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Allison Engineering

Innovative Solutions for
Process Control

Level Transmitters & Gauges


AT100 Magnetostrictive transmitters

Magnetostriction is a Time-Of-Flight technology, much like ultrasonic or radar. It has been used for position monitoring for many years but has only become popular for liquid level measurement within the past decade. It uses an internal waveguide and a float with magnets inside. A current pulse travels down a waveguide and when its magnetic field interrupts the floats magnetic field they repel each other and a return shock wave travels back to the electronics. This enables us to calculate the distance from top connection to the float.

Key Features

  • ATEX Exd / Exia and SIL2 rated
  • Accuracy of +/- 1mm over 10 m length
  • Process temperature from -200 to + 400°C
  • Any length
  • Bulk level and interface level
  • See AT200 for non-contact version