Figure 2-1A. Recommended actuation of the BMS.

TM 5-6350-262-14/8

NAVELEX 0967-LP-466-9081

TO 31S9-4-31-1 Chg 1

(2) Install units as shown in figure 2-1 using

should be offset 1 1/2" as shown in the figure. This

appropriate mounting hardware. The units should be

relative motion is not recommended since, to produce

positioned such that they will be in the same plane and

this motion, the Balanced Magnetic Switch is mounted

separated by a distance greater than 1/4 inch and less

outside the secure area or on a door the hinges of which

than 1 inch when the door or window is closed. The

are accessible from outside the secure area.

separation would be as narrow as possible within these

limits. Note that the index marks on the magnet

installed on a door that is not constructed of steel and is

assembly and the switch assembly must be oriented as

not covered on the outside with steel plates, the door

shall be covered with steel (minimum 16 gage) as

(a) Movement of the door or window

shown in figure 2-1D. The steel plating shall extend

should produce the relative motion depicted in figure 2-

from the jamb to at least one foot below the top of the

1A. The relative motions shown in figure 2-1B are not

door and across the door from jamb to jamb. If the door

recommended since the switch was not designed to

frame is not constructed of steel it shall be covered with

operate in this manner.

steel as shown in figure 2-1D. The plate shall extend

across the top of the frame from jamb to jamb. The top

(b) If the switch is mounted such that

of the actuating magnet should be flush with the top

movement of the door or window produces the relative

edge of the door as shown in figure 2-1D.

motion shown in figure 2-1C, the switch assembly

Figure 2-1A. Recommended actuation of the BMS.

Change 1

2-2.1