Kobold NGS Operating Instructions Manual

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.: [phone]

Fax: [phone]

E-Mail: [e-mail]

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. I

N

in accordance with IEC 60127)

• For T

amb

>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

2

NC

NO

Underwater version

Ex units

Normal units

blue

black

black

br own

gr . - yel l ow