Kobold NBK-RA Manuel utilisateur

Operating Instructions

for

Limit switch

Model: NBK-RA

NBK-RA

page 2 NBK-RA K01/0823

1. Contents

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

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

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

4.Regulation Use ............................................................................................. 4

4.1Electrical limit switch ............................................................................ 4

5.Operating Principle ........................................................................................ 5

6.Mechanical Connection ................................................................................. 6

7.Electrical Connection .................................................................................... 7

8.Commissioning.............................................................................................. 8

9.Technical Information .................................................................................... 9

10.Order Codes ............................................................................................... 10

11.Illustrations .................................................................................................. 11

12.Disposal ...................................................................................................... 12

13.EU Declaration of Conformance ................................................................. 13

14.Type Examination Certificate ...................................................................... 14

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

NBK-RA

NBK-RA K01/0823 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 instruction manuals on our website www.kobold.com are always for currently

manufactured version of our products. Due to technical changes, the instruction

manuals available online may not always correspond to the product version you

have purchased. If you need an instruction manual that corresponds to the

purchased product version, you can request it from us free of charge by email

([email protected]) in PDF format, specifying the relevant invoice number and

serial number. If you wish, the operating instructions can also be sent to you by

post in paper form against an applicable postage fee.

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.

3. Instrument Inspection

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:

 Electrical Limit Switch Model: NBK-RA

NBK-RA

page 4 NBK-RA K01/0823

4. Regulation Use

Any use of the device 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.

The Limit Switches for the NBK Bypass Level Indicators are used for continuos

measuring, display and monitoring of liquids in tanks or vessels. Depending on

the design the limit switches are suitable for applications with a higher operating

temperature or for the use in hazardous areas.

4.1 Electrical limit switch

For ATEX applications NBK-RA: Bistable changeover contact as an encapsulated

proximity switch fitted in metallic cast housing with 3 m connection cable.

ATEX-marking for contact NBK-RA (encapsulated version):

II 2G Ex mb IIC T6 / T5 Gb

II 2D Ex mb IIIC IP67 T 105 °C Db

 Use the contacts appropriate and as intended.

 Make sure that only accessories are used in hazardous areas that meet

all the requirements of the European directives and national legislation.

The contacts NBK-RA with ATEX approval meet the requirements of category

2 GD. The proximity switches with ATEX approval are used in the following

zones:

 2G in zone 1

 3G in zone 2

 2D in zone 21

 3D in zone 22

NBK-RA

NBK-RA K01/0823 page 5

5. Operating Principle

Kobold Bypass Limit Transmitter are used for the monitoring of limit values in

tanks or vessels. They are firmly attached with mounting plates and ribbon

clamps to the Bypass Level Indicator, model NBK, and can be moved to any

position on the bypass-tube within the measuring length. The reed-contacts in the

limit switches react bistable and they are switched by the magnetic float inside

the NBK tube as passing by. One or more limit switches can be mounted on the

bypass.

NBK-RA

page 6 NBK-RA K01/0823

6. Mechanical Connection

Mount and tighten the reed switch (NBK-RA) - if available - on the bypass tube

at the opposite side of the roller indicator with the provided ribbon clamps (ex

contact: two ribbon clamps). The height of the switch contacts may be selected at

will. The cable connection must point downwards. The switch must be attached

close to the bypass tube.

Due to technical adaptations, it may come to malfunctions, when installing new

contacts in an existing plant. If the contact does not switch during the float passes

by, the preassembled spacer (plastic) must be removed.

NBK-RA

NBK-RA K01/0823 page 7

- contact

brown

blue

black

7. Electrical Connection

Limit switch NBK-R, NBK-RM, NBK-RT, NBK-RA

Attention!

Observe the allowed electrical ratings for the limit switch.

Maximum values NBK-RA

ATEX-contact

Switching capacity: 45 W/VA

Switching current: 0,6 A

Switching voltage: 230 VAC/DC

Note to NBK-RA:

Protect the circuit of the limit contact with a fuse. This fuse

must tolerate the permitted nominal current of the

switching contact and must have a deactivating ability

according to the possible short circuit current of the power

system at the place of installation. The contact is activated

by the North Pole of a magnet and deactivated by its South

Pole.

NBK-RA

page 8 NBK-RA K01/0823

8. Commissioning

Commissioning of the electrical reed switch

Function of switches

All switches have three connection poles (black, blue and brown).

The black wire is the common pole for both switching functions (N/C and N/O

contact).

The float must pass the switch once in both directions so that the switching

function is in line with the terminal connection diagram and table below.

These instructions are often ignored when an alarm lamp is connected directly

with the result that the alarm lamp incorrectly indicates a fault.

When the switch has been passed, it is ready for operation and requires no

maintenance.

black / blue black / brown

float above open closed

float below closed open

Hysteresis

Hysteresis is the difference between contact closing

and opening points. A hysteresis of approximately

15 mm float travel is achieved by factory tuning of the

float magnet and contact strength.

NBK-RA

NBK-RA K01/0823 page 9

9. Technical Information

ATEX limit switch, model NBK-RA

Contact operation: bistable changeover contact

encapsulated

Switching hysteresis: approximately 15 mm

Max. switching capacity: 45 VA, 230 VAC/DC, 0,6 A

Temperature class: T6 / T5

Max. medium temperature: 70 °C / 85 °C

Connection: 3 m PVC cable

Housing: metallic, cast (GD-ZN Al 4 Cu1)

Protection: IP 67

ATEX-marking: II 2G Ex mb IIC T6/T5 Gb

II 2D Ex mb IIIC IP67 T 105 °C Db

NBK-RA

page 10 NBK-RA K01/0823

10. Order Codes

NBK-RA

ATEX-limit contact, encapsulated,

II 2G Ex mb IIC T6/T5 Gb

II 2D Ex mb IIIC IP67 T 105 °C Db

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