The MS422 is an optional selector unit for the MS421B bridge watch alarm system, allowing the selection of up to six backup officers to be alerted during emergency situations via a rotary switch and corresponding LED indicators.
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The MS422 is an optional selector device for the Marble MS421B bridge watch alarm system. This device is used to select which backup officer is to be alarmed in case of emergency situations when the watch alarm enters the “call officer” stage. This situation occurs when the officer on the bridge does not respond to the signalling watch alarm. The six yellow LEDs indicate which backup officer is to be ordered on the bridge during emergency situations. Use the rotary switch on the panel to change the backup officer. A maximum of six officers can be selected.
