IFM Electronic LK1022, LK7022, LK1023, LK7023, LK7024 Operating Instructions Manual
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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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