Level sensors

Tuning forks – tough and flexible in bulk


Your Benefits

  • Easy installation and commissioning, no pre-calibration necessary
  • Easy operation and integration
  • Maintenance-free system
  • Sensors can be tested while installed
  • Flexible, reliable measurement system suitable for many types of applications
  • Vertical mounting, even in difficult installation and ambient conditions


Tuning forks – tough and flexible in bulk


The rugged, reliable, and highly accurate vibrating level switches in the LBV300 product family signal full, empty, or demand states in bulk materials. The tuning fork reacts to changes in density, and thus operates independently of silo shape or the tank material used. The rugged stainless steel tuning fork is piezo-electrically energized and vibrates at its resonance frequency when it is covered by bulk materials. This change is detected and converted into a switching signal. While the LBV310 compact device is used for horizontal mounting and to signal full states, the LBV320 cable-extended switch and the LBV330 tube-extended switch are used for vertical mounting in silos and bridge sensing ranges of up to 80 m and 6 m respectively. With a wide variety of thread and flange connections, and several electronic variants, the LBV330 offers a solution for almost all applications, even in potentially explosive atmospheres.

At a glance
  • Tough device design
  • Several housing materials and electrical outputs available
  • Immune to deposit formation
  • Commissioning without filling
  • Process temperature up to 250 °C
  • Very high repeatability
  • ATEX versions (1D/2D/1G/2G) available
  • Tube-extended version (LBV330) up to 6 m and rope extensions version (LBV320) up to 80 m available for vertical mounting


Technical overview

  • Technical data overview

    Technical data overview

    Measurement principleVibrating level switch
    Detection principleContact
    MediumBulk solids
    Process temperature–50 °C ... +250 °C, detection of solids in water, Temperature range with temperature adapter
    Process pressure–1 bar ... 25 bar
    Output signal

    Non-contact switch

    Double relay (DPDT)

    1 x PNP/NPN

    NAMUR signal

    Accuracy of sensor element± 10 mm
All technical data can be found accompanying the individual product