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Operating instructions
Electronic level sensor
LK10xx
LK70xx
UK
80264293 / 00
06 / 2017
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Contents
1 Preliminary note ................................................................................................... 4
1.1 Symbols used ................................................................................................4
2 Safety instructions ...............................................................................................4
3 Functions and features ........................................................................................5
3.1 Applications ..................................................................................................5
3.2 Restriction of the application area ................................................................5
4 Getting started .....................................................................................................6
4.1 Example configuration 1 ................................................................................6
4.2 Example configuration 2 ................................................................................7
5 Function ............................................................................................................... 8
5.1 Measuring principle ......................................................................................8
5.2 Operating principle / features of the unit ........................................................8
5.2.1 Operating modes ..................................................................................9
5.2.2 Notes on the integrated overflow protection ......................................... 9
5.2.3 Display and switching functions ..........................................................10
5.2.4 Offset to indicate the real level in the tank .......................................... 11
5.2.5 Defined state in case of a fault ........................................................... 11
5.2.6 IO-Link function .................................................................................. 11
6 Installation..........................................................................................................12
6.1 Installation instructions for operation with overflow protection ...................13
6.2 Installation instructions for operation without overflow protection ..............14
6.2.1 Installation in the inactive zone ...........................................................14
6.2.2 Installation in the active zone A of the probe ......................................15
6.3 Further notes on installation ........................................................................16
6.3.1 Marking the installation height ...........................................................16
6.3.2 Mounting accessories: ........................................................................ 16
7 Electrical connection .......................................................................................... 17
8 Operating and display elements ........................................................................18
9 Menu .................................................................................................................. 19
9.1 Menu structure ............................................................................................. 19
10 Parameter setting ............................................................................................20
10.1 Parameter setting in general .....................................................................20
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10.2 Basic settings ...........................................................................................21
10.2.1 Setting the unit of measurement [uni] ............................................... 21
10.2.2 Setting the offset [OFS] ....................................................................21
10.2.3 Setting the medium [MEdI] ...............................................................21
10.2.4 Setting the overflow protection [OP] ...............................................22
10.2.5 Adjusting the overflow protection [cOP] ............................................22
10.3 Setting of output signals ............................................................................24
10.3.1 Setting the output function [oux] for OUTx .......................................24
10.3.2 Set the switching limits [SPx] /[rPx] (hysteresis function) ................. 24
10.3.3 Set the switching limits [FHx] / [FLx] (window function) ....................24
10.3.4 Set the switching delays [dSx] for switching outputs ........................ 24
10.3.5 Set the switch-off delay [drx] ...........................................................25
10.3.6 Set output logic [P-n] .......................................................................25
10.3.7 Response of the outputs in case of a fault [FOUx] ........................... 25
10.3.8 Configuration of the display [diS] ...................................................... 25
10.3.9 Reset all parameters to factory settings [rES] ..................................25
11 Operation .........................................................................................................26
11.1 Operating indicators ................................................................................... 26
11.2 Read the set parameters ...........................................................................26
11.3 Error indications .........................................................................................27
11.4 Output response in different operating states ............................................27
12 Technical data ..................................................................................................28
12.1 Setting values [OFS] .................................................................................. 28
12.2 Setting values [OP] .................................................................................... 28
12.3 Calculation aids [OP] .................................................................................29
12.3.1 Definition “from the cover“ ................................................................29
12.3.2 Definition “from the bottom“ ..............................................................29
12.4 Setting ranges [SPx] / [FHx] and [rPx] / [FLx] ........................................... 30
13 Maintenance / cleaning / change of medium ..................................................30
13.1 Maintenance information for operation without overflow protection ..........30
14 Factory setting .................................................................................................31
15 Applications......................................................................................................32
15.1 Hydraulic tank ............................................................................................ 32
15.2 Pumping station ......................................................................................... 33
15.3 Storage tank ..............................................................................................34
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1 Preliminary note
1.1 Symbols used
► Instructions
> Reaction, result
[…] Designation of keys, buttons or indications
→ Cross-reference
Important note
Non-compliance may result in malfunction or interference.
Information
Supplementary note.
2 Safety instructions
• Please read this document prior to set-up of the unit. Ensure that the product is
suitable for your application without any restrictions.
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property can occur. Installation, electrical connection,
set-up, operation and maintenance of the unit must be carried out by qualified
personnel authorised by the machine operator.
• In order to guarantee the correct operation of the unit, it is necessary to use the
unit in media for which it is sufficiently resistant (→ Technical data).
• The responsibility as to the suitability of the unit for the application lies with the
operator The manufacturer assumes no liability for consequences of misuse by
the operator.
• Improper installation and use of the units result in a loss of the warranty claims.
• The unit complies with the standard EN 61000-6-4. The unit may cause radio
interference in domestic areas. If interference occurs, the user must take
appropriate remedial actions.
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3 Functions and features
3.1 Applications
The unit was specially designed to meet the requirements of machine tool
building. It is specially suitable for monitoring coolant emulsions (also dirty) as well
as cutting and hydraulic oils.
3.2 Restriction of the application area
• The unit is not suitable for:
- acids and alkalis
- hygienic and electroplating applications
- highly conductive and adhesive media (e.g. glue, shampoo)
- granulates, bulk material
- use in grinders (increased risk of formation of deposits).
• It is possible that foam of good conductivity is detected as level:
► Test proper functioning in an application test.
• For water and hydrous media with temperatures > 35 °C, install the unit in a
climatic tube (→ accessories).
• For automatic medium detection:
For media which are very inhomogeneous, separate from each other and thus
forming separation layers (e.g. oil layer on water), the following applies:
► Test proper functioning in an application test.
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4 Getting started
For fast set-up, the example configurations described in the following can be used
for most applications. The indicated minimum distances apply exclusively for each
separately described case.
4.1 Example configuration 1
Applied sensor: LK1022 (probe length L = 264 mm)
Medium to be detected: Mineral oil
Operating mode: Manual media selection with overflow protection
(factory setting LK10xx) → 5.2.1
Type of installation: Metal tank, installation to Fig.4-1
► Install sensor.
► Observe the distances (x), (u) and (c):
x: min. 4.0 cm
u: min. 1.0 cm
c: max. 14.0 cm
► Ground sensor and tank via an electrical
connection (→ 7).
► Observe the parameter setting sequence:
- [MEdI] = [OIL.2] (→ 10.2.3)
- [OFS] = (u); e.g. (u) = 2.0 cm (→ 5.2.4)
- [OP]: Set the overflow protection OP at a
distance (y) greater than 4.5 cm below the
mounting element.
For distances (y) smaller than 4.5 cm there
may be malfunctioning and error messages
during the adjustment process [cOP]
Fig. 4-1
OP
c
Step increment and setting range: → 12.2
Calculation aids for [OP]: → 12.3
► Adjustment of the overflow protection OP to [cOP] (→ 10.2.5)
> The unit is ready for operation.
► Make further settings if necessary.
► Check whether the unit operates correctly.
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4.2 Example configuration 2
Applied sensor: LK7023 (probe length L = 472 mm)
Medium to be detected: Coolant emulsion
Operating mode: Automatic medium detection
(factory setting LK70xx) → 5.2.1.
Type of installation: Metal tank, installation to Fig.4-2
► Install sensor.
► Observe the distances (x), (u) and (c):
x: min. 4.0 cm
u: min. 1.0 cm
c: max. 23.0 m
► Ground sensor and tank via an electrical
connection (→ 7).
► Observe the maximum permissible level (b).
A distance (a2) greater than 5.0 cm must
be observed between maximum level (b)
and mounting element.
► Observe the parameter setting sequence:
- [MEdI] = [Auto] (→ 10.2.3)
- [OFS] = (u), e.g. (u) = 1.0 m (→ 5.2.4)
- [SP1] = Set the switch point at a distance
(a2) greater than 5.0 cm below the
mounting element.
Fig. 4-2
c
bu a2
x
Adjustable in step increments of 0.5 cm.
Switch point [SP1] is used as overflow protection (pump off, close inlet, ...)
► Unit must be reinitialised:
► Switch the operating voltage off and on again.
> The unit is ready for operation.
► Make further settings if necessary.
► Check whether the unit operates correctly.
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5 Function
5.1 Measuring principle
The sensor determines the level according to the capacitive measuring principle:
• An electrical field (E) is generated
and influenced by the medium to be
detected. This change to the field
causes a measurement signal that
is electronically evaluated.
• The dielectric constant of a medium
is important for its detection. Media
with a high dielectric constant
(e.g. water) generate a strong
measurement signal, media with a
low dielectric constant (e.g. oils) a
correspondingly lower signal.
• The active measurement zone of
the sensor probe is composed of
16 capacitive measuring segments.
They generate measurement
signals depending on the degree of
coverage.
Fig. 5-1
A II
E
I: Inactive zone
A: Active zone (16 active segments)
E: Electrical field
Dimensions → Technical data sheet
5.2 Operating principle / features of the unit
The unit can be installed in tanks of different sizes.
2 outputs are available. They can be set separately.
OUT1 Switching signal for level limit value / IO-Link
OUT2 Switching signal for level limit value
To adjust the unit to the application, choose the required operating modes.
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5.2.1 Operating modes
1. Manual media selection with overflow protection (factory setting LK10xx)
Recommended! Highest operational reliability!
The medium to be detected is set manually [MEdI]. In addition, an integrated,
independently functioning overflow protection is available.
2. Manual media selection without overflow protection
Medium operational reliability!
The medium to be detected is set manually as described under 1. However
,
the overflow protection is deactivated. For this reason, no adjustment is
possible.
3. Automatic media detection (factory setting LK70xx)
Lowest operational reliability!
Each time the operating voltage is switched on, the unit adjusts itself to the
medium and the installation environment.
For automatic media detection, no overflow protection is available!
Automatic media detection can only function properly under certain
conditions (e.g. compliance with special mounting specifications,
restrictions for operation and maintenance).
5.2.2 Notes on the integrated overflow protection
With the parameter [OP] (OP = overfill protection), one of the upper measuring
segments is defined as integrated overflow protection.
• If the overflow protection OP is activated, an adjustment to the installation
situation has to be made [cOP].
• The overflow protection OP can be deactivated ([OP] = [OFF]).
Deactivating the overflow protection can impair the operational reliability.
For optimum operation and maximum operational reliability, we therefore
recommend to not deactivate the overflow protection!
• The overflow protection is the maximum limit of the measuring range. The
switch points [SPx] / [FHx] are always below [OP]!
• The overflow protection is not assigned to a separate output! It offers additional
protection and only leads to switching if one of the outputs has not commuted
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even though the corresponding switch point has been exceeded (e.g. due to
application-related malfunctions).
• Typically the overflow protection OP reacts when the selected measuring
segment has been reached (a few mm before the set OP value).
• The overflow protection OP replies immediately and without delay. The set
delay times (e.g. of a switch point directly below) have no effect on the overflow
protection OP.
• The response of the overflow protection is indicated on the display ("Full" and
indication of the current level change every second).
5.2.3 Display and switching functions
The unit displays the current level, selectable in cm or inch. The display unit is
defined by parameter setting. The set unit of measurement and the switching
status of the outputs are indicated by LEDs. The unit signals via two switching
outputs (OUT1, OUT2) that a set limit has been exceeded or that the level is
below the limit. The parameters of the switching outputs can be set.
• Hysteresis function / normally open (Fig. 5-2): [oux] = [Hno].
• Hysteresis function / normally closed (Fig. 5-2): [oux] = [Hnc].
First the set point [SPx] is set, then the reset point [rPx] with the requested
difference.
The hysteresis for the overfill protection OP is fixed.
• Window function / normally open (Fig. 5-3): [oux] = [Fno].
• Window function / normally closed (Fig. 5-3): [oux] = [Fnc].
The width of the window can be set by means of the difference between
[FHx] and [FLx]. [FHx] = upper value, [FLx] = lower value.
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Fig. 5-2 Fig. 5-3
SP
rP
t
L
FH
FL
1
0
1
0
FE
Fno
Fnc
L : level HY: hysteresis FE:window
5.2.4 Offset to indicate the real level in the tank
The distance between tank bottom and lower edge of the probe can be entered as
offset value [OFS]. So display and switch points refer to the actual level (reference
point = bottom of the tank).
For [OFS] = [0]: the reference point is the lower edge of the probe.
The set offset only refers to the display on the unit. It has no effect on
the process value transmitted via IO-Link. The OFS parameter, however,
is correctly transmitted via IO-Link and can therefore be taken into
consideration. More information → 5.2.6 .
5.2.5 Defined state in case of a fault
In case of a fault, a safe state can be defined for each output. If a fault is detected
or if the signal quality is below a minimum value, the outputs pass into a defined
state. For this case the response of the outputs can be set via the parameters
[FOU1], [FOU2] (→ 10.3.7).
5.2.6 IO-Link function
This unit has an IO-Link communication interface which enables direct access to
process and diagnostic data.
In addition it is possible to set the parameters of the unit during operation.
Operation of the unit via IO-Link interface requires an IO-Link capable module
(IO-Link master).
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With a PC, suitable IO-Link software and an IO-Link adapter cable communication
is possible when the system is not in operation.
For the IODDs necessary for the configuration of the unit, detailed information
about process data structure, diagnostic information, parameter addresses and
the necessary information about the required IO-Link hardware and software visit
www.ifm.com.
6 Installation
Fig. 6-1
OP
c
L:
M:
c:
Probe length
Zone for mounting elements
Maximum extension length
u ... y:
OP:
B:
Minimum distances
Overflow protection
Metal object inside the tank
Table 6-1
LKx022 LKx023 LKx024
[cm] [inch] [cm] [inch] [cm] [inch]
L (rod length) 26.4 10.4 47.2 18.6 72.8 28.7
M (mounting zone)
14.0 5.5 23.0 9.1 36.0 14.2
c (max. extension length)*
* Applies to installation as shown (wall thickness of the tank lid not taken into account;
mounting element does not protrude into the tank).
Otherwise note mounting zone M.
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6.1 Installation instructions for operation with overflow
protection
[MEdI] = [CLW..] or [OIL..]
[OP] = [value ...] (Overflow protection OP activated)
It is permitted to fix the mounting elements within the mounting zone (M)
(Fig. 6-1).
► Observe the maximum permitted extension length (c) according to Table 6-1.
► Observe the minimum distances according to Fig. 6-1 and Table 6-2.
► Observe the notes on the integrated overflow protection!
The overflow protection (OP) must:
1. be below the mounting element
2. be adjusted at a minimum distance (y) to it, measured between the
lower edge of the mounting element and the OP value
.
Table 6-2
MEdI = CLW.1 MEdI = CLW.2, OIL.1 MEdI = OIL.2
[cm] [inch] [cm] [inch] [cm] [inch]
x 2.0 0.8 3.0 1.2 4.0 1.6
u 1.0 0.4 1.0 0.4 1.0 0.4
y (LKx022) 2.5 1.0 3.5 1.4 4.5 1.8
y (LKx023) 4.5 1.8 5.5 2.2 6.5 2.6
y (LKx024) 6.0 2.4 7.0 2.8 8.0 3.2
v 4.5 1.8 4.5 1.8 4.5 1.8
w 4.0 1.6 5.0 2.0 6.0 2.4
Calculation aids for [OP]: (→ 12.3).
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6.2 Installation instructions for operation without overflow
protection
[MEdI] = [Auto] or [OP] = [OFF] (Overflow protection OP deactivated!)
6.2.1 Installation in the inactive zone
Between the maximum level (b1) and the inactive zone (I1), minimum
distance (a1) must be adhered to (see Fig. 6-2 and Table 6-3)!
► Fix the unit using mounting elements
in the inactive zone (I1). The extension
length (c) may not exceed (I1) (see
Table 6-3).
► Make sure that the maximum level (b1)
is not exceeded after installation (see
Table 6-3).
► Observe further minimum distances
according to Table 6-4.
Fig. 6-2
A I1
c
I2
b1 a1
x
u
I1 / I2: Inactive zones
A: Active zone
a1: Minimum distance between the
inactive zone (I1) and the maximum
level (b)
b1: Max. level from the lower edge of the
sensor (without offset)
c: Max. permitted extension length
(Observe footnote Table 6-1)
Table 6-3
LKx022 LKx023 LKx024
[cm] [inch] [cm] [inch] [cm] [inch]
I1 5.3 2.1 6.0 2.4 10.4 4.1
A 19.5 7.7 39.0 15.4 58.5 23.0
a1 1.0 0.4 1.5 0.6 2.5 1
b1 20.0 7.9 39.5 15.6 59.5 23.4
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6.2.2 Installation in the active zone A of the probe
A minimum distance (a2) between maximum level (b2) and mounting
element has to be observed (see Fig. 6-3 and Table 6-4).
► Fix mounting elements in the mounting
zone (M). Adhere to maximum
permitted extension length (c) (see
Table 6-1 ).
► Ensure that the maximum level (b2)
is not exceeded after completed
installation:
► (b) = (L) - (c) - (a2) (without offset)
► Observe further minimum distances
according to Table 6-4.
Fig. 6-3
cb2
L
u a2
x
c: Max. permitted extension length
a2: Minimum distance between the
mounting element and the maximum
level (b).
b2: Max. level from the lower edge of
the sensor
Table 6-4
MEdI = CLW.1 MEdI = CLW.2, OIL.1 MEdI = OIL.2 / Auto
[cm] [inch] [cm] [inch] [cm] [inch]
x 2.0 0.8 3.0 1.2 4.0 1.6
u 1.0 0.4 1.0 0.4 1.0 0.4
a2 (LKx022) 2.0 0.8 2.5 1.0 3.0 1.2
a2 (LKx023) 4.0 1.6 4.5 1.8 5.0 2.0
a2 (LKx024) 6.0 2.4 7.0 2.8 8.0 3.2
v *
)
4.5 1.8 4.5 1.8 4.5 1.8
w *
)
4.0 1.6 5.0 2.0 6.0 2.4
*) → Fig. 6-1.
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In case of automatic medium detection [MEdl] = [Auto] or deactivated
overflow protection [OP] = [OFF], the sensor reinitialises itself each time it
is switched on and makes adjustments to the medium and the installation
environment. The active zone / measuring range may not be completely
covered by the medium! The indicated minimum distances ensure this.
Too short distances may lead to maladjustments and malfunctions!
6.3 Further notes on installation
• For mounting in plastic pipes/plastic tanks, the inside (pipe) diameter must at
least be 12.0 cm (4.8 inch). Install sensor in the centre.
• For mounting in metal pipes, the inside pipe diameter (d) must be at least:
Table 6-5
MEdI = CLW.1 MEdI = CLW.2, OIL.1 MEdI = OIL.2 / Auto
[cm] [inch] [cm] [inch] [cm] [inch]
d 4.0 1.6 6.0 2.4 10.0 4.0
Marking the installation height
► Fix the set installation height with the supplied
stainless steel tube clip.
If the sensor is removed from the fixture for
maintenance reasons, the clip serves as a
limit stop when remounting the sensor. Thus
an inadvertent maladjustment of the sensor is
excluded. This is in particular necessary to ensure
correct functioning of the overflow protection.
► Fit the stainless steel tube clip using pliers.
► Ensure a safe fit.
► To remove the clip it has to be destroyed.
6.3.1 Mounting accessories:
Available accessories: www.ifm.com
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7 Electrical connection
The unit must be connected by a qualified electrician.
The national and international regulations for the installation of electrical
equipment must be adhered to.
Voltage supply according to EN 50178, SELV, PELV.
► Disconnect power.
► Connect the unit as follows:
Core colours
43
2 1
BN
WH
BK
BU
4
1
3
2
OUT2
L
+
L
OUT1
BK black
BN brown
BU blue
WH white
OUT1: Switching output / IO-Link
OUT2: Switching output
Colours to DIN EN 60947-5-2
Example circuits
2 x positive switching 2 x negative switching
L
L
+
3
4
2
1
BU
BK
WH
BN
2: OUT2
4: OUT1
L
L
+
3
4
2
1
BU
BK
WH
BN
2: OUT2
4: OUT1
For safe function, the sensor housing must be
electrically connected to the counter-electrode
(grounding).
► For this, use the housing connection (see
drawing) and a short piece of cable with a core
cross-section of at least 1.5 mm2.
When using metal tanks, the tank wall serves as
the machine earth.
For plastic tanks, a counter-electrode must be
provided, e.g. a metal plate inside the tank in
parallel with the probe. Adhere to minimum
distances to the probe.
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8 Operating and display elements
10
Mode/Enter Set
1 2 7
8
3 4 5 6
11
9
1 to 8: Indicator LEDs
LED 1 Indication in cm.
LED 2 Indication in inch.
LED 3 - 6 Not used.
LED 7 Switching status OUT2 (lights when output 2 is switched).
LED 8 Switching status OUT1 (lights when output 1 is switched).
9: [Mode / Enter] button
- Selection of the parameters and acknowledgement of the parameter values
10: [Set] button
- Setting of the parameter values (scrolling by holding pressed; incremental by pressing
briefly).
12: Alphanumeric display, 4 digits
- Display of the current level.
- Indication of the parameters and parameter values.
- Operating and fault indication.
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9 Menu
9.1 Menu structure
M
M
SP1 FH1
S
M
M
M
M
M
M
M
M
M
M
M
M
M
S
10.0 10.0
8.0
rP1 FL1
19.5
SP2
rP2
MEdl CLW.1
OP
20.0
20.4
cOP
EF
donE
S
S
S
S
S
S
M
M
rES
S
M
M
M
M
M
M
M
M
S
- - - -
ou1
Hno
0.0
ou2
dS1
dr1 0.0
S
S
S
M
Hnc
M
M
dS2
0.0
S
M
M
M
M
M
uni
P-n
M
M
dr2
0.0
S
S
S
S
M
M
M
OFS
S
M
M
M
S
0
FOU1
OFF
M
S
FOU2
OFF
diS
On
cm
PnP
M
S
M
S
M
9.5 9.5
FH2 20.0
FL2
S
M
S
M
19.5
cOP
Menu items highlighted in grey,
e.g. [
cOP
], are only active when assigned parameters have been selected .
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10 Parameter setting
10.1 Parameter setting in general
1
Mode/Enter Set
► Press [Mode/Enter] several times
until the required parameter is
displayed.
To select parameters in the extended
menu (menu level 2):
► Select [EF] and briefly press [Set].
2
Mode/Enter Set
► Press and hold [Set].
> The current parameter value flashes
for 5 s.
> Value is increased* (step by step
by pressing the button once or
continuously by keeping the button
pressed).
3
Mode/Enter Set
► Briefly press [Mode/Enter]
(= confirmation).
> The parameter is displayed again; the
new parameter value is effective.
4
Change more parameters:
► Start again with step 1.
Finishing the parameter setting:
► Wait for 30 s or press and hold
[Mode/Enter].
> The current measured value is
displayed.
► Release [Mode/Enter],
> the parameter setting is completed.
*) Decrease the value: let the display move to the maximum setting value.
Then the cycle starts again at the minimum setting value.
Timeout: If no button is pressed for 30 s during programming, the unit returns to the
operating mode with unchanged values (exception: cOP).
Locking / unlocking: The unit can be locked electronically to prevent unauthorised setting
(factory setting: not locked).
► Make sure that the unit is in the normal operating mode.
To lock the unit:
► press both buttons simultaneously for 10 s.
> [Loc] is displayed.
To unlock the unit:
► press both buttons simultaneously for 10 s.
> [uLoc] is displayed.
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The unit can be programmed before or after installation. Exception: to
adjust the overflow protection [cOP], the unit must be installed in the tank.
10.2 Basic settings
Setting ranges of all parameters: → 12
Factory settings of all parameters: → 14
10.2.1 Setting the unit of measurement [uni]
► Enter [uni] before entering the values for SPx, rPx, OP or OFS.
This avoids unintentional maladjustments.
► Select [uni]
► Set the unit of measurement: [cm], [inch]
uni
10.2.2 Setting the offset [OFS]
The distance between tank bottom and lower edge of the measuring probe can be
entered as offset value (→ 5.2.4).
► Set [OFS] before entering the values for SPx, rPx or OP.
This avoids unintentional maladjustments.
► Select [OFS].
► Set the value for the offset. Note the set unit of measurement [uni].
OFS
10.2.3 Setting the medium [MEdI]
► Select [MEdI] and set the corresponding sensitivity:
MEdI
[CLW.1] = water, hydrous media, coolant emulsions.
[CLW.2] = water-based media for temperatures > 35 °C (installation in
climatic tube).
[OIL.1] = oils with an increased DC value (e.g. some synthetic oils).
[OIL.2] = oils with a low DC value (e.g. mineral oils).
[Auto] = automatic medium detection.
► In case of doubt, select [OIL.2] for oils.
► Proper functioning is to be ensured by carrying out an application test!
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The settings [CLW.1] and [CLW.2] suppress deposits (e.g. metal swarf).
The settings [OIL.1] and [OIL.2] suppress a bottom layer of higher dielectric
water or swarf which is a few cm high. If no oil layer is present (or if it is
very thin), the bottom layer is detected.
With the setting [MEdI] = [Auto], no overflow protection is available. In that case,
the menu points [OP] and [cOP] are not available.
10.2.4 Setting the overflow protection [OP]
► Comply with minimum distances and installation instructions.
► Select [OP].
► Define the position of the overflow protection.
The option [OP] = [OFF] deactivates the overflow protection.
OP
► Set [OP] before [SPx] or [FHx].
> [SPx] / [FHx] decreases if [OP] is reduced to a value ≤ [SPx] / [FHx] after
setting [SPx] / [FHx].
> If [OP] is increased, [SPx] / [FHx] also increases if [OP] and [SPx] /
[FHx] are close together (1 x step increment).
When the overflow protection is deactivated [OP] = [OFF] or
[MEdl] = [Auto], the safe function of the sensor must be verified with
particular care. For this, switch-on and switch-off processes and special
operating states such as very full tanks, possible maintenance and cleaning
operations are to be considered in the verification.
For setting [OP] = [OFF] the menu item [cOP] is not available.
10.2.5 Adjusting the overflow protection [cOP]
Only adjust the overflow protection OP when the unit is installed.
If possible, carry out the adjustment when the tank is empty!
However, the tank may be partly filled.
► Make sure that the overflow protection OP is not covered by the
medium! Observe the minimum distance between the overflow
protection OP and the level (→ Table 10-1).
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► Select [cOP]
► Press [SET] and keep it pressed.
> [cOP] flashes for some seconds; then the continuous display indicates
that the adjustment is being made.
> If the adjustment is successful, [donE] is displayed.
► Confirm with [Mode/Enter].
> If the adjustment is not successful, [FAIL] is displayed.
► Lower the level if necessary or correct the position of the overflow
protection [OP] and repeat the adjustment operation.
cOP
Minimum distance between the overflow protection OP and the level during
adjustment:
Table 10-1
[cm] [inch]
LKx022 2.0 0.8
LKx023 3.5 1.4
LKx024 5.0 2.0
The position of the overflow protection OP can be determined by calling up
the parameter [OP]. Note the offset if necessary.
The current level is to be determined manually since the unit is not yet
ready for operation before the adjustment.
With the setting [MEdI] = [Auto] or [OP] = [OFF], the parameter [cOP] is not
available.
When the overflow protection is activated ([OP] = [value...]), an adjustment
[cOP] must be carried out each time:
• [MEdI] or [OP] has been changed. In this case appears in the
display.
• the installation position (height, orientation) has been changed.
• the connection between the sensor and the tank ground (e.g. length of
the jumper cable) has been changed.
With deactivated overflow protection [OP] = [OFF] or [MEdI] = [Auto]:
To assign the basic settings and to adapt to the medium and installation
environment the unit has to be reinitialised when installed.
► Switch the operating voltage off and on again.
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10.3 Setting of output signals
10.3.1 Setting the output function [oux] for OUTx
► Select [oux] and adjust the switching function:
ou1
ou2
[Hno] = hysteresis function / normally open
[Hnc] = hysteresis function / normally closed
[Fno] = window function / normally open
[Fnc] = window function / normally closed
If the switching output is used as an overflow protection, the setting
[oux] = [Hnc] (NC function) is recommended. The principle of normally
closed operation ensures that wire break or cable break is also detected.
10.3.2 Set the switching limits [SPx] /[rPx] (hysteresis function)
► Make sure that the function [Hno] or [Hnc] is set for [oux].
► Set [SPx] first, then [rPx].
► Select [SPx] and set the value at which the output is set.
SP1
SP2
► Select [rPx] and set the value at which the output resets.
rP1
rP2
[rPx] is always smaller than [SPx]. The unit only accepts values which are lower than the
value for [SPx]. If [SPx] is shifted, [rPx] also shifts provided that the lower end of the setting
range is not reached.
10.3.3 Set the switching limits [FHx] / [FLx] (window function)
► Make sure that for [oux] the function [Fno] or [Fnc] is set.
► Set [FHx] first, then [FLx].
► Select [FHx] and set the upper limit of the acceptable range.
FH1
FH2
► Select [FLx] and set the lower limit of the acceptable range.
FL1
FL2
[FLx] is always lower than [FHx]. The unit only accepts values which are lower than the
value for [FHx]. If [FHx] is shifted, [FLx] also shifts provided that the lower end of the setting
range is not reached.
10.3.4 Set the switching delays [dSx] for switching outputs
► Select [dSx] and set the value between 0.0 and 60 s.
The switching delay takes place according to VDMA.
dS1
dS2
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10.3.5 Set the switch-off delay [drx]
► Select [drx] and set the value between 0.0 and 60 s.
The switching delay takes place according to VDMA.
dr1
dr2
10.3.6 Set output logic [P-n]
► Select [P-n] and set [PnP] or [nPn].
P-n
10.3.7 Response of the outputs in case of a fault [FOUx]
► Select [FOUx] and set the value:
FOU1
FOU2
[On] = the output switches ON in case of a fault
[OFF] = the output switches OFF in case of a fault.
A hardware fault or too low a signal quality is considered to be a fault.
Overflow is not considered to be a fault.
10.3.8 Configuration of the display [diS]
► Select [diS] and set the value:
diS
[On] = The display is switched on in the operating mode.
Update of the measured values every 500 ms
[OFF] = The display is switched off in the operating mode. When one of
the buttons is pressed, the current measured value is displayed
for 30 s. The indicator LEDs remain active even if the display is
deactivated.
10.3.9 Reset all parameters to factory settings [rES]
► Select [rES]
► Press and hold [Set] until [----] is displayed.
► Briefly press [Mode/Enter].
> The unit reboots and the factory settings are restored.
rES
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11 Operation
After switch-on of the operating voltage, the unit is in the operating mode
(= normal operating mode). It carries out its measurement and evaluation
functions and generates output signals according to the set parameters.
► Check whether the unit operates correctly.
11.1 Operating indicators
[----] (continuous) Initialisation phase after power on.
[Numerical value] + LED 1 Current level in cm.
[Numerical value] + LED 2 Current level in inch.
LED 7 / LED 8 Switching status OUT2 / OUT1 (LED x is lit if output x is
switched).
[----] Level below the active zone.
[FULL] + [numerical value]
alternately
The overflow protection OP is reached (overflow warning) or
the level is above the active zone.
It is necessary to adjust [cOP] of the overflow protection OP.
[Loc] Unit locked via operating keys; parameter setting impossible.
For unlocking press the two setting buttons for 10 s.
[uLoc] Unit is unlocked / parameter setting is possible again.
[C.Loc] The unit is temporarily locked. Parameter setting via IO-Link is
active (temporary locking).
[S.Loc] Unit is permanently locked via software. This locking can only
be removed with a parameter setting software.
11.2 Read the set parameters
► Briefly press [Mode/Enter] (if required, repeat several times).
> Menu items are passed through until the requested parameter has been
reached.
► Briefly press [Set].
> Respective parameter value is displayed for 30 s.
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11.3 Error indications
Possible cause Recommended measures
[Err] Fault in the electronics. ► Replace the unit.
[SEnS]
• Interfering sources
• Faulty wiring
• Problems with the supply
voltage
► Check electrical connection.
► Check the connection between the
sensor and the tank ground.
[FAIL]
Error during adjustment of the
overflow protection OP:
• Overflow protection covered by
the medium during adjustment.
• Overflow protection soiled.
• Minimum distances too short.
• Mounting element detected
below the overflow protection.
• Measured value not constant.
► Lower the level, if necessary.
► Clean the probe.
► Observe the notes on installation.
► Correct the position of the overflow
protection.
► Repeat the adjustment.
► Deactivate OP (→ 5.2.2).
[SC1] + LED 8
[SC2] + LED 7
Flashing:
Short circuit in switching output
OUT1 or OUT2.
► Remove the short circuit.
[SC] + LED 7
+ LED 8
Flashing:
Short circuit in both switching
outputs.
► Remove the short circuit.
[PArA] Faulty data set. ► Reset to factory settings [rES].
11.4 Output response in different operating states
Table 11-1
OUT1 OUT2
Initialisation phase OFF OFF
Overflow protection OP not
adjusted
OFF OFF
Overflow protection OP not
adjusted or deactivated,
normal operation
According to the level and
[ou1] setting
According to the level and
[ou2] setting
Fault
OFF for [FOU1] = [OFF]
ON for [FOU1] = [On]
OFF for [FOU2] = [OFF]
ON for [FOU2] = [On]
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12 Technical data
Technical data and scale drawing at www.ifm.com.
12.1 Setting values [OFS]
Table 12-1
[cm] [inch]
Setting range 0...200.0 0...78.8
LKx022
LKx023
LKx024
LKx022
LKx023
LKx024
Step increment 0.5 1 0.2 0.5
Setting values [OP]
Tab. 12-2
OPx
LKx022 LKx023 LKx024
[cm] [inch] [cm] [inch] [cm] [inch]
20,4 8,0 40,7 16,0 61 23,9
19,1 7,5 38,3 15,1 57 22,4
17,9 7,1 35,8 14,1 53 21,0
16,7 6,6 33,4 13,1 50 19,5
15,5 6,1 31,0 12,2 46 18,1
14,3 5,6 28,5 11,2 42 16,7
13,0 5,1 26,1 10,3 39 15,2
11,8 4,7 23,6 9,3 35 13,8
10,6 4,2 21,2 8,3 31 12,3
9,4 3,7 18,8 7,4 28 10,9
8,2 3,2 16,3 6,4 24 9,5
6,9 2,7 13,9 5,5 20 8,0
OPx: Setting Range [OP]
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The indicated values for [OP] refer to the distance between OP and the
lower edge of the probe. The values apply if [OFS] = [0].
If [OFS] > [0], they increase by the set offset value.
Example LK1022: According to Table 12-2 OP has to be set to segment
20.4 cm.
[OFS] = 7.0 cm
[OP] is to be set to 20.4 cm + 7.0 cm = 27.4 cm.
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12.2 Calculation aids [OP]
For proper functioning of the overflow protection OP a minimum distance
(y) (Fig. 12-1) must be observed (→ 6.1).
The following applies (Fig. 12-1):
B + c = L + u
and
B = z + y
B: tank height
c: outside length (maximal → 6)
y: required response level OP
from the cover (minimum →
6.1, maximum → 12.2)
L: probe length
u: distance between probe and tank
bottom
z: required response level OP from
the bottom (maximum: z < L - c - y
or z < B - y)
12.2.1 Definition “from the cover“
Requested distance (y) of the overflow protection OP
“from the cover“ is defined.
• Without offset ([OFS] = [0]): [OP] = L - c - y
• With offset ([OFS] = u): [OP] = L - c - y + u
or
[OP] = B – y
Example:
c = 3.0 cm, y = 5.0 cm, u = 1.0 cm
Without offset: [OP] = 26.4 cm - 3.0 cm - 5.0 cm
= 18.4 cm
With offset: [OP] = 26.4 cm - 3.0 cm - 5.0 cm - 1.0 cm
= 19.4 cm
Fig. 12-1
OP
c
z
B
L
12.2.2 Definition “from the bottom“
Response level (z) of the overflow protection OP from the tank bottom is defined.
• Without offset ([OFS] = [0]): [OP] = z - u
• With offset ([OFS] = u): [OP] = z
Example:
z = 18.0 cm (from the tank bottom), u = 1.0 cm
Without offset: [OP] = 18.0 cm - 1.0 cm = 17.0 cm
With offset: [OP] = 18.0 cm
Round the calculated value to the next lower adjustable value → 11.2.
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12.3 Setting ranges [SPx] / [FHx] and [rPx] / [FLx]
Table 12-3
LKx022 LKx023 LKx024
[cm] [inch] [cm] [inch] [cm] [inch]
[SPx] / [FHx] 2.5...20.0 1.0...8.0 3.5...39.0 1.4...15.4 6.0...59.0 2.5...23.5
[rPx] / [FLx] 2.0...19.5 0.8...7.8 3.0...38.5 1.2...15.2 5.0...58.0 2.0...23.0
Step
increment
0.5 0.2 0.5 0.2 1.0 0.5
The values apply if [OFS] = [0].
If [OFS] > [0], they increase by the set offset value.
13 Maintenance / cleaning / change of medium
When removing or installing the unit for maintenance and cleaning work:
► Make sure that the stainless steel tube clip is fixed to the sensor.
> It must be possible to exactly reproduce the installation height and position!
► Remove the sensor and clean it / carry out maintenance.
► Install sensor exactly in the same position as before.
► Otherwise check the parameter [OP] and carry out [cOP] once again.
13.1 Maintenance information for operation without overflow
protection
[MEdI] = [Auto] or [OP] = [OFF] (the overflow protection is deactivated).
The unit must be reinitialised in the following cases (switch the operating voltage
briefly off and on again):
• After all maintenance operations.
• After cleaning operations (e.g. water jet cleaning of the sensor probe)
• If the sensor has been removed from the tank and inserted again during
operation.
• If the active zone of the sensor has been touched with the hand or grounded
objects (e.g. a screwdriver, a cleaning lance).
• If the connection between the sensor and the tank wall/counter-electrode has
been changed.
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• After a change of media with dielectric constants that differ significantly. For
manual selection of media, first the [MEdI] setting needs to be adjusted.
14 Factory setting
Factory setting User setting
LKx022 LKx023 LKx024
SP1 10.0 19.5 29.0
rP1 9.5 19.0 28.0
SP2 20.0 39.0 59.0
rP2 19.5 38.5 58.0
OP*
20.4 40.7
60.6
MEdI LK10xx: CLW.1
LK70xx: Auto
cOP ---rES ---ou1 Hno
ou2 Hnc
dS1 0.0
dr1 0.0
dS2 0.0
dr2 0.0
uni cm
P-n PnP
OFS 0
FOU1 OFF
FOU2 OFF
diS On
* Not available / inactive for LK70xx
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15 Applications
15.1 Hydraulic tank
Minimum level monitoring with early warning and alarm
Switching output 1: early warning
SP1 slightly above rP1 (to suppress wave movements)
rP1 below preset level → early warning, start refilling
ou1 hysteresis function, normally closed (Hnc)
Switching output 2: alarm
SP2 min. value reached again → alarm reset
rP2 below min. value → alarm
ou2 hysteresis function, normally open (Hno)
XX.X = display value,
A = early warning, B = alarm
• If the level is below rP1, output 1 switches until liquid is refilled. If SP1 is
reached again, output 1 switches off.
• If the level is above SP2, output 2 switches. If the level falls below rPs or if
there is a wire break, output 2 switches off.
• By setting SP1 the maximum level can be controlled / monitored: the value of
SP1 determines up to which level (max) is to be refilled. When the maximum
level is reached, this is signalled by the LED OUT1 going out and output 1
switching off.
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15.2 Pumping station
Empty the tank with overflow protection
Switching output 1: control to empty tank
SP1 upper value exceeded → submersible pump ON
rP1 lower value reached → submersible pump OFF
ou1 hysteresis function, normally open (Hno)
Switching output 2: overfill protection (for the LK10xx, it is recommended to use the
integrated overflow protection (parameter [OP])
SP2 maximum value exceeded → alarm
rP2 slightly below SP2 (to suppress wave movements)
ou2 hysteresis function, normally closed (Hnc)
OP overflow protection *)
XX.X = display value,
A = empty, B = overflow protection
• If SP1 is exceeded, output 1 switches (submersible pump ON). If the level is
below rP1 again, output 1 switches off (submersible pump OFF).
• If SP2 is exceeded or if there is a wire break, output 2 switches off.
*) It is recommended to use the integrated overflow protection (parameter [OP]). If SP2 is set
to a maximum value, the response of the overflow protection (OP) immediately leads to a
switching operation. In that case, SP2 functions as a directly acting overflow switch point.
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15.3 Storage tank
Monitoring of the acceptable range (alarm) and level control
Switching output 1: refilling
SP1 upper preset value reached → finish refilling
rP1 below lower preset value → start refilling
ou1 hysteresis function, normally closed (Hnc)
Switching output 2: safety function min - max
SP2 max. value exceeded → alarm
rP2 below min. value → alarm
ou2 window function, normally open (Fno)
FH2
SP1
rP1
FL2
XX.X = display value,
A = refill; B = min. monitoring; C = max. monitoring
• If the level is below rP1, output 1 switches until liquid is refilled. If SP1 is
reached again, output 1 switches off.
• If the level is below FL2 or above FH2 or if there is a wire break, output 2
switches OFF (→ alarm).
• The logical operation between the outputs 1 and 2 indicates whether there is
overflow or the actual level is below the minimum level.
- Overflow: output 1 and output 2 switched off.
- Below min. value: output 1 switched on and output 2 switched off.
More information at www.ifm.com
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