IFM Electronic efector160 LI51 User manual

Operating instructions
Binary level sensor
LI51
704367 / 02 02 / 2013
UK
Tel:
+44
(0)191 490 1547
Fax: [phone]
Email: [e-mail]
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

2
Contents
1 Preliminary note....................................................................................................3
1.1 Symbols used.................................................................................................3
2 Safety instructions ................................................................................................3
3 Functions and features.........................................................................................4
3.1 Application area..............................................................................................4
3.2 Restriction of the application area ..................................................................4
4 Function................................................................................................................4
4.1 Measuring principle ........................................................................................4
4.2 Features of the unit ........................................................................................5
4.3 Application examples......................................................................................6
5 Installation ............................................................................................................6
5.1 Installation location / environment ..................................................................6
5.2. Installation procedure ....................................................................................7
5.3 Set the installation length ...............................................................................8
6 Electrical connection.............................................................................................9
7 Operating and display elements...........................................................................9
8 Settings...............................................................................................................10
8.1 Carry out the basic teach empty state..........................................................10
8.2 Carry out the basic teach full state ...............................................................10
8.3 Set the deposit suppression (option)............................................................ 11
8.4 Lock / unlock the unit.................................................................................... 11
9 Operation............................................................................................................ 11
10 Maintenance, repair and disposal.....................................................................12
11 Technical data and scale drawing.....................................................................12

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1 Preliminary note
1.1 Symbols used
►Instruction
> 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
• Please read the product description 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.
• Installation, electrical connection, set-up, operation and maintenance of the
unit must only be carried out by qualified personnel authorised by the machine
operator.
• The unit conforms to the standard EN 61000-6-4. The unit may cause radio
interference in domestic areas. If interference occur, the user must take ap-
propriate remedial actions.

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3 Functions and features
The unit monitors the level of liquids in tanks.
3.1 Application area
• Water, hydrous media, oils, coolant emulsions.
3.2 Restriction of the application area
• The unit is not suitable for acids, alkalis, granulates, bulk materials.
• It is not suitable for hygienic areas.
• Highly conductive foam can trigger a switching operation. Check the conse-
quences by performing a test in your application!
• For water and hydrous media with temperatures > 35° C install the unit in a
climatic tube (order no. E43100 ... E43103).
• 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 > 1.8 are safely detected.
Dielectric constants of common liquids
mineral oil ≈2
coolant emulsion ≈25...75
glycol ≈37
water ≈80
water, demineralised ≈30
Electrically conductive and non conductive media are detected.

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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
• 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.
• 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).
• Levelselectablebytheinstallationlength(→5.3).
• 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.
• Operating and switching status indication via LED ring.

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4.3 Application examples
1 2 3
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
• 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 probe 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.

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5.2. Installation procedure
The unit is mounted using a mounting clamp or an adapter. The following standard
mounting accessories are available:
Order no.
•mounting clamp (for non-pressurised tanks)...............................................................E43000
•mounting clamp with mounting bracket (for non-pressurised tanks)...........................E43016
•flange plate with clamp adapter (pressure rating of 0.5 bar).......................................E43001
•welding adapter with clamp adapter (pressure rating of 0.5 bar) ................................E43002
•mounting adapter G¾ with clamp adapter (stainless steel, pressure rating of 0.5 bar) ..........
E43003
•mounting adapter G1 with clamp adapter (stainless steel, pressure rating of 0.5 bar) ...........
E43004
•mounting adapter G¾ with clamp adapter (brass, pressure rating of 0.5 bar)............E43019
Further accessories on request.

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5.3 Set the installation length









A = response level
H = tank height
SH = height of the connection piece
L = probe length
L1 = installation length
L2 = extension length
L3 = mounting length (at least 60 mm)
MET = maximum installation depth (= active zone; 31 mm)
►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) + ½ MET + SH.
The unit switches when the level reaches the MET zone. The exact position
(exact response level) depends on the following factors:
• characteristics of the medium.
• installation conditions.
• adjustmentoftheunit(→chapter8Settings).

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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.
►Disconnect power.
►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
•green: operation display
•yellow: switching status indication
2: programming button OUT OFF
3: programming button OUT ON

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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.
►Empty the tank until the medium is at least 20 mm below the end of the probe.
►Press [OUT OFF], keep it pressed for min. 2 s / max. 6 s.
> 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:
►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.
►Fill the tank until the active zone of the unit is covered.
> IftheunitissetasNOunit(→8.1),theyellowLEDlights,ifitissetasNCunit,
it goes out.
►If the unit is set as NO unit: press [OUT ON] and keep it pressed for at least
6 s.
> 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.

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8.3 Set the deposit suppression (option)
This setting largely suppresses deposits in the tank and on the probe. Previous
settings are not changed.
►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.
►If the unit is set as NO unit: press [OUT OFF] and keep it pressed for at least
6 s.
> The yellow LED flashes slowly, after 6 s it flashes quickly. When the button is
released, it goes out.
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.
►Press both setting pushbuttons simultaneously for at least 10 s in the operating
mode.
> 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:
LED green LED yellow
unit ready for operation, output closed OFF ON
unit ready for operation, output open ON OFF

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10 Maintenance, repair and disposal
Recommended maintenance:
►Check the probe for build-up from time to time, clean it in case of strong soiling.
After removal of the unit or a change of media with dielectric constants
that 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
Tel:
+44
(0)191 490 1547
Fax: [phone]
Email: [e-mail]
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

13
UK