Lfp Level Sensor; Principle Of Operation; Safety Notes; Fields Of Application - Sick Lfp Inox Betriebsanleitung

EN
Operating instructions

1 LFP level sensor

1.1 Principle of operation

The LFP uses TDR (Time Domain Reflectometry) technology. This is a process to determine transit
times of electromagnetic waves. A low-energy, electromagnetic pulse is generated in the sensor's
electronic components, coupled to the mono-probe, and conducted along this probe. If this pulse
strikes the surface of the liquid to be measured, a portion of the pulse is reflected there and is
conducted back up along the probe path to the electronics, which then calculate the level based on
the time difference between the sent and the received pulse. The sensor can output this level as a
continuous measured value (analog output) and can also derive two freely positionable switching
points from it (switching outputs). IO-Link communication is also available for the switching output
(Q1).

1.2 Safety notes

Read the operating instructions prior to commissioning.
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This manual applies to devices with firmware version V4.00.
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Connection, mounting, and setting may only be performed by trained specialists.
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The LFP is not a safety module according to the EU Machinery Directive.
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Observe national safety and work safety regulations.
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Repairs may only be carried out by the manufacturer. Altering or tampering with the device is not
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permitted.
Wiring work and the opening and closing of electrical connections may only be carried out when
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the power is switched off.
The radiated power is far lower than that from telecommunication equipment. According to current
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scientific knowledge, operating the device is not considered to
pose any health risks.
Incorrect handling or improper use can lead to malfunctions in your application.
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1.3 Fields of application

The innovative TDR technology makes reliable and nearly application-independent level monitoring
possible. The LFP is suitable for continuous level monitoring as well as for point level detection in
nearly all liquids.
Changes in the properties of the liquids to be measured will not influence it. Due to its hygienic
design, it is suitable for universal use in all liquids in the food industry. The LFP can only be used in
metallic containers or metallic bypass systems. The use at media temperatures of up to 150°C as
well as CIP and SIP compatibility mean the device is completely food safe. This has been certified by
an EHEDG certificate and FDA conformity. A WHG certification is being prepared.
60 8014485/YE12/2014-08-20 © SICK AG • Level sensors • Germany • Subject to change without notice
1 LFP level sensor
LFP Inox