Flowserve NRGT26-1 User Manual

GESTRA

GESTRA Steam Systems

NRGT 261 NRGT 261S

Installation Instructions 81021304

Level electrode NRGT 26-1, NRGT 26-1 S

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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

System description ................................................................................................................................. 5

Function .................................................................................................................................................5

Designs ..................................................................................................................................................5

Technical Data

NRGT 26-1, NRGT 26-1S ....................................................................................................................

Corrosion resistance ............................................................................................................................... 7

Sizing .....................................................................................................................................................7

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

Dimensions ............................................................................................................................................. 9

Design

NRGT 26-1, NRGT 26-1S ......................................................................................................................10

Key .......................................................................................................................................................12

Functional Elements

NRGT 26-1, NRGT 26-1S ......................................................................................................................11

Key .......................................................................................................................................................12

Installation

NRGT 26-1 ...........................................................................................................................................13

NRGT 26-1S .........................................................................................................................................13

Attention ...............................................................................................................................................13

Note .....................................................................................................................................................13

Tools .....................................................................................................................................................13

Examples of installation ........................................................................................................................ 14

Key .......................................................................................................................................................15

6, 7

Contents – continued –

Page

Wiring

NRGT 26-1, NRGT 26-1S ......................................................................................................................16

Wiring diagram ..................................................................................................................................... 16

Attention ...............................................................................................................................................16

Tools .....................................................................................................................................................16

Basic Setting

Factory setting NRGT 26-1 ....................................................................................................................17

Factory setting NRGT 26-1S .................................................................................................................. 17

Establish active measuring range (control range) ..................................................................................17

Attention ...............................................................................................................................................17

Commissioning

Danger .................................................................................................................................................18

Check wiring ........................................................................................................................................18

Apply mains voltage..............................................................................................................................18

Adjust lower measuring range ..............................................................................................................18

Adjust upper measuring range .............................................................................................................. 18

Note .....................................................................................................................................................18

Operation

NRGT 26-1, NRGT 26-1S ......................................................................................................................19

Note .....................................................................................................................................................19

Operational Malfunctions

Fault ﬁnding list for troubleshooting ......................................................................................................20

Decommissioning

Danger .................................................................................................................................................21

Disposal................................................................................................................................................21

Annex

Declaration of conformity ......................................................................................................................22

Important Notes

Usage for the intended purpose

Use level electrodes NRGT 26-1 and NRGT 26-1S only for indicating liquid levels.

Safety note

The equipment must only be installed 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.

Danger

When loosening the electrode steam or hot water might escape. This presents the danger of severe scalds to the whole body. It is essential not to mount or dismantle the electrode unless the boiler pressure is veriﬁed to be 0 bar. The electrode becomes hot during operation. Touching the hot equipment presents the risk of severe burns to hands and arms. All installation and maintenance work must only be performed when the equipment is cold.

The terminal strip of the NRGT 26-1 / NRGT 26-1S is live during operation. This presents the danger of electric shock. Cut off power supply before ﬁxing or removing the housing cover.

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 (Atmosphère Explosible)

According to the European Directive 94/9/EC the equipment must not be used in potentially explosive areas.

Explanatory Notes

Scope of supply

NRGT 261

1 Compact system type NRGT 26-1 with joint ring (of stainless steel 1.4301) D 27 x 32 to DIN 7603, bright annealed 1 Installation manual

NRGT 261S (for marine applications)

1 Compact system type NRGT 26-1S with ﬂange DN 50 (2"), PN 40 to DIN 2635 1 Installation manual

System description

The compact system NRGT 26-1 works according to the capacitance measurement principle. The NRGT 26-1 is used for signalling different levels in electrically conductive and non-conductive liquids:

■

Level maintained within the control band deﬁned by two preset limits

The NRGT 26-1 has a level transmitter integrated in the electrode body which produces a standard signal of 4 -20 mA. External switchgear is not required.

Function

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.

Designs

NRGT 261:

Screwed design ¾" BSP, DIN ISO 228-1.

NRGT 261S: Flanged design for marine application DN 50, PN 40, DIN 2635. Fig. 3

Fig. 2

Technical Data

NRGT 261, NRGT 261S

Type Approval N°

NRGT 26-1: TÜV · WRS · 02-391 NRGT 26-1S: LR 98/20075 RINA ELE/30298/2 GL 99249-96HH BV 10617/AO BV NKK A-556 DNV A-8394 KR HMB 06190-MS002

Max. service pressure

32 bar g at 238 °C

Connections

NRGT 26-1: Screwed ¾" BSP, DIN ISO 228-1 NRGT 26-1 S: Flanged DN 50, PN 40, DIN 2635

Materials

Case: Die cast aluminium 3.2161 (G AlSi8Cu3) Stem: S. S. 1.4571 CrNiMoTi17-12-2 Flange: Forged steel 1.0460 P250GH Measuring electrodes: S. S. 1.4571 CrNiMoTi17-12-2 Electrode insulation: PTFE Spacer disc: PTFE (design for marine applications)

Mains supply

230 V +/- 10 %, 50/60 Hz 115 V +/- 10 %, 50/60 Hz (option)

224 V +/- 10 %, 50/60 Hz (option)

24 V DC

Length supplied / measuring range NRGT 261

1 Max. installation length at 238 °C 2 Measuring range

1 2 3 4

300

373

400

477

500

583

600

688

700

794

800

899

900

1004

1000

1110

1100

1214

1200

1319

1300

1423

1400

1528

1500

1636 2156

2000

See Fig. 2

NRGT 261 S

3 Max. installation length at 238 °C 4 Measuring range

316 420 526 631 737 842 947 1053 1157 1262 1366 1471 1579 2099

275 375 475 575 675 775 875 975 1075 1175 1275 1375 1475 1975

See Fig. 3

Technical Data – continued –

NRGT 261, NRGT 261S – continued –

Power consumption

5 VA, 3 VA at 24 V DC

Fuse

Thermal fuse T

Sensitivity

Range 1: Water Range 2: Water Range 3: Fuel oil EL

Output

4 – 20 mA level-proportional; electrically insulated, max. load 500 Ω Indicators and adjustors

2 red LEDs for “level 0 %” or “level 100 %” within the measuring range, 1 green LED for “level between 0 % and 100 %” of measuring range, 1 code switch for selecting the measuring range, 2 trimmer potentiometers for small-percentage adjustment of the measuring range, 2 terminal lugs for voltage measurement.

Cable entry

Cable gland with integral cable clamp 2 x M20 x 1.5

Protection

IP 65 nach DIN EN 60529

Max. admissible ambient temperature

70 °C (158 °F)

Weight

NRGT 26-1: approx. 1.8 kg NRGT 26-1S: approx. 8.0 kg

= 102 °C

max

≥ 0,5 µS/cm ≥ 20 µS/cm

εr 2,3

Corrosion resistance

Provided that the equipment is used for its intended purpose, its safety is not impaired by corrosion.

Sizing

The 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.

Technical Data – continued –

PN 40PN 40

IP 65IP 65

PmaxPmax TmaxTmax

NRGT 26-1 NRGT 26-1S

TÜV . WRS.

02-391

G ¾ 1.4571 DN 50 1.4571/1.0460DN 50 1.4571/1.0460

250 V ~ T 2,5 A250 V ~ T 2,5 A

Before removing cover isolate from power supplies See installation instructions

Avant d'ouvrir le couvercle dèconnecter complètement l'appareil Voir instructions de montage

32 bar (464psi) 238°C (453°F)

Tmax 70°C

(133°F)

Tmax 70°C

(133°F)

GL 99249-96 HH

Vor Öffnen des Deckels Gerät freischalten! Betriebsanleitung beachten

50 / 60 Hz 5VA

GB Reg. Design 2 053 113 US Pat. 5 719 342, Design 383 403

H= _ _ _ _ _ _ _ _ _ _ mm

4 - 20 mA / 500 

24 V 230 V115 V

GESTRA AG,

D-28215 Bremen

24 VDC

IP 65IP 65

PmaxPmax TmaxTmax

NRGT 26-1

TÜV . WRS.

02-391

PN 40 G ¾ 1.4571

250 V ~ T 2,5 A250 V ~ T 2,5 A

Before removing cover isolate from power supplies See installation instructions

Avant d'ouvrir le couvercle dèconnecter complètement l'appareil Voir instructions de montage

32 bar (464psi) 238°C (460°F)

Tmax

70°C

(158°F)

GL 99249-96 HH

Vor Öffnen des Deckels Gerät freischalten! Betriebsanleitung beachten

H= _ _ _ _ _ _ _ _ _ _ mm

4 - 20 mA / 500 

Ser.-Nr.: 316141

0525

GESTRA AG

Münchener Str. 77 D-28215 Bremen

3VA

Vers.XX

Name plate / marking

Fig. 1

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