Ifm Lk122 series User manual

Operating instructions

Electronic level sensor

LK122x

80260475/ 00 01 / 2017

UK

2

Contents

1 Preliminary note��4

1�1 Symbols used ��4

2 Safety instructions ��4

3 Items supplied��5

4 Functions and features ��5

4�1 Applications ��5

4�2 Restriction of the application area ��6

5 Getting started ��6

5�1 Example configuration ��7

6 Function��8

6�1 Measuring principle ��8

6�2 Operating principle / features of the unit��9

6�2�1 Notes on the integrated overflow prevention ��9

6�2�2 Display and switching functions��10

6�2�3 Offset for indicating the real level in the tank�� 11

6�2�4 Defined state in case of a fault �� 11

6�2�5 IO-Link function �� 11

6�3 Password protection against inadvertent manipulation ��12

7 Installation��12

7�1 Other installation notes��14

7�1�1 Marking of the installation height ��14

8 Electrical connection��15

9 Operating and display elements ��16

10 Menu��17

10�1 Menu structure��17

10�2 Password protection ��18

11 Parameter setting��18

11�1 Parameter setting in general��18

11�2 Basic settings ��19

11�2�1 Set unit of measurement [uni]��19

11�2�2 Set offset [OFS] ��19

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11�2�3 Set medium [MEdI] ��20

11�2�4 Set overflow prevention [OP] ��20

11�2�5 Adjust the overflow prevention [cOP]��21

11�3 Setting the output signals for OUT1��22

11�3�1 Setting the output function [ou1] ��22

11�3�2 Define switching limits [SP1] / [rp1] (hysteresis function) ��22

11�3�3 Define switching limits [FH1] / [FL1] (window function) ��22

11�3�4 Set switch-on delay [dS1] ��22

11�3�5 Set switch-off delay [dr1]��23

11�3�6 Define switching logic [P-n]��23

11�3�7 Set response of the output in case of a fault [FOU1]��23

11�3�8 Configure display [diS]��23

11�3�9 Reset all parameters to factory setting [rES] ��23

11�4 Changing the password [CodE] ��24

11�5 Enter password [KEy�C] ��24

12 Operation��24

12�1 Operation indication��25

12�2 Read the set parameters ��25

12�3 Error indications��26

12�4 Output response in different operating states��27

13 Technical data��27

13�1 Setting values [OFS]��27

13�2 Setting values [OP]��28

13�3 Calculation aids [OP] ��29

13�3�1 Definition "from the cover“ ��29

13�3�2 Definition "from the bottom"��30

13�4 Setting ranges [SP1] / [FH1] and [rP1] / [FL1] ��30

14 Maintenance/cleaning/change of medium ��31

15 Factory setting ��31

4

1 Preliminary note

Technical data, approvals, accessories and further information at www�ifm�com�

1.1 Symbols used

►Instructions

> Reaction or 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

• Read this document before setting up the product and keep it during the entire

service life�

• The product must be suitable for the corresponding applications and environ-

mental conditions without any restrictions�

• Only use the product for its intended purpose (→ Functions and features).

• Only use the product for permissible media (→ Technical data).

• If the operating instructions or the technical data are not adhered to, personal

injury and/or damage to property can occur�

• The manufacturer assumes no liability or warranty for any consequences

caused by tampering with the product or incorrect use by the operator�

• Installation, electrical connection, set-up, operation and maintenance of the

product must be carried out by qualified personnel authorised by the machine

operator�

• The unit and the accessories (e�g� cable) must be effectively protected against

damage�

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UK

3 Items supplied

• 1 LK122x sensor

• 1 operating instructions

• 1 stainless steel tube clip (for fixing the installation height)

In addition, the following may be necessary for installation and operation:

• 1 climatic tube (for operation of the unit with aqueous media of temperatures

> 35 °C)� The climatic tube restricts the application area of the unit (→ 4.2)�

►In the event of incomplete or damaged items supplied please contact ifm

electronic�

►Only use accessories from ifm electronic�

Accessories: www�ifm�com

The optimum function is not ensured when using components from other

manufacturers�

4 Functions and features

4.1 Applications

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�

The unit has a building authority approval according to the German

Federal Water Act (WHG)�

When used as overflow prevention according to the German Federal Wa-

ter Act (WHG), observe the Technical description� → www�ifm�com

6

4.2 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 and 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 function by an application test�

• For water-based media with temperatures > 35 °C install the unit in a climatic

tube (accessories)�

►Check proper function by an application test�

When used as overflow prevention according to the German Federal

Water Act (WHG), no climatic tube must be used�

5 Getting started

For fast set-up, the example configuration described in the following can be used

for most applications� The indicated minimum distances apply exclusively to the

described case�

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5.1 Example configuration

Unit: LK1222 (probe length L= 264 mm)

Medium to be detected: Mineral oil

Installation environment: Metal tank, installation to fig� 5-1

►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 connec-

tion (→ 8)�

►Observe the parameter setting sequence:

- [MEdI] = [OIL�2] → 11.2.3

- [OFS] = (u); e�g� (u) = 2�0 cm (→ 6.2.3)

- [OP]: Set the overflow prevention OP at a dis-

tance (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. 5-1

OP

c

Step increment and setting range: → 13.2

Calculation aids for [OP]: → 13.3

►Adjust overflow prevention OP to [cOP] → 11.2.5

>The unit is ready for operation.

►Make further settings if necessary�

►Check whether the unit operates correctly�

8

6 Function

6.1 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. 6-1

A II

E

I: Inactive zone

A: Active zone (16 active segments)

E: Electrical field

Dimensions → Technical data sheet

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6.2 Operating principle / features of the unit

The unit can be flexibly installed in tanks of different sizes�

2 outputs are available:

OUT1 Switching signal for level limit value/IO-Link

OUT-OP Switching signal for level limit value (overflow prevention)

OUT1 can be freely configured, OUT-OP is fixed to NC and has a fixed hysteresis

(a few mm)�

6.2.1 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�

• 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 assigned to the output OUT-OP!

• 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 response of the overflow prevention OP is indicated on the display

("Full" and indication of the current level change every second)�

10

6.2.2 Display and switching functions

The unit displays the current level, selectable in cm or inches� 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, OUT-OP) that a set limit has

been exceeded or that the level is below the limit� The output configuration for the

switching output OUT-OP cannot be configured (see above)� The following output

functions are available for the switching output OUT1:

• Hysteresis function / normally open (fig� 6-2): [ou1] = [Hno]

• Hysteresis function / normally closed (fig� 6-2): [ou1] = [Hnc]

First the switch point [SP1] is set, then the switch-off point [rP1] with the

requested difference�

• Window function / normally open (fig� 6-3): [ou1] = [Fno]

• Window function / normally closed (fig� 6-3): [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. 6-2 Fig. 6-3

SP

rP

t

L

FH

FL

1

0

1

0

FE

Fno

Fnc

L: Level HY: Hysteresis FE: Window

For the output OUT1 a switch-on and switch-off delay of max� 60 s can be set (e�g�

for especially long pump cycles)�

→ 11.3.4 and → 11.3.5

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6.2.3 Offset for indicating the real level in the tank

The zone 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 (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 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 account

(→ 6.2.5)�

6.2.4 Defined state in case of a fault

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 output OUT1 can be

set via the parameter [FOU1] (→ 11.3.7)�

The response of the output OUT-OP (overflow prevention) is fixed:

it opens in case of a fault�

6.2.5 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 while it is in operation�

Operation of the unit via an IO-Link interface requires an IO-Link capable module

(IO-Link master)�

With a PC, suitable IO-Link software and an IO-Link adapter cable communication

is possible when the system is not in operation�

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�

12

6.3 Password protection against inadvertent manipulation

As an option, the sensor can be protected by a password against inadvertent

manipulation and unauthorised changes�

Password on delivery: Not activated!

For activation/deactivation (→ 11.4)

7 Installation

Fig. 7-1

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 7-1

LK1222 LK1223 LK1224

[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� outside 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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It is permitted to fix the mounting elements within the mounting zone (M)

(fig� 7-1)�

►Adhere to the maximum permitted outside length (c) according to table 7-1�

►Observe the minimum distances according to fig� 7-1 and table 7-2�

►Observe the notes on the integrated overflow prevention OP�

The overflow prevention OP must:

1� be below the mounting element and

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 7-2

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 (LK1222) 2�5 1�0 3�5 1�4 4�5 1�8

y (LK1223) 4�5 1�8 5�5 2�2 6�5 2�6

y (LK1224) 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]: → 13.3

14

7.1 Other installation notes

• For mounting in plastic pipes/plastic tanks, the inside pipe diameter must at

least be 12�0 cm (4�8 inches)� Install sensor in the centre�

• For mounting in metal pipes the inside pipe diameter (d) must be at least:

Table 7-3

MEdI = CLW�1 MEdI = CLW�2, OIL�1 MEdI = OIL�2

[cm] [inch] [cm] [inch] [cm] [inch]

d 4�0 1�6 6�0 2�4 10�0 4�0

7.1.1 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 main-

tenance 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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8 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

2OUT-OP

L+

L

OUT1

BK Black

BN Brown

BU Blue

WH White

OUT1: Switching output / IO-Link

OUT-OP: Overflow prevention

Colours to DIN EN 60947-5-2

Example circuits

2 x positive switching 2 x negative switching

L

L+

3

4

2

1

BU

BK

WH

BN

2: OUT-OP

4: OUT1

L+

3

4

2

1

BU

BK

WH

BN

2: OUT-OP

4: OUT1 L

For safe function, the sensor housing must be

electrically connected to the counter-electrode

(grounding)�

►For this, use the housing connection (see

drawing) and a short piece of cable with a core

cross-section of at least 1�5 mm2�

When using metal tanks, the tank wall serves as

the counter-electrode�

For plastic tanks, a counter-electrode must be

provided, e�g� a metal plate inside the tank in

parallel with the probe� Adhere to minimum

distances to the probe�

16

9 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 centimetres

LED 2 Indication in inches

LEDs 3 - 6 Not used

LED 7 Switching status OUT-OP (overflow prevention)

LED on: No overflow, overflow prevention point OP not reached

LED off: Tank is full, overflow prevention point OP is reached

LED 8 Switching status OUT1 (on when the output is switched)

9: [Mode/Enter] button

- Selection of the parameters and acknowledgement of the parameter values

10: [Set] button

- Setting of the parameter values (continuously by holding pressed; incrementally by

pressing once)

11: Alphanumeric display, 4 digits

- Indication of the current level

- Display of the parameters and parameter values�

- Display of the operating and fault indication

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10 Menu

10.1 Menu structure

M

FH1 S

M

S

10�0

FL1 9�5

S

M

MEdl CLW�1

S

M

OP 20�4

cOP cOP

S

M

CodE

EF

donE

S

M

nonE

M

S

M

SP1 S

M

S

10�0

rP1 9�5

S

M

8�0

M

rES S

M

S

- - - -

ou1 Hno

0�0

dS1

dr1

uni cm

S

M

0�0

M

P-n PnP

S

M

FOU1

diS

M

OFS 0

S

OFF

On

M

Menu item only visible at factory setting (→ 15)�

Menu item only visible if certain parameters have been selected�

18

10.2 Password protection

If the password protection is activated, the parameter [KEy�C] is displayed upon

opening of the menu� Under this parameter, the password can be entered�

When the password has been entered, there is full write and read access to

all parameters� If no button is pressed for 2 minutes, the password protection

becomes active again�

If no password or a wrong password is entered, there is only read access to the

parameters� Attempts to change parameters are acknowledged by the message

[CodE]�

11 Parameter setting

11.1 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 is effective�

4Change more parameters:

►Start again with step 1�

Finishing the parameter setting:

►Wait for 30 s or press and hold

[Mode/Enter]�

> The current measured value is

displayed�

►Release [Mode/Enter]�

> The parameter setting is finished�

* Decrease the value: Let the display move to the maximum setting value�

Then the cycle starts again at the minimum setting value�

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Timeout: If no button is pressed for 30s during programming, the unit returns to the

operating mode with unchanged values (exception: cOP)�

Locking/unlocking: The unit can be locked electronically to prevent unauthorised setting

(factory setting: not locked)�

►Make sure that the unit is in the normal operating mode�

To lock the unit:

►Press both buttons simultaneously for 10 s�

> [Loc] is displayed�

To unlock the unit:

►Press both buttons simultaneously for 10 s�

> [uLoc] is displayed�

The unit can be configured before or after installation�

Exception: To adjust the overflow prevention [cOP], the unit must be

installed in the tank�

11.2 Basic settings

Setting ranges of all parameters: → 13

Factory settings of all parameters: → 15

11.2.1 Set unit of measurement [uni]

►Enter [uni] before entering the values for SPx, rPx, OP or OFS�

This avoids unintentional wrong settings�

►Select [uni]

►Determine unit of measurement: [cm], [inch]

uni

11.2.2 Set offset [OFS]

The zone between tank bottom and lower edge of the measuring probe can be

entered as offset value (→ 6.2.3)�

►Set [OFS] before entering the values for SPx, rPx or OP�

This avoids unintentional wrong settings�

►Select [OFS]�

►Set the value for the offset� Note the set unit of measurement [uni]�

OFS

20

11.2.3 Set medium [MEdI]

►Select [MEdI] and set the corresponding sensitivity:

MEdI

[CLW�1] = Water, water-based media, coolant emulsions

[CLW�2] = Water, water-based media, coolant emulsions at temperatures

> 35 °C (installation in climatic tube)�

Restricted application area of the unit with climatic tube (→ 4.2)

[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)

►In case of doubt, select [OIL�2] for oils�

►Check proper function by an application test!

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�

11.2.4 Set overflow prevention [OP]

►Comply with minimum distances and installation instructions�

►Select [OP]�

►Define the position of 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)�

IFM LK122 Series User manual

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