IFM Electronic LK3122, LK3123, LK3124 Operating Instructions Manual
Operating instructions
Electronic level sensor
LK31xx
80264298/ 00
06 / 2017
UK
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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 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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