The latch monitor provides an SPDT dry output which switches when a door is latched or unlatched. It can also monitor a deadbolt. The most common use for the latch monitor is to connect to an alarm system and report on
door status. When used in this way, the latch monitor provides higher security assurance than the more commonly employed magnetic contacts as they can report a door as “closed” when it is still unlatched or unbolted. A second use for the latch monitor is to initiate delayed exit when the latch is withdrawn from the inside on a door equipped with a Magnalock and logic timing equipment.

The latch monitor mounts behind the strike plate and is therefore concealed for optimum appearance. The three models differ as follows: The LMS-1 includes a single SPDT switch and is sized for a 2 3/4” ANSI cut-out. The LML-1 includes a single switch and is sized for a 4 7/8” ANSI cut-out. The LML-2 includes two separate switches and is sized for a 4 7/8” ANSI cut-out. The LML-2 is capable of separately monitoring a latch and deadbolt.