IFM LR7009 User manual

Operating instructions
Electronic level sensor
LR7009
11421235 / 0001 / 2022
GB

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Contents
1 Preliminary note ............................................................. 4
1.1 Symbols used.......................................................... 4
2 Safety instructions............................................................ 5
3 Intended use................................................................ 6
3.1 Accessories............................................................ 6
3.2 Operation with single probe................................................ 7
3.3 Operation with coaxial probe............................................... 7
3.4 Application area ........................................................ 7
3.4.1 Restriction of the application area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Function ................................................................... 9
4.1 Measuring principle...................................................... 9
4.2 Display functions........................................................ 9
4.3 Switching function....................................................... 9
4.4 Offset for indicating the real level in the tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5 Probes for different tank heights............................................ 10
4.6 Safe state............................................................. 10
5 Installation.................................................................. 11
5.1 Device with single probe.................................................. 11
5.2 Device with coaxial probe................................................. 13
5.3 Installation of the probe................................................... 13
5.3.1 Installation of the rod................................................. 13
5.3.2 Installation of the coaxial pipe.......................................... 14
5.4 Shortening of the probe................................................... 14
5.4.1 Shortening of the rod and determination of its length L . . . . . . . . . . . . . . . . . . . . . . . 14
5.4.2 Shortening of the coaxial pipe.......................................... 14
5.4.3 Determination of the probe length L when coaxial probes are used . . . . . . . . . . . . . 15
5.5 Installation of the device with single probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.5.1 Installation in closed metal tanks (without flange plate) . . . . . . . . . . . . . . . . . . . . . . . 15
5.5.2 Installation in closed metal tanks (with flange plate) . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.5.3 Installation in open tanks.............................................. 17
5.5.4 Installation in plastic tanks............................................. 17
5.6 Installation of the device with coaxial probe in the tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.7 Alignment of the sensor housing............................................ 18
6 Electrical connection.......................................................... 19
7 Operating elements and display elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8 Menu...................................................................... 21
8.1 Menu structure ......................................................... 21
8.2 Explanation of the menu.................................................. 21
9 Parameter setting............................................................ 23
9.1 IO-Link ............................................................... 23
9.2 Parameter setting in general............................................... 23
9.3 Basic settings (on delivery)................................................ 25
9.3.1 Entering the probe length ............................................. 25
9.3.2 Setting to the medium................................................ 26
9.3.3 Entering the type of probe used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.4 Setting ranges.......................................................... 26
9.5 Configuring the display................................................... 27
9.6 Offset setting........................................................... 27
9.7 Setting the output signals................................................. 27
9.7.1 Setting the output function............................................. 27
9.7.2 Setting the switching limits (hysteresis function) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9.7.3 Setting the switching limits (window function) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9.7.4 Setting the switch-off delay............................................ 27
9.7.5 Setting the switching logic for the outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.7.6 Setting response of the outputs in case of a fault . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.7.7 Setting the delay time after signal loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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9.8 Resetting all parameters to factory setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.9 Changing basic settings .................................................. 28
9.9.1 Re-entering probe length ............................................. 28
9.9.2 Setting to another medium ............................................ 28
9.9.3 Changing the value of the type of probe used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10 Operation .................................................................. 30
10.1 Operating indicators ..................................................... 30
10.2 Reading the set parameters ............................................... 30
10.3 Changing the display unit in the Run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10.4 Error indications ........................................................ 30
10.5 Output response in different operating states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11 Repair, maintenance and disposal ............................................... 32
12 Applications ................................................................ 33
12.1 Minimum level monitoring with early warning and alarm . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12.2 Pumping station / empty the tank with overflow prevention . . . . . . . . . . . . . . . . . . . . . . . . 33
12.3 Storage tank........................................................... 34
13 Factory setting .............................................................. 36

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1 Preliminary note
You will find instructions, technical data, approvals and further information using the QR code on the
unit / packaging or at www.ifm.com.
1.1 Symbols used
Requirement
Instructions
Reaction, result
[...] Designation of keys, buttons or indications
Cross-reference
Important note
Non-compliance may result in malfunction or interference.
Information
Supplementary note

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2 Safety instructions
• The unit described is a subcomponent for integration into a system.
– The system architect is responsible for the safety of the system.
– The system architect undertakes to perform a risk assessment and to create documentation in
accordance with legal and normative requirements to be provided to the operator and user of
the system. This documentation must contain all necessary information and safety instructions
for the operator, the user and, if applicable, for any service personnel authorised by the
architect of the system.
• Read this document before setting up the product and keep it during the entire service life.
• The product must be suitable for the corresponding applications and environmental conditions
without any restrictions.
• Only use the product for its intended purpose (Ò Intended use).
• 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 or warranty for any consequences caused by tampering with
the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the product must be
carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.
• Only use the product for permissible media (Ò Technical data).
• The unit complies with the standard EN 61000-6-4 and is a class A product. The unit may cause
radio interference in domestic areas. If interference occurs, the user must take appropriate actions.

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3 Intended use
The device continuously monitors the level in tanks and generates output signals according to the
parameter settings.
2 switching outputs are available.
The outputs can be set separately.
In addition, the following is necessary for installation and operation:
• One rod (for operation of the device with single probe) Ò Accessories.
• Plus one coaxial pipe (for operation of the device with coaxial probe) Ò Accessories.
• Mounting material (if necessary, a launching plate) Ò Accessories.
3.1 Accessories
Only use accessories from ifm electronic gmbh. The function is not ensured when using
components from other manufacturers.
The following components are available as accessories:
Rods
Length (cm) Order number
15 E43225
24 E43203
30 E43226
45 E43204
50 E43227
70 E43205
100 E43207
120 E43208
140 E43209
160 E43210
Coaxial pipes with G¾ process connection
Length (cm) Order number
24 E43211
30 E43228
45 E43212
50 E43229
70 E43213
100 E43214
120 E43215
140 E43216
160 E43217

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Coaxial pipes with ¾“ NPT process connection
Length (cm) Order number
45 E43218
70 E43219
100 E43220
120 E43223
140 E43224
160 E43221
Flange plates
Size / process connection Order number
73 - 90 / G¾ E43201
65 - 80 / G¾ E43202
3.2 Operation with single probe
The single probe is made up of one individual rod and is suited for the detection of aqueous media, in
particular of heavily soiled aqueous media.
For the correct function with single probe, the device 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 accessories are not sufficient as launching plates. Only
use accessories indicated as "launching plate".
For installation in closed metal tanks, the tank lid serves as a launching plate. For installation in
open metal tanks, tanks made of plastic or metal tanks with plastic lids a sufficiently large fixing
plate, a metal plate or similar must be used.
For operation with single probe, minimum distances to tank walls, objects in the tank, bottom of
the tank and further level sensors must be adhered to.
3.3 Operation with coaxial probe
The coaxial probe is made up of an inner rod and an outer probe pipe (coaxial pipe). The rod is
centred in the coaxial pipe by one or several spacers.
In case of operation with a coaxial probe media with a low dielectric constant (e.g. oil and oil-based
media) are detected in addition to aqueous media.
No launching plate is required for operation with coaxial probe. Furthermore, no minimum
distances to tank walls and objects in the tank are required.
3.4 Application area
• Water, water-based media
• Oils, oil-based media (only for operation with coaxial probe)
Application examples:
• Detection of coolant emulsion in a machine tool.
• Detection of cleaning liquid in a parts cleaning system.
• Monitoring of hydraulic oil in a hydraulic power unit (only for operation with coaxial probe).

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3.4.1 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
(e.g. oil layer on water).
uCheck the function by performing an application test.
uInstallation in a steady area.
wIn case of signal loss, the device displays [E.033] and switches the outputs to a defined
state.
The device is not suitable for bulk materials (e.g. plastic granulates).
The device is not suitable for applications where the probe is subjected to permanent and high
mechanical stress (e.g. heavy movement of viscous media or fast flowing media).
When installed in plastic tanks, deterioration caused by electromagnetic interference may occur (noise
immunity to EN61000-6-2).
In case of operation with coaxial probe: not suitable for soiled or viscous media and media prone to
formation of deposit. Maximum viscosity: 500mPa.s.
• If the device is to be used in acids or alkalis, in hygienic areas or in electroplating applications:
uCheck the compatibility of the product materials with the media to be monitored.
• In case of operation with single probe:
uUse preferably in metal tanks.
uIn case of operation in small tanks (rod lengths shorter than 200 mm and less than 300 mm
distance to the tank wall), interference from the tank (resonances) may occur in rare cases.

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4 Function
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 while it is in operation.
Operation of the unit via the IO-Link interface requires an IO-Link master.
With a PC, suitable IO-Link software and an IO-Link adapter cable, communication is possible while
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.
4.1 Measuring principle
The device operates on the principle of guided wave radar. It measures the level using
electromagnetic pulses in the nanosecond range.
Fig.1: Transmitting
D
Fig.2: Receiving
The pulses are transmitted by the sensor head and guided along the rod (Fig. Transmitting). When
they hit the medium to be detected they are reflected and guided back to the sensor (Fig. Receiving).
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 figures show operation with single probe. In case of operation with a coaxial probe, the
guided wave runs only along the inside of the coaxial pipe.
4.2 Display functions
The device displays the current level, either in cm or in percent of the final value of the measuring
range. Factory setting: cm.
The display unit is defined by programming. In the Run mode, it can be temporarily switched between
length indication (cm) and percentage:
uBriefly press [Set].
wThe selected unit is displayed for 30 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.
4.3 Switching function
The device signals via two switching outputs (OUT1/OUT2) that a set limit value has been reached or
that the level is below the limit value. For each output the following switching functions can be
selected:
• Hysteresis function / normally open (Fig. Hysteresis function): [OUx] = [Hno].

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• Hysteresis function / normally closed (Fig. Window function): [OUx] = [Hnc].
First the switch point (SPx) is set, then the switch-off point (rPx) with the requested difference.
• Window function / normally open (Fig. Hysteresis function): [OUx] = [Fno].
• Window function / normally closed (Fig. Window function): [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.
SP
rP
Fig.3: Hysteresis function
L: level
HY: hysteresis
FE: window
t
L
FH
FL
1
0
1
0
FE
Fno
Fnc
Fig.4: Window function
L: level
HY: hysteresis
FE: window
For each switching output, a switch-off delay of max. 60 s can be set (e.g. for especially long pump
cycles).
4.4 Offset for indicating the real level in the tank
The zone 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.
4.5 Probes for different tank heights
The device can be installed in tanks of different sizes. Probes in different lengths are available. To
adapt to the tank height, each probe can be shortened. The minimum probe 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 device after installation.
4.6 Safe state
For each output, a safe state in the event of a fault can be defined.
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 the response of the outputs can be set via the parameters [FOU1], [FOU2].
Temporary loss of signal caused e.g. by turbulence or foam formation can be suppressed by a delay
time [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 device 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 safe state.
In case of heavy foam build-up and turbulence:
uNote the examples of how to create a steady area.