Marston MAS (Magnetic Alarm System)
The Marston ‘MAS’ eliminates the need to disconnect the electrical supply to the rupture disc assembly, reducing changeover time.
A ‘sensor’ is located in the vent side of the assembly, retained by a screwed compression fitting. The hole into which the sensor fits does not pass through to the holder bore, therefore the sensor does not come into contact with the product contained in the vent line. Attached to the vent side of the disc is a small but powerful magnet. The magnetic field that it generates is detected by the sensor. When the disc ruptures, the magnetic field moves away and activates the sensor. This simple switching effect can be used to initiate an alarm or a programmed shutdown procedure.
The Marston ‘MAS’ provides an integral, leak tight detector. The sensor, once fitted, does not need to be renewed when replacing the rupture disc. It can be unscrewed from the holder and replaced when the new disc is fitted. When the disc is replaced, the new disc includes a magnet already fitted which ensures that it will be installed in the correct position.