Kobold LNK Manuale utente

Operating Instruction

for

Conductive Level Switch

Model: LNK

LNK

Page 2 LNK K06/0422

1. Contents

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

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

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

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

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

5.1.Head transmitter LNR (Option LNK-...NPK, LNK-...NPS) .................... 4

5.2.External electrode relay (e.g. NE-104, 304) ......................................... 4

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

6.1.Welding details for sleeves LZE ........................................................... 6

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

7.1.Connection without evaluating electronic (head transmitter) Model

LNK-...00K, LNK-...00S ........................................................................ 7

7.2.Connection with evaluating electronic (head transmitter) Model LNK-

...NPK, LNK-...NPS .............................................................................. 8

7.3.Plug assignment of M12-plug without evaluating electronics (head

transmitter) Model LNK-...00S ............................................................ 9

7.4.Plug assignment of M12-plug with evaluating electronics (head

transmitter) Model LNK-...NPS .......................................................... 10

8.Technical Information .................................................................................. 11

9.Order Codes ............................................................................................... 12

10.Maintenance ............................................................................................... 13

11.Dimensions ................................................................................................. 14

12.EU 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

LNK

LNK K06/0422 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:

 Conductive Level Switch model: LNK

4. Regulation Use

Any use of the Conductive Level Switch, model: LNK, 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.

LNK

Page 4 LNK K06/0422

5. Operating Principle

The conductive KOBOLD level probes LNK together with the transducer for head

mounting or the external evaluating electronic are used for level detecting. This

method is based on the evaluation of the electrical conductivity of the medium. In

combination with the KOBOLD LZE or LZE-R weld-in sleeves, the probe provides

a measuring point that has no dead space and meets hygiene standards

(EHEDG approval certificate). This level switch is therefore ideally suited for

CIP/SIP cleaning.

The level switch is available with 1 or 2 - 4 electrodes. As an option, they can be

delivered with an E-CTFE coating. This allows foaming media to be detected

reliably.

The output signal from the probes with head mounted transmitter can be

connected directly to a PLC for evaluation. This means lower installation costs,

minimum wiring requirements and a high degree of noise immunity.

The device is available with an optional M12x1 plug connector.

5.1. Head transmitter LNR (Option LNK-...NPK, LNK-...NPS)

A usage of the head transmitter LNR is only possible, when the LNK as a 2-

stem probe, contains an earth stem and a monitoring stem.

The transmitter integrated in the electrode head provides a control voltage

between the detecting electrode and the earth electrode. When the electrodes dip

into a conductive liquid, a small alternating current starts flowing. An integrated

switching amplifier detects this alternating current and switches the

24 VDC active output accurately, as soon as an adjusted trigger threshold is

crossed. When the liquid drops below the limit value electrodes, the output

becomes inactive again.

5.2. External electrode relay (e.g. NE-104, 304)

When the LNK is used as a 3-stem or 4-stem probe (2 or 3 switching points), the

evaluation takes place with an external electrode relay (see instruction manual

and technical details of the external electrode relay).

In order to get an additional switching point, the electrically conductive and

grounded vessel wall can be used as ground terminal. Therefore the ground

electrode can be used as an additional switching electrode.

LNK

LNK K06/0422 Page 5

6. Mechanical Connection

 Please note the maximum torque while mounting the instrument: 10 – 20 Nm

(measuring instrument connection G ½) and 25 – 30 Nm (measuring

instrument connection G 1).

 The electrodes must be mounted in a vertical position in the lid or the ground

of the vessel which must be detected.

 The mounting must be done in a way that there is no short circuit of the

electrodes neither to the walls of the vessel nor to itself.

 Note during mounting that the electrodes do not bend and the medium can

drain off easily when they are not longer touched by the fluid.

 The ground electrode must be at least as long as the longest switching

electrode.

 If not using the weld-in sleeves type LZE one must note there is a conducting

connection to the wall of the vessel. An additional grounding to the pipework or

the wall of the vessel is necessary when using an isolating sealing.

Shortening the electrodes:

 The tip of the electrodes is equal to the switching point and can be shortened if

necessary.

 Note, that the bracing of the electrode in the thread-piece is not too heavily

loaded during shortening.

 Do not harm the isolation of the electrode.

 After shortening, make sure that the E-CTFE isolation is removed of about a

length of 5 mm from the tip of the electrode.

LNK

Page 6 LNK K06/0422

6.1. Welding details for sleeves LZE

Welding in tanks and pipes:

1. Drill a hole with a diameter equivalent to outer diameter of the sleeve; max.

tolerance +0,2 mm

2. Weld the sleeve at 4 points

3. Screw in the blind socket

4. Weld the sleeve segments crosswise between already welded 4 points.

4 sleeve segments for M12 and G 1/2”; 8 sleeve parts for G1”

Attention! In order to avoid deforming or red-hot turning of the

sleeve, pauses between individual sleeve segments should be

sufficient enough to allow cooling down of the sleeve.

LNK

LNK K06/0422 Page 7

7. Electrical Connection

Attention! Make sure that the voltage values of your system accord

to the voltage values of the monitoring unit.

 Make sure that the supply wires are de-energised.

 Connect the supply wires and the output signal to the shown pins.

 We recommend the use of wires with cross sectional area of min. 0,25 mm²

Attention! A wrong connection of the plug pins can damage the

unit’s electronic!

7.1. Connection without evaluating electronic (head transmitter)

Model LNK-...00K, LNK-...00S

Reference: wall of vessel

(only possible with an electrical

conductive connection to the metal tank)

1 Electrode 1

2 Electrode 2

3 Electrode 3

4 Electrode 4

5 earthing of housing (Reference)

Reference: longest electrode

1 Reference electrode

2 Electrode 2

3 Electrode 3

4 Electrode 4

5 earthing of housing

E1 M

12345

E2 E3 E4

LNK

Page 8 LNK K06/0422

7.2. Connection with evaluating electronic (head transmitter)

Model LNK-...NPK, LNK-...NPS

1. Electrode unit: Switching point equal to the electrode length, earthing through

vessel wall

2. Electrode unit: 1 electrode as switching point

1 Power supply: +Vs / GND*

2 Power supply: GND / +Vs*

3 Output: Transistor PNP

(Uoff = +Vs - 1 V)

4 Sensitivity: +Vs / GND / open

5 Electrode 1: Ground electrode or

wall of vessel

6 Electrode 2: Detecting sensor

electrode

* see chapter 7.2.1

7.2.1. Setting the full /empty signal function:

The output function (full / empty signal) is switchable by changing the polarity of

the supply voltage.

Power suppl

Probe Output

Terminal 3

LED

Terminal 1 Terminal 2

GND + Vs immersed Uout on

0 V off

+ Vs GND immersed 0 V on

Uout off

external

link

LNK

LNK K06/0422 Page 9

7.2.2. Setting the sensitivity:

1. Configurate the instrument according to sensitivity step 1

2. Cover probe with the medium to be measured

3. If the Probe LED does not light up, try steps 2, 3 and 4 in succession, until the

probe LED is illuminated.

Step Sensitivity Connection 4 Jumper

position

1 0.1 k + Vs inside

2 1 k + Vs outside

3 10 k open outside

4 100 k GND outside

7.3. Plug assignment of M12-plug without evaluating

electronics (head transmitter)

Model LNK-...00S

Reference: wall of vessel

(only possible with an electrical conductive

connection to the metal tank)

1 Electrode 1

2 Electrode 2

3 Earthing of housing (Reference)

4 Electrode 3

5 Electrode 4

Reference: longest electrode

1 Reference electrode

2 Electrode 2

3 Earthing of housing

4 Electrode 3

5 Electrode 4

LNK

Page 10 LNK K06/0422

7.4. Plug assignment of M12-plug with

evaluating electronics (head transmitter)

Model LNK-...NPS

1 Power Supply + Vs / GND

2 Sensitivity + Vs / GND / open

3 Power Supply GND / +Vs

4 Output: Transistor PNP

7.4.1. Setting the output function at option M12-plug

The output function (full/empty signal) is switchable by changing the polaritiy of

the supply voltage.

Power Suppl

Sensor Output

Plug-PIN 4

LED

Plu

-PIN 1 Plu

-PIN 3

GND + Vs immersed Uout on

0 V off

+ Vs GND immersed 0 V on

Uout off

7.4.2. Setting the sensitivity at option M12-plug

1. Configurate the instrument according to sensitivity step 1

2. Cover probe with the medium to be measured

3. If the Probe LED does not light up, try positions 2, 3 and 4, until the probe LED

is illuminated.

Step Sensitivity Plug-Pin 2 Jumper

position

1 0.1 k + Vs inside

2 1 k + Vs outside

3 10 k open outside

4 100 k GND outside

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