The Level Switch LBFS is designed to detect levels in tanks (max/min), for media separation, and provide empty-pipe detection or dry-run protection for pumps.
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The principle of operation of the sensor is based on a high frequency sweep signal radiated from the sensor, which, after reflection from the metal wall of the tank, returns back to the sensor. The media will act as a virtual capacitor, which together with a coil in the sensor head, will form a circuit creating the switch point signal. This virtual capacitance will depend of the di-electric value DK (Dielectrical Constant) of the media. If the signal reaching the receiver is below the set contact release threshold, the sensor informs about no medium present. The LBFS 4101 sensor can be configured using the FlexProgrammer 9701 communicator or the "teach-in" function.
The Flex-software has a zoom function for precise calibration of the sensor sensitivity and a time delay function depending on the specific properties of the medium or application. The sensor is highly sensitive regardless of its mounting position. For unstable or heterogeneous media which contain air, are foaming, highly condensing or sticky, specific sensor sensitivity calibration can be performed. The LFFS sensor switch can work with liquid media of various consistency, e.g. water, beer, milk, honey, yogurt, kechup, toothpaste or with loose media such as sugar, flour, groats, plastic granules, etc.
The LFFS switch sensor is resistant to various aggressive media (housing made of acid-resistant steel and tip made of PEEK). Galvanic corrosion is practically non-existant, as the measuring signal is emitted in the form of high frequency alternating current. PNP or NPN (NO/NC) output
The threaded connection can be sealed with widely available Teflon tape.