SENTROL Application notes - Alarms BC
SENTROL Application notes - Alarms BC
SENTROL Application notes - Alarms BC
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......................................................................................................................................................................... Introduction<br />
Magnets<br />
Recessed<br />
Switch<br />
MOUNTING<br />
Mounting Positions for Recessed Switches<br />
<strong>Application</strong>:<br />
Sentrol recessed contacts can be installed in a variety of positions to accommodate<br />
any application. As shown in Figure 1, the switch and magnet can be mounted<br />
end-to-end within an imaginary arc around the switch, or parallel to the switch. If<br />
using a wide gap switch with a bare magnet, the red end must be mounted away<br />
from the switch (wide gap switches are sensitive to the polarity of the magnet).<br />
Gap distance will vary approximately 20% from the rated gap distance of the<br />
switch, depending on the type of switch and the mounting position. It will be<br />
necessary for the installer to experiment to determine if a given switch will work in<br />
a given position.<br />
Note: Switch and magnet must not be mounted in a “T” configuration as shown<br />
in Figure 2. In cases where a surface magnet must be used with a recessed switch,<br />
use a surface mount switch from the 1082 switch series. Mount the magnet as<br />
shown in Figure 3.<br />
Figure 1. Acceptable Magnet<br />
Mounting Positions<br />
Switch<br />
Red End<br />
(if Wide Gap)<br />
Approximate arc through<br />
Which magnets may be<br />
rotated<br />
Pro-Tips For Reliable Installation of Magnetic Contacts<br />
1. When installing concealed switches in green lumber...<br />
to prevent switch damage as the lumber dries, twists,<br />
and contracts.<br />
a. Over-drill (loose fit) the mounting hole. Use RTV<br />
(Sentrol 1905) to hold the unit in place.<br />
b. As alternate, use adapter such as Sentrol 1908 model.<br />
c. Use Sentrol model 1275 or 1275W Wing Fit model.<br />
2. To protect loose-fitting doors from false alarms...<br />
a. Mount the switch and magnet near the hinge side<br />
of the door.<br />
b. Use a Sentrol wide gap unit to assure<br />
trouble-free performance.<br />
3. To protect steel doors...<br />
a. Use wide gap switches for maximum tolerance.<br />
b. Use recessed switches that provide adequate insulation<br />
from steel (such) as Sentrol 1078 or 1078C).<br />
MAGNETIC CONTACTS<br />
Magnet<br />
Recessed<br />
Switch<br />
Magnet<br />
Figure 2.<br />
Incorrect Mounting Positions<br />
Magnet<br />
Figure 3. Recessed Switch with<br />
Surface Mount Magnet<br />
3.7
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