Kobold LNZ User manual

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.: [phone]
Fax: [phone]
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
y
Sensor Output
clamp 3
Switching
function clamp 1 clamp 2
GND + VS immersed approx. VSN/O contact
dr
y
approx. 0 V N/O contact
+ VS GND immersed approx. 0 V N/C contact
dr
y
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
y
Sensor Output
plu
g
PIN 4
Switching
function plu
g
PIN 1 plu
g
PIN 3
GND + VS immersed approx. VSN/O contact
dr
y
approx. 0 V N/O contact
+ VS GND Immersed approx. 0 V N/C contact
dr
y
approx. VSN/C contact
The output function (N/O / N/C function) is switched through by the polarity of
the power supply.
1
2
3
nc
1
2
3
4

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.

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page 10 LNZ K04/0422
10. Dimensions
Single-Rod Probe

LNZ
LNZ K04/0422 page 11
11. EU Declaration of Conformance
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Capacitive Level Switch Model: LNZ
to which this declaration relates is in conformity with the standards noted below:
EN 61326-1:2013
Electrical equipment for measurement, control and laboratory use - EMC
requirements - Part 1: General requirements
EN IEC 63000:2018 Technical documentation for the assessment of electrical
and electronic products with respect to the restriction of hazardous substances
Also, the following EEC guidelines are fulfilled:
2014/30/EU Electromagnetic compatibility
2011/65/EU RoHS (category 9)
2015/863/EU Delegated Directive (RoHS III)
We confirm that the material PEEK is approved by FDA without any limitations
for direct contact with food and pharma products and fulfils the corresponding
EU-regulation.
FDA Approval-No. 21 CFR 177.2415
EU Regulation 1935/2004
Hofheim, 13 April 2022
H. Volz M. Wenzel
General Manager Proxy Holder