IFM efector160 LR2750 User manual

Operating instructions
Electronic level sensor
LR2750
80230930 / 00 07 / 2015 (Ref. 80230928 / 00 07 / 2015)
UK

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Contents
1 Preliminary note...................................................................................................4
1.1 Symbols used ................................................................................................4
2 Safety instructions ...............................................................................................4
3 Items supplied......................................................................................................5
4 Getting started .....................................................................................................5
5 Functions and features ........................................................................................6
5.1 Applications ...................................................................................................6
6 Function...............................................................................................................7
6.1 Measuring principle .......................................................................................7
6.2 Other features of the unit...............................................................................7
6.2.1 Display functions ..................................................................................8
6.2.2 Analogue function ................................................................................8
6.2.3 Switching functions ............................................................................10
6.2.4 Damping function................................................................................ 11
6.2.5 Defined state in case of a fault ........................................................... 11
6.2.6 IO-Link ................................................................................................12
6.2.7 Simulation functions ...........................................................................12
7 Installation .........................................................................................................12
7.1 Installation location / environment ...............................................................12
7.1.1 Installation distances ..........................................................................12
7.1.2 Notes on the tank adjustment.............................................................16
7.2 Installation of the probe ...............................................................................17
7.2.1 Installation of the rod ..........................................................................17
7.3 Shortening of the probe, determination of the probe length ........................18
7.4 Installation of the unit in the tank .................................................................19
7.4.1 Installation in open tanks ....................................................................21
7.4.2 Installation in plastic tanks..................................................................22
7.4.3 Note on the use in accordance with EHEDG......................................22
8 Electrical connection..........................................................................................23
9 Operating and display elements ........................................................................24
10 Menu................................................................................................................25
10.1 Menu structure...........................................................................................25

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10.2 Explanation of the menu............................................................................27
10.2.1 Main menu........................................................................................27
10.2.2 EF level (extended functions) ...........................................................27
10.2.3 CFG level (configuration)..................................................................28
10.2.4 ENV level (environment)...................................................................28
10.2.5 SIM level (simulation) .......................................................................28
11 Parameter setting.............................................................................................29
11.1 Parameter setting in general......................................................................29
11.2 First set-up (unit with factory setting).........................................................31
11.2.1 Entering the probe length .................................................................31
11.2.2 Carry out tank adjustment.................................................................32
11.3 Configure display (optional) .......................................................................32
11.4 Setting of output signals.............................................................................33
11.4.1 Setting of the output function for OUT1 ............................................33
11.4.2 Setting of the output function for OUT2 ...........................................33
11.4.3 Setting of switching limits (hysteresis function) ................................33
11.4.4 Scaling of the analogue signal..........................................................33
11.4.5 Setting of switching limits (window function).....................................34
11.4.6 Set the switching delays for switching outputs .................................34
11.4.7 Set the switch-off delay for switching outputs...................................34
11.4.8 Response of the outputs in case of a fault........................................34
11.4.9 Set output logic for the switching outputs .........................................34
11.4.10 Set damping for the switching signal ..............................................34
11.4.11 Setting the delay time for cases of fault ..........................................35
11.5 Reset all parameters to factory setting ......................................................35
11.6 Changing basic settings.............................................................................35
11.6.1 New entering of the probe length......................................................35
11.6.2 Setting to another medium................................................................36
11.7 Simulation ..................................................................................................36
11.7.1 Set simulation value..........................................................................36
11.7.2 Set simulation time ...........................................................................36
11.7.3 Switch simulation on / off ..................................................................36
12 Operation.........................................................................................................37
12.1 Operating indicators ..................................................................................37
12.2 Reading the set parameters ......................................................................38
12.3 Change the display unit in the operating mode .........................................38

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1 Preliminary note
1.1 Symbols used
►Instructions
> Reaction, result
[…] Designation of keys, buttons or indications
→Cross-reference
Important note
Non-compliance may result in malfunction or interference.
Information
Supplementary note.
2 Safety instructions
• Read this document prior to set-up of the unit. Ensure that the product is
suitable for your application without any restrictions.
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property can occur.
• Improper or non-intended use may lead to malfunctions of the unit or to
unwanted effects in your application. That is why installation, electrical
connection, set-up, 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).
• It is the operator's responsibility to verify whether the device is suitable for the
respective application. The manufacturer assumes no liability for consequences
of misuse by the operator.
12.4 Fault indications.........................................................................................38
12.5 Output response in different operating states............................................39
13 Technical data..................................................................................................39
14 Maintenance / Transport..................................................................................40
14.1 Transport ...................................................................................................40
15 Factory setting .................................................................................................41

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• Improper installation and use of the device result in a loss of the warranty
claims.
• The unit may cause radio interference in domestic areas. If interference occurs,
the user must take appropriate remedial actions.
• The unit complies with the standard EN 61000-6-4 and is a class A product.
The radiated energy of the microwaves is, for example, much below that of
mobile phones. According to the current state of science the operation of the
unit can be classified to be harmless to human health.
3 Items supplied
• LR2750 level sensor
• Operating instructions
In addition, the following is necessary for installation and operation:
• Rod
• Mounting adapter / welding adapter (a launching plate if required → 5)
Available accessories: www.ifm.com → Data sheet search → Accessories
Only use accessories from ifm electronic gmbh. The optimum function is
not ensured when using components from other manufacturers.
4 Getting started
For fast set-up and unless there are any other requirement the quick set-up
described below is possible for most applications. The quick set-up does not
replace observance of the other chapters.
►Install the unit correctly (→ 7.1 and → 8).
►Enter probe length (→ 11.2).
>The unit is ready for operation.
►If required, carry out tank adjustment (parameter [tREF] → 11.2.2).
►If required, set switching limits for OUT1
(parameters [SP1] / [rP1] → 11.4.3).
►If required, scale analogue output OUT2
(parameters [ASP2] / [AEP2] → 11.4.4).

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5 Functions and features
The unit continuously detects the level of liquids and viscous media in tanks and
generates output signals according to the parameter settings.
2 outputs are available. They can be set separately.
OUT1 Switching signal for level limit value / IO-Link
OUT2 • Analogue signal proportional to level 4...20 / 20...4 mA
or
• switching signal for level limit value
For correct function the unit needs a sufficiently large metal launching
surface / launching plate ("antenna"). It is necessary for transferring the
microwave pulse to the tank with optimum transmission power (→ 6
Function).
For installation in closed metal tanks / metal bypass pipes, the tank lid /
upper pipe section serves as a launching surface / launching plate. For
installation in open tanks and plastic tanks, a sufficiently large holding
device, a metal plate or similar must be used. More information → 7
Installation.
5.1 Applications
• Suitable for food and hygienic areas due to food-grade materials and hygienic
installation options.
• Detection of almost all media, even extremely adhering or non-conductive
ones.
• Multiple installation options via a large number of available mounting and
welding adapters (e.g. Clamp, pipe fitting, Varivent).

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6 Function
6.1 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 receiving the pulse
directly relates to the travelled distance (D) and the current level. The reference for
distance measurement is the lower edge of the process connection.
The signal quality may be affected with:
- intensely absorbing surfaces (e.g. strong foam formation)
- intensely bubbling surfaces
- media which are very inhomogeneous, separate from each other thus
forming separation layers (e.g. oil layer on water)
►Check the function by an application test
6.2 Other features of the unit
• Hygienic approvals / conformities (→ Technical data sheet)
• For CIP / SIP applications: High temperature range (→ Technical data sheet)
• Special operating mode for media with increased foam formation → 11.6.2

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• Tank adjustment enables suppression of undesired interference
(e.g. caused by installations in the tank or when mounted in a connection piece
(→ 11.2.2))
• Display of the level and the switching status via display / LEDs
• IO-Link function (→ 6.2.6)
Technical data sheet at www.ifm.com → New search → Enter the article
number
6.2.1 Display functions
The unit displays the current level, either in mm, inch or in percent of the final
value of the measuring range. Factory setting: mm. The display unit is defined by
programming (→ 11.3).
In the operating mode, it can be temporarily switched between mm, inch and
percentage (→ 12.3).
The set unit of measurement and the switching status of the outputs are indicated
by LEDs (→ 9).
6.2.2 Analogue function
The unit provides an analogue signal proportional to the level. The analogue
output (OUT2) can be configured (→ 11.4).
• [ou2] defines the output function of the analogue output (→ 11.4.2).
• Analogue start point [ASP2] defines at which measured value the output signal
is 4 mA ([ou2] = [I]) or 20 mA ([ou2] = [InEG]) (→ 11.4.4).
• Analogue end point [ASP2] defines at which measured value the output signal
is 20 mA ([ou2] = [I]) or 4 mA ([ou2] = [InEG]) (→ 11.4.4).
Minimum distance between [ASP2] and [AEP2] = 20 % of the active zone.
Curve of the analogue signal (factory setting):

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I [mA]
L
20
4
A
I2 I1
Curve of the analogue signal (measuring range scaled):
I [mA]
L
20
4
A
ASP2 AEP2
I1I2
L: Level
①:
[ou2] = I (factory setting)
A: Active zone = L-(I1+I2)
②:
[ou2] = [InEG]
I1: Inactive zone 1 ASP2 Analogue start point
I2: Inactive zone 2 (→ Technical data sheet) AEP2: Analogue end point
In the set measuring range the output signal is between 4...20 mA ([ou2] = [I]) or
20…4 mA ([ou2] = [InEG]).

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Additional information of the output signal:
• Level above the measuring range:
- Output signal 20…20.5 mA at [ou2] = [I]
- Output signal 4…3.8 mA at [ou2] = [InEG].
• Level below the measuring range:
- Output signal 4…3.8 mA at [ou2] = [I]
- Output signal 20…20.5 mA at [ou2] = [InEG].
• In case of a fault, according to the setting [FOUx]:
- Output signal < 3.6 mA at [FOUx] = [OFF] (factory setting)
- Output signal > 21 mA at [FOUx] = [On]
Note the tolerances and accuracy limits during the evaluation of the analogue
signal (→ Technical data sheet).
6.2.3 Switching functions
The unit signals via switching output OUT1 or in addition via OUT2 (can be set)
that a set limit level has been reached or that the level is below the limit value. The
following switching functions can be selected:
• Hysteresis function / normally open (fig. 5-3): [oux] = [Hno].
• Hysteresis function / normally closed (fig. 5-3): [oux] = [Hnc].
First the set point (SPx) is set, then the reset point (rPx) with the required
difference.
• Window function / normally open (fig. 5-4): [oux] = [Fno].
• Window function / normally closed (fig. 5-4): [oux] = [Fnc].
The width of the window can be set by means of the difference between
FHx and FLx. FHx = upper value, FLx = lower value.

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fig. 5-3 fig. 5-4
SP
rP
t
L
FH
FL
1
0
1
0
FE
Fno
Fnc
L :
HY:
FE:
Level
Hysteresis
Window
• For the switching output a switch-off delay of max. 60 s can be set (e.g. for
especially long pump cycles).
6.2.4 Damping function
With unsteady level (e.g. turbulence, wave movements...) display and output
response may be damped. During damping the determined level values are
"smoothed" by means of a mean filter; the result is a steady curve. The damping
constant Τ*) can be set (→ 11.4.10).
*) Τ indicates after what time 63 % of the final value are reached in the event of a sudden
jump. After 5 T almost 100 % have been reached.
6.2.5 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 according to NAMUR recommendation
(NE43). For this case the response of the outputs can be set via the
parameters [FOU1], [FOU2] (→ 11.4.8).
• Temporary loss of signal caused e.g. by turbulence or foam formation can be
suppressed by a delay time (→ 11.4.11 [dFo]). During the delay time the last
measured value is frozen. If the measured signal is received again in sufficient
strength within the delay time, the unit continues to work in normal operation. If,
however, it is not received again in sufficient strength within the delay time, the
outputs pass into the defined state.

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6.2.6 IO-Link
General information
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 access to the process and 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 process data structure, diagnostic information and
parameter addresses at www.ifm.com/gb/io-link.
Parameter setting tools
You will find all necessary information about the required IO-Link hardware and
software at www.ifm.com/gb/io-link.
6.2.7 Simulation functions
Various levels and errors can be simulated for set-up, maintenance or interference
restriction. The duration of the simulation can be selected (1 min...1 h). The
simulation can be started manually and runs until it is stopped manually or the
set time elapses. During the simulation the outputs respond according to the
simulated process values
(→ 11.7...→ 11.7.3).
7 Installation
7.1 Installation location / environment
• Vertical installation from the top is preferred.
• Installation preferably in closed, metal tanks or bypass pipes.
• For installation in open tanks (→ 7.4.1) or plastic tanks (→ 7.4.2).
7.1.1 Installation distances
►Observe the notes on tank adjustment (→ 7.1.2).
• Installation in connection pieces possible.

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►Note min. connection piece diameter D according to the figure / table below.
Select a connection piece height that is smaller than the connection piece
diameter.
• The rod must adhere to the following min. distances to the tank wall, objects
(B) in the tank and at the tank bottom:
A1
BA2
A3
D
Installation distances with adjustment Installation distances without adjustment
A1: 10 mm A1: 10 mm
A2: 20 mm A2: 50 mm
A3: 20 mm A3: 50 mm
D: ≥ DN 30 D: No connection piece allowed
• With intensely agitated medium (flow, agitator etc.) or heavy soiling:
►Adhere to increased minimum distances to avoid that the rod gets into
contact with the tank wall or structures in the tank.

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Reference values:
Probe length Distance to the tank wall or structures in the tank
700...1000 mm Increase by 40 mm
1000...2000 mm Increase by 120 mm
• For applications with viscous or intensely flowing media and / or with agitators
in which the probe is exposed to continuous and heavy mechanical load the
probe has to be fixed at the lower end and be electrically conductive unless
hygienic demands do not allow this. Fixing at the tank bottom is possible by
means of a sleeve or similar devices.
►The function has to be ensured by carrying out an application test.
• Do not install the unit in the immediate vicinity of a fill opening (fig. 6-1).
fig. 6-1

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This may result in incorrect measurements with heavy foam formation and
turbulence.
To avoid this
►install the sensor in a steady area by observing the hygienic
requirements.
Example how to create a steady area:
• Installation in metal bypass or metal still pipe (fig. 6-2)
• Separation of the installation location by metal sheets / perforated
sheets (without figure)
fig. 6-2
d
d
AB
CD
Min. diameter of the bypass and still pipe:
Installation with adjustment without adjustment
Diameter ≥ DN 30 ≥ DN 250
The upper access to the steady area (A, B) has to be above the max. level.
The lower access (C, D) or the area with perforated sheet has to be below
the min. level. This ensures that neither foam nor turbulence impact the
sensor zone. When perforated sheets or the like are used, soiling (e.g. by
solids in the medium) can also be avoided.

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With increased foam formation the setting [MEdI] = [MId] is recommended
(→ 11.6.2).
Depending on the operating conditions and the mechanical structure of the
bypass or still pipe such as rod does not run centred, flow routes rod to the
tank wall, soiling, ... the use of centring pieces is recommended.
►If required, provide for one or several centring pieces between the rod
and the pipe.
7.1.2 Notes on the tank adjustment
To improve the signal quality a tank adjustment can be made (→ 11.2.2). For the
tank adjustment it is necessary to enter an "adjustment distance" first. Within
this distance, starting with the process connection, the interfering reflections are
compensated.
►Select an adjustment distance size (a) so that the connection piece (S) and
structures in the tanks (B) are completely detected.
►Observe safety distances (b) to the level or the rod end b ≥250 mm.
b
a
B
S
a:
b:
S:
B:
Adjustment distance (min.: 10 mm; max.: L - 250 mm)
Safety distance to the level or the rod ends: b ≥ 250 mm
Connection piece
Structures in the tank

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• Carry out a tank adjustment with empty tank, if possible, to cover any
possible interfering sources. In this case:
►Select the max. adjustment distance (L - 250 mm).
• For probe lengths L < 250 mm no tank adjustment is possible.
In this case:
►Keep to the indicated installation distances → 7.1.1 .
• With probe lengths L > 250 mm:
►The level or the probe end have to be min. 250 mm below the
adjustment distance.
• With too small distance:
►Lower the level or observe the installation distances → 7.1.1 .
A tank adjustment can help improve the signal quality and ensures a higher
excess gain in difficult application conditions (foam, turbulence etc.).
In addition, a tank adjustment provides application reliability:
In the event of high interference, the unit rejects tank adjustment (error
message: [FAIL]). In such cases:
►Check the installation conditions; increase the installation distance / pipe
diameter.
7.2 Installation of the probe
The rod is not included in the scope of supply. It has to be ordered separately
(→ 3 Items supplied).
7.2.1 Installation of the rod
Do not damage the surfaces of the process connection and the rod.
►Use suitable tools with plastic surfaces.

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Fixing of the rod:
►Remove the protective cover / protective devices
from the unit and the rod.
►Slip the supplied O-ring onto the probe connection
of the unit or check its position.
►Screw the rod to the unit and tighten it.
Recommended tightening torque: 6.5 Nm.
8
►Check the O-ring for correct position. Replace if damaged.
Available accessories: www.ifm.com → New search → LR275x → Accessories.
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.
7.3 Shortening of the probe, determination of the probe length
The rod can be shortened to adapt the probe to different tank heights.
Ensure that the probe length is not below the minimum permissible probe
length of 150 mm (Lmin). The unit does not support probe lengths below
150 mm. If shorter probes are used, malfunction can occur.
For probe lengths < 250 mm no tank adjustment is possible (→ 7.1.2 Notes
on the tank adjustment).

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Proceed as follows:
►Screw the rod to the unit.
►Mark the desired length (L) on the rod. The
reference point is the lower edge of the process
connection.
►Remove the rod from the unit. Make sure that the
O-ring between the rod attachment piece and the
rod does not get lost.
►Shorten the rod.
►Remove all burrs and sharp edges. For hygienic
requirements: Restore the required surface quality.
If necessary, repolish.
Lmin
L
►Check the position of the O-ring / insert the O-ring again.
►Screw the rod to the unit again and tighten it. Recommended tightening torque:
6.5 Nm.
►Precisely measure the probe length L, note the value. It is needed for
parameter setting of the unit.
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.
7.4 Installation of the unit in the tank
Before installing and removing the unit: Make sure that no pressure is
applied to the system and that there is no medium in the tank that could
leak. Also always note the potential dangers related to extreme machine
and medium temperatures.

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The unit can be fixed to different process connections. Options are as follows:
1 Installation using an adapter with sealing ring (order no. E332xx / E333xx)
The adapters are supplied with EPDM O-ring (order no. E30054). More sealing rings
are available as accessories: FKM O-ring (order no. E30123);
On the installation process → Installation instructions enclosed to the adapter.
2 Installation using a welding adapter
• Order no. E30122
• Order no. E30130; adapter with leakage port
The adapters are supplied with EPDM O-ring (order no. E30054). More sealing rings
are available as accessories: FKM O-ring, order no. E30123.
On the installation process → Installation instructions enclosed to the adapter.
3 Installation on G1 flange (non hygienic)
The sealing ring on the sensor is used as process seal.
The upper sealing area on the process connection must be flush with the tapped hole
and have a surface characteristic of min. Rz 6.3.
►Grease the sensor thread with a suitable paste.
►Insert the unit into the process connection.
►Tighten it using a spanner. Tightening torque: 35 Nm.