Leuze Capacitive Sensor LCS User Manual

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Manual - Capacitive Sensor LCS

Safety Instructions and Functions and Features

• Please read the product description prior to set-up of the unit. Ensure that the product is suitable for your application without any restrictions.

• The unit conforms to the relevant regulations and EC directives.

• Improper or non-intended use may lead to malfunctions of the unit or to unwanted effects in your application.

• That is why installation, electrical connection, set-up, operation and maintenance of the unit must only be carried out by qualified personnel

authorized by the machine operator.

• The capacitive sensor detects without contact metals, almost all plastics, glass, ceramics, wood, paper, oils, greases, water and all hydrous

materials and indicates their presence by providing a switched signal.

Mounting Restrictions

Flush-mount (shielded)
proximity switches

... can be installed with their sensing faces flush
to the metal.
The distance between two proximity switches
(in row mounting) must be ≥ 2d.

Non-flush-mount
(unshielded) proximity
switches

The sensing face must extend ≥ 2s

from the

n

metallic installation medium. The distance
between two proximity switches must be ≥ 2d

① Sensing ① Sensing

②Clea

Opposing installation of
2 sensors

Housing size Material Tightening torque

es a minimum distance of a ≥ 4d

... requi
between the sensing faces..

To ensure that the sensors are not mechanically destroyed during
installation, make sure that you comply with the following torque figures.

M12×1 V2A 40 Nm
M18×1 V2A 60 Nm
M30×1,5 V2A 90 Nm

Electrical Definitions

DC 3-/4-wire PNP (+) sourcing

Normally open

Cable/terminals

Connecto

NPN (–) sinking
Cable/terminals

Normally closed

PNP/NPN selectable (LCS-1Q40P-F20BNP-K020P)

NO/NC user selectable
(XDC - output)

Connecto

Switching function
N.O. (normally open): The sensor closes a circuit to the load when

a target is detected or the sensor is
operated. Contacts are open when the

Wire colors,
marking per

DIN IEC 60757
sensor is not operated and when there is no
external force on the actuator.

BN brown
BK black
BU blue
WH white

N.C. (normally closed): The sensor opens a circuit to the load when

a target is detected or the sensor is
operated. Contacts are closed when the
sensor is not operated and when there is no
external force on the actuator.

Leuze electronic GmbH + Co. KG In der Braike 1 D-73277 Owen We reserve the right to make changes

• www.leuze.com Tel. [phone]/2017 - 50136911 - 1/2

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Adjustment

Flush (shielded) Sensors Non-Flush (unshielded) Sensors
Flush mountable sensors are normally being used for presence detection of objects or for indirect
point level detection of solids, powders or liquids. The following two setup routines help to assure
proper setup and operations. All LCS sensors allow sensitivity adjustment potentiometer.

These capacitive sensors use a larger spherical
electrical field which is especially suited as level
detectors for liquids, granulates or powders.

Object Fluid Plastic

Presence Detection of Solid Objects
The following procedures are outlined for
setting a normally open capacitive sensor for
ideal sensing conditions:

1. Mount the sensor in the actual sensing
position

2. Set up the target for the worst case
condition. This means for a presence
detection application to move the object to
the farthest occurring position from the
sensor.

3. All LCS capacitive sensors are already
factory preset to their maximum
operational sensing range. The sensor has
to move closer to the target object, if the
farthest object position does not assure a
reliable switching. Alternatively, a larger
sensor with a larger sensing range can be
chosen.

4. The sensitivity can now be reduced by
turning the potentiometer CCW until the
sensor switches off. Increase now the
sensitivity

CW by 1/2 turn to set the sensor to its optimal
sensitivity setting.
Example:
In the following example, a shielded capacitive
sensor in a M12 tubular housing will be used to
detect a ceramic plate.
The sensor is factory preset to a maximum
rated switching distance sn of 4 mm to metal or
by approximation to your hand. When moving
the sensor towards the target object, the rated
switching distance sn to the ceramic plate has
been reduced to approx. 2 mm. This distance is
now the maximum permissible switching
distance for the ceramic plate.

Note:
To ensure that Leuze LCS capacitive sensors
work reliably within their technical specifi­cations, they have a greater sensing distance
than the indicated maximum rated switching
distance sn in the datasheet. If the user decides

Point-Level Detection through Container Walls

Empty Setup (normally open)

1. Mount the sensor in the actual level sensing
position flush to the non-metallic container
wall.

2. All LCS capacitive sensors are already
factory preset to their maximum operational
sensing range. The sensor will initially trigger
on the container wall material.

3. The sensitivity has to be reduced by turning
the potentiometer CCW until the sensor
switches off. Increase now the sensitivity CW
by 1/2 turn to set the sensor to its optimal
sensitivity setting.

4. The sensor should switch on at 40% to 50%
sensing area coverage - readjust the
sensitivity CCW if the coverage is above
50% and CW if it is below 40%.

Full Setup (normally open)

1. Mount the sensor in the actual level sensing
position flush to the non-metallic container
wall.

2. All LCS capacitive sensors are already
factory preset to their maximum operational
sensing range. The sensor will initially switch
on to the container wall.

3. The sensitivity has to be reduced by turning
the potentiometer CCW until the sensor
switches off. Increase now the sensitivity CW
by 1/2 turn to set the sensor to its optimal
sensitivity setting.

4. The sensor should switch on at 40% - 50%
sensing area coverage - readjust the
sensitivity CCW if the coverage is above
50% and CW if it is below 40%.

Note:
The partition wall may only be made of glass or
plastic. A rule of thumb for the maximum
thickness of the wall yields a value of approx.
10 to 20% of the sensor‘s rated switching
distance, but max. 4 mm.

Direct Point-Level detection

Full Setup (normally open)

1. Mount the sensor in the actual level
sensing position with regards to the
minimum clearance guide line in our
mounting reference.

2. All LCS capacitive sensors are already
factory preset to their maximum
operational sensing range. The sensor will
initially switch on contact with the target
material.

3. The sensitivity has to be reduced by
turning the potentiometer CCW until the
sensor switches off. Now increase the
sensitivity CW by 1/2 turn to set the sensor
to its optimal sensitivity setting.

This setup procedure assures that the influence
of temperature and material build-up has been
reduced to a minimum. In some instances,the
target material creates extensive material build­up or has a very high relative dielectric constant
(conductivity) leading to uncontrollable
repetitive false triggering.

to adjust the sensor to a switching distance
greater than 2 mm for the above described
ceramic plate, the sensor will operate in an
unreliable mode. This entails a risk that tem­perature and other environmental factors or
electrical interferences may lead to unreliable
switching conditions.

CCW = counter-clockwise
CK = clockwise

① Metal
② Ceramic

① Wall thickness (max. 4 mm glass or plastic)
② Wate

① Wall
② Plastic granulate

Important: Different material properties and conditions have to be taken into consideration during

the calibration process. All Leuze LCS capacitive sensors are therefore equipped with highly
accurate trim potentiometers to adjust the device‘s sensitivity. Turning the potentiometer clockwise
(CW) increases the sensitivity, whereas counter-clockwise (CCW) turning reduces it.

Leuze electronic GmbH + Co. KG In der Braike 1 D-73277 Owen We reserve the right to make changes

• www.leuze.com Tel. [phone]/2017 - 50136911 - 2/2