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IFM Electronic LK31xx, Operating Instructions Manual, Page: 11 / 36

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11

UK

5.4  Analogue functions

The unit provides an analogue signal proportional to level. The analogue output 

(OUT2) can be configured: 
• [ou2] defines the output function of the analogue output: mA / V 

(→ 10.3.2)

.

• In case of an internal fault, the output signal reacts according to the parameters

set in [FOU2] 

(→ 10.3.8)

.

5.4.1  Curve of the analogue signal with overflow prevention:

[OP] = [value ...] (overflow prevention OP activated) 
[ou2] = [I] or [U]

Fig. 5-2

Fig. 5-3

OP positioned in the upper segment.

OP shifted downward.

I [mA] / U [V]

L

20 / 10

4 / 0

A

OP

I [mA] / U [V]

L

20 / 10

4 / 0

A

OP

A: Active zone

OP: Measuring segment overflow prevention OP

L:  Level

The measuring range is limited by the active measuring segment OP. If the level 

reaches the measuring segment OP, the output signal jumps to its maximum value 

(20 mA / 10 V). 

The position of the measuring segment OP does not have any influence on 

the gradient of the curve. 

Summary of Contents for LK31xx

Page 1: ...Operating instructions Electronic level sensor LK31xx 06 2017 UK ...

Page 2: ... 5 4 1 Curve of the analogue signal with overflow prevention 11 5 4 2 Curve of the analogue signal without overflow prevention 13 5 5 Switching functions 14 5 6 Offset for indicating the real level in the tank 15 5 7 Defined state in case of a fault 15 5 8 IO Link 15 6 Mounting 16 6 1 Installation instructions for operation with overflow prevention 17 6 2 Installation instructions for operation wi...

Page 3: ...tput 29 10 3 6 Set switch off delay dr1 for switching output 29 10 3 7 Define switching logic P n for switching output 29 10 3 8 Define response of the outputs in case of a fault FOUx 29 10 3 9 Configure display diS 29 10 3 10 Reset all parameters to factory settings rES 29 11 Operation 30 11 1 Operating indicators 30 11 2 Read set parameters 30 11 3 Error indications 31 11 4 Output response in di...

Page 4: ...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 The responsibility whether the device is suitable for the respective applicat...

Page 5: ...ly conductive and adhesive media e g adhesive 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 Check 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...

Page 6: ...ll 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 connection 7 Observe the parameter setting sequence MEdI OIL 2 10 2 3 OFS u e g u 2 0 cm 5 6 OP Set 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...

Page 7: ...d 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 6 SP1 Set the switch point at a distance a2 greater than 5 0 cm below the mounting element Fig 4 2 c b u a2 x Adjustable in step increments of 0 5 cm Switch point SP1 is used as overflow prevention pump off close inle...

Page 8: ...c 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 I I E I ...

Page 9: ...um 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 oper...

Page 10: ...ned 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 rea...

Page 11: ...l with overflow prevention OP value overflow prevention OP activated ou2 I or U Fig 5 2 Fig 5 3 OP positioned in the upper segment OP shifted downward I mA U V L 20 10 4 0 A OP I mA U V L 20 10 4 0 A OP A Active zone OP Measuring segment overflow prevention OP L Level The measuring range is limited by the active measuring segment OP If the level reaches the measuring segment OP the output signal j...

Page 12: ...OP I mA U V L 20 10 4 0 A OP A Active zone OP Measuring segment overflow prevention OP L Level The measuring range is limited by the active measuring segment OP If the level reaches the measuring segment OP the output signal jumps to its minimum value 4 mA 0 V The position of the measuring segment OP does not have any influence on the gradient of the curve ...

Page 13: ...on MEdI Auto or OP OFF overflow prevention OP deactivated Fig 5 6 Fig 5 7 ou2 I or U ou2 InEG or UnEG I mA U V L A 20 10 4 0 I mA U V I mA U V L A 20 10 4 0 I mA U V A Active zone L Level MEdI Auto or OP OFF Operating mode with the lowest operational reliability 5 2 1 ...

Page 14: ...ormally closed fig 5 8 ou1 Hnc First the set point SP1 is set then the reset point rP1 with the required difference The hysteresis for the overflow prevention OP is fixed Window function normally open fig 5 9 ou1 Fno Window function normally closed fig 5 9 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 5 8 Fig 5 9 SP rP...

Page 15: ... be defined for each output 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 outputs can be set via the parameters FOU1 FOU2 10 3 8 5 8 IO Link This unit has an IO Link communication interface which requires an IO Link capable module IO Link master for operation The IO Link interface enables direct acce...

Page 16: ... object inside the tank Table 6 1 LK3122 LK3123 LK3124 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 extension 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 ...

Page 17: ...ve the notes on the integrated overflow prevention The overflow prevention OP must 1 be below the mounting element 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 6 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 LK3122 2 5 1 0 3 5 1 4...

Page 18: ...d I1 table 6 3 Ensure that the maximum level b1 is not exceeded after completed installation table 6 3 Observe further minimum distances according to table 6 4 Fig 6 2 A I1 c I2 b1 a1 x u I1 I2 Inactive zones A Active zone a1 Minimum distance between the inactive zone I1 and the maximum level b1 b1 Max level from the lower edge of the sensor without offset c Max permitted outside length observe fo...

Page 19: ...2 without offset Observe further minimum distances according to table 6 4 Fig 6 3 c b2 L u a2 x c Maximum permitted outside length observe footnote table 6 1 a2 Minimum distance between mounting element and maximum level b2 b2 Max level from the lower edge of the sensor Table 6 4 MEdI CLW 1 MEdI CLW 2 OIL 1 MEdI OIL 2 Auto 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...

Page 20: ... 12 cm 4 8 inches Install sensor in the centre For mounting in metal pipes the inside pipe diameter d must be at least Table 6 5 MEdI CLW 1 MEdI CLW 2 OIL 1 MEdI OIL 2 Auto cm inch cm inch cm inch d 4 0 1 6 6 0 2 4 10 0 4 0 6 3 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 maintenance r...

Page 21: ...to DIN EN 60947 5 2 Example circuits 1 x positive switching 1 x analogue 1 x negative switching 1 x analogue L L 3 4 2 1 BU BK WH BN 2 OUT 2 4 OUT 1 L L 3 4 1 BU BK BN 2 OUT 2 4 OUT 1 2 WH For a 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 wire cross section of min 1 5...

Page 22: ...atus OUT1 lights when output 1 is switched 9 Mode Enter button Selection of the parameters and acknowledgement of the parameter values 10 Set button Setting of the parameter values scrolling by holding pressed incremental by pressing once 11 Alphanumeric display 4 digits Indication of the current level Indication of the parameters and parameter values Operation and fault indication ...

Page 23: ...OP 20 4 cOP EF donE S S S S M M rES S M M M M M M M M S ou1 Hnc 0 0 ou2 dS1 dr1 0 0 S S S M I M M M M M uni P n S S S M M M OFS S M M M S 0 FOU1 OFF M S FOU2 OFF diS On cm PnP M S M S M 19 5 9 5 cOP RUN Menu items highlighted in grey e g cOP are only active when assigned parameters have been selected ...

Page 24: ...t again with step 1 Finish 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 Timeout If no button is pressed for 30 s during programming the unit returns to the opera...

Page 25: ...easuring probe can be entered as offset value 5 6 Set OFS before the values for SP1 rP1 or OP are entered This avoids unintentional wrong settings Select OFS Set the value for the offset Note the set unit of measurement uni OFS 10 2 3 Set medium MEdI Select MEdI Set sensitivity matching the medium to be detected MEdI CLW 1 water hydrous media coolant emulsions CLW 2 water hydrous media coolant emu...

Page 26: ...r 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 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 o...

Page 27: ...ection 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 adjustment cOP must be carried out each time MEdI or OP was changed In this case appears in the display The installation position height orient...

Page 28: ... V inverted 10 3 3 Define switching limits SP1 rp1 hysteresis function Make sure that the function Hno or Hnc is set for ou1 First set SP1 then rP1 Select SP1 and set the value at which the output switches SP1 Select rP1 and set the value at which the output is reset rP1 rP1 is always lower than SP1 The unit only accepts values which are lower than SP1 If SP1 is shifted rP1 also shifts provided th...

Page 29: ...in case of a fault OFF Output switches OFF in case of a fault Analogue output switches on 3 6 mA 0 V in case of a fault A fault is for example defective hardware too low a signal quality Overflow is not considered to be a fault 11 3 10 3 9 Configure display diS Select diS and set value diS On The display is switched on in the operating mode Update of the measured values every 500 ms OFF The displa...

Page 30: ...erflow prevention OP is reached overflow warning or the level is above the active zone 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 temporar...

Page 31: ...nstant Lower the level if possible Clean the probe Observe the notes on installation Correct the position of the overflow prevention OP Repeat the adjustment Deactivate OP 5 2 1 SC1 LED 8 Flashing short circuit in switching output OUT1 Remove the short circuit PArA Faulty data set Reset to factory settings rES 11 4 Output response in different operating states Table 11 3 OUT1 OUT2 Initialisation p...

Page 32: ... 2 Setting values OP Table 12 2 OPx LK3122 LK3123 LK3124 cm inch cm inch cm inch 20 4 8 0 40 7 16 0 61 23 9 19 1 7 5 38 3 15 1 57 22 4 17 9 7 1 35 8 14 1 53 21 0 16 7 6 6 33 4 13 1 50 19 5 15 5 6 1 31 0 12 2 46 18 1 14 3 5 6 28 5 11 2 42 16 7 13 0 5 1 26 1 10 3 39 15 2 11 8 4 7 23 6 9 3 35 13 8 10 6 4 2 21 2 8 3 31 12 3 9 4 3 7 18 8 7 4 28 10 9 8 2 3 2 16 3 6 4 24 9 5 6 9 2 7 13 9 5 5 20 8 0 OPx s...

Page 33: ...served 6 1 The following applies fig 12 1 B c L u and B z y B tank height L probe length c outside length maximum 6 u distance between probe and tank bottom y required response level OP from the cover minimum 6 1 maximum 12 2 z required response level OP from the bottom maximum z L c y or z B y 12 3 1 Definition from the cover Required distance y of the overflow prevention OP from the cover is def...

Page 34: ... 23 5 rP1 FL1 2 0 19 5 0 8 7 8 3 0 38 5 1 2 15 2 5 58 2 0 23 0 Step increment 0 5 0 2 0 5 0 2 1 0 5 The values apply if OFS 0 If OFS 0 they increase by the set OFS value Example SP1 20 0 cm OFS 7 0 cm Value displayed when the switch point is reached display 20 0 cm 7 0 cm 27 0 cm 13 Maintenance cleaning change of medium When removing or installing the unit for maintenance and cleaning Make sure th...

Page 35: ...g operations e g water jet cleaning of the sensor probe If the sensor was removed from the tank and then installed again during operation If the active zone of the sensor was touched with the hand or grounded objects e g a screwdriver a cleaning lance If the connection between the sensor and the tank wall counter electrode was changed After a change of the medium with considerably differing dielec...

Page 36: ...actory setting User setting LK3122 LK3123 LK3124 SP1 20 0 39 0 59 rP1 19 5 38 5 58 OP 20 4 40 7 61 MEdI CLW 1 cOP rES ou1 Hnc ou2 I dS1 0 0 dr1 0 0 uni cm P n PnP OFS 0 FOU1 OFF FOU2 OFF diS On More information at www ifm com ...

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