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14 Applications

14.1 Minimum level monitoring with early warning and alarm

Switching output 1: early warning
SP1

Slightly above rP1 (to suppress wave movements)

rP1

Below preset level → early warning, start refilling

OU1

Hysteresis function, normally closed (Hnc)

Switching output 2: Alarm
SP2

Min. value reached again → alarm reset

rP2

Below min. value → alarm

OU2

Hysteresis function, normally open (Hno)

XX�X = display value

A = early warning

B = alarm

• If the level is below rP1, output 1 switches until liquid is refilled� If SP1 is

reached again, output 1 switches off�

• If the level is above SP2, output 2 switches� If the level falls below rPs or if

there is a wire break, output 2 switches off�

• By setting SP1 the maximum level can be controlled / monitored: the value of

SP1 determines up to which level (max) is to be refilled� When the maximum

level is reached, this is signalled by the LED OUT1 going out and output 1

switching off�

Содержание LR7300

Страница 1: ...Operating instructions Electronic level sensor LR7300 80236090 00 03 2016 UK ...

Страница 2: ...fferent tank heights 9 5 2 6 Safe state 9 5 3 IO Link 10 6 Installation 11 6 1 Installation location environment 11 6 2 Installation of the probe 14 6 3 Shortening of the probe 15 6 4 Installation of the unit 15 6 4 1 Installation in closed metal tanks without flange plate 16 6 4 2 Installation in closed metal tanks with flange plate 16 6 4 3 Installation in open tanks 17 6 4 4 Installation in pla...

Страница 3: ...a fault 26 10 5 6 Setting of the delay time after signal loss 27 10 6 Reset all parameters to factory setting 27 10 7 Changing the probe length 27 11 Operation 28 11 1 Operating indicators 28 11 2 Read the set parameters 28 11 3 Changing the display unit in the Run mode 28 11 4 Error indications 29 11 5 Output response in different operating states 30 12 Technical data and scale drawing 30 12 1 Se...

Страница 4: ...f the unit must be carried out by qualified personnel authorised by the machine operator In order to guarantee the correct operation of the unit it is necessary to use the unit in media for which it is sufficiently resistant Technical data The responsibility as to the suitability of the unit for the application lies with the operator The manufacturer assumes no liability for consequences of misuse...

Страница 5: ... 5 E43203 30 11 8 E43226 45 17 7 E43204 50 19 7 E43227 70 27 6 E43205 100 39 4 E43207 120 47 2 E43208 140 55 1 E43209 160 63 0 E43210 Flange plate Size process connection Order number 73 90 NPT E43206 Only use rods from ifm electronic gmbh The optimum function is not ensured when using components from other manufacturers 4 Functions and features The unit continuously detects the level in tanks and...

Страница 6: ...edia Application examples Detection of coolant emulsion in a machine tool Detection of cleaning liquid in a parts cleaning system 4 1 1 Restriction of the application area Incorrect measurements or signal loss may be caused by the following media Highly absorbing surfaces e g foam Intensely bubbling surfaces Media which are very inhomogeneous separate from each other thus forming separation layers...

Страница 7: ... 4 5 Function 5 1 Measuring principle Fig 5 1 Fig 5 2 D The unit operates to the principle of guided wave radar It measures the level using electromagnetic pulses in the nanosecond range The pulses are transmitted by the sensor head and guided along the rod fig 5 1 When they hit the medium to be detected they are reflected and guided back to the sensor fig 5 2 The time between transmitting and rec...

Страница 8: ... switched between length indication cm inch and percentage Briefly press Set The selected unit is displayed for 15 s the corresponding LED is lit With each push of the button the display type is changed The set unit of measurement and the switching status of the outputs are indicated by LEDs 5 2 3 Switching functions The unit signals via two switching outputs OUT1 OUT2 that a set limit level has b...

Страница 9: ...e length is 10 cm the maximum probe length is 160 cm Probe and housing can be rotated without restriction This enables easy installation and orientation of the head of the unit after installation 5 2 6 Safe state In case of a fault a safe 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 the safe state For this case ...

Страница 10: ...d diagnostic data and provides the possibility to set the parameters of the unit during operation In addition communication is possible via a point to point connection with a USB adapter cable Further information about IO Link is available at www ifm com gb io link Device specific information You will find the IODDs necessary for the configuration of the IO Link unit and detailed information about...

Страница 11: ...s which are not straight steps supports or other structures in the tank a distance of 50 mm to the tank wall must be adhered to For probe lengths 70 cm the rod can be considerably deflected by movement of the medium To avoid contacting the tank wall or other structures in the tank in such cases the minimum distances should be increased Reference values Probe length Distance to the tank wall or str...

Страница 12: ...h must not exceed 40 mm fig 6 2 Although the unit can be installed in a boss installation in a flat tank lid is recommended A boss will impede the distribution of the microwaves Fig 6 1 Fig 6 2 d d h Do not install the unit in the immediate vicinity of a fill opening fig 6 3 If possible install a fill pipe A in the tank fig 6 4 Minimum distance between the fill pipe and the rod 50 mm higher for pr...

Страница 13: ...ation location by metal sheets perforated sheets without figure Min diameter of the bypass and still pipe d 100 mm The upper access to the steady area fig 6 5 A B has to be above the maximum level The lower access fig 6 5 C D or the area with perforated sheet etc has to be below the minimum level This ensures that neither foam nor turbulence impact the sensor zone When perforated sheets or the lik...

Страница 14: ...an be rotated without restriction Even if rotated several times there is no risk of damage to the unit 6 In case of high mechanical stress strong vibration moving viscous media it may be necessary to secure the screw connection e g by a screw retaining compound Substances such as screw retaining compounds may migrate into the medium Make sure that they are harmless When using mechanical means of s...

Страница 15: ...tightening torque 4 Nm Precisely measure the probe length L note the value It must be entered during parameter setting of the unit 10 2 L min L Lmin 10 cm 6 4 Installation of the unit For correct function the unit needs a large enough metal launching plate It is necessary for transferring the microwave pulse to the tank with optimum transmission power The flange plates that are available as access...

Страница 16: ... tanks with thick walls arrange for sufficiently deep recesses to ensure flush installation 6 4 2 Installation in closed metal tanks with flange plate Flange plates are not supplied They must be ordered separately 3 Items supplied Fig 6 8 Fig 6 9 d A R Arrange for a bore hole in the tank lid It must have a minimum diameter d to enable sufficient transfer of the measured signal to the probe fig 6 8...

Страница 17: ... of appropriate sealing material e g Teflon tape 6 4 3 Installation in open tanks For installation in open tanks use a metal fixture to install the unit It serves as a launching plate R minimum size 150 x 150 mm for a square fixture 150 mm diameter for a circular fixture If possible mount the unit in the middle of the fixture The distance D2 must not be below 40 mm higher for probe lengths 70 cm a...

Страница 18: ... drill hole Ensure the minimum distance 80 mm between rod and tank wall higher for probe lengths 70 cm and in case of heavy soiling 6 1 When installed in plastic tanks there may be deterioration caused by electromagnetic interference Corrective measures Apply a metal foil to the outside of the tank Apply a shielding screen between the level sensor and other electronic units 6 5 Alignment of the se...

Страница 19: ...ply according to EN 50178 SELV PELV Disconnect power Connect the unit as follows 4 1 3 2 OUT2 L L OUT1 IO Link 4 2 1 3 Pin Connection Core colours for ifm sockets 1 Ub brown 3 Ub blue 2 OUT2 pnp switching signal white 4 OUT1 pnp switching signal IO Link black When operating voltage is applied to the unit for the first time the probe length must be entered Only then is the unit ready for operation ...

Страница 20: ...LED 7 yellow output 1 is switched LED 8 yellow output 2 is switched 9 Alphanumeric display 4 digits Indication of the current level Operation and fault indication Indication of the parameters and parameter values 10 Set button Setting of the parameter values scrolling by holding pressed incremental by pressing once Change between cm inch indication and percent indication in the normal operating mo...

Страница 21: ...21 UK 9 Menu 9 1 Menu structure M M S M S M S M S M M S M M S M M S M M S M M S M M S M M S M M S M M S M M M S cm inch S S 15s M S M M M S M M S M M ...

Страница 22: ...imit values hysteresis function H or window function F either normally open no or normally closed nc OFS Offset value for level measurement EF Extended functions opening of menu level 2 rES Restore factory setting dr1 Switch off delay for OUT1 The menu item is only active if OU1 Hno or Hnc dr2 Switch off delay for OUT2 The menu item is only active if OU2 Hno or Hnc FOU1 Response of OUT1 in case of...

Страница 23: ... 5 s setting value is changed incrementally by pressing the button once or continuously by keeping the button pressed Numerical values are incremented continuously For reducing the value let the display move to the maximum setting value Then the cycle starts again at the minimum setting value 3 Acknowledge parameter value Briefly press Mode Enter The parameter is displayed again The new setting va...

Страница 24: ...vent unintentional settings Make sure that the unit is in the normal operating mode Press Mode Enter Set for 10 s Loc is displayed During operation Loc is briefly displayed if you try to change parameter values For unlocking Press Mode Enter Set for 10 s uLoc is displayed On delivery not locked Timeout If no button is pressed for 15 s during parameter setting the unit returns to the operating mode...

Страница 25: ... all other parameters 10 3 Configuration of the display Select Uni and set the unit of measurement cm inch Factory setting inch Select SELd and set type of indication L The level is indicated in cm or inch L The level is indicated in percent of the final value of the measuring range OFF The display is switched off in the operating mode When one of the buttons is pressed the current measured value ...

Страница 26: ...ich are lower than the value for SPx 10 5 3 Set the switching limits window function Make sure that for OU1 or OU2 the function Fno or Fnc is set Select FH1 FH2 and set the upper limit of the acceptable range Select FL1 FL2 and set the lower limit of the acceptable range FLx is always lower than FHx The unit only accepts values which are lower than the value for FHx 10 5 4 Setting of the switch of...

Страница 27: ...ng Select rES then press Set and keep it pressed until is displayed Briefly press Mode Enter The unit reboots and the factory settings are restored Note On delivery the unit is not operational You first must enter the value for the probe length 10 2 10 7 Changing the probe length Required after changes to the probe or to the application area Select LEnG and set probe length L Note the set unit of ...

Страница 28: ...c Unit electronically locked parameter setting impossible For unlocking press the two setting buttons for 10 s uLoc Unit is unlocked parameter setting is possible again S Loc If S Loc is displayed when an attempt is made to modify a parameter value either an IO Link communication is active temporary locking or the sensor is permanently locked via software This locking can only be removed with a pa...

Страница 29: ...n carry out a reset Installation conditions were not adhered to Observe the notes in Installation 6 Probe length set incorrectly Correct the settings 10 2 then carry out a reset E 034 Atypical abrupt level changes Check the dynamics if necessary use a still pipe or bypass then carry out a reset SCx Flashing short circuit in switching output x Remove the short circuit SC Flashing short circuit in a...

Страница 30: ...0 0 39 4 Step increment 0 5 0 2 The setting ranges for the switching limits SPx rPx FHx FLx depend on the probe length L In general the following applies cm inch min max min max SPx FHx 1 5 L 3 0 6 L 1 2 rPx FLx 1 0 L 3 5 0 4 L 1 4 Step increment 0 5 0 2 The values apply if OFS 0 rPx FLx is always smaller than SPx FHx If the value for SPx FHx is reduced to a value rPx FLx the position of rPx FLx a...

Страница 31: ...bodies In case of heavy soiling clean the process connection and the probe at regular intervals In case of longer operation separation layers can form in the medium e g oil on water This applies especially to still pipes or bypasses Remove separation layers at regular intervals ...

Страница 32: ... Hysteresis function normally open Hno XX X display value A early warning B alarm If the level is below rP1 output 1 switches until liquid is refilled If SP1 is reached again output 1 switches off If the level is above SP2 output 2 switches If the level falls below rPs or if there is a wire break output 2 switches off By setting SP1 the maximum level can be controlled monitored the value of SP1 de...

Страница 33: ...ly open Hno Switching output 2 overflow protection SP2 Maximum value exceeded alarm rP2 Slightly below SP2 to suppress wave movements OU2 Hysteresis function normally closed Hnc XX X display value A emptying B overflow protection If SP1 is exceeded output 1 switches submersible pump ON If the level is below rP1 again output 1 switches off submersible pump OFF If SP2 is exceeded or if there is a wi...

Страница 34: ...2 Window function normally open Fno XX X display value A refill B min monitoring C max monitoring If the level is below rP1 output 1 switches until liquid is refilled If SP1 is reached again output 1 switches off If the level is below FL2 or above FH2 or if there is a wire break output 2 switches OFF alarm The logical operation between the outputs 1 and 2 indicates whether there is overflow or the...

Страница 35: ...SP2 FH2 100 SP FHmax rP2 FL2 100 rP FLmax OU2 Hnc OFS 0 0 dr1 0 0 dr2 0 0 FOU1 OFF FOU2 OFF dFo 0 Uni inch SELd L LEnG nonE SP FHmax LEnG value in inch minus 1 2 rP FLmax LEnG value in inch minus 1 4 When the LEnG value is entered the program calculates the basic setting More information at www ifm com ...

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