IFM Electronic LK7 Bedienungsanleitung

Operating instructions

Electronic level sensor

LK7 / LK0

701593/07 04/2006

Contents

1 Menu structure ��3

2 Controls and visual indication ��4

3 Function and features ��4

3�1 Measuring range ��5

3�2 Offset ��5

3�3 Applications ��6

4 Operating modes ��6

4�1 Run mode ��6

4�2 Display mode ��6

4�3 Programming mode ��7

5 Installation��7

5�1 Mounting elements ��7

5�2 Mounting recommendation ��7

5�3 Special mounting conditions ��8

5�4 Mounting accessories ��8

6 Electrical connection ��9

7 Programming ��10

8 Installation and set-up / operation�� 11

8�1 Display during operation �� 11

8�2 Level at power on �� 11

8�3 Maintenance, cleaning, change of medium �� 11

9 Technical information / Functioning / Parameters ��12

9�1 Adjustable parameters ��12

9�2 Hysteresis (Hno, Hnc):��14

9�3 Fensterfunktion (Fno, Fnc): ��14

10 Technical data ��15

11 Scale drawing ��16

12 Applications��17

12�1 Hydraulic vessel ��17

12�2 Pumping station ��18

12�3 Storage vessel ��19

1 Menu structure

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2 Controls and visual indication

Mode/Enter Set

1 LED display display of the level,

display of parameters and parameter values

2 2 x LED red switching status; lights if output I / II has switched

3Mode / Enter

button

selection of the parameters and

acknowledgement of the parameter values

4 Set button setting of the parameter values

(scrolling by holding pressed; incremental by pressing briefly)

3 Function and features

• The sensor detects the level of media in tanks within the active zone�

• It shows the current level on its display�

• It generates 2 output signals according to the set output configuration�

output 1 output 2

Switching function

(can be selected for each

output separately)

hysteresis function / N�O� (Hno)

hysteresis function / N�C� (Hnc)

window function / N�O� (Fno)

window function / N�C� (Fnc)

3.1 Measuring range

min

OFS

max

min

max

A = measured / display value

LK0022

LK7022

LK0023

LK7023

LK0024

LK7024

cm inch cm inch cm inch

L = probe length 26�4 10�4 47�2 18�6 72�8 28�7

A = active zone 19�5 7�7 39�0 15�4 58�5 23�0

I = inactive zone 5�3 2�0 5�3 2�0 10�2 4�0

min = lowest measured value 1�5* 0�6* 3�0* 1�2* 4�0* 1�6*

max = highest measured

value 21�0* 8�3* 42�0* 16�6* 62�0* 24�4*

OFS = offset 0��78�8 0��30�7 0��57�0 0��22�5 0��186 0��73�2

*With offset > 0 the OFS value is added to these values�

factory setting: OFS = 0

3.2 Offset

The area between the bottom of the vessel and the lower face of the measuring

probe can be entered as offset value� Thus the display and the switch points refer

to the real level�

3.3 Applications

• The sensor continually monitors and adjusts to the medium� Thus it adapts

itself to different media and compensates for changes in the medium�

• For water and hydrous media with temperatures > 35°C install the unit into the

climatic tube (order no� E43100, E43101, E43102)�

The sensor is not suitable for:

• Very conductive and adhesive media (shampoo, toothpaste, glue, etc�)�

• Dry granulated materials with low density�

• Media which are very inhomogeneous, separate from each other thus forming

separation layers (e�g� oil layer on water which is several cm thick or a water

layer at the bottom of a vessel filled with oil)�

- Note: A thin oil film (a few mm) on water or water based media does not affect

the function of the sensor�

4 Operating modes

4.1 Run mode

Normal operating mode

After power on and elapsing of the power-on delay time* (approx� 1 s) the unit is in

the Run mode� It monitors and switches the transistor outputs according to the set

parameters�

The display indicates the current level, the red LEDs indicate the switching state

of the outputs�

*During the power-on delay time is displayed�

4.2 Display mode

Indication of parameters and the set parameter values

When the "Mode/Enter" button is pressed briefly, the unit passes to the Display

mode which allows parameter values to be read� The internal sensing, processing

and output functions of the unit continue as if in Run mode:

• The parameter names are scrolled with each pressing of the "Mode/Enter"

button�

• When the "Set" button is pressed briefly, the corresponding parameter value is

displayed for approx� 15 s� After another 15 s the unit returns to the Run mode�

4.3 Programming mode

Setting of the parameter values

While viewing a parameter value pressing the "Set" button for more than 5 s

causes the unit to enter the programming mode� You can alter the parameter

value by pressing the "Set" button and confirm the new value by pressing the

"Mode/Enter" button� The internal sensing, processing and output functions of the

unit continue as if in Run mode with the original parameter values unless a new

value is confirmed� The unit returns to the Run mode when no button has been

pressed for 15 s�

5 Installation

5.1 Mounting elements

Mount the unit within the

inactive zone, if possible

(I; mounting area M1)�

The active zone (A)

should be completely in

the vessel�













5.2 Mounting recommendation

For an optimum function we recommend: A part of the active zone should be

above the upper edge of the vessel / above the overflow (1 cm for LKx022 /

1�5 cm for LKx023 / 2�5 cm for LKx024)�

You can also fasten mounting elements in the upper half of the active zone

(possible mounting area, M2)� This reduces the active zone to the area between

mounting element and probe end� In this case the mounting element should be

above the upper edge of the vessel / above the overflow (3 cm for LKx022 / 5 cm

for LKx023 / 8 cm for LKx024)�

5.3 Special mounting conditions

• If possible, mount the unit in the middle of the vessel when it is installed in

small plastic tanks:

• For dirty media we recommend: Fasten the unit in a zone where there is much

movement of the medium (e�g� at the supply inlet)�

• When installed in metal rising pipes (bypass) the sensor must be mounted in

the middle of the pipe� The inside diameter of the pipe must be min� 120 mm�

• Metal objects within the vessel

(e�g� metal pipes, components

integrated into the vessel) must

observe a minimum distance

of 60 mm to the active zone of

the sensor� Otherwise, they are

detected as mounting element

(this reduces the active zone to

the area between metal object

and probe end)�

min. 60mm min.

40mm

min.

10mm

A = active zone

B = metal component

• When installed in metal vessels the following distances must be observed:

- sensor - vessel wall: 40 mm

- sensor - vessel bottom: 10 mm

• When several sensors type LK or type LK and type LI are mounted in a vessel

the following distance must be adhered to: min� 45 mm between the probes�

5.4 Mounting accessories

For safe and easy mounting use the ifm mounting accessories (Order no� E43000

up to E43007)�

NOTE: Maximum vessel pressure when mounted with mounting accessories:

0�5 bar�

An overpressure of 3 bar is possible for a short time (max� 1 min�)�

6 Electrical connection

The unit must only be connected by an electrician�

The national and international regulations for the installation of electrical

equipment must be observed�

Voltage supply to EN50178, SELV, PELV�

Disconnect power before connecting the unit�

Wiring

p-switching (LK7xxx) n-switching (LK0xxx)

L+

4: OUT1

2: OUT2 L

L+

4: OUT1

2: OUT2

Core colours of ifm sockets:

1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black)�

Programming of complementary outputs:

output 1: = Hno, output 2: = Hnc,

SP1 = SP2 / rP1 = rP2�

For safe function the sensor housing must be electrically connected to the

vessel wall�

To do so, use the housing connection with the blue cable lug (see scale

drawing) and a cable piece with a wire cross-section of min� 1�5 mm² that

is as short as possible�

When using metal tanks the electrical ground of the tank serves as the

machine earth� When using plastic tanks an electrode has to be installed

that is connected to the machine earth (e�g� sheet metal in the tank in

parallel with the probe; min� distance to the probe: 40 mm�

EMC / CE guidelines

The level sensor conforms to the standard EN 50081-2 and it is a class A product�

The unit may cause radio interference in domestic areas� Therefore the user may

have to take appropriate measures, if necessary�

7 Programming

Mode/Enter Set

Press the Mode/Enter button several

times until the respective parameter is

displayed�

Mode/Enter Set

Press the Set button and keep it pressed�

The current parameter value flashes

for 5 s,

then the value is increased* (incremental

by pressing briefly or scrolling by holding

pressed)�

Mode/Enter Set

Press the Mode/Enter button briefly (=

acknowledgement)�

The parameter is displayed again, the set

parameter value becomes effective�

4Change more parameters:

Start again with step 1�

Finish programming:

Wait for 15 s or press the Mode/Enter

button until the current measured value is

indicated again�

*Decrease the value: Let the display of the parameter value move to the maximum setting

value� Then the cycle starts again at the minimum setting value�

Timeout: If no button is pressed for 15 s during the setting procedure, the unit

returns to the run mode with unchanged values�

The unit can be electronically locked to prevent unwanted adjustment of the set

parameters: Press (in Run mode) both setting buttons for 10 s� As soon as the

indication goes out the unit is locked or unlocked�

Units are delivered from the factory in the unlocked state�

With the unit in the locked state is indicated briefly when you try to change

parameter values�

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