IFM LT80 Series Manuale utente
Operating instructions
Electronic level and
temperature sensor
LT80xx
80264357 / 00 05 / 2019
UK
2
Contents
1 Preliminary note...................................................................................................4
1.1 Symbols used ................................................................................................4
2 Safety instructions ...............................................................................................5
3 Functions and features ........................................................................................6
3.1 Application area ............................................................................................6
3.2 Restriction of the application area ................................................................6
4 Getting started .....................................................................................................6
4.1 Example configuration 1 ................................................................................7
4.2 Example configuration 2 ................................................................................8
5 Function...............................................................................................................9
5.1 Measuring principle level ...............................................................................9
5.2 Measuring principle temperature .................................................................10
5.3 Operating principle / features of the unit......................................................10
5.3.1 Operating modes ................................................................................ 11
5.3.2 Notes on the integrated overflow prevention ......................................12
5.3.3 Display and switching functions..........................................................12
5.3.4 Offset for indicating the real level in the tank......................................14
5.3.5 Defined state in case of a fault ...........................................................14
5.3.6 Extreme value memory.......................................................................14
5.3.7 IO-Link ................................................................................................14
6 Mounting............................................................................................................15
6.1 Notes on installation instructions for operation with overflow prevention ...16
6.2 Installation instructions for operation without overflow prevention ..............17
6.2.1 Installation in the inactive zone...........................................................17
6.2.2 Installation in the active zone of the probe .........................................18
6.3 Other installation notes................................................................................19
6.3.1 Marking of the installation height .......................................................19
7 Electrical connection..........................................................................................20
8 Operating and display elements ........................................................................22
9 Menu..................................................................................................................23
9.1 Menu............................................................................................................23
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10 Parameter setting ............................................................................................24
10.1 Parameter setting in general .....................................................................24
10.2 Basic settings ...........................................................................................25
10.2.1 Assign process values to the outputs [SEL3] / [SEL4]......................25
10.2.2 Assign process value to the display [SELd]......................................25
10.2.3 Define unit of measurement for level [uni.L] .....................................26
10.2.4 Set the unit of measurement for the temperature [uni.T]..................26
10.2.5 Set the offset [OFS] ..........................................................................26
10.2.6 Set the medium [MEdI] .....................................................................26
10.2.7 Set the overflow prevention [OP]......................................................27
10.2.8 Adjust the overflow prevention [cOP]................................................28
10.3 Setting of output signals ............................................................................29
10.3.1 Set output function [oux] für OUT1...OUT4 ......................................29
10.3.2 Define the switching limits [SPx] / [rPx] (hysteresis function) ...........29
10.3.3 Define switching limits [FHx] / [FLx] (window function).....................30
10.3.4 Set set delay [dSx] ...........................................................................30
10.3.5 Set reset delay [drx] .........................................................................30
10.3.6 Define switching logic [P-n] .............................................................30
10.3.7 Define response of the outputs in case of a fault [FOUx] .................30
10.3.8 Configure display [diS]......................................................................31
10.3.9 Reset all parameters to factory settings [rES] ..................................31
11 Notes on parameter setting via IO-Link ...........................................................31
12 Operation.........................................................................................................32
12.1 Operating indicators ..................................................................................32
12.2 Read the set parameters ...........................................................................32
12.3 Read / reset extreme value memory temperature .....................................33
12.4 Fast selection level / temperature..............................................................33
12.5 Error indications.........................................................................................33
12.6 Output response in different operating states............................................34
13 Technical data..................................................................................................34
13.1 Setting values [OFS]..................................................................................34
13.2 Setting ranges switching limits for level ....................................................34
13.3 Setting ranges switching limits for temperature.........................................35
13.4 Setting values [OP]....................................................................................35
13.5 Calculation aids [OP] .................................................................................36
13.5.1 Definition "from the cover“ ................................................................36
4
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.
CAUTION!
Warning of personal injury
Slight reversible injuries may result.
13.5.2 Definition "from the bottom“..............................................................36
14 Maintenance / cleaning / change of medium ..................................................37
14.1 Maintenance information for operation without overflow prevention .........37
15 Factory setting .................................................................................................38
16 Applications......................................................................................................39
16.1 Storage tank ..............................................................................................39
16.2 Pumping station.........................................................................................40
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2 Safety instructions
• The device described is a subcomponent for integration into a system.
- The manufacturer of the system is responsible for the safety of the system.
- The system manufacturer undertakes to perform a risk assessment and to
create a 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
manufacturer 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 (→ Functions and features).
• Only use the product for permissible media (→ Technical data).
• 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 unit
must be carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.
• 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 actions.
6
3 Functions and features
3.1 Application area
The unit was especially designed to meet the requirements of machine tool
building. It is especially suitable for monitoring coolant emulsions (also dirty) as
well as cutting and hydraulic oils.
The unit monitors 2 process values: level and temperature.
3.2 Restriction of the application area
• The unit is not suitable for
- acids and alkalis
- hygienic and electroplating applications
- highly conductive and adhesive media (e.g. glue, shampoo)
- granulates, bulk material
- use in grinders (increased risk of formation of deposits).
• It is possible that foam of good conductivity is detected as level.
►Test proper functioning in an application test.
• For water and hydrous media with temperatures > 35 °C, install the unit in a
climatic tube (→ Accessories).
• For automatic medium detection (→ 5.3.1):
For media which are very inhomogeneous, separate from each other and thus
forming separation layers (e.g. oil layer on water), the following applies:
►Test proper functioning in an application test.
4 Getting started
For fast set-up, the example configurations described in the following can be used
for most applications. The indicated minimum distances apply exclusively to each
separately described case.
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4.1 Example configuration 1
Unit LT8022 (probe length L= 264 mm)
Medium to be detected Mineral oil
Operating mode Manual media selection with overflow prevention
(Factory setting → 5.3.1
Installation environment Metal tank, installation to Fig. 4-1
►Install unit.
►Observe the distances (x), (u) and (c):
Fig. 4-1
OP
c
x: min. 4.0 cm
u: min. 1.0 cm
c: max. 14.0 cm
►Ground sensor and tank via an electrical
connection (→ 7).
►Observe the parameter setting sequence:
- [MEdI] = [OIL.2] (→ 10.2.6)
- [OFS] = (u); e.g. (u) = 2.0 cm (→ 5.3.4)
- [OP]: Set the overflow prevention OP at a
distance (y) greater than 4.5 cm below the
mounting element.
For distances (y) smaller than 4.5 cm there
may be malfunctioning and error messages
during the adjustment process [cOP].
Step increment and setting range: (→ 13.4).
Calculation aids for [OP]: (→ 13.5).
►Adjustment of the overflow prevention OP to [cOP] (→ 10.2.8).
> The unit is ready for operation.
►Make further settings if necessary.
►Check whether the unit operates correctly.
8
4.2 Example configuration 2
Unit LT8023 (probe length L= 472 mm)
Medium to be detected Coolant emulsion
Operating mode Automatic medium detection (→ 5.3.1)
Installation environment Metal tank, installation to Fig. 4-2.
►Install unit.
►Observe the distances (x), (u) and (c):
x: min. 4.0 cm
u: min. 1.0 cm
c: max. 23.0 cm
►Ground sensor and tank via an electrical
connection (→ 7).
►Observe the maximum permitted level (b).
A distance (a2) greater than 5.0 cm must be
observed between maximum level (b) and
mounting element.
►Observe the parameter setting sequence:
- [MEdI] = [Auto] (→ 5.3.4)
- [OFS] = (u); e.g. (u) = 1.0 cm (→ 5.3.4)
- [SP1] = Set the switch point at a distance (a2)
Fig. 4-2
c
bu a2
x
Switch points [SP3] and [SP4] can be used to control the medium
temperature and to set limit values for early warning / alarm.
►Unit must be reinitialised:
►Switch the operating voltage off and on again.
> The unit is ready for operation.
►Make further settings if necessary.
►Check whether the unit operates correctly.
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5 Function
5.1 Measuring principle level
The sensor determines the level according to the capacitive measuring principle:
• An electrical field [E] is generated
and influenced by the medium to be
detected. This change to the field
causes a measurement signal that
is electronically evaluated.
• The dielectric constant of a medium
is important for its detection. Media
with a high dielectric constant
(e.g. water) generate a strong
measurement signal, media with a
low dielectric constant (e.g. oils) a
correspondingly lower signal.
• The active measurement zone of
the sensor probe is composed of
16 capacitive measuring segments.
They generate measurement
signals depending on the degree of
coverage.
Fig. 5-1
A II
E
I: Inactive zone
A: Active zone (16 active segments)
E: Electrical field
Dimensions → Technical data sheet
10
5.2 Measuring principle temperature
The temperature is detected by a Pt element at the lower end of the probe and
electronically evaluated.
• Media without water content (e.g. oils) are directly (in contact with the medium)
detected.
• Hydrous media can also be directly detected up to temperatures of 35 °C.
For temperatures > 35 °C a climatic tube has to be installed for use in
hydrous media (→ 3.2). That means that temperature detection is indirect
(not in contact with the medium).
If a climatic tube is used, considerably increased response times have to
be expected.
5.3 Operating principle / features of the unit
The unit can be installed in tanks of different sizes. Observe the notes on
installation.
4 outputs are available. They can be set separately.
OUT1 Switching signal for level limit value / IO-Link
OUT2 Switching signal for level limit value
OUT3
OUT4
Switching signal for level limit value
or
Switching signal for temperature limit
To adapt to the present application select the required operating mode.
Questo manuale è adatto per i seguenti modelli
3
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