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http://www.automation.siemens.com/w1/index.aspx?nr=5877
Motion Sensors - Process Instrumentation - Siemens | Printed: 11/08/2009


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Motion Sensors

Motion sensors can warn in case of equipment malfunction and shut down machinery in case of a slowdown or failure. They are rugged and perform even in harsh industrial conditions. All of the MFA 4p motion sensing probes as well as the Millpulse 600 can be mounted up to 100 mm (4”) from the ferrous target, reducing the chance of damage to the probe and the equipment. The probes are not affected by moisture or dust build-up.

Milltronics MFA 4p
controller is a highly sensitive single setpoint motion sensor system, used with MSP and XPP probes

Milltronics Millpulse 600
Heavy-duty 2-wire motion sensor providing solid state switch output to PLCs between 18 to 135 V AC or DC.

Milltronics ZSS
Heavy-duty zero speed alarm switch

Principle of Operation

Siemens Milltronics probes work on the principle of Faraday’s Laws of Electromagnetic Induction. When a ferromagnetic object enters the probe’s permanent magnetic field, it distorts the flux, causing its coil windings to generate a voltage. This voltage is proportional to the strength of the magnet and the number of wire turns in the coil (constant in the probes) and the speed at which the ferrous target passes through the flux. The generated voltage is also inversely proportional to the square of the distance between the target and the probe.

The robust motion sensors provide the contacts to shut down machinery whenever under-speed, over-speed or plant equipment failure occurs. On belt, drag and screw conveyors, or on bucket elevators, fans and pumps, the speed alarm option can warn instantly of equipment malfunction. Some probes may be linked to a programmable logic controller to monitor equipment.

 
 

© Siemens AG 2009


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Series
Milltronics MFA 4p
Milltronics MillPulse 600
Milltronics ZSS

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