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Vibrating Fork Level Switch

Vibrating level switches are used as overfill protection devices or low-level indicators in liquids as well as in granular and powdery bulk solids. The advantages Vibrating level switches are easy to install. Setup and commissioning is possible without medium.


The working principle of vibrating fork level sensor is based on vibrating a tuning fork sensor continuously at its natural frequency and detecting the change of frequency and amplitude in the presence of application media. The monitoring process of given parameters depends upon type of application media.

Fork sensors (slot sensors) are and L-shaped through-beam object detecting sensors that have the transmitter and receiver built into the opposing "fork" arms of the sensor housing. Fork sensors offer advantages over standard through-beam sensors in certain applications.


  • Supply voltage: 20…255 V AC, 20…60 V DC
  • Ambient temperature: −40…+70 °C
  • Process temperature: −40…+130 °C
  • Process pressure: up to 40 bar
  • Output: 1 or 2 relays (SPDT), 2-wire AC / DC, transistor (PNP, NPN)
  • Process connection: 1", 1½", 2" or flanges or hygienic fittings
  • Ingress protection: IP67, IP68, IP65
  • Approvals: ATEX, IEC Ex, DNV (Marine), UKCA Ex
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