Digital Monitoring Products Inc 1128 User Manual

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1128 INSTALLATION GUIDE     |     DIGITAL MONITORING PRODUCTS

The 1128's 360° detection coverage is measured from the 1128 to the point on the glass farthest from 
the 1128. Refer to the table below to determine the best location to place the 1128 based on window 
type, glass thickness, window to wall range, and wall type.

Note: The sensor can be mounted as close as 3.3' (1 m) from the glass and the minimum glass 

size is 1' x 2' (0.3 m x 0.6 m). 

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Plate

3/32" - 1/4" (2.4mm - 6.4mm)

20' (6m)

Opposite, adjoining, ceiling

Tempered

1/8" - 1/4" (3.2mm - 6.4mm)

20' (6m)

Opposite, adjoining, ceiling

Laminated

1/8" - 1/4" (3.2mm - 6.4mm)

20' (6m)

Opposite, adjoining, ceiling

Wired

1/4" (6.4mm) 

20' (6m)

Opposite, adjoining, ceiling

Armor-coated

N/A

12' (3.65m)

Opposite, adjoining, ceiling

To optimize detection, install the 1128 in the following areas:

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Large rooms with moderate noise

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In the direct line of site of all windows that are to be protected

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On the opposite wall of the window that it's protecting. See Figure 4 for detection range.

20 ft (6m) 20 ft (6m)

To avoid false alarms, do not install the 1128 in the following areas:

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Rooms with lined, insulated, or dampening drapes

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Rooms with closed, wooden shutters on the inside

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Room corners

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Where white noise (air compressor) is present

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Rooms smaller than 10'x10' 

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Rooms with multiple noise sources like televisions, sinks, speakers, etc.

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Excessively humid rooms

Note: Avoid programming the 1128 as a day or supervisory zone to help avoid false alarms.