LI5045 - Level sensor IFM - Free user manual and instructions

Brand	IFM
Model	LI5045
Product type	Capacitive level sensor
Dimensions (L)	273 mm
Active zone	25 mm (radial detection)
Weight	Approx. 120 g
Supply voltage	10 ... 36 V DC
Max. output current	250 mA
Main functions	Level detection of aqueous liquids, N.O./N.C. output (selectable by wiring), LED indicators (green, yellow, red)
Maintenance and cleaning	Clean the probe if deposits affect switching; check installation height
Safety	IP67 protection, Class II, protection against short circuits, reverse polarity, and overload
Spare parts and repairability	Repair by manufacturer; mounting accessories available (E43000 - E43007)
Ambient temperature	0 ... +80 °C
Fluid temperature	0 ... +35 °C
Max. tank pressure	0.5 bar (with mounting accessories)
Switching frequency	5 Hz

Frequently Asked Questions - LI5045 IFM

What types of fluids can the LI5045 detect?

The LI5045 is designed for aqueous liquids such as irrigation and lubrication liquids. It is not suitable for oils, powdery fluids, acids, or alkalis.

How to install the sensor?

Mount the device vertically from the top in a metal tank. Use ifm mounting accessories (E43000 - E43007). The minimum distance between the active zone and the wall/bottom must be 20 mm.

What is the required supply voltage?

The supply voltage must be between 10 and 36 V DC. Consumption is less than 13 mA at 24 V DC.

How to electrically connect the LI5045?

Connection must be carried out by an electrician. The wiring diagram is in the manual: the wires of the ifm female connector are colored (see manual). The output can be N.O. or N.C. depending on wiring.

What do the LEDs mean?

Green LED: device operational. Yellow LED: output switched. Red LED: function check (near threshold). Flashing yellow+red: short circuit. Flashing red: internal fault.

What to do if the red LED stays on permanently?

This indicates non-optimal working conditions (e.g., deposits on the probe). Clean the device or check the installation height.

Can I use the sensor in a plastic tank?

Use in plastic tanks is not recommended because insufficient electrical contact with ground may cause operational faults.

What is the minimum distance between two LI5 sensors?

The distance between the axes of two LI5 probes must be at least 40 mm. For an LI5 sensor and an LKxxxx, the minimum distance is 60 mm.

Is the sensor delivered ready for use?

Yes, the device is factory set and immediately operational. The programming button is electronically locked; no adjustment is needed.

How to clean the sensor?

In case of deposits, gently clean the probe with a soft cloth and a mild detergent. Avoid solvents that could damage the polypropylene.

USER MANUAL LI5045 IFM

Operating instructions

Notice utilisateurs

Kapazitiver

Niveauschalter

Capacitive level switch

1. Function and features 9
2. Installation . page 10
3. Electrical connection page 11
4. Installation and set-up / operation 12
5. Technical data page 13

Contenu

1 = BN(braun), 3 = BU(blau), 4 = BK(schwarz).

1. Function and features

Applications:

The unit was specially designed to meet the requirements of machine tool building. It is specially suitable for monitoring coolant emulsions as well as other hydrous media.

The unit is virtually immune to build-up of almost any kind on the probe (e.g. particles of metal, foam).

The sensor is not suitable for oils, granulates and bulk materials, acids and alkalis. It is not suitable for food and electroplating applications.

In case of doubt ensure the correct function by performing a test in your application.

Description of the function

The sensor detects the level of media in tanks.

• The unit detects by direct contact with the medium whether the requested level is reached and indicates this by a switched signal (N.O. or N.C., programmable by wiring; page 11).

	level reached level n	pt reached
N.O.	output = ON output	= OFF
N.C.	output = OFF output	= ON

• The level is determined by the installation length ( page 10, Installation).
• The unit is preset at the factory and is immediately ready for operation if used correctly. On delivery the programming button is electronically locked. Programming or adjustment are not necessary!
• Installation: vertical from the top.

The unit operates with radial detection characteristics. Therefore media below the active zone are not detected in the case of vertical installation. Media are only detected when the active zone is covered.

2. Installation

A = response level

H = height of the tank

SH = height of the neck

L = probe length (probe)

L1 = installation length

L2 = outside length

L3 = mounting length

MET = maximum immersion depth (= active zone, 25mm)

Mount the unit vertical from the top.

Mounting length (L3): minimum 60mm.

For safe and easy mounting use the ifm mounting accessories (Order no. E43000 - E43007).

Maximum vessel pressure when mounted with mounting accessories: 0.5bar.

• The units should be used in metal tanks.

Use in plastic tanks is not recommended. When the unit is used in plastic tanks, malfunctions may occur because the electrical contact of the medium to the machine ground may be insufficient.

• The distance between the active zone and the wall/bottom of the metal tank must be min. 20mm .
• When several LI5 units are mounted in one tank minimum distances between them must be maintained: 40mm from the centreline of a probe to the centreline of another probe.
• Distance between sensors type L15xxx and LKxxxx: min. 60mm from the centreline of a probe to the centreline of another probe.

3. Electrical connection

The unit must only be connected by an electrician.

The national and international regulations for the installation of electrical equipment must be observed.

Disconnect power before connecting the unit,

$$ (\text {一} = \quad N. O. 4 \quad / \quad = \quad N. C.) $$

Core colours of ifm sockets:

1 = BN(brown) , 3 = BU(blue) , 4 = BK(black) .

4. Installation and set-up / operation

After mounting and wiring check whether the unit operates correctly. Empty and fill the tank and check whether the unit switches correctly and whether the LED's correctly indicate the operations.

Display by LEDs:

LED green lights unit is ready for operation
LED yellow lights the output has switched
LED's yellow and red flash quickly (2Hz)	short circuit of the switching output
LED red lights function check
LED red flashes quickly (2Hz) in internal fault or unit damaged

Function check

The red LED indicates no malfunction of the unit, it indicates that the internal sensor signal is near the switching threshold.

2 cases can be distinguished:

• Normal operation/safe operation

The red LED is lit temporarily when the level of the medium approaches the response level or falls below the response level.

• Warning of possible malfunction

If the red LED is lit continuously, the operating conditions are no longer optimum.

It is for example possible that build-up of dirt on the probe has changed the switching level within the active zone.

You can take preventive measures to avoid a malfunction. Check for example the installation height or clean the unit.

5. Technical data

Operating voltage [V]	10 ... 36 DC
Current rating [mA]	250;Short-circuit protection;Reverse polarity protection / Overload protectionVoltage drop [V] < 2.5Current consumption [mA]	< 13 (24V DC)Switching frequency [Hz]	5
Maximum vessel pressure [bar]	0.5(when mounted with mounting accessories)
Housing material	PP (polypropylene); TPE/VMaterials (wetted parts) PP (polypropylene)
Operating temperature [°C]	0 ... +80Medium temperature [°C] 0 ... +35Protection IP 67, IIEMCIEC 1000-4-2 / EN 61000-4-2: 15kV air discharge / 8kV contact dischargeIEC 1000-4-3 / EN 61000-4-3: 10V/m, 80 ... 1000MHzIEC 1000-4-4 / EN 61000-4-4: 2kV coupling pliersIEC 1000-4-6 / EN 61000-4-6: 10V, 0.15 ... 80MHzIEC 255-5: 1kV

1 = BN(brun), 3 = BU(bleu), 4 = BK(noir).