Vibrating Level Switch Liquids TF series

SKU: TFseries

Manufacturer: Hycontrol

Vibrating level switches utilise a piezoelectric crystal to oscillate a blade at its fundamental frequency (also referred to as the natural resonance). When the blade of the probe comes into contact with the process media the natural frequency of oscillation is dampened; the electronics sense the change in frequency which causes the unit to switch.

pdf datasheet

Hycontrol's TF Series are simple yet highly effective vibrating level switch devices for liquids. They are unaffected by liquid conductivity, dielectric constant, viscosity, pressure or temperature, and can operate in a process temperature of up to 130°C (266°F). A piezoelectric crystal is used to force a blade to oscillate at its fundamental frequency (also referred to as natural resonance). When the blade comes into contact with the process medium the oscillation is dampened; the electronics sense the change in frequency which causes the unit to switch.

The electronic output options allow the user to switch a load on/off or to interface directly with a PLC. The units can be programmed to sense high or low level and failsafe high or low, with adjustable sensitivity to eliminate false switching.

As the damping effect (resistance to vibration) of low viscosity liquids is very small, Hycontrol's TF devices use two relatively wide blades to sense the presence of liquid levels. These blades can be short in length for minimal intrusion into the vessel, or for use in pipes.

The TF series' standard short forks offer many advantages to the user, enabling the switch to operate in small vessels or pipes with a minimum intrusion profile. Extensive research has maximised the operational effectiveness of the fork to enable it to operate with aerated liquids and slurries and to function even when coated with product. In combination with the features and benefits listed above, this makes the TF Series switches an ideal solution for a great many liquid level applications and level detection of free-flowing liquids. The switches can be used to control filling and emptying functions, as well as generating failsafe alarms to provide either overfill or empty tank protection. The probes can be extended up to a length of 3 metres (10 feet). Plastic coated versions are recommended in aggressive mediums, and highly polished versions are recommended for abrasive mediums.


  • No moving parts to wear
  • No maintenance required
  • 1” threaded (BSPP, NPT) connection as standard
  • Extended length options to 3 m
  • Choice of international flanges and range of hygienic fittings
  • Simple to install
  • Choice of 1 or 2 SPDT relays 250 V AC
  • Unaffected by environmental changes
  • Specific frequency avoids false switching
  • PFA coating option for chemical resistance
  • Highly polished option for hygienic applications
  • Continuous operating temperature up to 130°C (266°F)
  • Pressure up to 40 bar (580 psi)


Standard Length: 69 mm - 3 m
Liquid Viscosity: 0.2 to 10,000 cps
Maximum Temperature: -40ºC to +130ºC
ATEX Option: No