IFM LK81 Series Operating Instructions Manual
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IFM LK81 Series Operating Instructions Manual

Electronic level sensor
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Operating instructions
UK
Electronic level sensor
LK81xx

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Summary of Contents for IFM LK81 Series

  • Page 1 Operating instructions Electronic level sensor LK81xx...

  • Page 2: Table Of Contents

    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 ............8...
  • Page 3 10.2.1 Set unit of measurement [uni] ............22 10.2.2 Set offset [OFS] ................22 10.2.3 Set medium [MEdI] ................23 10.2.4 Set overflow prevention [OP] ............23 10.2.5 Adjust overflow prevention [cOP] ............24 10.3 Set output signals ..................26 10.3.1 Set output function [oux] for OUTx ...........26 10.3.2 Define switching limits [SPx] / [rPx] (hysteresis function) ....26 10.3.3 Define switching limits [FHx] / [FLx] (window function) .....26 10.3.4 Set switching delays [dSx] for the switching outputs ......27...

  • Page 4: Preliminary Note

    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 •...

  • Page 5: Functions And Features

    • 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 actions. 3 Functions and features 3.1 Application area The unit was especially designed to meet the requirements of machine tool buil- ding.

  • Page 6: Getting Started

    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:...

  • Page 7: Example Configuration 2

    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. Fig. 4-2 ► Observe the distances (x), (u) and (c): min.

  • Page 8: Function

    5 Function 5.1 Measuring principle The sensor determines the level according to the capacitive measuring principle: • An electrical field [E] is generated Fig. 5-1 and influenced by the medium to be detected. This change to the field causes a measurement signal that is electronically evaluated.

  • Page 9: 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.

  • Page 10: Display And Switching Functions

    • The overflow prevention OP is not assigned to a separate output! It offers additional protection and only switches if, as the level rises, one of the output has not switched even though the corresponding switch point has been exceeded (e.g. due to application-related malfunctions). •...

  • Page 11: Offset For Indicating The Real Level In The Tank

    Fig. 5-2 Fig. 5-3 level hysteresis window 5.2.4 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).

  • Page 12: Installation

    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. 6 Installation CAUTION The housing can heat up considerably.

  • Page 13: Installation Instructions For Operation With Overflow Prevention

    * 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. 6.1 Installation instructions for operation with overflow prevention [MEdI] = [CLW..] or [OIL..] [OP] = [value ...] (overflow prevention OP activated) It is allowed to fix mounting elements in the mounting zone (M) (Fig.

  • Page 14: Installation Instructions For Operation Without Overflow Prevention

    6.2 Installation instructions for operation without overflow prevention [MEdI] = [Auto] or [OP] = [OFF] (overflow prevention OP deactivated) 6.2.1 Installation in the inactive zone Between the maximum level (b1) and the inactive zone (I1), the minimum distance (a1) has to be adhered to (see Fig. 6-2 and Table 6-3) ! ►...

  • Page 15: Installation In The Active Zone

    6.2.2 Installation in the active zone The minimum distance (a2) has to be observed between the maximum level (b2) and the mounting element (Fig. 6.3 and Table 6-4) ! ► Fix mounting elements in the mounting Fig. 6-3 zone (M) (Fig. 6-1). Adhere to the maximum permitted outside length (c) (see Table 6-1 ).

  • Page 16: Further Notes On Installation / Accessories

    In case of automatic medium detection [MEdI] = [Auto] or deactivated overflow prevention [OP] = [OFF], the sensor reinitialises itself each time it is switched on and makes adjustments to the medium and the installation environment. The active zone / measuring range must not be completely covered by the medium.

  • Page 17: Electrical Connection

    OUT1: switching output / IO-Link OUT2: switching output OUT3: switching output OUT4: switching output Colours to ifm Example circuits 4 x pnp 4 x npn 4: OUT1 4: OUT1 2: OUT2 2: OUT2 5: OUT3...
  • Page 18 For reliable function, the sensor housing must be electrically connected to the counter-electrode (grounding). ► Use the housing connection (see drawing) and a short piece of cable with a core cross section of min. 1.5 mm When using metal tanks, the tank wall serves as the machine earth.

  • Page 19: Operating And Display Elements

    8 Operating and display elements 3 4 5 6 Mode/Enter 1 to 8: Indicator LEDs LED 1 indication in centimetres LED 2 indication in inches LEDs 3...4 not used LED 5 switching status OUT4 (on when output 4 is switched) LED 6 switching status OUT3 (on when output 3 is switched) LED 7...

  • Page 20: Menu

    9 Menu 9.1 Menu structure - - - - 10.0 10.0 15.0 15.0 14.5 14.5 20.0 20.0 19.5 19.5 FOU1 MEdl FOU2 CLW.1 20.4 FOU3 donE FOU4 Menu items highlighted in grey, e.g. [ cOP ], are only active when assigned parameters have been selected.

  • Page 21: Parameter Setting

    10 Parameter setting CAUTION The housing can heat up considerably. > Risk of burns ► Do not touch the device with your hands. ► Use another object (e.g. a ballpoint pen) to carry out settings on the unit. 10.1 Parameter setting in general ►...

  • Page 22: Basic Settings

    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. >...

  • Page 23: Set Medium [Medi]

    10.2.3 Set medium [MEdI] ► Select [MEdI] and set the corresponding sensitivity: [CLW.1] = water, hydrous media, coolant emulsions MEdI [CLW.2] = water, hydrous media, coolant emulsions for temperatures > 35 °C (installation in climatic tube) [OIL.1] = oils with an increased dielectric constant (e.g. some synthetic oils) [OIL.2] = oils with a low dielectric constant (e.g.

  • Page 24: Adjust Overflow Prevention [Cop]

    If the overflow prevention is deactivated [OP] = [OFF] or [MedI] = [Auto], the reliable function of the sensor must be verified with particular care. Switch- on and switch-off processes and special operating states such as very full tanks, possible maintenance and cleaning operations are to be considered in the verification.
  • Page 25 The position of the overflow prevention OP can be determined by calling up the parameter [OP]. Note the offset if necessary. The current level is to be determined manually since the unit is not yet ready for operation before the adjustment. When the overflow prevention is activated ([OP] = [value ...]), an adjust- ment [cOP] must be carried out each time: •...

  • Page 26: Set Output Signals

    10.3 Set output signals 10.3.1 Set output function [oux] for OUTx ► Select [oux] and adjust the switching function: [Hno] = hysteresis function / normally open [Hnc] = hysteresis function / normally closed [Fno] = window function / normally open [Fnc] = window function / normally closed If the switching output is used as an overflow prevention, the setting [oux] = [Hnc] (NC function) is recommended.

  • Page 27: Set Switching Delays [Dsx] For The Switching Outputs

    10.3.4 Set switching delays [dSx] for the switching outputs ► Select [dSx] and set the value between 0.0 and 60 s. The switching delay reacts according to VDMA. 10.3.5 Set switch-off delay [drx] for switching outputs ► Select [drx] and set the value between 0.0 and 60 s. The switching delay reacts according to VDMA.

  • Page 28: Notes On Parameter Setting Via Io-Link

    11 Notes on parameter setting via IO-Link On delivery the LK81xx-type unit is not operational. First, the integrated overfill prevention OP has to be adjusted. Depending on the application, OP adjustment can be carried out in diffe- rent ways: • directly on the display (→ 10). •...

  • Page 29: Read Set Parameters

    Adjustment [cOP] of the overflow prevention OP necessary. [Loc] Unit locked via buttons; parameter setting is not possible. For unlocking press the two setting buttons for 10 s. [uLoc] Unit is unlocked / parameter setting is possible again. [C.Loc] The unit is temporarily locked. Parameter setting via IO-Link is active (temporary locking).

  • Page 30: Error Indications

    Overflow prevention OP not adjusted Overflow prevention OP adjusted or deactivated, according to the level and normal operation setting [ou1]...[ou4] OFF for [FOUx] = [OFF] Fault ON for [FOUx] = [On] 13 Technical data Technical data and scale drawing at www.ifm.com.

  • Page 31: Setting Values [Ofs]

    13.1 Setting values [OFS] Table 12-1 [cm] [inch] Setting range 0...200.0 0...78.8 LK8122 LK8122 LK8124 LK8124 LK8123 LK8123 Step increment 13.2 Setting values [OP] Table 12-2 LK8122 LK8123 LK8124 [cm] [inch] [cm] [inch] [cm] [inch] 20.4 40.7 16.0 23.9 19.1 38.3 15.1 22.4...

  • Page 32: Calculation Aids [Op]

    13.3 Calculation aids [OP] For proper functioning of the overflow prevention OP, a minimum distance (y) (Fig. 12-1) must be observed (→ 6.1). The following applies (Fig. 12-1): B: tank height L: probe length B + c = L + u c: outside length u: distance between probe and tank (maximum →...

  • Page 33: Setting Ranges [Spx] / [Fhx] And [Rpx] / [Flx]

    Round the calculated value to the next lower adjustable value (→ 13.2). 13.4 Setting ranges [SPx] / [FHx] and [rPx] / [FLx] Table 12-3 LK8122 LK8123 LK8124 [cm] [inch] [cm] [inch] [cm] [inch] [SPx] / [FHx] 2.5...20.0 1.0...7.8 3.5...39.0 1.4...15.4 6...59 2.5...23.5 [rPx] / [FLx]...

  • Page 34: Maintenance / Cleaning / Change Of Medium

    14 Maintenance / cleaning / change of medium When removing or installing the unit for maintenance and cleaning: ► Make sure that the stainless steel tube clip is fixed to the sensor. > It must be possible to exactly reproduce the installation height and position! ►...

  • Page 35: Factory Setting

    15 Factory setting Factory setting User settings LK8122 LK8123 LK8124 12.0 11.5 10.0 19.5 19.0 15.0 29.5 14.5 29.0 20.0 39.0 19.5 38.5 20.4 40.7 MEdI CLW.1 ---- ---- ou1...3 dS1...4 dr1...4 FOU1...4...

  • Page 36: Applications

    16 Applications 16.1 Storage tank Level control and min / max monitoring with 4 switching outputs. Replaces 4 float switches. Configuration of the switching outputs 1...4 maximum value exceeded → alarm hysteresis function, normally closed (Hnc) upper preset value exceeded → finish refilling hysteresis function, normally open (Hno) below lower preset value →...
  • Page 37 • If the level is below SP1, the output is switched. If the level is above SP1 or if there is a wire break, output 1 switches OFF (alarm message "overflow / wire break“). • If the level reaches SP2, output 2 switches (upper preset value reached; finish refilling).

  • Page 38: Pumping Station

    16.2 Pumping station Empty the tank / overflow prevention with 3 switching outputs. Replaces 3 float switches. Configuration of the switching outputs 1...3 maximum value exceeded → alarm hysteresis function, normally closed (Hnc) upper value exceeded → submersible pump ON hysteresis function, normally open (Hno) below the lower value →...
  • Page 39 More information at www.ifm.com...

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