Flowserve NRG16-41 User Manual

GESTRA

GESTRA Steam Systems

NRG 16-41
NRG 17-41
NRG 19-41

Installation Instructions 810743-01

Level Electrode NRG 16-41
Level Electrode NRG 17-41
Level Electrode NRG 19-41



1

Contents

Page

Important Notes

Usage for the intended purpose ..............................................................................................................4

Safety note .............................................................................................................................................4

Danger ...................................................................................................................................................4

Attention .................................................................................................................................................4

ATEX (Atmosphère Explosible) .................................................................................................................4

Explanatory Notes

Scope of supply ...................................................................................................................................... 5

Description .............................................................................................................................................5

Function .................................................................................................................................................6

System components ...............................................................................................................................6

Design .................................................................................................................................................... 6

Technical Data

NRG 16-41, NRG 17-41, NRG 19-41 .......................................................................................................

Corrosion resistance ............................................................................................................................... 8

Sizing .....................................................................................................................................................8

Name plate / marking .............................................................................................................................8

Dimensions NRG 16-41, NRG 17-41 .......................................................................................................

Dimensions NRG 19-41 ........................................................................................................................10

Design

NRG 16-41, NRG 17-41, NRG 19-41 ..................................................................................................... 11

Key .......................................................................................................................................................13

Functional Elements

NRG 16-41, NRG 17-41, NRG 19-41 ..................................................................................................... 12

Key .......................................................................................................................................................13

Installation

NRG 16-41, NRG 17-41, NRG 19-41, step 1 ..........................................................................................14

NRG 16-41, NRG 17-41, NRG 19-41, step 2 ..........................................................................................14

Attention ...............................................................................................................................................14

Note .....................................................................................................................................................14

Tools ..................................................................................................................................................... 14

Examples of installation NRG 16-41, NRG 17-41, NRG 19-41 ................................................................15

Key .......................................................................................................................................................16

7

9

2

Contents continued

Page

Wiring

NRG 16-41, NRG 17-41, NRG 19-41 ..................................................................................................... 17

Aligning terminal box ............................................................................................................................ 17

Note .....................................................................................................................................................17

Wiring diagram ..................................................................................................................................... 18

Attention ...............................................................................................................................................19

Tools ..................................................................................................................................................... 19

Basic Settings

CAN bus ...............................................................................................................................................20

Node ID ................................................................................................................................................20

Attention ...............................................................................................................................................20

Factory set default values .....................................................................................................................20

Factory set default node IDs ..................................................................................................................21

Assigning / changing node ID ................................................................................................................21

Attention ...............................................................................................................................................21

Setting code switch ..............................................................................................................................22

Commissioning Procedure

Check wiring ........................................................................................................................................23

Apply mains voltage..............................................................................................................................23

Operation

High-water level limiter (Max alarm) .....................................................................................................23

Note .....................................................................................................................................................23

Malfunctions

Fault finding list for troubleshooting ...................................................................................................... 24

Annex

Declaration of conformity ......................................................................................................................25

3

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 as high-water level limiter (high-level alarm).

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.

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.

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.

4

Explanatory Notes

Scope of supply

NRG 16-41

1 Level electrode type NRG 16-41
1 S. S. joint ring D 27 x 32 mm to DIN 7603 (made of 1.4301), bright annealed
1 Terminating resistor 120
1 Installation manual

NRG 17-41

1 Level electrode type NRG 17-41
1 S. S. joint ring D 27 x 32 mm to DIN 7603 (made of 1.4301), bright annealed
1 Terminating resistor 120
1 Installation manual

NRG 19-41

1 Level electrode type NRG 19-41
1 S. S. joint ring D 27x32 mm to DIN 7603 (made of 1.4301), bright annealed
1 Terminating resistor 120
1 Installation manual

Description

Ω

Ω

Ω

The level electrode operation is based on the conductive measuring principle. The NRG 1...-41 is
designed for signalling the max. liquid level in electrically conductive liquids.

■ One liquid level with one switchpoint
The NRG 1...-41 is to be used in conjunction with the switching controller NRS 1-41 and further

system components.
NRG 1...-41 in conjunction with the associated control equipment constitutes a water level limiter

with periodic self-testing routine (SMART function) in accordance with TRD 604, sheet 1 and 2 and EN
regulations. The level data are transferred from the electrode NRG 1...-41 to the control equipment via
a CAN bus using the CANopen protocol.

5

Explanatory Notes continued

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 sends a data telegram to the switching controller
NRS 1-41. The data are transferred via a CAN bus to DIN ISO 11898 using the CANopen protocol.

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.

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 17-41, NRG 19-41:

Screwed ¾", EN ISO 228-1. Fig. 2,

6

Fig. 3

Technical Data

NRG 16-41, NRG 17-41, NRG 19-41

Type Approval

TÜV · SWB / SHWS · 02-403
EG BAF-MUC 02 02 103881 002

Service pressure
NRG 16-41 NRG 17-41 NRG 19-41

32 bar g at 238 °C 60 bar g at 275 °C 100 barg at 311°C

Connection

Screwed ¾", EN ISO 228-1

Materials

Terminal box: Die cast aluminium 3.2161 (G AlSi8Cu3)
Enclosure: 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)

Current consumption

35 mA

Fuse

Electronic thermal fuse T

= 85 °C

max

Hysteresis

-2 K

Electrode voltage

2 V

ss

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 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

7

Technical Data continued

18-36 V DC0,5 µS/cm>

Betriebsanleitung
beachten!

See installation instructions!

Voir instructions de
montage!

Tmax = 70°C (158 °F)

IN/OUT: CAN-Bus

PN 63

PN160

PN 40

PmaxPmax
TmaxTmax

NRG 17-41
NRG 19-41

NRG 16-41

G 3/4 1.4571 IP65

60 bar (870psi)
275°C (527°F)

32 bar (464psi)
238°C (460°F)

100 bar (1450psi)

311°C (592°F)

Node ID: __ __ __

VS-Nr.: XX

Mat-Nr.: 392151

TÜV . SWB / SHWS .

02 - 403

0525

GESTRA AG

Münchener Str. 77
D-28215 Bremen

Corrosion resistance

When used for its intended purpose the safe functioning of the electrode will not be impaired by
corrosion.

Sizing

The electrode body is nor designed for pulsating loads. 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

8

GESTRASt eamSystems

GESTRA
NRG 1...-41

MAX

Technical Data continued

Dimensions NRG 16-41, NRG 17-41

175

140

337.5

F.

mm

A.

≥ 185

Fig. 2

50

¾" BSP, EN ISO 228-1

30

1500,

1000,

1500

9