KOBOLD LNM Microwave Level Switch Instruction Manual
- June 3, 2024
- KOBOLD
Table of Contents
LNM Microwave Level Switch
Instruction Manual
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 youhave 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
(info.de@kobold.com) 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.
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:
- Microwave Level Switch model: LNM
Regulation Use
Any use of the Microwave Level Switch, model: LNM, 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.
Operating Principle
The KOBOLD LNM Microwave Level Switch is used for detecting liquid levels. The
microwave field penetrates several millimetres into the medium. Condensate or
adherent remains of the medium are not detected.
By using this principle of measurement, it is also possible to detect non-
conductive media. The level switch is particularly suitable for use with
foaming media because the foam itself is not detected. The output of the level
monitoring device only switches when the coupling section is completely
covered by the medium.
This means it is possible to install it into tanks 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
(EHEDG- approval certificate). 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 installations.
Because the electronics are already integrated no other evaluating instrument
is necessary. The output signal can therefore be transmitted directly to a PLC
for further processing.
Mechanical Connection
Installation: Pipe or vessel
Installation position: independent, the sensor needs to be completely
wetted for switching
| Attention! Due to the measuring method the devices are unprotected
against electrostatic discharge on the measuring cone point. Do not touch the
devices at the cone point during installation. Secure a potential equalisation
between the device housing and the mounting
place before the final mounting! A trouble-free functioning of LNM- 12M3xxx is
guaranteed only by using the LZE-Installation System.
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6.1 Installation design “Foodstuffs” with hygienic installation system
LZE
Welding and mounting details:
Welding in tanks and pipes:
- Drill a hole with diameter equivalent to outer diameter of the sleeve; max. tolerance + 0,2 mm
- Weld the sleeve at 4 points
- Screw in the blind socket
- Weld the sleeve segments between already welded 4 points.
- sleeve segments for M12 and G ½“
| Attention! In order to avoid deforming or red-hot turning of the sleeve
during welding, pauses between individual sleeve segments should be sufficient
enough to allow cooling down of the sleeve.
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- Pay attention to the maximum allowable torque of 10 – 15 Nm when you screw in the sensor.
- Please avoid screwing in and unscrewing the sensor from the sleeve, because on high stress the sealing edge can distort and the process connection can get leaky.
The sealing system LZE is designed for CIP- and SIP-cleaning.
6.2 Installation design “Industry” in G 1/2 thread
If the sleeve LZE is not used for the installation of the level switch LNM, 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.
Electrical Connection
Attention! Make sure that the voltage values of your system correspond with the voltage values of the instrument.
- Make sure that the supply wires are powerless.
- Connect the power supply and the output signal according to the below PIN´s of the plug or the Terminal PIN plug.
- We recommend to use wires with cross sectional area of min. 0.25 mm²
Attention! Incorrect wiring will lead to damage of the unit’s electronics.
7.1 Model with screwed cable gland
Terminal pin assignment of the 3-pole clamp
Power supply| Sensor| Output clamp 3| Switching function|
Function LED
---|---|---|---|---
clamp 1| clamp 2
+ Vs| GND| immersed| approx. Vs| N/O contact| long ON + short OUT
dry| approx.0 V| N/O contact| short ON + long OUT
GND| + Vs| Immersed| approx.0 V| N/C contact| long ON + short OUT
dry| approx. Vs| N/C contact| short ON + long OUT
short = about 1 s.
long = about. 3 s.
The output function (N/C / N/O function) is switched by changing the polarity
of the power supply.
The PNP output must be loaded with a minimum load of ≤ 50kOhm so that the low
potential is reached when it is switched off.
7.2 Model with round pin plug
Connector assignment of the M12-plug
Power supply| Sensor| Output clamp 3| Switching function|
Function LED
---|---|---|---|---
plug PIN 1| plug PIN 3
+ Vs| GND| immersed| approx. Vs| N/O contact| long ON + short OUT
dry| approx.0 V| N/O contact| short ON + long OUT
GND| + Vs| Immersed| approx.0 V| N/C contact| long ON + short OUT
dry| approx. Vs| N/C contact| short ON + long OUT
short = about 1 s.
long = about. 3 s.
The output function (N/C / N/O function) is switched by changing the polarity
of the power supply.
The PNP output must be loaded with a minimum load of ≤ 50kOhm so that the
lowpotential is reached when it is switched off.
Technical Information
| Method of measurement: | microwave technology |
|---|---|
| Process temperature: | 0…100 °C |
150 °C max. 30 min for CIP-Process
Ambient temperature:| 0…70 °C
Operating pressure:| max. 10 bar
Materials:
• head, screwed gland:
• coupling piece:| stainless steel 1.4404
PEEK
Process connection:| G 1/2, hygienic weld-on sleeves LZE, LZE-R
Connection:| cable gland M16x1.5
Terminal:| 3-pole, (optional plug M12x1)
Function:| full/empty signal (set by polarity of supply voltage)
Output:| open collector, PNP, 50 mA
Switching delay (fixed):| 0.2 s (0.3 – 1.0 s on request)
Power supply:| 18…36 VDC, < 50 mA without load
Protection:| IP 67
Weight:| approximately 0.5 kg
Dielectric constant of the medium:| εR >20; Option: εR 2-20
Order Codes
Example: LNM-12 G4 3PK
Design| Material| Process connection| Sensitivity|
Model| Electrical connection
---|---|---|---|---|---
Foodstuffs*| Stainless steel/PEEK| G 1/2| eR: >20| LNM-12 G4 A…| 3PK =
M16x1.5 threaded cable connection
3PS = M12x1 plug
Industry| Stainless steel/PEEK| G 1/2| eR: >20| LNM-22 G4 A…
*Installation only possible with EHEDG sleeve
**Note: For this model, following connections adapters are available:
LZE-L1
LZE-A1
LZE-V1
LZE-C1
Accessories
In connection with the installation system LZE a hygienic installation is
guaranteed.
Example: Installation of the temperature sensor with the installation
system LZE.
Suitable sleeves for the Microwave Level Switch, model LNM
Mounting Sleeves, EHEDG certified
| Measuring unit connection G 1/2
---|---
cylinder sleeve| LZE-Z2
cylinder sleeve with test hole| LZE-T2
cylinder sleeve low form| LZE-N2
cylinder sleeve with collar| LZE-P2
collar sleeve| LZE-K2
ball sleeve| LZE-U2
adapter:|
conical connection DIN 11851| LZE-L2
aseptic lap-joint flange DIN 11864| LZE-A2
VARIVENT®| LZE-V2
Tri-Clamp®| LZE-C2
G 1 adapter| LZE-D2
Capped stub*| LZE-B2
- all sleeves must be equipped a capped stub to prevent warping during welding
Weld-in Fittings, EHEDG certified
Model| Description| Measuring unit connection| Pipe nominal
width
---|---|---|---
LZE-R| weld-in fittings| 2 = G 1/2
3 = G1| 25 =DN 25(only with
3 =G1)
40 =DN 40
50 =DN 50
65 =DN 65
80 =DN 80
Sleeves example:
Model LZE
G 1/2
Dimensions
Process connection G ½
EU Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Microwave Level Switch Model: LNM
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 EC guidelines are fulfilled:
2014/30/EU: EMC Directive
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, 28 April 2022
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: info.de@kobold.com
Internet: www.kobold.com
LNM K06/0422
Documents / Resources
|
KOBOLD LNM Microwave Level
Switch
[pdf] Instruction Manual
LNM Microwave Level Switch, LNM, Microwave Level Switch, Level Switch, Switch
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