The Masoneilan 12400 Series instrument is a two-wire, loop-powered level transmitter with HART® Communication that operates according to the fully proven buoyancy and torque tube principles. A change in liquid level varies the net weight of the displacer, increasing or decreasing the load on the torque tube by an amount directly proportional to the change in liquid level. The resulting rotation of the torque rod and attached magnets modifies the magnetic field surrounding a non-contact sensor, producing an analog signal proportional to the level in the vessel. This analog signal is converted into an error-free digital signal that is processed by the on-board micro-controller. After processing, the digital result is converted to a 4-20 mA analog output signal.
This sensing method is non-contacting and frictionless, and it provides total isolation between the sensed motion and sensor output.
Assessed By:IEC 61508 Certificate Assessment Report
Last Updated: Tue, March 02, 2021