S.G. Frantz offers several optional accessories for L-1 Isodynamic® and LB-1 Barrier Laboratory Separators:

  • LFC-3 Low-Field Control
  • Vibrator Control
  • Regulated Power Supply
Model Lfc-3 Low-field Control


The Frantz Low-Field Control accessory (Model LFC-3) is designed for use with the Barrier or Isodynamic® Laboratory Separator models. It is installed in the electrical circuit that supplies direct current to the coils to create the conditions required for separating ferromagnetic materials according to differences in their magnetic properties.

The Control itself comprises means for:

  • Reversing the direction of the current to the separator’s coils
  • Sensing a near-zero field condition in its working space
  • Monitoring current from zero to about 100 milliamperes
  • Pulsing the current at selected frequencies, between selected values

The model LFC-3 is 8 inches high, 8-1/16 inches wide and 7-15/16 inches deep. Potentiometers, switches, fuses, and a 0-100 milliampere meter are mounted on its sloping control panel. A pilot light on the panel is connected to a reed switch attached to the magnet poles, which opens when the field approaches zero.


When the magnetic field in the working space of the separator has no current flowing, residual magnetization is high enough to cause ferromagnetic materials to agglomerate and stick in the chute. To eliminate this residual magnetization, the LFC-3 reverses the direction of the current.

Through a series of current reversals, a minor hysteresis loop is established and stabilized so the direction and strength of the current that results in a zero field condition in the working space of the separator may be recorded and repeated. Low-Field strengths in the 0-1000 gauss range can then be selected and any selected field intensity can be repeated.

Current can be pulsed between selected high and low values at selected frequencies in a range from about 3 to 30 hertz. When current is pulsed through the zero field value, the polarization of ferromagnetic particles reverses with each pulse, causing trees of ferromagnetic particles to collapse and release entrained particles.

As with paramagnetic and diamagnetic materials, the magnetic properties of some ferromagnetic materials are too similar for separation by magnetic means. With the Low-Field Control, however, the separator becomes highly sensitive to small differences in magnetic properties.

The electric requirements for the LFC-3 Low-Field Control accessory are 230/115V, 0.3/0.6A, and 50/60Hz.


Our LFC-3 Low-Field Control accessory is included with the sale of most model L-1 and LB-1 laboratory separators (unless the user does not perform separations of ferromagnetic and highly paramagnetic materials).


Vibrator Control

S.G. Frantz also offers a vibrator control (required for L-1 and LB-1 Laboratory Separators). This unit controls the vibration on the L-1 Laboratory Separator as well as the feed and chute vibration on the LB-1 Laboratory Separator. The unit is 8.5″ W x 9.25″ D x 4″ H and requires power at 115 V, .5 A, 50/60 Hz (a 230 V to 115 V Step-Down Transformer is available).


Vibrator Control

S.G. Frantz Laboratory Separators require a regulated power supply delivering 150V, 0-4A DC. The input for this power supply is 230/115 V, 6/11 a, 50/60 Hz.

Contact us today to learn more about S.G. Frantz or any of our Electromagnetic, Permanent Magnet, and/or Laboratory Separators.