IFM Electronic LI2241, LI2242, LI2243 Operating Instructions Manual

Page 1
Operating instructions
Binary leakage sensor
LI224x
UK
706128 / 00 06 / 2012
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Contents
1 Preliminary note � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
1�1 Symbols used� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
2 Safety instructions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
3 Functions and features � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
3�1 Applications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4 3�2 Restriction of the application area � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
4 Function � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
4�1 Measuring principle � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4 4�2 Features of the unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
5 Installation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
5�1 Installation location / environment � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5 5�2 Mounting� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6 5�3 Set the installation depth � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
6 Electrical connection� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
7 Operating and display elements � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
8 Settings� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
8�1 Set to the empty vessel � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8 8�2 Set to the full vessel � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8 8�3 Lock / unlock the unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
9 Operation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
10 Maintenance, repair, disposal� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
11 Scale drawing � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
12 Technical data� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
Note on approvals to WHG:
The unit described here has been approved to WHG (Federal Water Act, Federal Act applicable in the Federal Republic of Germany)�
For more detailed provisions and information on the approval to WHG please see the German operating instructions�
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1 Preliminary note
1.1 Symbols used
Instructions > Reaction, result […] Designation of pushbuttons, buttons or indications Cross-reference
Important note Non-compliance can result in malfunction 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 complies with the standard EN 61000-6-4� The unit may cause radio interference in domestic areas� If interference occurs, the user must take ap­propriate remedial actions�
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3 Functions and features
The unit monitors collection chambers, basins or systems as well as inspection chambers and feeder chutes for the leakage of liquids�
3.1 Applications
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!
Maximum tank pressure: ± 0�5 bar (when mounted using the appropriate
mounting accessories; → 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 leakage is detected and indicates this by a switched signal�
Leakage detected output open (OFF) No leakage detected output closed (ON)
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� Media are only detected when the active zone (A) is covered�
4.2 Features of the unit
Automatic adjustment function to the medium to be detected by programming buttons (→ 8 Settings). This allows reliable detection of media with a low di-
electric constant (e�g� oil)�
Response level selectable by the installation length (→ 5.3).
The unit is virtually immune to almost any kind of build-up on the probe� The position of the switching level within the active zone can however change with build-up�
Operating and switching status indication via LED ring�
5 Installation
5.1 Installation location / environment
Installation of the unit: vertical from the top (→ 5.3).
The following minimum distances must be adhered to:
– Distance tank bottom - end of the probe: 5 mm�
– Distance metal tank wall - probe: 20 mm�
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5.2 Mounting
The unit is mounted using a mounting clamp or an adapter� The following standard mounting accessories are available:
Order no� Material
E43000 mounting clamp (for non-pressurised tanks) E43001 flange plate 73-90 with clamp adapter (pressure rating of 0�5 bar) E43002 welding adapter with clamp adapter (pressure rating of 0�5 bar) E43003 mounting adapter G¾ with clamp adapter (stainless steel, pressure rating of 0�5 bar) E43004 mounting adapter G1 with clamp adapter (stainless steel, pressure rating of 0�5 bar) E43005 flange plate 100-125 with clamp adapter (aluminium, pressure rating of 0�5 bar) E43006 flange plate 65-80 with clamp adapter (aluminium, pressure rating of 0�5 bar) E43007 flange plate 54 - 52x52 with clamp adapter (aluminium, pressure rating of 0�5 bar) E43016 mounting clamp with mounting bracket (for non-pressurised tanks) E43019 mounting adapter G¾ with clamp adapter (brass, pressure rating of 0�5 bar)
Further accessories on request�
5.3 Set the installation depth
S
A = response level
H = tank height
L = probe length
L1 = installation depth
L2 = extension length
L3 = mounting length (min�: 60 mm)
M = height mounting adapter
MET = max� immersion depth
(Active zone) = 31 mm
S = height of the boss
► 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 + S�
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 (→ 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:
3
1
4
2
L
+
L
1
4
3
Pin1 = L+
Pin4 = switching output/ NC
Pin3 = L-
core colours of ifm sockets: 1 = BN (brown), 3 = BU (blue), 4 = BK (black)
7 Operating and display elements
 
1: LED ring green / yellow
● green: leakage detected / output open (OFF)
● yellow: no leakage detected / output closed (ON)
2: programming button OUT OFF
3: programming button OUT ON
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8 Settings
Before the first set-up the empty adjustment must be carried out�
8.1 Set to the empty vessel
This adjusts the unit to both the empty collection basin and the installation condi­tions (e�g� the set installation length)� Previous settings are deleted�
► Ensure that the collection basin / vessel is empty�
► Press the programming button (OUT ON) for at least 2 s�
> The yellow LED flashes slowly (approx� 1 Hz) (= unit is in
the adjustment mode)�
> After the adjustment process the yellow LED is lit con-
tinuously (= unit is in the operating mode, sensor zone not covered)�
8.2 Set to the full vessel
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 collection basin until the active zone of the unit is covered�
► Press the programming button (OUT OFF), keep it
pressed for at least 6 s�
> The yellow LED flashes, after 6 s rapidly (approx� 2 Hz),
(= device is in the adjustment mode)�
> After adjustment the green LED is lit continuously (= unit
is in the operating mode, sensor zone covered)�
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8.3 Lock / unlock the unit
The unit can be locked electronically to prevent unintentional settings�
Locking
► Press both setting buttons simultaneously for 10 s in the operating mode� > The LED flashes green� > After the time (> 10 s) has elapsed, the colour of the LED changes from green
to yellow (flashing) and the unit is locked�
Unlocking
► Press both setting buttons simultaneously for 10 s in the operating mode� > The LED continues to indicate the current operating status (no reaction of the
LED)�
> After the time (> 10 s) has elapsed, the LED flashes green and the unit is
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 status / function
green unit ready for operation, sensor zone covered (output open (OFF))
yellow unit ready for operation, sensor zone not covered (output closed (ON))
10 Maintenance, repair, 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 has to 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�
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11 Scale drawing






Dimensions in mm
1: programming buttons; A: active zone (31 mm) L: probe length in mm: 132 (LI2241) 273 (LI2242) 481 (LI2243)
12 Technical data
Operating voltage[V] ������������������������������������������������������������������������������������������������������������������������ 10���36 DC
Current rating [mA] ������������������������������������������������������������������������������������������������������������������������������������� 200
Short-circuit protection (pulsed); protected against reverse polarity and overload
Current consumption [mA] ������������������������������������������������������������������������������������������������������������������������� < 22
Voltage drop [V] ���������������������������������������������������������������������������������������������������������������������������������������� < 2�5
Dielectric constant medium ���������������������������������������������������������������������������������������������������������������������� > 1�8
Max� tank pressure [bar] �������������������������������������������������������������������������������������������������������������������������� ± 0�5
1)
Housing materials ���������������������������������������������������������������������������������������������������������� PP-GF orange; TPE-U
Material (wetted parts) ���������������������������������������������������������������������������������������������������������������������������������� PP
Protection rating ��������������������������������������������������������������������������������������������������������������������������� IP 65 / IP 67
Protection class ���������������������������������������������������������������������������������������������������������������������������������������������� II
Ambient temperature [°C] ������������������������������������������������������������������������������������������������������������������������� 0���60
Medium temperature oil [°C] ���������������������������������������������������������������������������������������������������������������������0���65
Medium temperature water and media similar to water [°C] �������������������������������������������������������������������� 0���35
Storage temperature [°C] ������������������������������������������������������������������������������������������������������������������� -25 ��� 80
Shock resistance [g] �������������������������������������������������������������������������������������� 12 (DIN EN 60068-2-29, 11 ms)
Vibration resistance [g] ���������������������������������������������������������������������������� 5 (DIN EN 60068-2-6, 10���2000 Hz)
EMC ������������������������������������������������������������������������������������������������������������EN 61000-6-2 : 2005 + Corr� 2005
EN 61000-6-4: 2007
1)
when mounted using pressure-resistant mounting accessories (→ 5.2)
More information at www�ifm�com
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