Kobold NBK-01 User manual

Operating Instructions

for

Bypass Level Indicator

with Threaded Connection

Model: NBK-01

NBK-01

page 2 NBK-01 K05/0322

1. Contents

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

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

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

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

4.1Bypass Measuring Tube System ......................................................... 4

4.2Electrical Limit Switches NBK-R .......................................................... 4

4.3Transmitter 00T ................................................................................... 4

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

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

7.Electrical Connection .................................................................................... 8

7.1Limit contacts NBK-R ........................................................................... 8

7.2Transducer: Magnetostrictive transducer with 4-wire transmitter ......... 9

8.Commissioning............................................................................................ 10

9.Trouble Shooting ......................................................................................... 11

10.Maintenance ............................................................................................... 11

11.Technical Information .................................................................................. 12

12.Order codes ................................................................................................ 13

13.Dimensions ................................................................................................. 14

14.EC Declaration of Conformance ................................................................. 15

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-01

NBK-01 K05/0322 page 3

2. Note

Please read these operating instructions before unpacking and setting 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-guidelines.

Classification according to Pressure Equipment Directive 2014/68/EU

NBK-01

Cate

assi

nment for dan

erous media

(

from dia

ram 1

)

Density

[kg/dm³]

[bar]

Category ML

[mm]

Category ML

[mm]

Category ML

[mm]

NBK-01

1,0

← Art.4, Para.

3← ≤317 ← Cat. I → 945 ← Cat. II → 4711

0,9/0,8/0,7/

0,6/0,54

≤207 835 4600

Cate

assi

nment for not dan

erous media

(

from dia

ram 2

)

Density

[kg/dm³]

[bar]

Category ML

[mm]

Kategorie ML

[mm]

Category ML

[mm]

NBK-01

1,0

← Art.4, Para.

3← ≤945 ← Cat. I

→5500 ← Cat. II → 24795

0,9/0,8/0,7/

0,6/0,54

≤835 5500 24685

ATTENTION! If the calculated bypass length is exactly within the range limit, then the stricter test

method must be used.

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 Indicator model: NBK-01…

NBK-01

page 4 NBK-01 K05/0322

4. Regulation Use

Any use of the Bypass level Indicator, model: NBK, 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 NBK Bypass Level Indicator is used for continuous measurement, indication,

and monitoring of liquids in tanks, vessels, reservoirs, basins etc. The indication

occurs via a magnetically coupled roller indicator.

4.1 Bypass Measuring Tube System

The bypass tube is attached at the side of the vessel with a connecting flange or a

threaded pipe. The installation position is always vertical. The NBK should only be

used for liquids with the medium density specified on the nameplate. Otherwise the

indication will deviate (float too high or submerged).

Vessel inner pressure and medium temperature should not exceed the specified

maximum values, as this can lead to the destruction and malfunction of the bypass

system. It is imperative that the materials used are compatible with the liquid being

measured.

Proper operation is also impaired by:

 high degree of soiling

 suspended solids

 crystallisation

 ferrite particles

4.2 Electrical Limit Switches NBK-R

The optional electrical limit switches serve to signal a preset level.

4.3 Transmitter 00T

A magnetostrictive transmitter can be mounted outside the bypass tube to

teletransmit the level. A continuous standard signal of 4-20 mA is output by means

of a fitted transmitter.

NBK-01

NBK-01 K05/0322 page 5

5. Operating Principle

Kobold Bypass Level Indicators are used for continuous measurement, display and

monitoring of liquid levels. The bypass tube is attached onto the side wall of the

vessel.

According to the law of communicating tubes the level in the bypass tube equals

the level in the vessel. A float with embedded circular magnets in the bypass tube

follows the liquid level and transfers it in a non-contacting manner to a display or a

monitoring device fitted outside the tube. The following indication and monitoring

devices are available:

Magnetic roller indicator

As the float passes by, the red/white rollers are rotated in succession by 180°

around their own axes. The rollers change from white to red as the level rises and

from red to white as the level falls. The advantage of ball displays is the higher

protection category, good visibility of 180 ° and higher vibration resistance with

filled version. The level in a tank or a mixer is continuously displayed as a red

column, even when the power supply fails.

Transmitter

A magnetostrictive transmitter can be mounted outside the bypass tube to

teletransmit the level. A continuous standard signal of 4-20 mA is output by means

of a fitted transmitter.

Limit contacts

One or more reed contacts for limit-value acquisition or also for level control can

be attached to the bypass tube.

NBK-01

page 6 NBK-01 K05/0322

6. Mechanical Connection

Remove the bottom flange from the

bypass tube, and insert the

cylindrical float in the NBK bypass

tube with the designation "TOP"

upturned. Reposition the gasket

and close the bottom flange again;

firmly tighten with screws.

Mount the bypass tube to the

vessel to be monitored via the

process connection and seal with

an appropriate device. Normally it

is sufficient to fix the complete NBK

with both process connections.

However the NBK should be

subjected to constant shock or

strong vibrations it is

recommended that the instrument

is secured with rubber-damped

tube clips. No welding is allowed on

the bypass tube.

Mount and tighten the magnetic

roller indicator - if not already

mounted - on the bypass tube with

the two provided ribbon clamps.

Mount and tighten the reed switch

- 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.

The switching function of the switch

is impaired by an enlarged air gap.

NBK-01

NBK-01 K05/0322 page 7

Magnetostrictive Transmitter

Mount and tighten the remote sensor - if

available and not already mounted - on the

bypass tube with the ribbon clamps. The

remote sensor must fully cover both process

connections. The cable terminal box is

situated at the top.

NBK-01

page 8 NBK-01 K05/0322

7. Electrical Connection

7.1 Limit contacts NBK-R

Attention!

Observe the allowed electrical ratings for the limit switch.

Maximum values

NBK-R

Standard contact

Switching capacity: 60 W/VA

Switchin

current: 1

Switching voltage: 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, also temporarily, be

exceeded by e.g. voltage peaks. The use of a contact

protection relay is recommended to avoid overloading the

reed contacts.

NBK-01

NBK-01 K05/0322 page 9

7.2 Transducer: Magnetostrictive transducer with 4-wire transmitter

 Ensure that the electrical supply lines are powerless.

 To avoid faults caused by electrical fields from other circuits, the cables should not

be installed adjacent to other high voltage power lines.

 Unscrew cover and run supply lines through cable gland.

 Connect the remote sensor to the electronics according to the following wiring

diagram.

NBK-01

page 10 NBK-01 K05/0322

8. Commissioning

Because of the setting behaviour of seals, all screw connections must be

retightened.

Fill vessel and switch on electrical controller, if available. If there are gate valves

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

(pressure equalisation) and then the lower valve (liquid side). If vent and drain

valves have been installed, close them before filling.

The liquid that now enters the bypass tube raises the float until the level between

tank and bypass tube is balanced. The roller indicator indicates the liquid level.

Commissioning electrical reed switches NBK-R

Function of switches

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

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

(

)

/ 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.

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