4571 IP65
60 bar (870psi)
260°C (500°F)
32 bar (464psi)
238°C (460°F)
100 bar (1450psi)
311°C (592°F)
Node ID: __ __ __
0525
GESTRA AG
Münchener Str. 77
D-28215 Bremen
TÜV. SWB / SHWS . xx - 403
TÜV . SWB/SHWS
STW(STB) . xx - 413

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GESTRA Steam Systems
GESTRA
NRG 1...-41.1
MAX
Fig. 2
¾" EN ISO 228-1
1500, 1000, 1500
140
337.5
≥ 185
Technical Data – continued –
Dimensions NRG 16-41, -41.1; NRG 17-41, -41.1
175
85
30

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GESTRA Steam Systems
GESTRA
NRG1...-41.1
MAX
Fig. 3
¾" EN ISO 228-1
1500, 1000, 1500
175
140
419
30
≥185
120
Technical Data – continued –
Dimensions NRG 19-41, -41.1