Operating instructions Binary level sensor LI51 704367 / 02 02
Contents
1. NO or NC function can be set by programming buttons chapter 8 Settings NO function output closed when the level has been reached output open when the level has not been reached NC function output open when the level has been reached output closed when the level has not been reached e Automatic adjustment function to the medium to be detected by programming buttons chapter 8 Settings This allows reliable detection of media with a low dielectric constant e g oil e Level selectable by the installation length 5 3 e The unit is virtually immune to build up on the probe of almost any kind The position of the switching level within the active zone can however change with build up e Operating and switching status indication via LED ring 4 3 Application examples 1 Overflow protection in a supply tank for coolant emulsion 2 Leakage monitoring in the overflow vessel of a hydraulic power pack 3 Minimum level monitoring 5 Installation 5 1 Installation location environment e Vertical installation from the top is preferred 5 3 The following minimum distances must be adhered to Distance tank bottom end of the probe 10 mm Distance metal tank wall probe 20 mm In small plastic tanks mount the unit in the middle of the tank where possible Distance between several LI51 units depending on medium and application Guide values for standard applications distance from the centre of a pr2. installation length L2 extension length L3 mounting length at least 60 mm MET maximum installation depth active zone 31 mm gt Select the installation length L1 so that at least half the MET zone is covered when the response level A has been reached that is L1 H A 2 MET SH The unit switches when the level reaches the MET zone The exact position exact response level depends on the following factors e characteristics of the medium e installation conditions e adjustment of the unit chapter 8 Settings 6 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 to EN 50178 SELV PELV gt Disconnect power gt Connect the unit as follows core colours of ifm sockets 1 BN brown 3 BU blue 4 BK black The unit can be used as NO or NC unit chapter 8 Settings 7 Operating and display elements 1 LED ring green yellow e green operation display e yellow switching status indication 2 programming button OUT OFF 3 programming button OUT ON 8 Settings Before the first set up the basic teach empty state must be carried out 8 1 Carry out the basic teach empty state The basic teach empty state sets the unit to the empty tank and the installation conditions e g the set installation length Previous settings are deleted
3. CE 02 2013 704367 02 ifm electronic Operating instructions Binary level sensor efectorisg LI51 Contents MFM MM VA NOU aana E E geese 3 1 1 Symbols US rsin eae ES SAREE 3 2 oale ty MINS EUG ONG aoas i i 3 3 Functions and features si sccascslscnanascecescnnsssesbaedsanbdissaeicsopnsons ceisetogendeaendsadteusiuneoen 4 3 1 Application AF cccessesssssscsssssssssssssssessssesssseeseesesaesessessesacsesoesaesessesensasensas 4 3 2 Restriction of the application area ce cccccccescsscssssescsessssssecsesesseeessseeseeeees 4 Tr NN WON eree E 4 4 1 Measuring principle ccc ccccsseeseeescsssesecsssessesssecsesessessesaesaseesaesatsasensaees 4 4 2 Features of the unit ccccccsecesscsssscscssssesssscsessesseessscesseeessesesseeessseesaseessees 5 4 3 Application CX EIN DISS sacoxs ssasaaescnanedoanieactonininacnpiantutans aimed maaMinamumenenetts 6 8112112116 een eee eee ee eee ne es mene te ater ret ere ene er ee 6 5 1 Installation location ENVIFONMEN c cccccccscsesecsssseessssssseeessesessetecsssesseseees 6 2 cle tA MI IN NOC CCUG spinenie Enne EA aAa T 5 3 Set the installation length jcscecsasstuiccaccaretagasanstasiesredesscipeeeensastiaxerseracasvenscasnses 8 CEECEE E IO easi E EA 9 7 Operating and display elements ccccsceececscescsecesssssseessseeecesteeesesssesesates 9 TSS SUNN oaea n E EE T Meapten eiteatabenaseeens 10 8 1 Carry out the basic teach empty state ceccccessee
4. ce occur the user must take ap propriate remedial actions 3 Functions and features The unit monitors the level of liquids in tanks 3 1 Application area e Water hydrous media oils coolant emulsions 3 2 Restriction of the application area e The unit is not suitable for acids alkalis granulates bulk materials e tis not suitable for hygienic areas e Highly conductive foam can trigger a switching operation Check the conse quences by performing a test in your application e For water and hydrous media with temperatures gt 35 C install the unit in a climatic tube order no E43100 E43103 e Maximum tank pressure 0 5 bar when mounted using the appropriate mount ing accessories chapter 5 2 Installation procedure 4 Function 4 1 Measuring principle The unit operates to the capacitive measuring principle By direct contact with the medium the unit detects whether the requested level limit level is reached and indicates this by a switched signal The dielectric constant of a medium is important for its detection Media with a dielectric constant gt 1 8 are safely detected coolant emulsion Electrically conductive and non conductive media are detected The unit operates with radial detection characteristics Therefore media below the active zone are not detected Despite different electrical properties media are only detected when the active zone A is covered 4 2 Features of the unit
5. csscsessessseessesseeeees 10 8 2 Carry out the basic teach full state cc cesssessssssesssssesessssersesseeeeessees 10 8 3 Set the deposit suppression OPTION c ceccseessessssecsssecseecessesseeeeseeees 11 8 4 Lock unlock the UNit c ccc ccesccsessescsecsesesecsecessesessecessesessesesaesessssesaeeeses 11 Lao e o ee ke eae en ee eee aCe ne eee ee eee ee 11 10 Maintenance repair and diSPOSAl cccceccesesccseessssscssssssessssessesseeesseseesates 12 11 Technical data and scale GAWING siicedsicsiss iensonsnizsdadvinasnsnasnarnacudsaeavunsavandasendaniaaan 12 1 Preliminary note 1 1 Symbols used gt Instruction gt Reaction result Designation of pushbuttons buttons or indications Cross reference Important note Non compliance can result in malfunctions or interference Information Supplementary note 2 Safety instructions e Please read the product description prior to set up of the unit Ensure that the product is suitable for your application without any restrictions f the operating instructions or the technical data are not adhered to personal injury and or damage to property can occur e Installation electrical connection set up operation and maintenance of the unit must only be carried out by qualified personnel authorised by the machine operator e The unit conforms to the standard EN 61000 6 4 The unit may cause radio interference in domestic areas If interferen
6. differ greatly e g oil water another adjustment should be carried out It is not possible to repair the unit After use dispose of the unit in an environmentally friendly way in accordance with the applicable national regulations 11 Technical data and scale drawing Technical data and scale drawing at www ifm com Data sheet search Enter the article number More information at www ifm com 12
7. gt Empty the tank until the medium is at least 20 mm below the end of the probe gt Press OUT OFF keep it pressed for min 2 s max 6 s gt The yellow LED flashes slowly When the button is released it goes out The unit is then ready for operation and set as NO unit output ON when the level has been reached If the unit is to be set as NC unit gt After emptying the tank press OUT ON instead of OUT OFF After releasing the pushbutton the yellow LED lights continuously 8 2 Carry out the basic teach full state The empty adjustment is sufficient for media with a low dielectric constant e g oils For aqueous media the sensitivity must be optimised by a full adjustment The full adjustment does not change the settings of the empty adjustment gt Fill the tank until the active zone of the unit is covered gt lf the unit is set as NO unit 8 1 the yellow LED lights if it is set as NC unit it goes out gt If the unit is set as NO unit press OUT ON and keep it pressed for at least 6s gt The yellow LED flashes slowly after 6 s it flashes quickly After releasing the pushbutton it lights continuously If the unit is set as NC unit After filling the tank press OUT OFF instead of OUT ON After releasing the pushbutton the yellow LED goes out 10 8 3 Set the deposit suppression option This setting largely suppresses deposits in the tank and on the probe Previous settings are not changed
8. gt Empty the tank until the medium is at least 20 mm below the end of the probe end If the unit is set as NO unit 8 1 the yellow LED goes off if it is set as NC unit it lights gt If the unit is set as NO unit press OUT OFF and keep it pressed for at least 6s gt The yellow LED flashes slowly after 6 s it flashes quickly When the button is released it goes out UK If the unit is set as NC unit After emptying the tank press OUT ON instead of OUT OFF After releasing the pushbutton the yellow LED lights continuously 8 4 Lock unlock the unit The unit can be locked electronically to prevent unintentional settings gt Press both setting pushbuttons simultaneously for at least 10 s in the operating mode gt The yellow LED temporarily changes its status If it lights at the beginning of the setting operation it goes out for a few seconds If is does not light in the beginning it lights for a few seconds Then the unit is locked or unlocked On delivery unlocked 9 Operation When the supply voltage has been applied the unit is in the operating mode It carries out its measurement and evaluation functions and switches the output Operation indication by LED OFF 10 Maintenance repair and disposal Recommended maintenance gt Check the probe for build up from time to time clean it in case of strong soiling ER After removal of the unit or a change of media with dielectric constants that
9. obe to the centre of another probe Water coolant emulsion in a grounded metal tank 40 mm Oils in a grounded metal tank 100 mm Water aqueous media and oils in an ungrounded plastic tank 200 mm Depending on the application greater distances can be required Please check this by a function test under real operating conditions Distance between LI51xx and LKxxxx units min 60 mm from the centre of a probe to the centre of another probe 5 2 Installation procedure The unit is mounted using a mounting clamp or an adapter The following standard mounting accessories are available Order no e mounting clamp for non pressurised tANKS ccceesesesstssscseseeecsseeeseseeessseeeeees E43000 e mounting clamp with mounting bracket for non pressurised tankS cccccceeeee E43016 flange plate with clamp adapter pressure rating Of 0 5 Dar cessssesseeeeeeeeeen E43001 e welding adapter with clamp adapter pressure rating Of 0 5 Dar csceseeeeen E43002 e mounting adapter G with clamp adapter stainless steel pressure rating of 0 5 bar E43003 e mounting adapter G1 with clamp adapter stainless steel pressure rating of 0 5 bar E43004 e mounting adapter G with clamp adapter brass pressure rating of 0 5 bar Further accessories on request 5 3 Set the installation length A response level H tank height SH height of the connection piece L probe length L1
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