Page 1
Operating instructions
Electronic level sensor
LK31xx
80264298/ 00
06 / 2017
UK
Page 2
2
Contents
1 Preliminary note ................................................................................................... 4
1.1 Symbols used ................................................................................................4
2 Safety instructions ...............................................................................................4
3 Functions and features ........................................................................................5
3.1 Application area ............................................................................................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 ........................................................9
5.2.1 Operating modes ..................................................................................9
5.2.2 Notes on the integrated overflow prevention ...................................... 10
5.3 Display functions .........................................................................................10
5.4 Analogue functions ...................................................................................... 11
5.4.1 Curve of the analogue signal with overflow prevention: ..................... 11
5.4.2 Curve of the analogue signal without overflow prevention .................13
5.5 Switching functions ...................................................................................... 14
5.6 Offset for indicating the real level in the tank ............................................... 15
5.7 Defined state in case of a fault ....................................................................15
5.8 IO-Link .........................................................................................................15
6 Mounting ............................................................................................................ 16
6.1 Installation instructions for operation with overflow prevention ..................17
6.2 Installation instructions for operation without overflow prevention ..............18
6.2.1 Installation in the inactive zone ...........................................................18
6.2.2 Installation in the active zone .............................................................19
6.3 Other installation notes ............................................................................... 20
6.3.1 Marking of the installation height .......................................................20
7 Electrical connection .......................................................................................... 21
8 Operating and display elements ........................................................................22
9 Menu .................................................................................................................. 23
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9.1 Menu structure ............................................................................................. 23
10 Parameter setting ............................................................................................24
10.1 Parameter setting in general .....................................................................24
10.2 Basic settings ...........................................................................................25
10.2.1 Set unit of measurement [uni] ...........................................................25
10.2.2 Set offset [OFS] ................................................................................25
10.2.3 Set medium [MEdI] ...........................................................................25
10.2.4 Set overflow prevention [OP] .......................................................... 26
10.2.5 Adjust overflow prevention [cOP] ......................................................26
10.3 Set output signals ......................................................................................28
10.3.1 Set output function [ou1] for OUT1 (switching output) ......................28
10.3.2 Set output function [ou2] for OUT2 (analogue output) ......................28
10.3.3 Define switching limits [SP1] / [rp1] (hysteresis function) ................. 28
10.3.4 Define switching limits [FH1] / [FL1] (window function) ....................28
10.3.5 Set switching delay [dS1] for switching output .................................29
10.3.6 Set switch-off delay [dr1] for switching output ..................................29
10.3.7 Define switching logic [P-n] for switching output ..............................29
10.3.8 Define response of the outputs in case of a fault [FOUx] ................. 29
10.3.9 Configure display [diS] ......................................................................29
10.3.10 Reset all parameters to factory settings [rES] ................................29
11 Operation .........................................................................................................30
11.1 Operating indicators ................................................................................... 30
11.2 Read set parameters .................................................................................30
11.3 Error indications ......................................................................................... 31
11.4 Output response in different operating states ............................................31
12 Technical data .................................................................................................. 32
12.1 Setting values [OFS] .................................................................................. 32
12.2 Setting values [OP] .................................................................................... 32
12.3 Calculation aids [OP] .................................................................................33
12.3.1 Definition “from the cover“ ................................................................33
12.3.2 Definition “from the bottom“ ..............................................................34
12.4 Setting ranges switching limits for level ..................................................... 34
13 Maintenance / cleaning / change of medium ..................................................34
13.1 Maintenance information for operation without overflow prevention .........35
14 Factory setting .................................................................................................36
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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. That is why installation, electrical
connection, set-up, operation and maintenance of the unit must only be carried
out by qualified personnel authorised by the machine operator.
• In order to guarantee the correct condition of the device for the operating time it
is necessary to use the device only for media to which the wetted materials are
sufficiently resistant (→ Technical data).
• The responsibility whether the device is suitable for the respective application
lies with the operator. The manufacturer assumes no liability for consequences
of misuse by the operator.
• Improper installation and use of the unit 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 Application area
The unit was especially designed to meet the requirements of machine tool
building. It is particularly 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. adhesive, 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.
► Check 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 (→ 5.2.1):
For media which are very inhomogeneous, separate from each other thus
forming separation layers (e.g. oil layer on water), the following applies:
► Check 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 to each
separately described case.
4.1 Example configuration 1
Unit: LK3122 (probe length L= 264 mm)
Medium to be detected: Mineral oil
Operating mode: Manual media selection with overflow prevention
(factory setting) → 5.2.1
Installation environment: Metal tank, installation to fig. 4-1
► Install unit.
► 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 (→ 5.6)
- [OP] = Set overflow prevention 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.
► Adjust overflow prevention 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
Unit: LK3123 (probe length L= 472 mm)
Medium to be detected: Coolant emulsion
Operating mode: Automatic medium detection (→ 5.2.1)
Installation environment: Metal tank, installation to fig. 4-2.
► Install unit.
► Observe the distances (x), (u) and (c).
x: min. 4.0 cm
u: min. 1.0 cm
c: max. 23.0 cm
► Ground sensor and tank via an electrical
connection (→ 7).
► Observe the maximum permitted 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 cm (→ 5.6)
- [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 prevention
(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
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5.2 Operating principle / features of the unit
The unit can be installed in tanks of different sizes. Mounting elements may also
be placed in the active measurement zone. Observe the notes on installation.
2 outputs are available. They can be set separately.
OUT1 Switching signal for level limit value / IO-Link
OUT2 Analogue signal proportional to level (invertible)
To adapt to the present application select the required operating mode.
5.2.1 Operating modes
1. Manual media selection with overflow prevention (factory setting)
Recommended: highest operational reliability!
The medium to be detected is set manually [MEdI]. In addition, an integrated,
independently functioning overflow prevention is available.
2. Manual media selection without overflow prevention
Medium operational reliability!
The medium to be detected is set manually as described under 1. However,
the overflow prevention is deactivated. For this reason, no adjustment is
required.
3. Automatic medium detection
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 prevention is available
Automatic media detection can only function properly under certain
conditions (e.g. compliance with special mounting specifications,
restrictions for operation and maintenance).
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5.2.2 Notes on the integrated overflow prevention
With the parameter [OP] (OP = overflow prevention), one of the upper measuring
segments is defined as integrated overflow prevention OP.
• If the overflow prevention OP is activated, an adjustment to the installation
situation has to be made [cOP].
• The overflow prevention OP can be deactivated ([OP] = [OFF]).
Deactivating the overflow prevention can impair the operational reliability.
For optimum operation and maximum operational reliability, we therefore
recommend to not deactivate the overflow prevention OP.
• The overflow prevention OP is the maximum limit of the measuring range. The
switch point [SP1] / [FH1] is always below [OP].
• The overflow prevention OP is not assigned to a separate output. It offers
additional protection and only switches if as the level rises the switching
output has not switched even though the corresponding switch point has been
exceeded (e.g. due to application-related malfunctions).
• Typically the overflow prevention OP reacts when the selected measuring
segment has been reached (a few mm before the set OP value).
• The overflow prevention OP reacts immediately and without delay. The set
delay times (e.g. of a switch point directly below) have no effect on the overflow
prevention OP.
• The response of the overflow prevention OP is indicated on the display ("Full"
and indication of the current level change every second).
5.3 Display 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 switching output are indicated by LEDs.
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5.4 Analogue functions
The unit provides an analogue signal proportional to level. The analogue output
(OUT2) can be configured:
• [ou2] defines the output function of the analogue output: mA / V (→ 10.3.2).
• In case of an internal fault, the output signal reacts according to the parameters
set in [FOU2] (→ 10.3.8).
5.4.1 Curve of the analogue signal with overflow prevention:
[OP] = [value ...] (overflow prevention OP activated)
[ou2] = [I] or [U]
Fig. 5-2 Fig. 5-3
OP positioned in the upper segment. OP shifted downward.
I [mA] / U [V]
L
20 / 10
4 / 0
A
OP
I [mA] / U [V]
L
20 / 10
4 / 0
A
OP
A: Active zone OP: Measuring segment overflow prevention OP L: Level
The measuring range is limited by the active measuring segment OP. If the level
reaches the measuring segment OP, the output signal jumps to its maximum value
(20 mA / 10 V).
The position of the measuring segment OP does not have any influence on
the gradient of the curve.
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[OP] = [value ...] (overflow prevention OP activated)
[ou2] = [InEG] or [UnEG]
Fig. 5-4 Fig. 5-5
OP positioned in the upper segment. OP shifted downward.
I [mA] / U [V]
L
20 / 10
4 / 0
A
OP
I [mA] / U [V]
L
20 / 10
4 / 0
A
OP
A: Active zone OP: Measuring segment overflow prevention OP L: Level
The measuring range is limited by the active measuring segment OP. If the level
reaches the measuring segment OP, the output signal jumps to its minimum value
(4 mA / 0 V).
The position of the measuring segment OP does not have any influence on
the gradient of the curve.
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5.4.2 Curve of the analogue signal without overflow prevention
[MEdI] = [Auto] or [OP] = [OFF] (overflow prevention OP deactivated)
Fig. 5-6 Fig. 5-7
[ou2] = [I] or [U] [ou2] = [InEG] or [UnEG]
I [mA] / U [V]
L
A
20 / 10
4 / 0
I [mA] / U [V]
I [mA] / U [V]
L
A
20 / 10
4 / 0
I [mA] / U [V]
A: Active zone L: Level
[MEdI] = [Auto] or [OP] = [OFF]:
Operating mode with the lowest operational reliability (→ 5.2.1).
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5.5 Switching functions
The unit signals via the switching output OUT1 that a set limit value has been
exceeded or that the level is below the limit value.
Selectable switching functions:
• Hysteresis function / normally open (fig. 5-8): [ou1] = [Hno].
• Hysteresis function / normally closed (fig. 5-8): [ou1] = [Hnc].
First the set point [SP1] is set, then the reset point [rP1] with the required
difference.
The hysteresis for the overflow prevention OP is fixed.
• Window function / normally open (fig. 5-9): [ou1] = [Fno].
• Window function / normally closed (fig. 5-9): [ou1] = [Fnc].
The width of the window can be set by means of the difference between
[FH1] and [FL1]. [FH1] = upper value, [FL1] = lower value.
Fig. 5-8 Fig. 5-9
SP
rP
t
L
FH
FL
1
0
1
0
FE
Fno
Fnc
L:
HY:
FE:
Level
Hysteresis
Window
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5.6 Offset for indicating the real level in the tank
The distance between tank bottom and lower edge of the measuring probe can be
entered as offset value [OFS]. So display and switch points refer to the actual level
(point of reference = tank bottom).
For [OFS] = [0]: The reference point is the lower edge of the measuring
probe.
The set offset only refers to the display on the unit. It does not have any
effect on the analogue output and the process value transmitted via IOLink. The OFS parameter, however, is correctly transmitted via IO-Link and
can therefore be taken into account.
More information → 5.8.
5.7 Defined state in case of a fault
In case of a fault a 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] (→ 10.3.8).
5.8 IO-Link
This unit has an IO-Link communication interface which requires an IO-Linkcapable module (IO-Link master) for operation.
The IO-Link interface enables direct access to the process and diagnostic data
and provides the possibility to set the parameters of the unit during operation.
In addition communication is possible via a point-to-point connection with a USB
adapter cable.
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 can be
found at www.ifm.com.
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6 Mounting
Fig. 6-1
OP
c
L:
M:
c:
Probe length
Zone for mounting elements
Maximum outside length
u ... y:
OP:
B:
Minimum distances
Overflow prevention
Metal object inside the tank
Table 6-1
LK3122 LK3123 LK3124
[cm] [inch] [cm] [inch] [cm] [inch]
L (probe 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 was neglected;
mounting element does not protrude inside the tank).
Otherwise note mounting zone M.
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6.1 Installation instructions for operation with overflow
prevention
[MEdI] = [CLW..] or [OIL..]
[OP] = [value ...] (overflow prevention OP activated)
It is permitted to fix the mounting elements within the mounting zone (M)
(fig. 6-1).
► Observe the maximum permitted outside 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 prevention.
The overflow prevention (OP) must:
1. be below the mounting element
2. be set at a minimum distance (y) to it.
The minimum distance is 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 (LK3122) 2.5 1.0 3.5 1.4 4.5 1.8
y (LK3123) 4.5 1.8 5.5 2.2 6.5 2.6
y (LK3124) 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
prevention
[MEdI] = [Auto] or [OP] = [OFF] (overflow prevention OP deactivated)
6.2.1 Installation in the inactive zone
Between the maximum level (b1) and the inactive zone (I1), the minimum
distance (a1) must be adhered to (fig. 6-2 and table 6-3).
► Fix the unit using mounting elements
in the inactive zone (I1). The outside
length (c) must not exceed (I1) (table
6-3).
► Ensure that the maximum level (b1)
is not exceeded after completed
installation (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 (b1)
b1: Max. level from the lower edge of the
sensor (without offset)
c: Max. permitted outside length
(observe footnote table 6-1)
Table 6-3
LK3122 LK3123 LK3124
[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
Between the maximum level (b2) and the mounting element the minimum
distance (a2) must be adhered to (fig. 6.3 and table 6-4).
► Fix mounting elements in the mounting
zone (M) (fig. 6-1). Adhere to the
maximum permitted outside length (c)
(table 6-1 ).
► Ensure that the maximum level (b2)
is not exceeded after completed
installation:
(b2) = (L) - (c) - (a2) (without offset)
► Observe further minimum distances
according to table 6-4.
Fig. 6-3
cb2
L
u a2
x
c: Maximum permitted outside length
(observe footnote table 6-1)
a2: Minimum distance between mounting
element and maximum level (b2).
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 (LK3122) 2.0 0.8 2.5 1.0 3.0 1.2
a2 (LK3123) 4.0 1.6 4.5 1.8 5.0 2.0
a2 (LK3124) 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 [MEdI] = [Auto] or deactivated
overflow prevention [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 must not be completely
covered by the medium. The indicated minimum distances ensure this.
Too short a distance may lead to maladjustments and malfunctions.
6.3 Other installation notes
• For mounting in plastic pipes/plastic tanks, the inside diameter must at least be
12 cm (4.8 inches). 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
6.3.1 Marking of 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 for the correct function of the
overflow prevention OP.
► Fit the stainless steel tube clip using pliers.
► Ensure a safe fit.
► To remove the clip it has to be destroyed.
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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: analogue output
Colours to DIN EN 60947-5-2
Example circuits
1 x positive switching / 1 x analogue 1 x negative switching / 1 x analogue
L
L
+
3
4
2
1
BU
BK
WH
BN
2: OUT 2
4: OUT 1
L
L
+
3
4
1
BU
BK
BN
2: OUT 2
4: OUT 1
2
WH
For a reliable function, the sensor housing must
be electrically connected to the counter-electrode
(grounding).
► Use the housing connection (see drawing) and
a short piece of cable with a wire cross section
of min. 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 sensor 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 inches.
LEDS 3 - 7 Not used.
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
once).
11: Alphanumeric display, 4 digits
- Indication of the current level.
- Indication of the parameters and parameter values.
- Operation 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
S
20.0 10.0
8.0
rP1 FL1
MEdl CLW.1
OP
20.4
cOP
EF
donE
S
S
S
S
M
M
rES
S
M
M
M
M
M
M
M
M
S
- - - -
ou1
Hnc
0.0
ou2
dS1
dr1 0.0
S
S
S
M
I
M
M
M
M
M
uni
P-n
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
19.5 9.5
cOP
RUN
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] 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 becomes
effective.
4
Change more parameters:
► Start again with step 1.
Finish 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 finished.
*) 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).
Lock / unlock: 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 configured before or after installation.
Exception: To adjust the overflow prevention [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 Set unit of measurement [uni]
► Enter [uni] before entering the values SPx, rPx, OP or OFS.
This avoids unintentional wrong settings.
► Select [uni]
► Determine unit of measurement: [cm] or [inch]
uni
10.2.2 Set offset [OFS]
The distance between tank bottom and lower edge of the measuring probe can be
entered as offset value (→ 5.6).
► Set [OFS] before the values for SP1, rP1 or OP are entered.
This avoids unintentional wrong settings.
► Select [OFS].
► Set the value for the offset. Note the set unit of measurement [uni].
OFS
10.2.3 Set medium [MEdI]
► Select [MEdI]
► Set sensitivity matching the medium to be detected:
MEdI
[CLW.1] = water, hydrous media, coolant emulsions.
[CLW.2] = water, hydrous media, coolant emulsions for temperatures >
35 °C (installation in climatic tube).
[OIL.1] = oils with an increased dielectric constant (e.g. some synthetic
oils).
[OIL.2] = oils with a low dielectric constant (e.g. mineral oils).
[Auto] = automatic medium detection.
► In case of doubt, select [OIL.2] for oils.
► Check proper functioning in 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 prevention is available. In that case,
the menu points [OP] and [cOP] are not available.
10.2.4 Set overflow prevention [OP]
► Comply with minimum distances and installation instructions.
► Select [OP].
► Define the position of the overflow prevention OP.
The option [OP] = [OFF] deactivates the overflow prevention OP.
OP
► Set [OP] before [SP1] or [FH1].
> If [OP] is reduced to a value ≤ [SP1] / [FH1] after setting [SP1] / [FH1],
[SP1] / [FH1] shifts downwards.
> If [OP] is increased, [SP1] / [FH1] also increases if [OP] and
[SP1] / [FH1] are close together (1 x step increment).
If the overflow prevention is deactivated [OP] = [OFF] or [MedI] = [Auto], the
reliable function of the sensor must be verified with particular care. Switchon 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 Adjust overflow prevention [cOP]
Only adjust the overflow prevention OP when the unit is installed.
If possible, carry out the adjustment when the tank is empty.
The tank may be partly filled.
► Make sure that the overflow prevention OP is not covered by the
medium. Observe the minimum distance between the overflow
prevention 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.
► If necessary, lower the level or correct the position of the overflow
prevention [OP] and repeat the adjustment operation.
cOP
Minimum distance between the overflow prevention OP and the level during
adjustment:
Table 10-1
[cm] [inch]
LK3122 2.0 0.8
LK3123 3.5 1.4
LK3124 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.
When the overflow prevention is activated ([OP] = [value ...]), an
adjustment [cOP] must be carried out each time:
• [MEdI] or [OP] was changed. In this case appears in the display.
• The installation position (height, orientation) was changed.
• The connection between the sensor and the tank ground (e.g. cable
length) was changed.
With deactivated overflow prevention [MEdI] = [Auto] or [OP] = [OFF] it is
necessary for the unit for applying the basic settings and adaptation to the
medium and installation environment:
1. to be installed in the application
2. to be reinitialised.
► Switch the operating voltage off and on again.
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10.3 Set output signals
10.3.1 Set output function [ou1] for OUT1 (switching output)
► Select [ou1] and set the switching function:
ou1
[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 prevention, the setting
[ou1] = [Hnc] (normally closed function) is recommended. The principle of
normally closed operation ensures that wire break or cable break is also
detected.
10.3.2 Set output function [ou2] for OUT2 (analogue output)
► Select [ou2] and set the output function:
ou2
[I] = current output 4...20 mA
[U] = voltage output 0...10 V
[InEG] = current output 20...4 mA (inverted)
[UnEG] = voltage output 10...0 V (inverted)
10.3.3 Define switching limits [SP1] / [rp1] (hysteresis function)
► Make sure that the function [Hno] or [Hnc] is set for [ou1].
► First set [SP1], then [rP1].
► Select [SP1] and set the value at which the output switches.
SP1
► Select [rP1] and set the value at which the output is reset.
rP1
[rP1] is always lower than [SP1]. The unit only accepts values which are lower than [SP1].
If [SP1] is shifted, [rP1] also shifts provided that the lower end of the setting range is not
reached.
10.3.4 Define switching limits [FH1] / [FL1] (window function)
► Make sure that for [ou1] the function [Fno] or [Fnc] is set.
► First set [FH1], then [FL1].
► Select [FH1] and set the upper limit of the acceptable range.
FH1
► Select [FL1] and set the lower limit of the acceptable range.
FL1
[FL1] is always lower than [FH1]. The unit only accepts values which are lower than the
value for [FH1]. If [FH1] is shifted, [FL1] also shifts provided that the lower end of the setting
range is not reached.
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10.3.5 Set switching delay [dS1] for switching output
► Select [dS1] and set the value between 0.0 and 60 s.
The switching delay reacts according to VDMA.
dS1
10.3.6 Set switch-off delay [dr1] for switching output
► Select [dr1] and set the value between 0.0 and 60 s.
The switching delay reacts according to VDMA.
dr1
10.3.7 Define switching logic [P-n] for switching output
► Select [P-n] and set [PnP] or [nPn].
P-n
10.3.8 Define response of the outputs in case of a fault [FOUx]
► Select [FOUx] and set value:
FOU1
FOU2
[On] = Output switches ON in case of a fault.
Analogue output switches on > 21 mA / 10 V in case of a fault.
[OFF] = Output switches OFF in case of a fault.
Analogue output switches on < 3.6 mA / 0 V in case of a fault.
A fault is for example: defective hardware, too low a signal quality. Overflow
is not considered to be a fault (→ 11.3).
10.3.9 Configure display [diS]
► Select [diS] and set 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.
10.3.10 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 power on, 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
Table 11-1
[----] (continuous) Initialisation phase after power on.
[numerical value] + LED 1 Current level in cm.
[numerical value] + LED 2 Current level in inch.
LED 8 Switching status OUT1 (lights when output 1 is switched).
[----] Level below the active zone.
[FULL] + [numerical value]
alternately
The overflow prevention OP is reached (overflow warning) or
the level is above the active zone.
Adjustment [cOP] of the overflow prevention OP necessary.
[Loc] Unit locked via buttons; parameter setting is not possible.
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 set parameters
► Briefly press [Mode/Enter] (if required, repeat several times).
> Menu structure is scrolled until the required parameter has been reached.
► Briefly press [Set].
> Respective parameter value is displayed for 30 s.
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11.3 Error indications
Table 11-2
Possible cause Recommended measures
[Err] Fault in the electronics. ► Replace the unit.
[SEnS]
• Interfering sources (e.g. EMC)
• Poor cables
• Supply voltage disturbed
► Check electrical connection.
► Check connection between the
sensor and the tank ground.
[FAIL]
Error during adjustment of the
overflow prevention OP:
• Overflow prevention covered by
the medium during adjustment.
• Overflow prevention soiled.
• Minimum distances too short
• Mounting element detected
below the overflow prevention.
• Measured value not constant.
► Lower the level, if possible.
► Clean the probe.
► Observe the notes on installation.
► Correct the position of the overflow
prevention OP.
► Repeat the adjustment.
► Deactivate OP (→ 5.2.1)
[SC1] + LED 8
Flashing: short circuit in
switching output
OUT1.
► Remove the short circuit.
[PArA] Faulty data set. ► Reset to factory settings [rES].
11.4 Output response in different operating states
Table 11-3
OUT1 OUT2*
Initialisation phase OFF 0 mA
Overflow prevention OP
not adjusted
OFF 3.5 mA
Overflow prevention OP
adjusted or deactivated,
normal operation
according to process value
and
[ou1] setting
according to process value
4...20 mA
Fault
OFF with [FOU1] = [OFF]
ON with [FOU1] = [On]
< 3.6 mA with [FOU2] = [OFF]
> 21 mA with [FOU2] = [On]
* If the output function [ou2] = [I] has been selected
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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
LK3122
LK3123
LK3124
LK3122
LK3123
LK3124
Step increment 0.5 1 0.2 0.5
12.2 Setting values [OP]
Table 12-2
OPx
LK3122 LK3123 LK3124
[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].
With [OFS] > [0] the values increase by the set OFS value.
Example LK3122: According to table 12-2 OP is set to segment 20.4 cm.
[OFS] = 7.0 cm
[OP] is set to 20.4 cm + 7.0 cm = 27.4 cm.
12.3 Calculation aids [OP]
For proper functioning of the overflow prevention OP the 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 L: probe length
c: outside length
(maximum → 6)
u: distance between probe and tank
bottom
y: required response level OP
from the cover (minimum →
6.1, maximum → 12.2).
z: required response level OP from the
bottom (maximum: z < L - c - y or
z < B - y).
12.3.1 Definition “from the cover“
Required distance (y) of the overflow prevention OP
“from the cover“ is defined.
• Without offset ([OFS] = [0]): [OP] = L - c - y
• With offset ([OFS] = u):
Example LK3122:
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. 6-3
OP
c
z
B
L
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12.3.2 Definition “from the bottom“
Response level (z) of the overflow prevention 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 → 12.2.
12.4 Setting ranges switching limits for level
Table 12-3
LK3122 LK3123 LK3124
[cm] [inch] [cm] [inch] [cm] [inch]
[SP1] / [FH1] 2.5...20.0 1.0...8.0 3.5...39.0 1.4...15.4 6...59 2.5...23.5
[rP1] / [FL1] 2.0...19.5 0.8...7.8 3.0...38.5 1.2...15.2 5...58 2.0...23.0
Step
increment
0.5 0.2 0.5 0.2 1 0.5
The values apply if [OFS] = [0].
If OFS > 0 they increase by the set OFS value.
Example: [SP1] = 20.0 cm
[OFS] = 7.0 cm
Value displayed when the switch point is reached:
display = 20.0 cm + 7.0 cm = 27.0 cm
13 Maintenance / cleaning / change of medium
When removing or installing the unit for maintenance and cleaning:
► 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.
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13.1 Maintenance information for operation without overflow
prevention
[MEdI] = [Auto] or [OP] = [OFF] (overflow prevention OP 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 was removed from the tank and then installed again during
operation.
• If the active zone of the sensor was 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 was
changed.
• After a change of the medium with considerably differing dielectric constants.
For manual selection of media, first the [MEdI] setting needs to be adjusted.
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14 Factory setting
Factory setting User setting
LK3122 LK3123 LK3124
SP1 20.0 39.0 59
rP1 19.5 38.5 58
OP
20.4 40.7
61
MEdI CLW.1
cOP ---rES ---ou1 Hnc
ou2 I
dS1 0.0
dr1 0.0
uni cm
P-n PnP
OFS 0
FOU1 OFF
FOU2 OFF
diS On
More information at www.ifm.com
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