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IFM LT80 Series, Operating Instructions Manual

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IFM LT80 Series Operating Instructions Manual Download Page 14

14

5.3.4  Offset for indicating the real level in the tank

The distance 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)

For [OFS] = [0]: The reference point is the lower edge of the measuring 

probe.
The set offset only refers to the display on the unit. 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 

consideration. 
More information 

→ 5.3.7

.

5.3.5  Defined state in case of a fault

In case of a fault a state can 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]...

[FOU4] [FOU4] 

(→ 5.3.5)

5.3.6  Extreme value memory

The minimum and maximum values of the temperatures occurred since the last 

memory reset can be retrieved via the menu items [Lo.T] and [Hi.T]. 

5.3.7  IO-Link

This unit has an IO-Link communication interface which enables direct access to 

process and diagnostic data. 
In addition it is possible to set the parameters of the unit during operation. 

Operation of the unit via IO-Link interface requires an IO-Link capable module 

(IO-Link master).
With a PC, suitable IO-Link software and an IO-Link adapter cable communication 

is possible when the system is not in operation.
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.

Summary of Contents for LT80 Series

Page 1: ...Operating instructions Electronic level and temperature sensor LT80xx 80264357 00 05 2019 UK ...

Page 2: ...verflow prevention 12 5 3 3 Display and switching functions 12 5 3 4 Offset for indicating the real level in the tank 14 5 3 5 Defined state in case of a fault 14 5 3 6 Extreme value memory 14 5 3 7 IO Link 14 6 Mounting 15 6 1 Notes on installation instructions for operation with overflow prevention 16 6 2 Installation instructions for operation without overflow prevention 17 6 2 1 Installation i...

Page 3: ...tching limits FHx FLx window function 30 10 3 4 Set set delay dSx 30 10 3 5 Set reset delay drx 30 10 3 6 Define switching logic P n 30 10 3 7 Define response of the outputs in case of a fault FOUx 30 10 3 8 Configure display diS 31 10 3 9 Reset all parameters to factory settings rES 31 11 Notes on parameter setting via IO Link 31 12 Operation 32 12 1 Operating indicators 32 12 2 Read the set para...

Page 4: ...malfunction or interference Information Supplementary note CAUTION Warning of personal injury Slight reversible injuries may result 13 5 2 Definition from the bottom 36 14 Maintenance cleaning change of medium 37 14 1 Maintenance information for operation without overflow prevention 37 15 Factory setting 38 16 Applications 39 16 1 Storage tank 39 16 2 Pumping station 40 ...

Page 5: ...oduct must be suitable for the corresponding applications and environmental conditions without any restrictions Only use the product for its intended purpose Functions and features Only use the product for permissible media Technical data If the operating instructions or the technical data are not adhered to personal injury and or damage to property may occur The manufacturer assumes no liability ...

Page 6: ... use in grinders increased risk of formation of deposits It is possible that foam of good conductivity is detected as level Test 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 3 1 For media which are very inhomogeneous separate from each other and thus forming separation l...

Page 7: ... tank via an electrical connection 7 Observe the parameter setting sequence MEdI OIL 2 10 2 6 OFS u e g u 2 0 cm 5 3 4 OP Set the 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 adjustment process cOP Step increment and setting range 13 4 Calculation aids for OP 13 5 ...

Page 8: ...maximum permitted 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 5 3 4 OFS u e g u 1 0 cm 5 3 4 SP1 Set the switch point at a distance a2 Fig 4 2 c b u a2 x Switch points SP3 and SP4 can be used to control the medium temperature and to set limit values for early warning alarm Unit must be rein...

Page 9: ...ctric 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 ...

Page 10: ... that temperature detection is indirect not in contact with the medium If a climatic tube is used considerably increased response times have to be expected 5 3 Operating principle features of the unit The unit can be installed in tanks of different sizes Observe the notes on installation 4 outputs are available They can be set separately OUT1 Switching signal for level limit value IO Link OUT2 Swi...

Page 11: ...dium 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 operational reliability Each time the operating voltage is switched on the unit adjusts itself to the medium and the installation environment For automatic media detection no overflow prevention is available Automatic ...

Page 12: ...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 replies immediately and without delay The set delay times e g of a switch point d...

Page 13: ...ysteresis function normally open Fig 5 2 oux Hno Hysteresis function normally closed Fig 5 2 oux Hnc First the set point SPx is set then the reset point rPx with the requested difference The hysteresis for the overflow prevention OP is fixed Window function normally open Fig 5 3 oux Fno Window function normally closed Fig 5 3 oux Fnc The width of the window can be set by means of the difference be...

Page 14: ...o a defined state For this case the response of the outputs can be set via the parameters FOU1 FOU4 FOU4 5 3 5 5 3 6 Extreme value memory The minimum and maximum values of the temperatures occurred since the last memory reset can be retrieved via the menu items Lo T and Hi T 5 3 7 IO Link This unit has an IO Link communication interface which enables direct access to process and diagnostic data In...

Page 15: ...robe length Zone for mounting elements Maximum outside length u y OP B Minimum distances Overflow prevention Metal object inside the tank Table 6 1 LT8022 LT8023 LT8024 cm inch cm inch cm inch L rod 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 outside length Applies to installation as shown wall thickness of the tank lid was neglected mounting element does...

Page 16: ...6 2 Observe the notes on the integrated overflow prevention OP 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 upper edge mounting element and 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 LT8022 2 5 1 0 3 5 1 4 4 ...

Page 17: ...ength c must not exceed 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 outside length Ta...

Page 18: ...2 L c a2 without offset Observe further minimum distances according to Table 6 4 Fig 6 3 c b2 L u a2 x c outside length max outside length Table 6 1 a2 Minimum distance between the mounting element and the maximum level b 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 a...

Page 19: ...t be 12 0 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 mainten...

Page 20: ... 3 L OUT 2 L BU BK WH GY PK VT BN 3 4 2 5 6 7 1 Pin Socket ifm to DIN 47100 1 BN brown white 2 WH white brown 3 BU blue green 4 BK black yellow 5 GY grey grey 6 PK pink pink 7 VT violet blue OUT1 IO Link OUT2 Switching output level OUT3 Switching output level temperature OUT4 Switching output level temperature Colours to ifm Example circuits 4 x positive switching 4 x negative switching L BU BN 3 ...

Page 21: ...ousing connection see drawing and a short piece of cable with a wire cross section of min 1 5 mm2 When using metal tanks the tank wall serves as the machine earth For plastic tanks a counter electrode must be provided e g a metal plate inside the tank in parallel with the probe Adhere to minimum distances to the probe ...

Page 22: ...tched LED 7 Switching status OUT2 lights when output 2 is switched LED 8 Switching status 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 continuously by holding pressed incremental by pressing once 11 Alphanumeric display 4 digits Display of the current level the current...

Page 23: ...4 S M S M 80 20 M dS1 dS2 0 0 Hno Hno ou3 ou4 Hno 0 0 dr1 0 0 dr2 0 0 dS3 0 0 dr3 0 0 dS4 0 0 dr4 0 0 M S M S M S M S M S M S M S M S M S M S M S M S M M M M M M M M M M M M M M S M M uni L cm S M M uni T C S Lo T P n PnP M M S M M M M M S FOU1 OFF M S FOU2 OFF M M M M M S FOU3 OFF M S FOU4 OFF OFS 0 M M M S SEL3 TEMP M S SEL4 TEMP M S M M M S SELd LEVL diS On M S M Hi T S M S M cOP Menu items hig...

Page 24: ...et Press and hold Set The current parameter value flashes for 5 s Value is increased step by step by pressing the button once or continuously by keeping the button pressed 3 Mode Enter Set Briefly press Mode Enter confirmation The parameter is displayed again the new parameter value becomes effective 4 Change more parameters Start again with step 1 Finishing the parameter setting Wait for 30 s or ...

Page 25: ...on Exemption To adjust the overflow prevention cOP the unit must be installed in the tank 10 2 Basic settings Setting ranges of all parameters 13 Factory settings of all parameters 15 10 2 1 Assign process values to the outputs SEL3 SEL4 Outputs OUT1 and OUT2 assigned to the process value level Outputs OUT3 and OUT4 programmable Select SEL3 SEL4 Assign process value to the output OUT3 OUT4 SEL3 SE...

Page 26: ... Fahrenheit 10 2 5 Set the offset OFS The distance between tank bottom and lower edge of the measuring probe can be entered as offset value 5 3 4 Set OFS before entering the values for SPx rPx or OP This avoids unintentional maladjustments Select OFS Set the value for the offset Note the set unit of measurement uni L OFS 10 2 6 Set the medium MEdI Select MEdI and set the corresponding sensitivity ...

Page 27: ...mum distances and installation instructions Select OP Define the position of the overflow prevention OP The option OP OFF deactivates the overflow prevention OP OP Set OP before SPx or FHx SPx FHx decreases if OP is reduced to a value SPx FHx after setting SPx FHx If OP and SPx FHx are close to each other 1 x step increment SPx FHx increases if OP increases When the overflow prevention is deactiva...

Page 28: ... FAIL is displayed If necessary lower the level or correct the position of the overflow prevention OP and repeat the adjustment operation cOP Minimum distance between the overflow prevention OP and the level during adjustment Table 10 1 cm inch LT8022 2 0 0 8 LT8023 3 5 1 4 LT8024 5 0 2 0 The position of the overflow prevention OP can be determined by calling up the parameter OP Note the offset if...

Page 29: ...ormally open Fnc window function normally closed If the switching output is used as an overflow prevention the setting oux Hnc NC function is recommended The principle of normally closed operation ensures that wire break or cable break is also detected 10 3 2 Define the switching limits SPx rPx hysteresis function Make sure that the function Hno or Hnc is set for oux Set SPx first then rPx Select ...

Page 30: ...hing delay reacts according to VDMA dS1 dS4 10 3 5 Set reset delay drx Select drx and set the value between 0 0 and 60 s The switching delay reacts according to VDMA dr1 dr4 10 3 6 Define switching logic P n Select P n and set PnP or nPn P n 10 3 7 Define response of the outputs in case of a fault FOUx Select FOUx and set value FOU1 FOU4 On Output switches ON in case of a fault Analogue output swi...

Page 31: ...pe 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 differ ent ways directly on the display 10 via an IO Link tool e g LR DEVICE button Teach_OP cOP via the controller write the value 208 to the IO Link index 2 length 1 byte The OP adjustment is not part of the data storage Therefore a simple rep...

Page 32: ...g temperature exceeds approx 100 C 215 F Level below the active zone FULL numerical value alternately The overflow prevention OP is reached overflow warning or the level is above the active zone It is necessary to adjust cOP of the overflow prevention OP Loc Unit locked via operating keys parameter setting impossible For unlocking press the two setting buttons for 10 s uLoc Unit is unlocked parame...

Page 33: ...e tank ground FAIL Error during adjustment of the overflow prevention OP Overflow prevention covered by the medium during adjustment Overflow prevention soiled Minimum distances too short Mounting element detected below the overflow prevention Measured value not constant Lower the level if necessary Clean the probe Observe the notes on installation Correct the position of the overflow prevention O...

Page 34: ... data Technical data and scale drawing at www ifm com 13 1 Setting values OFS Table 12 1 cm inch Setting range 0 200 0 0 78 8 LT8022 LT8023 LT8024 LT8022 LT8023 LT8024 Step increment 0 5 1 0 2 0 5 The values of the following tables apply if OFS 0 If OFS 0 they increase by the set OFS value 13 2 Setting ranges switching limits for level Table 12 2 LT8022 LT8023 LT8024 cm inch cm inch cm inch SPx FH...

Page 35: ...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 Setting range OP The indicated values for OP refer to the distance between OP and the lower edge of the probe The values apply if OFS 0 With OFS 0 the values increase by the set OFS value ...

Page 36: ...uested 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 or OP B y Example LT8022 c 3 0 cm y 5 0 cm u 1 0 cm Without offset OP 26 4 cm 3 0 cm 5 0 cm 18 4 cm With offset OP 26 4 cm 3 0 cm 5 0 cm 1 0 cm 19 4 cm Fig 12 1 OP c z B L 13 5 2 Definition from the bottom Response level z of the overflow prevention OP from the tank ...

Page 37: ...ion MEdI Auto or OP OFF overflow prevention OP deactivated The unit must be reinitialised in the following cases switch the operating voltage briefly off and on again After all maintenance operations After cleaning 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...

Page 38: ...19 5 cm 29 cm rP1 9 5 cm 19 0 cm 28 cm SP2 6 0 cm 10 0 cm 15 cm rP2 5 5 cm 9 5 cm 14 cm OP 20 4 cm 40 7 cm 61 cm SP3 65 C rP3 62 C SP4 70 C rP4 67 C MEdI OIL 2 cOP rES ou1 4 Hno dS1 4 0 0 dr1 4 0 0 uni L cm Uni T C P n PnP Lo T Hi T OFS 0 FOU1 4 OFF SEL3 TEMP SEL4 TEMP SELd LEVL diS On ...

Page 39: ...ded alarm ou1 Hysteresis function normally closed Hnc SP2 Upper preset value exceeded finish refilling ou2 Hysteresis function normally open Hno SP3 Below lower preset value start refilling ou3 Hysteresis function normally closed Hnc SP4 below min value alarm ou4b Hysteresis function normally open Hno rP1 4 Each slightly below SPx to suppress wave movements t L SP1 SP2 1 0 OUT1 Hnc 1 0 OUT2 Hno SP...

Page 40: ...re break output 4 switches off alarm message below min value wire break 16 2 Pumping station Empty the tank overflow prevention with 3 switching outputs Output OUT4 can be used for temperature monitoring SEL3 LEVL SEL4 TEMP Replaces 3 float switches and 1 temperature switch Configuration of the switching outputs 1 3 SP1 Maximum value exceeded alarm ou1 Hysteresis function normally closed Hnc SP2 U...

Page 41: ...the level exceeds SP2 output 2 switches upper value exceeded submersible pump ON If the level is below SP3 output 3 switches lower value reached submersible pump OFF Suggestion for temperature monitoring ou4 Hnc SP4 45 C rP4 40 C As long as the temperature is below SP4 the output switches If the level is above SP4 or if there is a wire break output 4 switches off alarm message overtemperature wire...

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