Flowserve NRGS 16-1 User Manual

NRGS 16-1
NRGS 16-1S

Installation Instructions 810211- 00

Level electrode NRGS 16-1, NRGS 16-1S

A Siebe Group Product

1

Dimensions

337.5500, 1000, 1500

173

140

173

140

339

42

62

2

Fig. 1

500, 1000, 1500

Fig. 2

NRGS 16-1/S

AA

A

AA

BB

B

BB

DD

D

DD

50

CC

C

CC

Fig. 4

∅ 40

1" BSP DIN 228

N10

≥14

N8

65–70

0.5

Fig. 5Fig. 3

3

NRGS 16-1/S

MAX 70°C

MAX 95%

Fig. 6

EE

E

EE

FF

F

FF

Fig. 7

GG

G

GG

II

KK

I

K

II

HH

H

HH

QQ

Q

QQ

PP

P

PP

OO

O

OO

NN

N

NN

KK

LL

L

JJ

J

JJ

MM

M

MM

LL

4

Legend

AA

A

AA

Electrode thread 1" BSP, DIN 228

BB

B

BB

Seating surface

CC

C

CC

Joint ring (of stainless steel 1.4301) D 33 x39 to DIN 7603

DD

D

DD

Flange DN 50 (2"), PN 40 to DIN 2635

EE

E

EE

Housing screws M4

FF

F

FF

Cable entry PG 9 /PG 16

GG

G

GG

Housing cover

HH

H

HH

LED “MIN”

II

I

II

LED “Pump ON”

JJ

J

JJ

LED “Pump OFF”

KK

K

KK

LED “MAX”

LL

L

LL

DIP switch “Measuring range”

MM

M

MM

Terminal strip

NN

N

NN

PE connection

OO

O

OO

Terminal strip ‘Test’

PP

P

PP

Thermal fuse T

QQ

Q

Screw

QQ

102°C

max

5

Contents

Page

Important Notes

Safety Note .....................................................................................................................7

Danger ............................................................................................................................7

Warning...........................................................................................................................7

Explanatory Notes

Scope of supply ..............................................................................................................8

System description..........................................................................................................8

Function ..........................................................................................................................8

Designs ...........................................................................................................................8

Technical data ...........................................................................................................9, 10

Installation

NRGS 16-1 ............................................................................................................ 10, 11

NRGS 16-1S (for marine applications) ................................................................... 10, 11

Table Functions............................................................................................................. 11

Examples of installation ................................................................................................17

Wiring

NRGS 16-1, NRGS 16-1S ............................................................................................12

Standard Setting

Factory setting ..............................................................................................................13

Switch selection of measuring range ............................................................................13

Commissioning

Warning.........................................................................................................................14

Wiring check .................................................................................................................14

Application of mains voltage .........................................................................................14

Checking of switching functions ....................................................................................14

Annex

Warning.........................................................................................................................15

Fault finding list .............................................................................................................15

Declaraction of conformity ............................................................................................16

6

Important Notes

Safety Note

Use compact system for level monitoring type NRGS 16-1 and NRGS 16 -1S only for
level indication. Installation must only be performed by qualified staff.
Qualified staff are those persons who – through adequate training in electrical
engineering, the use and application of safety equipment in accordance with
regulations concerning electrical safety systems, and first aid & accident prevention –
have achieved a recognised level of competence appropriate to the installation and
commissioning of this device.

Danger

When loosening the electrode live steam or hot water might escape.
This presents the danger of severe injury. It is therefore essential not to
dismantle the electrode unless the boiler pressure is verified to be zero.

Warning

The terminal strip of the NRGS 16-1/ NRGS 16-1S is live during operation.
This presents the danger of electric shock. Cut off power supply before
fixing or removing the housing cover.

7

Explanatory Notes

Scope of Supply
NRGS 16 -1

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

NRGS 16 -1S

1 Compact system type NRGS 16-1 S (for marine application)
1 Flange DN 50 (2"), PN 40 to DIN 2635
1 Installation Instr uction

System Description

The compact system NRGS 16-1/ NRGS 16-1S works according to the conductivity
measurement principle.

With the NRGS 16-1/ NRGS 16-1S a maximum of 4 levels can be signalled in
conductive liquids:

■

4 Levels with one switchpoint each

■

MAX alarm, MIN alarm, pump ON, pump OFF with one switchpoint each.

The NRGS 16-1/ NRGS 16-1S has a level switch integrated in the electrode case
for the controlling of all functions. An external switching device is not required.

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

Designs
NRGS 16-1:

Screwed design 1" BSP, DIN ISO 228. Fig. 1
NRGS 16-1S:

Flanged design for marine application DN 50, PN 40, DIN 2635. Fig. 2

8

Technical Data
Type Approval N°

NRGS 16 -1: TÜV · WRB · 96-388
NRGS 16 -1S: GL 99250-96 HH

Max. service pressure

32 barg at 238 °C

Connections

Screwed 1" BSP, DIN ISO 228
Flanged DN 50, PN 40, DIN 2635

Materials

Case: Die cast aluminium 3.2161 (G AlSi8Cu3)
Stem: S.S. 1.4571 (CrNiMoTi 17 12 2)
Flange: Forged steel 1.0460 (C 22.8)
Measuring electrodes: S.S. 1.4571 (CrNiMoTi 17 12 2)
Electrode insulation: PTFE
Spacer disc: PTFE

Lengths supplied

1500 mm

1000 mm
1500 mm

Mains supply

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

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

Power consumption

5 V A

Fuse

Thermal fuse T

= 102°C

max

Sensitivity

Range 1: 10
Range 2: 0.5

µ

S/cm

µ

S/cm

Electrode voltage

10 V

ss

Output

4 volt-free relay contacts.
Max. contact rating with a switchting voltage of 24 V, 115 V and 230 V a. c.: ohmic 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

Energizing/deenergizing delay

3 sec., factory set

9

Technical Data – continued
Indicators and adjustors

4 red LEDs for signalling “electrode submerged”, “output relay energized”
1 four-pole DIP switch for changing sensitivity

Cable entry

Cable gland with integral cable clamp
2x PG 9
1x PG 16

Protection

IP 65 to DIN 40050

Max. admissible ambient temperature

70°C (158 °F)

Weight

approx. 1.8 kg

Installation

NRGS 16-1, NRGS 16-1S

1. Determine required measuring lengths of electrode rods and enter data in table 1

Fig. 3, Fig. 4

2. Cut electrode rods 1 , 2 , 3 and 4 accordingly.

3. Deburr faces of electrode tips.

4. Strip off 50 mm of PTFE insulation from the ends of electrode tips.

NRGS 16-1

5. Check seating surfaces of threads or flange provided on vessel or boiler standpipe.

Fig. 5

CC

C

6. Place joint ring onto seating surface of electrode Fig. 3. Use only joint ring

CC

BB

B

BB

(of stainless steel 1.4301) D 33 x 39 to DIN 7603 supplied with electrode.

7. Apply a light smear of silicone grease (e. g. DO W Corning 111 Compound)

AA

A

to electrode thread .

AA

8. Screw level electrode into threads or flange provided on vessel or boiler standpipe
and tighten with a 41 mm open-end spanner. The torque required is 140 Nm when
cold.

NRGS 16-1S

9. Check seating surfaces and place flat gasket on connection standpipe.

DD

D

0. Place blind flange with bore together with level electrode onto connection

1

DD

standpipe and fix with bolts. Tighten bolts in diagonally opposite pairs. Fig. 4

10

Installation – continued

Table 1

Function

e.g. First low-level alarm
e.g. Feed pump ON
e.g. Feed pump OFF

e.g. High level alarm

Attention

■

The seating surfaces of the threads or flange provided on the vessel or
boiler standpipe must be accurately machined. Fig. 5

■

Do not bend electrode rod when mounting.

■

Do not lag electrode body.

Note

■

For the approval of the boiler standpipe with connecting flange the
relevant local and national regulations must be considered.

■

See four examples of installation on page 17.

Tools

■

Open-end spanner 41 mm A.F.

■

Bolt cutter

■

Hacksaw

■

Flat file, medium cut

Function

Electrode rod

1
2
3
4

Length [mm]

11

Wiring

NRGS 16-1, NRGS 16-1 S

Use multi-core flexible cable with min. conductor size 1.5 mm² for wiring.

GG

G

EE

E

1. Unscrew screws , remove housing cover Fig. 6

2. Unscrew union nuts of cable entry .

EE

FF

F

FF

The electrode terminal can be turned through +/– 180°.

QQ

Q

3. Loosen screw with 17 mm spanner but do not remove. Fig. 7

QQ

4. Turn electrode terminal into desired direction (+/– 180°).

QQ

Q

5. Tighten screw slightly.

6. Remove terminal strip from board.

QQ

MM

M

MM

7. Connect terminal strip according to wiring diagram, connect PE connection .

8. Insert terminal strip.

GG

G

9. Replace housing cover , fasten screws and install cable entry.

GG

Wiring diagram

GG

NN

N

NN

EE

E

EE

Mains

Fig. 8

Attention

■

Fuse supply cables with T 250 mA.

■

The connection of the switchpoints 2 and 3 must be effected on
site (pump contactor, auxiliary relay)!

Tools

■

Screwdriver for cross head (“Phillips”) screws, size 1

■

Screwdriver for slotted screws, size 2.5; completely insulated according to VDE 0680

■

Open-end spanner 17 mm A.F.

12

Standard setting

Factory setting NRGS 16-1

The compact system is delivered with the following factory settings:

■

Measuring range ≥ 10µS/cm

Switch selection of measuring range

≥ 0.5

µ

The measuring range can be switch selected between

LL

L

by means of DIP switch :

1. Unscrew screws at the electrode terminal, remove cover , Fig. 6

LL

EE

E

EE

S/cm and ≥ 10 µS/cm

GG

G

GG

DIP switch 1–4 OFF Measuring range ≥ 0.5

DIP switch 1–4 ON Measuring range ≥ 10

GG

G

2. Replace cover and fasten screws

GG

EE

E

EE

µ

µ

S/cm

S/cm

Attention

■

Do not damage the electronic components when operating DIP switch.

Tools

■

Screwdriver for cross head (“Phillips”) screws, size 1

■

Screwdriver for slotted screws, size 2.5; completely insulated according to VDE 0680

13

Commissioning

Warning

The terminal strip of the NRGS 16-1/NRGS 16-1S is live during operation.
This presents the danger of electric shock.
Cut off power supply before removing or replacing housing cover.

Wiring check

1. Check whether the system NRGS 16-1, NRGS 16 -1S has been wired according
to wiring diagram Fig. 8.

2. Check whether mains supply corresponds to the wiring carried out on the
equipment.

Check correlation of switching functions

1. Check whether the designated switchpoints – i.e. switch functions – have been
correlated with the individual electrode rods. See table 1.

Application of mains voltage

1. Switch on mains supply and check the correct functioning of the equipment at the

II

JJ

I

J

II

JJ

HH

H

corresponding switchpoints. LEDs , , and are provided for visual check

HH

KK

K

KK

of switchpoints. Fig. 7

GG

G

Remove housing cover to check LEDs , , and . See “Wiring”

GG

HH

II

H

I

HH

II

KK

K

KK

JJ

J

JJ

14

Annex

Warning

The terminal strip of the NRGS 16-1/NRGS 16-1S is live during operation.
This presents the danger of electric shock.
Cut off power supply before removing or replacing housing cover.

Fault finding list
Level has exceeded switchpoint “High water” – no function

Fault: Mains voltage has not been applied.
Remedy: Apply mains voltage. Wire equipment according to the wiring diagram.

Fault: The thermal fuse has failed.
Remedy: In case of defective thermal fuse the mains voltage has not been

connected to terminal : Replace defective thermal fuse
(Order No. 051629).
The ambient temperature must not exceed 70 °C.

Fault: The electric conductivity is too low.
Remedy: Switch DIP switch to ≥ 0.5 µS/cm.

Fault: The electrode housing does not have earth connection to the boiler.
Remedy: Clean seating surfaces and insert metal joint r ing (of stainless steel 1.4301)

33x 39 to DIN 7603.
Do not insulate compact system with hemp or PTFE tape!

Fault: Electronic board is defective.
Remedy: Replace board (Order No. 391321).

NN

N

NN

LL

L

LL

Level has fallen below switchpoint “Low water” – no function

Fault: The electrode rods have earth contact.
Remedy: Change installation position.

Fault: The vent hole in the protection tube does not exist, is obstructed or flooded.
Remedy: Check protection tube and, if necessary, provide vent hole.

Fault: The isolating valves of the external measuring pot (optional) are closed.
Remedy: Open isolating valves.

Switchpoint has been reached – incorrect function

Fault: The switching function has not been correctly allocated. Electrode rods

have been cut to the wrong size.

Remedy: Identify electrode supply wire and reconnect accordingly.

15

Annex – continued

Declaration of conformity

We hereby declare that the equipment NRGS 16-1 and NRGS 16-1 S conform to
the following Euopean guidelines:

■

LV guideline 73/23/EWG version 93/68/EWG

■

EMC guideline 89/336/EWG version 93/68/EWG

which are based on the following harmonised standards:

■

LV standard EN 60947-5-1: 1991

■

EMC standard EN 50 081-2, EN 50 082-2

This declaration is no longer valid if modifications are made to the equipment without
consultation with us.

Bremen, 28th April 1997

GESTRA GmbH

Dr. Anno Krautwald

Dr. Christian Politt

Legend

11

1

11

Flange PN 40, DN 50 (2"), DIN 2527
Flange PN 40, DN 100 (4"), DIN 2527

22

2

22

For the approval of the boiler standpipe with connecting flange the relevant
regulations must be considered.

33

3

33

Vent hole

44

4

44

High water (HW)

55

5

55

Electrode rod d = 5 mm

66

6

66

Protection tube DN 80

77

7

77

Protection tube DN 100

88

8

88

Electrode distance

99

9

99

Electrode distance

11

00

1

0

11

00

Low water (LW)

11

11

1

1

11

11

Reducer K- 88.9 x 3.2- 42.4 x 2.6 W to DIN 2616, par t 2

≥ 14 mm
≥ 40 mm

11

22

1

2

11

22

Reducer K-114.3 x 3.6- 48.3 x 2.9 W to DIN 2616, part 2

16

Examples of installation

44

4

44

88

8

88

≤ 90°

∅20

1"BSP

DN 50

≥10

11

1

11
22

2

22

∅ 20

33

3

33

20

55

5

55
66

6

66

11

00

1

0

11

00

11

11

1

1

11

11

Fig. 9 Fig. 10

¾"BSP

1"BSP

11

1

11

DN 20

22

2

22

≤ 1500

≤ 90°

∅20

1"BSP

DN 50

44

4

44

88

8

88

≥ 10

1"BSP

11

1

11
22

2

22

20
∅

33

3

33

20

55

5

55
66

6

66

11

00

1

0

11

00

11

11

1

1

11

11

11

11

1

1

11

11

11

1

11
22

2

22

≤ 20

44

4

44

9
3

99

99
33

33

20

Fig. 11

∅20

≤ 90°

∅20

DN 100

24.5 24.5

44

4

44

≤ 3000

ME

55

5

55
77

7

77
88

8

88

11

00

1

0

11

00

DN 20

11

22

1

2

11

22

≤ 20

Fig. 12

DN 20

55

5

55

11

00

1

0

11

00

17

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®

®

GESTRA GmbH

Postfach 10 54 60

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A Unit of Flowserve Corporation

A Siebe Group Company

810211-00/1297c · ©1997 GESTRA GmbH · Bremen · Printed in Germany

18