Kobold LNZ Manuel utilisateur

Operating Instructions

for

Capacitive Level Switch

Model: LNZ

LNZ

page 2 LNZ K04/0422

1. Contents

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

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

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

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

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

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

6.1.Installation with hygienic installation system LZE ................................ 5

6.2.Installation in G1/2 thread .................................................................... 6

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

7.1.Model with screwed cable gland Terminal pin assignment of the

3-pole clamp ........................................................................................ 8

7.2.Model with round pin plug Connector assignment of the M12-plug ..... 8

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

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

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

11.EU Declaration of Conformance ................................................................. 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: [email protected]

Internet: www.kobold.com

LNZ

LNZ K04/0422 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:

 Capacitive Level Switch model: LNZ

4. Regulation Use

Any use of the Capacitive Level Switch, model: LNZ-N, 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.

LNZ

page 4 LNZ K04/0422

5. Operating Principle

The LNZ capacitive level switch is used for detecting levels of fill. The electric

field penetrates several millimetres into the medium. The change in capacity

caused by contact with the medium is measured and evaluated.

By using this principle of measurement, it is also possible to detect non-

conductive media. Installation in tanks is very straightforward regardless of

position.

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 and (EHEDG approval certificate). Installation is virtually front-flush.

This level switch is therefore very well suited for CIP/SIP cleaning. Adapter

sleeves are also available for different process connections so that the device

can also be used in existing systems.

Because the electronics are already integrated no other evaluating instrument is

necessary. The output signal (24 VDC) can therefore be transmitted directly to an

SPS for further processing.

LNZ

LNZ K04/0422 page 5

6. Mechanical Connection

Installation: Pipe or vessel

Installation position: independent, for switching, the sensor needs to be

completely wetted

6.1. Installation with hygienic installation system LZE

Welding and mounting details:

Welding in tanks and pipes:

1. Drill a hole with 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 between already welded 4 points.

4 sleeve segments for M12 and G ½“; 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.

LNZ

page 6 LNZ K04/0422

 Pay attention to the maximum allowable torque of 10 – 15 Nm when you

screw in the sensor (instrument connection G1/2).

 Please avoid frequent screwing in and unscrewing of the sensor from the

sleeve, because on high stress, the sealing edge can distort and the process

connection can get leaky.

The sealing system is designed for CIP- and SIP-cleaning.

6.2. Installation in G1/2 thread

If the sleeve LZE is not used for the installation of the level switch LNZ, it is

possible to seal the screw thread with an adequate sealing material. Thus, an

installation is possible in a pipe as well as in a vessel.

No conductive connection needs to be established to the vessel or to the pipe.

LNZ

LNZ K04/0422 page 7

7. Electrical Connection

Attention! Make sure that the voltage values of your system

correspond with the voltage values of the measuring unit.

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

 Connect the supply wires and the output signal to the shown pins as indicated

in section 7.1 / 7.2.

 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!

LNZ

page 8 LNZ K04/0422

7.1. Model with screwed cable gland

Terminal pin assignment of the 3-pole clamp

Power suppl

Sensor Output

clamp 3

Switching

function clamp 1 clamp 2

GND + VS immersed approx. VSN/O contact

approx. 0 V N/O contact

+ VS GND immersed approx. 0 V N/C contact

approx. VSN/C contact

The output function (N/O / N/C function) is switched through by the polarity of

the power supply.

7.2. Model with round pin plug

Connector assignment of the M12-plug

Power suppl

Sensor Output

plu

PIN 4

Switching

function plu

PIN 1 plu

PIN 3

GND + VS immersed approx. VSN/O contact

approx. 0 V N/O contact

+ VS GND Immersed approx. 0 V N/C contact

approx. VSN/C contact

The output function (N/O / N/C function) is switched through by the polarity of

the power supply.

LNZ

LNZ K04/0422 page 9

8. Technical Information

Measuring principle: capacitive

Process temperature: 0...100 °C

150 °C max. 30 min for

CIP process

Ambient temperature: 0...70 °C

Working pressure: max. 10 bar

Material

• Head, thread supports: stainless steel 1.4404

• Coupler section: PEEK, stainless steel 1.4404

Process connection: G ½, hygienic weld-in sleeve

LZE, LZE-R

Connection: threaded cable connection

M16 x 1.5

Terminal: 3-pole,

(optional plug M12 x1)

Function: Full / empty report (determined via

the polarity of the supply voltage)

Output: Open Collector, PNP,

max. 200 mA

Switch delay (fixed): approx. 0.2 s

Power supply: 24 VDC, ±20%,

< 10 mA without load

Protection: IP 67

Weight: approx. 0.5 kg

Dielectric constant of

the medium: R >20

9. Order Codes

Example: LNZ-12 G4 3PK

Model Material Process connection Electrical connection

LNZ- 12 = stainless steel G4 = G 1/2 3PK = M16x1.5 threaded cable connection

3PS = M12x1 plug

EHEDG-certification of the connection system

cable connection with weld-in sleeve LZE.

LNZ

page 10 LNZ K04/0422

10. Dimensions

Single-Rod Probe

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