IFM Electronic LK8122 Bedienungsanleitung

Operating instructions

Electronic level sensor

LK81xx

80264351 / 00 06 / 2017

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 prevention ........................................9

5.2.3 Display and switching functions..........................................................10

5.2.4 Offset for indicating 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 .........................................................................................................13

6.1 Notes on installation instructions for operation with overflow prevention ...14

6.2 Installation instructions for operation without overflow prevention ..............15

6.2.1 Installation in the inactive zone...........................................................15

6.2.2 Installation in the active zone .............................................................16

6.3 Further notes on installation / accessories ..................................................17

6.3.1 Marking of the installation height ........................................................17

7 Electrical connection..........................................................................................18

8 Operating and display elements ........................................................................20

9 Menu..................................................................................................................21

9.1 Menu............................................................................................................21

10 Parameter setting ............................................................................................22

10.1 Parameter setting in general .....................................................................22

10.2 Basic settings ...........................................................................................23

10.2.1 Setting the unit of measurement [uni]...............................................23

10.2.2 Set the offset [OFS] ..........................................................................23

10.2.3 Set the medium [MEdI] .....................................................................24

10.2.4 Set the overflow prevention [OP] ....................................................24

10.2.5 Adjust the overflow prevention [cOP]................................................25

10.3 Setting of output signals ............................................................................26

10.3.1 Set output function [oux] for OUTx ..................................................26

10.3.2 Define the switching limits [SPx] / [rPx] (hysteresis function) ...........26

10.3.3 Define switching limits [FHx] / [FLx] (window function).....................27

10.3.4 Set the switching delays [dSx] for switching outputs ........................27

10.3.5 Set the switch-off delay [drx] for switching outputs...........................27

10.3.6 Define the switching logic [P-n] for the outputs ................................27

10.3.7 Define response of the outputs in case of a fault [FOUx] .................27

10.3.8 Configure display [diS]......................................................................28

10.3.9 Reset all parameters to factory settings [rES] ..................................28

11 Operation .........................................................................................................29

11.1 Operating indicators...................................................................................29

11.2 Read the set parameters ...........................................................................29

11.3 Error indications.........................................................................................30

11.4 Output response in different operating states ............................................30

12 Technical data..................................................................................................30

12.1 Setting values [OFS]..................................................................................31

12.2 Setting values [OP]....................................................................................31

12.3 Calculation aids [OP] .................................................................................32

12.3.1 Definition "from the cover“ ................................................................32

12.3.2 Definition "from the bottom"..............................................................32

12.4 Setting ranges [SPx] / [FHx] and [rPx] / [FLx] ...........................................33

13 Maintenance / cleaning / change of medium ..................................................34

13.1 Maintenance information for operation without overflow prevention .........34

14 Factory setting .................................................................................................35

15 Applications......................................................................................................36

15.1 Storage tank ..............................................................................................36

15.2 Pumping station.........................................................................................38

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.

CAUTION

Warning of personal injury.

Slight reversible injuries may result.

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).

• It is the operator's responsibility to verify whether the device is suitable for the

respective application. The manufacturer assumes no liability for consequences

of misuse by the operator.

• Improper installation and use of the device 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.

• The surface of the unit may get hot if the switching outputs are operated at

maximum load. There is a risk of burns.

3 Functions and features

3.1 Applications

The unit was especially designed to meet the requirements of machine tool

building. It is especially 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 (→ 5.2.1):

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.

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 LK8122 (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

Fig. 4-1

►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 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].

Step increment and setting range: (→ 12.1).

Calculation aids for [OP]: (→ 12.3).

►Adjustment of the 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.

4.2 Example configuration 2

Unit LK8123 (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 (→ 5.2.4)

- [SP1] = Set the switch point at a distance (a2)

Fig. 4-2

bu a2

Adjustable step increment: 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.

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

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. Observe the notes on

installation.

4 outputs are available. They can be set separately.

OUT1 Switching signal for level limit value / IO-Link

OUT2

OUT3

OUT4

Switching signal for level limit value

To adjust the unit to the application, it provides the following operating modes:

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).

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.

• 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 OP 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 points [SPx] / [FHx] are 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 replies 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).

5.2.3 Display and switching functions

The unit displays the current level, selectable in cm or inches. The set unit of

measurement and the switching status of the outputs are indicated by LEDs.

The unit signals via four switching outputs (OUT1...OUT4) 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 overflow prevention 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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