Kobold NBA-2 Manuale utente

Operating Instructions

for

Bypass Level Switch

Model: NBA-2/NBE-2

NBA-2/NBE-2

page 2 NBA-2/NBE-2 K05/1022

1. Contents

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

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

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

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

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

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

7.Electrical Connection .................................................................................... 5

8.Operation ...................................................................................................... 6

9.Hysteresis ..................................................................................................... 6

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

11.Technical Information .................................................................................... 7

12.Order Codes ................................................................................................. 8

13.Dimensions ................................................................................................... 8

14.Disposal ...................................................................................................... 10

15.EU Declaration of Conformance ................................................................. 11

16.UK Declaration of Conformity ...................................................................... 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

NBA-2/NBE-2

NBA-2/NBE-2 K05/1022 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.

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:

 Bypass Level Switch model: NBA-2/NBE-2

NBA-2/NBE-2

page 4 NBA-2/NBE-2 K05/1022

4. Regulation Use

Any use of the Bypass Level Switch, model: NBA-2/NBE-2, 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

The instrument comprises a metal housing with internally mounted magnetic level

switch and operates on the principle of communicating tubes.

As soon as the housing of the bypass level switch is filled about half way with

liquid, the float moves to the top and operates with the internal ring magnet a

changeover contact fitted in the measuring tube. Solenoid valves, signal lamps or

pumps are switched by the changeover contact by means of suitable electrical

auxiliaries (relay, contactor relay).

The following may have a negative impact on assured functioning:

 Considerable accumulation of dirt

 Large solid parts

 Crystallization

 Ferrite particles

NBA-2/NBE-2

NBA-2/NBE-2 K05/1022 page 5

6. Mechanical Connection

Use the process connection and suitable sealants to respectively bolt and seal

the NBA or NBE instrument to the tank to be monitored. The two process

connections are, as a rule, adequate for mechanically fastening the instrument.

Should there, however, be continuous shocks or pronounced vibrations, then it is

recommended additionally using rubber-absorbent pipe clamps to mechanically

fasten the bypass level switch. But no welding at all is to be done at the bypass

pipe.

7. Electrical Connection

Notice is to be taken of the safe electrical limiting data of the level

switch.

Connect the float switch fitted in the NBA/NBE instrument according to the

connection diagram below and link up to the electrical control system.

At all events it must be ensured when actuating loads such as contactors, relays

etc. that the electrical limiting values are not exceeded – and not even briefly due,

for instance, to voltage peaks. A contact protection relay is recommended to stop

any contact overloading.

14 1

NBA-2/NBE-2

page 6 NBA-2/NBE-2 K05/1022

8. Operation

Fill tank and switch on the electrical control system, if present. Given stop valves

between bypass process connection and tank, then slowly open the upper valve

(air balance) before the lower valve (liquid-side). Any venting and drain valves are

to be closed before filling starts. The liquid now entering the bypass pipe raises

the float until the level between tank and bypass pipe is evened out. The fact of

the liquid level in the tank already being above the operating point results in the

applied operating signal either being relayed or disconnected - depending on the

electrical connection wiring.

9. Hysteresis

Hysteresis refers to the difference between the cut-in and tripping points of the

contact. Adaptation undertaken at the factory of float magnet and contact strength

has produced a 7 mm float lift hysteresis.

10. Maintenance

Only when the liquid to be monitored has particles of dirt which might settle in the

bypass tank is the drain plug now and again to be undone to flush out any

deposits.

If incrustations or crystallization are present, then the tank must be emptied or

sealed off. This is to be followed by slowly removing the tank lid plus slider tube

and float from the bypass tank. The bypass tank can now be mechanically

cleaned.

NBA-2/NBE-2

NBA-2/NBE-2 K05/1022 page 7

11. Technical Information

Case material: aluminium (NBA)

stainless steel (NBE)

Seal: lid: NBR (NBA), PTFE (NBE)

drain screw: PTFE

Connections: G 3/8 female (NBA)

R ½ male (NBE)

Electrical connection box: aluminium 50x45x30 mm (NBA)

plastic Ø 80 mm (NBE)

Cable gland: M16x1,5

clamp range 5-9 mm

Measuring tube material: stainless steel 1.4571

Float material: stainless steel 1.4571

Medium temperature: -40...+90 °C (NBA)

-40...+150 °C (NBE)

Ambient temperature: -25...+80 °C

Max. pressure: 10 bar

Density of liquid: min. 0.65 kg/dm3

Contact components: 1 changeover contact

Contact material: Rhodium

Switching capacity: max. 60 VA

Switching voltage: max. 250 VAC

Inrush peak: max. 1 A

Hysteresis: approx. 7 mm

NBA-2/NBE-2

page 8 NBA-2/NBE-2 K05/1022

12. Order Codes

Case material Order number

aluminium NBA-200 R 10

stainless steel NBE-200 K 15

13. Dimensions

NBA-2

NBA-2/NBE-2

NBA-2/NBE-2 K05/1022 page 9

NBE-2

NBA-2/NBE-2

page 10 NBA-2/NBE-2 K05/1022

14. Disposal

Note!

 Avoid environmental damage caused by media-contaminated parts

 Dispose of the device and packaging in an environmentally friendly

manner

 Comply with applicable national and international disposal regulations and

environmental regulations.

Batteries

Batteries containing pollutants are marked with a sign consisting of a crossed-out

garbage can and the chemical symbol (Cd, Hg, Li or Pb) of the heavy metal that

is decisive for the classification as containing pollutants:

Cd1 Hg2 Pb3 Li4

1. „Cd" stands for cadmium

2. „Hg" stands for mercury

3. „Pb" stands for lead

4. „Li" stands for lithium

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