The Seli GmbH company, a top-ranking system vendor for manufacturers of food processing equipment, developed the SMW device - the very first digital fill level limit switch. Due to the considerable stresses to which the material is exposed during the processes, VICTREX® PEEK polymer was selected.
As a result of the exclusive use of pure VICTREX PEEK polymer for the sensors, the highest possible standard of safety for the food and pharmaceutical industries has been achieved because VICTREX PEEK polymer complies with the most stringent FDA requirements in every respect.
The sensor is exposed to extreme temperature and chemical conditions associated with corresponding plant operations as the VICTREX PEEK sensor heads are constantly in contact with the medium to be monitored. VICTREX PEEK’s excellent resistance to all common solvents, acids and bases as well as its outstanding mechanical properties such as tensile strength, bending, creep characteristics, and impact strength make it the perfect material for sensors.
The SMW capacitive fill level limit switch can be incorporated in the common process connections of the given industry (TriClamp, BioControl, Varivent, APV, DRD Flange, Milchrohr and Seli Socket System).
The sensor can be used to monitor filling levels in containers or pipelines, and as a limit switch, depending on the medium for phase separation.
The operating conditions are as diverse as the actual processes in which the fill level limit switch can be installed. The sensor’s continuous operation temperature ranges from -10°C to 150°C. VICTREX PEEK polymer resists temperatures of up to 260°C which is why the sensor can be exposed to prolonged sterilisation at approx. 150°C at up to 6 bar. Complete encapsulation of the sensor with VICTREX PEEK polymer eliminates the need for seals, thereby significantly extending the service life of the sensor.
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