IFM Electronic LK31 Series Manual
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IFM Electronic LK31 Series Manual

IFM Electronic LK31 Series Manual

Electronic level sensor
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Operating instructions
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Electronic level sensor
LK31xx

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Summary of Contents for IFM Electronic LK31 Series

  • Page 1 Operating instructions Electronic level sensor LK31xx...

  • Page 2: Table Of Contents

    LK31xx Electronic level sensor Contents Preliminary note ............. Symbols used .
  • Page 3 Electronic level sensor LK31xx 10.5.2 Setting values [OP] ..........28 10.5.3 Calculation aids [OP].

  • Page 4: Preliminary Note

    LK31xx Electronic level sensor 1 Preliminary note You will find instructions, technical data, approvals and further information using the QR code on the unit / packaging or at documentation.ifm.com. 1.1 Symbols used Requirement Instructions Reaction, result [...] Designation of keys, buttons or indications Cross-reference Important note Non-compliance may result in malfunction or interference.

  • Page 5: Safety Instructions

    Electronic level sensor LK31xx 2 Safety instructions • The unit described is a subcomponent for integration into a system. – The system architect is responsible for the safety of the system. – The system architect undertakes to perform a risk assessment and to create documentation in accordance with legal and normative requirements to be provided to the operator and user of the system.

  • Page 6: Intended Use

    LK31xx Electronic level sensor 3 Intended use The device 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. 3.1 Restriction of the application area •...

  • Page 7: Getting Started

    Electronic level sensor LK31xx 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 Configuration example 1 Device: LKx122 (probe length L= 264 mm) Medium to be detected: Mineral oil Operating mode:...
  • Page 8 LK31xx Electronic level sensor u Install device. u Observe the distances (x), (u) and (c): min. 4.0 cm min. 1.0 cm max. 23.0 cm u Ground the sensor with the tank: Electrical connection (Ò / 18) u Observe the maximum permitted level (b). A distance (a2) greater than 5.0 cm has to be observed between maximum level (b) and mounting element.

  • Page 9: Function

    Electronic level sensor LK31xx 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. •...

  • Page 10: Notes On The Integrated Overflow Prevention

    LK31xx Electronic level sensor For automatic media detection (parameter [MEdI] = [Auto]), 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): Maintenance information for the operation without overflow prevention (Ò / 32) 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 OP.

  • Page 11: Curve Of The Analogue Signal Without Overflow Prevention

    Electronic level sensor LK31xx I [mA] / U [V] I [mA] / U [V] 20 / 10 20 / 10 4 / 0 4 / 0 Fig. 4: OP positioned in the upper segment Fig. 5: OP shifted downward Active zone Active zone measuring segment overflow prevention OP measuring segment overflow prevention OP level...

  • Page 12: Switching Function

    LK31xx Electronic level sensor I [mA] / U [V] I [mA] / U [V] I [mA] / U [V] I [mA] / U [V] 20 / 10 20 / 10 4 / 0 4 / 0 Fig. 8: [ou2] = [I] or [U] Fig. 9: [ou2] = [InEG] or [UnEG] Active zone Active zone...

  • Page 13: Safe State In Case Of A Fault

    Electronic level sensor LK31xx For [OFS] = [0]: The reference point is the lower edge of the measuring probe. The set offset only refers to the display on the device. 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: IO-Link (Ò / 13) 5.2.7 Safe state in case of a fault...

  • Page 14: Installation

    LK31xx Electronic level sensor 6 Installation Fig. 12: Installation Probe length u...y: Minimum distances Zone for mounting element Overflow prevention Maximum outside length Metallic objects in the tank Table installation: LKx022 LKx023 LKx024 [cm] [inch] [cm] [inch] [cm] [inch] L (probe length) 26.4 10.4 47.2...

  • Page 15: Installation Instructions For The Operation Without Overflow Prevention

    Electronic level sensor LK31xx MEdI = CLW.1 MEdI = CLW.2, OIL.1 MEdI = OIL.2 y (LKx022) y (LKx023) y (LKx024) Calculation aids for [OP]: Calculation aids [OP] (Ò / 28) 6.2 Installation instructions for the 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.

  • Page 16: Installation In The Active Zone A Of The Probe

    LK31xx Electronic level sensor 6.2.2 Installation in the active zone A of the probe Between the maximum level (b2) and the mounting element a minimum distance (a2) has to be observed. Ò Figure and Ò Table  Installation in the active zone A of the probe. u Fix mounting elements in the mounting zone (M) Ò...

  • Page 17: Marking Of The Installation Height

    Electronic level sensor LK31xx Table other installation instructions: MEdI = CLW.1 MEdI = CLW.2, OIL.1 MEdI = OIL.2/ Auto [cm] [inch] [cm] [inch] [cm] [inch] 10.0 6.3.1 Marking of the installation height u Fix the set installation height with the supplied stainless steel tube clip. If the sensor is removed from the fixture for maintenance reasons, the clip serves as a limit stop when remounting the sensor.

  • Page 18: Electrical Connection

    LK31xx Electronic level sensor 7 Electrical connection The unit must be connected by a qualified electrician. Observe the national and international regulations for the installation of electrical equipment. Voltage supply according to SELV, PELV. u Disconnect power. u Connect the unit as follows: OUT2 OUT1 Core colour...

  • Page 19: Operating Elements And Display Elements

    Electronic level sensor LK31xx 8 Operating elements and display elements 3 4 5 6 Mode/Enter 1 to 8: Indicator LEDs LED 1 Indication in centimetres. LED 2 Indication in inches LED 3 – 7 Not used. LED 8 Switching status OUT1 (on if output 1 is switched). 9: [Mode/Enter] button •...

  • Page 20: Menu

    LK31xx Electronic level sensor 9 Menu 9.1 Menu structure - - - - 20.0 10.0 19.5 MEdl CLW.1 20.4 donE FOU1 FOU2 Menu items highlighted in grey e.g. [cOP] are only active when assigned parameters have been selected.

  • Page 21: Parameter Setting

    Electronic level sensor LK31xx 10 Parameter setting Depending on the parameter setting, the parameters available in the menu may change. Parameter setting can be carried out via the IO-Link interface or via the operating elements on the unit. Parameters can be set before installation or during operation. If you change parameters during operation, this will influence the function of the plant.

  • Page 22: Parameter Setting In General

    LK31xx Electronic level sensor 10.2 Parameter setting in general 3 steps must be taken for each parameter setting: 1: Select Parameter u Press [Mode/Enter] until the requested parameter is displayed. 2: Set parameter value 10.0 14.0 u Press [SET] and keep it pressed. w Current setting value of the parameter flashes for 5 s.
  • Page 23 Electronic level sensor LK31xx If [S.Loc] is displayed, the sensor is permanently locked via software. This locking can only be removed with a parameter setting software. Change from menu level 1 to menu level 2 u Press [Mode/Enter] until [EF] is displayed. u Briefly press [Set].

  • Page 24: Basic Settings

    LK31xx Electronic level sensor If no button is pressed for 30 s during parameter setting, the device returns to the operating mode with unchanged values. The device can be configured before or after installation. Exception: to adjust the overflow prevention [cOP], the device must be installed in the tank. 10.3 Basic settings Setting ranges of all parameters: Setting values and calculation aids (Ò / 27)

  • Page 25: Setting The Overflow Prevention

    Electronic level sensor LK31xx 10.3.4 Setting the overflow prevention u Observe minimum distances and installation specifications [OP] u Select [OP] u Define the position of the overflow prevention OP. The option [OP] = [OFF] deactivates the overflow prevention OP. u Set [OP] before [SPx] or [FHx]. w If [OP] is reduced after setting [SPx] / [FHx] to a value ≤ [SPx] / [FHx], [SPx] / [FHx] shifts downwards.

  • Page 26: Setting Of Output Signals

    LK31xx Electronic level sensor With deactivated overflow prevention ([OP] = [OFF] or [MEdI] = [Auto]): To apply the basic settings and to adapt to the medium and installation environment the device has to be reinitialised when installed. u Switch the operating voltage off and on again. 10.4 Setting of output signals 10.4.1 Setting of the output function for OUT1 u Select [OU1] and set the switching function:...

  • Page 27: Setting The Switch-Off Delay

    Electronic level sensor LK31xx 10.4.6 Setting the switch-off delay u Select [dr1] and set the value between 0.0 and 60 s. [dr1] The switch-off delay reacts according to VDMA. 10.4.7 Setting the switching logic for the output u Select [P-n] and set [PnP] or [nPn]. [P-n] 10.4.8 Defining the response of the outputs in case of a fault (safe state) u Select [FOUx] and set the value:...

  • Page 28: Setting Values [Op]

    LK31xx Electronic level sensor 10.5.2 Setting values [OP] Section LKx022 LKx023 LKx024 [cm] [inch] [cm] [inch] [cm] [inch] 20.4 40.7 16.0 23.9 19.1 38.3 15.1 22.4 17.9 35.8 14.1 21.0 16.7 33.4 13.1 19.5 15.5 31.0 12.2 18.1 14.3 28.5 11.2 16.7 Fig. 17: Setting values / OPx: 13.0...

  • Page 29: Definition "From The Cover

    Electronic level sensor LK31xx 10.5.3.1 Definition ”from the cover” Required distance (y) of the overflow prevention OP "from the cover" is defined. • Without offset ([OFS] = [0]): [OP] = L - c - y • With offset ([OFS] = u): [OP] = L - c - y + u [OP] = B - y Example: c = 3.0 cm, y = 5.0 cm, u = 1.0 cm...

  • Page 30: Operation

    LK31xx Electronic level sensor 11 Operation After switch-on of the supply voltage, the device is in the operating mode (= normal operating mode). It carries out its measurement and evaluation functions and generates output signals according to the set parameters. u Check whether the device operates correctly. 11.1 Operating indicators [---] continuous Initialisation phase after power on.

  • Page 31: Output Response In Different Operating States

    Electronic level sensor LK31xx 11.4 Output response in different operating states OUT1 OUT2 Initialisation phase 0 mA Overflow prevention OP not adjusted 3.5 mA Overflow prevention OP adjusted or deactivated, According to process value and According to the process value normal operation setting [ou1] 4...20 mA Fault / safe state OFF for [FOU1] = [OFF]...

  • Page 32: Repair, Maintenance And Disposal

    LK31xx Electronic level sensor 12 Repair, maintenance and disposal u After use, dispose of the unit in an environmentally friendly way in accordance with the applicable national regulations. u For transport only use appropriate packaging to avoid damage of the unit. u In case of return shipment, ensure that the unit is free from soiling, especially from dangerous and toxic substances.

  • Page 33: Factory Setting

    Electronic level sensor LK31xx 13 Factory setting Factory setting User settings LKx022 LKx023 LKx024 20.0 39.0 19.5 38.5 20.4 40.7 MEdI CLW.1 ---- ---- FOU1 FOU2...

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