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The MTII4300 precisely senses the position of the Magnicator float by applying a short 1.5μs pulse to the sensing element. This pulse creates a magnetic field around the sensing element. When the float’s magnetic field and the sensing element’s magnetic field intersect, a twist occurs in the sensing element. Based on the time between the initial pulse and the detection of the corresponding twist, the location of the float magnet can be precisely calculated.
The RST2 sensor is a chain of magnetic reed switches and resistors mounted within a heavy wall stainless steel tubing assembly. As the float within the Magnicator responds to liquid level change in the chamber, the float actuates adjacent reed switches. The reed switch and resistors provide a varying resistance output. It is this output that is measured by the RST2 electronics module, as an indication of liquid level. The RTS2 transmitter will provide a 4-20 mA signal proportional to the liquid level indicated by the Magnicator.
The switch mechanism is based on a unique Jerguson tri-magnet design where the snap action is accomplished by the utilization of magnetic repulsion. The magnet mounted in the float causes the secondary magnet to rotate as it passes up and down. The switch magnet is repelled by the secondary and snaps to the opposite side. This causes the cradle to pivot, moving the push rod which operates the switch contacts. The result is positive snap action interlock switching – no springs…no cams…no problems.
This simple reed switch device can be used to directly control low-amp equipment, or as an input to user supplied controllers or DCS systems. Available with either SPDT or DPDT action.
Approvals: USA FM MTII4200 and MTII4300
Brochures: MTII4300 Magnetostrictive Transmitter
Magnicator MTII 4200 Transmitter Installation, Operation, and Maintenance Instruction Manual
Drawings: Magnicator Switches, Transmitters & Accessories