MTF Series - Low-Cost Tuning Forks

Level switches for liquids

Hycontrol's MTF Series are simple yet highly effective vibrating level switch devices for liquids. A piezoelectric crystal is used to force a blade to oscillate at its fundamental frequency (also called natural resonance). When the blades come 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 MTF 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.

They are suitable for 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). 

The PNP/NPN transistor output versions can be connected directly to PLC systems or relay units. MTF vibrating forks are able to fulfil switching tasks of high-current loads with the help of Switching Isolators. The HYC-MTF-SI-E EExia Intrinsically Safe Switching Isolator is designed to serve the EExia-rated vibrating forks.


Product Highlights

  • No moving parts to wear
  • Little maintenance required

  • Low cost

  • 1” mounting suitable for pipes or tanks

  • Optional hygienic mounting for food industry use

  • Simple to install

  • Small fork size for minimal intrusion into vessel

  • Unaffected by environmental changes

  • Specific frequency avoids false switching

  • Bi-coloured LED shows status of the switch

  • 2-wire AC and 3-wire DC versions available

  • Magnetic test point

Technical Data

  • Product Length: 69mm - 3m
  • Liquid Viscosity: .2 to 10,000cps
  • Maximum Temperature: -40ºC to +130ºC
  • ATEX option: Yes