Kobold NGS Manuale utente

Operating Instructions

for

Dual-Magnet Float Switch

Model: NGS

NGS

page 2 NGS 01/06

1. Contents

1. Contents........................................................................................................2

2. Note ..............................................................................................................3

3. Instrument Inspection....................................................................................3

4. Regulation Use..............................................................................................3

5. Operating Principle........................................................................................3

6. ATEX-Marking...............................................................................................4

7. Indications for the Safe EX-use.....................................................................4

8. Mechanical Connection.................................................................................5

9. Electrical Connection ....................................................................................5

10. Maintenance .................................................................................................6

11. Technical Information....................................................................................6

12. Order Codes .................................................................................................7

13. Dimensions ...................................................................................................7

13.1. Accessories .......................................................................................10

14. Declaration of Conformance .......................................................................11

15. ATEX-Certificate .........................................................................................12

Manufactured and sold by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: +49(0)6192-2990

Fax: +49(0)6192-23398

E-Mail: [email protected]

Internet: www.kobold.com

NGS

NGS 01/06 page 3

2. Note

Please read these operating instructions before unpacking and putting the unit

into operation. Follow the instructions precisely as described herein.

The devices are only to be used, maintained and serviced by persons familiar

with these operating instructions and in accordance with local regulations

applying to Health & Safety and prevention of accidents.

When used in machines, the measuring unit should be used only when the

machines fulfil the EWG-machine guidelines.

3. Instrument Inspection

All Instruments are inspected before shipping and sent out in perfect condition.

Should damage to a device be visible, we recommend a thorough inspection of

the delivery packaging. In case of damage, please inform your parcel service /

forwarding agent immediately, since they are responsible for damages during

transit.

Scope of delivery:

The standard delivery includes:

•Dual-Magnet Float Switch model: NGS

•Operating Instructions

4. Regulation Use

Any use of the Dual-Magnet Float Switches, model: NGS, which exceeds the

manufacturer’s specification, may invalidate its warranty. Therefore any resulting

damage is not the responsibility of the manufacturer. The user assumes all risk

for such usage.

5. Operating Principle

As the level rises and falls, the inclination of the float is changed causing a

permanent magnet in the float to be deflected. This repels a rotatable opposing

magnet. This forced snap-action-contact effect operates a microswitch

with a plunger. Even very small changes in level can be switched in this way.

NGS

page 4 NGS 01/06

6. ATEX-Marking

The marking in ATEX for the Dual-Magnet Float Switch is as follows:

II 1/2 G EEx dme IIC T6...T2

7. Indications for the Safe EX-use

•Ambient and medium temperature

Temperature class Ambient temperature Max. mediums temperature

T6 -20 °C ... +60 °C +80 °C

T5 -20 °C ... +70 °C +95 °C

T4 -20 °C ... +80 °C +130 °C

T3 -20 °C ... +80 °C +200 °C

T2 -20 °C ... +80 °C +250 °C

•For installation of version NGS-4 _ _ _Ex (with integrated cable) a suitable

junctionbox shall be used.

•The NGS float switch shall be connected to the local EP circuit.

•The NGS float switch has to be provided in series with a circuit breaker as a

short-circuit protection (max. INin accordance with IEC 60127)

•For Tamb >60 °C, a suitable cable shall be used.

Electrical parameters

For connection to an electrical circuit with following maximum values:

UN = 250 V IN = 2,5 A AC12

UN = 220 V IN = 0,3 A DC13

Cable: Cable diameter depends on the mounted cable gland,

Max. 5x2,5mm² cross section

Electric safety: Class 1 according to EN 61010-1

Ingress protection:

NGS-_ _ _ _Ex: IP 65 according to EN 60529

NGS-4 _ _ _Ex: IP 68 according to EN 60529

NGS

NGS 01/06 page 5

8. Mechanical Connection

The float switch is to be installed in such a way that the float is able to move

entirely free without touching the walls, the vessels top, or base. Avoid installation

in turbulent positions: such as inlet valves and agitators.

Please also protect from suspended and ferrite particles that could gather around

the float and disturb the switching process. When installing float switches in

separate housings, suitable valves should be provided since dirty particles must

be drained out from time to time.

For purposes of installation and maintenance, the switch should be installed in an

easily accessible position.

The float switch must be installed with a connecting flange. A seal is enclosed

separately. (Gasket Klingersil C 4500).

For corrosive media, the customer should install an appropriate seal compatible

with the medium being used.

9. Electrical Connection

Attention! Make sure that the voltage values of your system

correspond with the voltage values of the measuring unit.

kábeltípus: NSSHöu-J 5x1,5mm

Underwater version

Ex units

Normal units

blue

black

br ow n

gr .- y el l ow

NGS

page 6 NGS 01/06

10. Maintenance

The measuring unit requires no regular maintenance. Sometimes cleaning of

adhered materials is necessary. Repairs should only be carried out by the

manufacturer.

11. Technical Information

NGS-_1, horizontal mounting

Nominal pressure: 25 bar

Installation position: from side

Differential: fixed, see diagram

NGS-_3, horizontal mounting

Nominal pressure: 16 bar

Installation position: from above

Differential: adjustable

General

Medium temperature: -20 °C to +250 °C*

Ambient temperature: -20 °C to +80 °C*

Min. medium density: > 0.7 kg/dm³

Wetted parts: stainless steel 1.4571

Switch housing: aluminium casting, colour coated

Flat gasket: Klingerit

Process connection: square flange, DIN Flange, 2“ BSP or NPT

Switching element: 1 microswitch with 2 switch contacts,

changeover function

Switch capacity: 250 VAC/10 A

220 VDC/0.6 A

for ex operation: 250 VAC/2.5 A

220 VDC/0.3 A

Electrical connection: M20x1.5

Protection: Standard version:

NGS-2...: IP 65

Submersible version:

NGS-4...: IP 68 (max. 20 m WC)

ATEX-approval: II 1/2 G EEx dme IIC T6...T2

Other approvals: GL-approval

Weight: approx. 2.5 kg

*Temperature designation ATEX-option

Class T6 T5 T4 T3 T2

Process temperature 80 °C 95 °C 130 °C 200 °C 250 °C

Ambient temperature -20...+60 °C -20...+70 °C -20...+80 °C -20...+80 °C -20...+80 °C

NGS

NGS 01/06 page 7

12. Order Codes

Example: NGS-2 1 0 0

Model Housing Installation type Process connection Arm length Approval

NGS-

2 = standard

4 = submersible

(with factory

mounted

cable**)

1 = fixed hysteresis

-standard (side

installation)

-L-arm (inst. from

above)

-Z-arm (side

installation)

0 = 92 mm square flange PN 25

B = BSP 2“

N = 2 NPT

1 = DN 80, PN 40, steel

2 = DN 100, PN 40, steel

5 = DN 80, PN 40, steel 1.4571

6 = DN 100, PN 40, steel 1.4571

0 = 0 mm

5 = 100 mm

6 = 200 mm

7 = 300 mm

8* =L or Z arm,

length

switch point and

installation

position

according to

customer

specification

without =

GL-approval

EX =

ATEX- and

GL- approval

2 = standard

3 = adjustable

hysteresis,

installation from

above

0 = 92 mm square flange PN 25

5 = 1000 mm

6 = 2000 mm

7 = 3000 mm

8* = L arm, length

depending on

customer

specification

*In case of L- or Z arm: please specify dimensions for the switch point (Lsh or Lsl) and the installation position (horizontal

or vertical) in writing

**Please specify cable length in writing

Accessory: counter flange

Model Material

NGS-MFF1 Counter flange, steel 1.7218

NGS-MFF2 Stainless steel, 1.4404

13. Dimensions

Fixed switch hysteresis, side installation

Switching data model NGS-21...

LK = linkage length 0 100 200 300

L = Installation length 202 321 421 521

Lma

= Total swing 118 180 234 286

X1 = upper switch point 7 27 45 81

X1 = lower switch point 16 30 47 43

Note: The data apply to water at 20 °C

NGS

page 8 NGS 01/06

Adjustable hysteresis, installation from above

~ 123

92 x 92

(

)

(

[

]

)

L=Protusion length

Lsh=high switch point

Lsl=low switch point

Process connection: BSP or NPT Square flange

∅

92/4x13,5

∅

NGS

NGS 01/06 page 9

L arm, installation from above

Z arm, side installation

Submersible Version

TOP

2,5MPa

0,2MPa

NGS

page 10 NGS 01/06

13.1. Accessories

Counter flange NGS-MFF_

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