Flowserve NRGS 11-2 User Manual

GESTRA Steam Systems

NRGS 11-2 NRGS 16-2

Installation Instructions 810366-01

Level Electrode Types NRGS 11-2, NRGS 16-2



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 ......................................................................................................................................4

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

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

Design ....................................................................................................................................................5

Technical Data

NRGS 11-2, NRGS 16-2 ......................................................................................................................

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

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

Name/marking ........................................................................................................................................7

Dimensions ............................................................................................................................................. 8

Design

NRGS 11-2, NRGS 16-2 .......................................................................................................................... 9

Key ....................................................................................................................................................... 11

Functional Elements

NRGS 11-2, NRGS 16-2 ........................................................................................................................ 10

Key ....................................................................................................................................................... 11

Installation

NRGS 11-2, NRGS 16-2 ........................................................................................................................12

Table 1 .................................................................................................................................................12

Attention ...............................................................................................................................................12

Note .....................................................................................................................................................12

Tools .....................................................................................................................................................12

Example of installation ..........................................................................................................................13

Key .......................................................................................................................................................14

5, 6

Contents continued

Page

Wiring

NRGS 11-2, NRGS 16-2 ........................................................................................................................ 15

Wiring diagram .....................................................................................................................................15

Attention ...............................................................................................................................................15

Tools .....................................................................................................................................................15

Basic Settings

Factiory settings ..................................................................................................................................16

Switch selection fo measuring range ....................................................................................................16

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

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

Commissioning

Warning ................................................................................................................................................17

Wiring check ......................................................................................................................................... 17

Application of mains voltage ................................................................................................................. 17

Check assignment of switching functions .............................................................................................17

Check low-level alarm .......................................................................................................................... 17

Operation

Resetting low-level alarm .....................................................................................................................17

Troubleshooting

Fault ﬁnding list .................................................................................................................................... 18

Annex

Declaration of conformity ......................................................................................................................19

Important Notes

Usage for the intended purpose

Use level electrodes NRGS 11-2 and NRGS 16-2 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 NRGS 11-2, NRGS 16-2 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

NRGS 11-2

1 Compact system type NRGS 11-2 1 Joint ring (of stainless steel 1.4301) D 33 x 39 to DIN 7603 1 Installation manual

NRGS 16-2

1 Compact system type NRGS 16-2 1 Joint ring (of stainless steel 1.4301) D 33 x 39 to DIN 7603 1 Installation manual

Explanatory Notes continued

System description

The compact system NRGS 11-2, NRGS 16-2 works according to the conductivity measurement prin ciple. With the NRGS 11-2, NRGS 16-2 a maximum of 3 levels can be signalled in conductive liquids:

■ Low level alarm, pump ON, pump OFF with a normally open contact The NRGS 11-2 / NRGS 16-2 has its level switch integrated in the electrode case for the control of all

functions. An external switching device is not required. The NRGS 11-2 / NRGS 16-2 has two electrode tips for the detection of low water level. The signalling

of the low-level alarm is effected via two separate switching channels.

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 tip submerged or exposed, meaning switchpoint reached or not reached. Before installation, the length of the electrode tip must be cut to the required switching levels, e. g. for max./min. alarm, controlling of a valve or pump.

Designs

NRGS 11-2: Screwed design 1" BSP, EN ISO 228-1, PN 6. NRGS 16-2: Screwed design 1" BSP, EN ISO 228-1, PN 40. Fig. 1

Technical Data

NRGS 11-2, NRGS 16-2

Type approval n°

TÜV · WR/WB · 02-392

Max. service pressure

NRGS 11-2: 6 bar g at 159°C, NRGS 16-2: 32 bar g at 238 °C

Connections

Screwed 1", EN ISO 228-1

Materials Terminal box Die cast aluminium 3.2161 G AlSi8Cu3

Stem

S.S. 1.4571 CrNiMoTi17-12-2 Housing 1.4571 Flange Forget steel 1.0460 C22.8

Measuring electrodes Electrode insulation PTFE Spacer disc PTFE

S.S. 1.4571 CrNiMoTi17-12-2

Technical Data continued

NRGS 11-2, NRGS 16-2 continued

Lengths supplied

500 mm 1000 mm 1500 mm

Mains supply

230 V +/– 10%, 50/60 Hz 115 V +/– 10%, 50/60 Hz 24 V +/– 10%, 50/60 Hz (option)

Power consumption

5 VA

Fuse Thermal fuse T

Sensitivity

Range 1: 10 µS/cm Range 2: 0.5 µS/cm

Electrode voltage

10 V

Output

4 volt-free relay contacts for low level alarm, 1 normally open contact (e.g. for pump). Max. contact rating with a switching voltage of 24 V, 115 V and 230 V a. c.: resistive 4 A, inductive 0.75 A at cos ϕ 0.5. Max contact rating with a switching voltage of 24 V d. c.: 4 A. Contact material: silver, hard-gold plated.

Indicators and adjustors

2 red LEDs for signalling “Low water”, 1 green LED for signalling “Pump ON”, 1 four-pole code switch for changing sensitivity, 1 button “TEST” for checking low-level alarm 1 button “RESET” for resetting the low-level alarm

Cable entry

Cable gland with integral cable clamp

M 16 (PG 9) M 20 (PG 16)

Protection IP 65 to DIN 40050

Max. admissible ambient temperature

70 °C

Weight

approx. 0.8 kg

= 102 °C

max

+ 14 hidden pages