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 forces a blade to oscillate at its fundamental frequency (referred to as natural resonance). When the blade comes into contact with the process medium, this dampens the oscillation; 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. In addition, the units can be programmed to sense high or low levels and failsafe high or low, with adjustable sensitivity to eliminate false switching.
As the damping effect (resistance to vibration) of low viscosity liquids is minimal, 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 used 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. In addition, extensive research has maximised the operational effectiveness of the fork to allow it to work with aerated liquids and slurries and to function even when coated with the product. Combined with the features and benefits listed above, this makes the TF Series switches an ideal solution for many liquid-level applications and level detection of free-flowing liquids. In addition, the switches will control filling and emptying functions and generate failsafe alarms to provide either overfill or empty tank protection. Users can extend the probes to 3 metres (10 feet). Plastic-coated versions are recommended for aggressive mediums, and highly polished versions are best suited for abrasive mediums.
