Kobold NBK-03 Manuel utilisateur

Operating Instructions

for

Bypass Level Indicator

Model: NBK-03/-06/-07/

-10/-31/-32/-33

NBK

page 2 NBK K06/0623

1. Contents

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

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

3.Instrument Inspection .................................................................................... 4

4.Regulation Use ............................................................................................. 5

4.1.Bypass Measuring Tube System ......................................................... 5

5.Electrical connection ..................................................................................... 6

6.Operating Principle ........................................................................................ 6

7.Mechanical Connection ................................................................................. 7

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

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

10.Maintenance ................................................................................................. 9

11.Technical Information .................................................................................. 10

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

13.Dimensions ................................................................................................. 10

14.Disposal ...................................................................................................... 11

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

NBK

NBK K06/0623 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.

Operating instructions, data sheet, approvals and further information via the QR

code on the device or via www.kobold.com

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-03 to NBK-33

Cate

assi

nment for dan

erous media

(

from dia

ram 1

)

Density

/dm³]

[bar]

Category ML

[mm]

Category ML

[mm]

Category ML

[mm]

Category ML

[mm]

Category ML

[mm]

NBK-03

1,0

← Art.4, Para. 3←

≤317

← Cat. I →

945

← Cat. II →

4711

← Cat. III →

24795 - / -

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

0,6/0,54 ≤207 835 4600 24685 - / -

NBK-06

1,0

192 1698 9732

← Cat. IV →

∞

0,9/0,8/0,7 82 1588 9622 ∞

NBK-07

1,0

------- 128 1060 6504 ∞

0,9/0,8/0,7 ------- 18 950 6394 ∞

NBK-10

1,0

100

------- 140 577 4084 ∞

0,9/0,8 ------- 30 467 3974 ∞

NBK-31

1,0

160

≤2090 5600

0,9 ≤2020 5600

0,8 ≤1900 5400

NBK-32

1,0

250

≤1180 5600

0,9 ≤1110 5600

0,8 ≤985 5400

NBK-33

1,0

320

≤1040 5600

0,9 ≤970 5500

0,8 ≤830 5400

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

NBK

page 4 NBK K06/0623

Classification according to Pressure Equipment Directive 2014/68/EU

NBK-03 to NBK-33

Cate

assi

nment for not dan

erous media

(

from dia

ram 2

)

Density

/dm³]

[bar]

Category ML

[mm]

Kategorie ML

[mm]

Category ML

[mm]

Category ML

[mm]

Category ML

[mm]

NBK-03

1,0

← Art.4, Para. 3←

≤945

← Cat. I →

4711

← Cat. II →

24795

← Cat. III →

75007 - / -

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

0,6/0,54 ≤835 4600 24685 74897 - / -

NBK-06

1,0

≤192 1698 9732 29816 - / -

0,9/0,8/0,7 ≤82 1588 9622 29706 - / -

NBK-07

1,0

≤128 1060 6504 20112

← Cat. IV →

∞

0,9/0,8/0,7 ≤18 950 6394 20002 ∞

NBK-10

1,0

100

≤140 577 4084 12849 ∞

0,9/0,8 ≤30 467 3974 12739 ∞

NBK-31

1,0

160

≤2090 5600 - / -

0,9

≤2020 5600 - / -

0,8

≤1900 5400 - / -

NBK-32

1,0

250

≤1180 4410 5600

0,9

≤1110 4340 5600

0,8

≤985 4220 5400

NBK-33

1,0

320

≤1040 4090 5600

0,9

≤970 4010 5500

0,8

≤830 3870 5400

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

NBK

NBK K06/0623 page 5

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

NBK

page 6 NBK K06/0623

5. Electrical connection

Optional electrical add-on parts (transmitter and limit contacts)

There is a separate operating manual for the assembly and commissioning of the

optional electrical add-on parts: MM, NMT/NBK-T, NBK-R

These operating instructions document the following electrical add-on parts:

Transmitter:

Reed contact resistor chain model W

Reed contact resistor chain with transmitter model M

Magnetostrictive sensor with transmitter model T

Reed contact resistor chain with transmitter model AE/AC

Reed contact resistor chain with transmitter HART model HE/HC

Reed contact resistor chain with transmitter FF model F

Limit Contacts:

Reed switch limit contact model NBK-R

Limit contact high temperature model NBK-RT200/RT400

Reed switch limit contact model NBK-RV200NO/RV200NC

Reed switch limit contact NAMUR model NBK-RV200NO/RV200NC

6. 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 fitted outside the tube or to a monitoring device. The following indication

and monitoring devices are available:

Magnetic roller indicator

As the float passes by, the red/white* rollers/balls 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.

* ceramic rollers in orange/beige

NBK

NBK K06/0623 page 7

7. Mechanical Connection

Remove bottom flange from bypass

tube, and insert the cylindrical float in

the NBK bypass tube with the

designation "TOP" at the top. Re-

position 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,

should the NBK 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.

NBK

page 8 NBK K06/0623

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 relief) 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.

For media with high operating temperatures, the surface of the level

indicator also heats up. The operator must take appropriate measures to

prevent accidental contact with such surfaces (protective cage). If this is

not structurally possible under certain conditions, appropriate protective

clothing must be worn in the area of the level indicator.

NBK

NBK K06/0623 page 9

9. Trouble Shooting

Error: The tank is full but there is no indication

 Check that both flanges (process connection), top and bottom, are open to the

vessel, and that the bypass tube fills with liquid.

 Check that there is a float in the system.

 When the float is installed, check whether it is being blocked by foreign objects

or dirt deposits.

Error: The tank is full but the indication is too low.

 Check that the density of the liquid is the same as the density given on the

nameplate.

 Check that the float has been correctly installed with the marking "TOP" at the

top.

 Check if dirt deposits in the bypass tube are blocking the float.

10. Maintenance

The drain plug should be opened occasionally, to wash out any deposits in case

the liquid to be measured contains dirt particles, which could settle in the bypass

tube.

If crust formation or crystallisation has taken place, the tank must be emptied or

shut off; the lower cover flange must then be removed. The float should then be

removed carefully out of the bypass. The bypass tube can now be mechanically

cleaned.

The inspection window for the roller indication is made of high-quality plexiglass

(glass for high-temperature display). It should be cleaned with a suitable cleaning

agent.

The indicator requires no further maintenance.

NBK

page 10 NBK K06/0623

11. Technical Information

Operating instructions, data sheet, approvals and further information via the QR

code on the device or via www.kobold.com

12. Order Codes

Operating instructions, data sheet, approvals and further information via the QR

code on the device or via www.kobold.com

13. Dimensions

Operating instructions, data sheet, approvals and further information via the QR

code on the device or via www.kobold.com

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