Kobold NBK-R series, NBK-RM series, NBK-RT series, NBK-RA series, NBK-RT200 Operating Instructions Manual

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Operating Instructions

for

Limit switch

Model: NBK-R

NBK-RM NBK-RT NBK-RA

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1.Contents

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

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

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

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

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

5. Operating Principle ........................................................................................ 4

6. Mechanical Connection ................................................................................. 5

7. Electrical Connection .................................................................................... 6

8. Commissioning .............................................................................................. 7

9. Technical Information .................................................................................... 8

10.Order Codes ................................................................................................. 9

11.Illustrations .................................................................................................... 9

12.EU Declaration of Conformance .................................................................. 10

13.Type Examination Certificate ...................................................................... 11

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: info.de@kobold.com

Internet: www.kobold.com

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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 EC-machine guidelines.

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 Switches Model: NBK-R, NBK-RM, NBK-RT or NBK-RA  Operating Instructions

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.

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4.1 Electrical limit switch

- For standard applications NBK-R/NBK-RM: Bistable changeover contact fitted in

a polycarbonate housing with 3m connection cable

- For high temperature applications NBK-RT200/-RT400: Bistable changeover

contact fitted in an aluminium die cast housing with terminal connectors.

- 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

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 bypasstube 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.

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6.Mechanical Connection

NBK-R/NBK-RM

Mount and tighten the reed switch (NBK-R, NBK-RM and 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 (stainless steel) must be removed.

NBK-RA

NBK-RT200/400

The high temperature switch RT200/400 will be mounted to the bypass tube with the tube clip fixed at the contact housing.

ermal screening

(for 400°C-switch only)

Clamp

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ATEX

- contact

brown

blue

black

blue

ack

brown

Wit

h cable connection

Connect ion box

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-R

NBK-RM

Standard-

contact

NBK-RT

High

temperature

contact

NBK-RA

ATEX-contact

Switching capacity:

60 W/VA 80 VA 45 W/VA

Switching current:

1 A 1 A 0,6 A

Switching voltage:

230 V

AC/DC

250 V

AC/DC

230 V

AC/DC

Install the switch (if available) according to the diagram and connect it to the electrical controller.

When switching inductive loads, such as contactors, relays, etc., electrical limit values should not be exceeded, also temporarily by e.g. voltage peaks. The use of a contact protection relay is recommended to avoid overloading the reed contacts. Valid regulations for hazardous areas, and regulations for installation (DIN/VDE 0165), should be observed when installing the NBK level indicator in zone 1 or 2 of hazardous areas (no combustible liquids).

Note to NBK-RT200:

The contact must be connected by an adequate

switch amplifier (e. g. REL-6005/-6010) to allow for an ATEX-conform connection of the contact NBKRT-200 (see connecting example).

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

NBK-R NBK-RM

NBK-RT

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Connecting example NBK-RT200 with a switch amplifier REL

clamp 1 or 3

clamp 2

NBK-RT200

Power supply unit acc. IEC 60947-5-6 (e. g . REL-600x)

8. Commissioning

Commissioning of the electrical reed switch

Function of switches

All switches have three connection poles (black (2), blue (3) and brown (1)). The black wire (2) 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 (2) / blue (1) black (2) / brown (3)

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.

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9. T echnical Information

Limit contacts, model NBK-R/NBK-RM

Contact operation: bistable changeover contact Switching hysteresis: approximately 15 mm Max. switching capacity: 60 W/VA; 230 V

AC/DC

; 1 A Contact resistance: 100 m Medium temperature: max. 100 °C Ambient temperature: max. 75 °C Connection: 3 m PVC cable Housing: polycarbonate Protection: IP 67

Limit contacts, model, NBK-RT200/-RT400

Contact operation: bistable changeover contact Switching hysteresis: approximately 15 mm Max. switching capacity: 80 VA; 250 V; 1 A Contact resistance: <20 m Medium temperature: max. 200 °C (-RT200) / 400 °C (-RT 400) Ambient temperature: 145 °C (RT200) / 350 °C (-RT400) Connection: terminal connectors, screwed cable gland Housing: aluminium die cast housing, terminal connectors Protection: IP 65

ATEX limit switch, model NBK-RA

Contact operation: bistable changeover contact encapsulated Switching hysteresis: approximately 15 mm Max. switching capacity: 45 VA, 230 V

AC/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

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10. Order Codes

NBK-R NBK-RM

Standard limit contact (bistable changeover contact)

NBK-RT200

High temperature limit contact, t

max

200 °C, in conjunction with an external, intrinsically safe switch amplifier as Simple Operator

NBK-RT400

High temperature limit contact, t

400 °C

NBK-RA

ATEX-limit contact, encapsulated, II 2G Ex mb IIC T6/T5 Gb II 2D Ex mb IIIC IP67 T 105 °C Db

11. Illustrations

NBK-R/NBK-RM NBK-RT NBK-RA

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12. EU Declaration of Conformance

We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole responsibility that the product:

Limit Contact model: NBK-R / NBK-RM / NBK-RT to which this declaration relates is in conformity with the standards noted below:

DIN EN 61010-1: 2010

Safety requirements for electrical measuring, control and laboratory instruments

EN 60529:2014

Protection type through case (IP code) Also the following EEC guidelines are fulfilled:

2014/35/EU Low Voltage Directive 2011/65/EU RoHS

Furthermore we declare that the product

model: NBK-RA (ELOBAU 610*)

to which this declaration relates is in conformity with the standards noted below:

EN 60079-0:2012 General Requirements EN 60079-11:2012 Intrinsic Safety ‘i’ EN 60079-18:2009 Equipment protection by encapsulation ‘m’ EN 60079-26:2007 Equipment with equipment protection level (EPL) Ga

EC type examination test BVS 03 ATEX E 126 X

also the following EEC guidelines are fulfilled: 2014/34/EU ATEX

Hofheim, 28. June 2017 H. Peters M. Wenzel General Manager Proxy Holder

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