Paintings and other hanging works of art can be protected with surface or recessed-mount wide gap switches.
This information describes how to achieve dual switching with one magnetic contact and one magnet. DPDT magnetic contacts such as the Sentrol 1087D, 1084D, 2507AD, or 2707AD (see catalog) may be used in place of two contacts or one contact and a floor mat for an annunciator panel.
You can increase the gap distance of a recessed switch in a door about 40% by placing two magnets side-by-side. This is helpful if you need to increase the gap distance but do not have a wide gap switch.
Each sample was selected at random from finished goods inventory. Tests on each contact were run to measure pull in (make), and drop out (break) distances prior to mounting on the 6" wide, 16" long, and 1/2" thick steel plate.
Sentrol recessed contacts can be installed in a variety of positions to accommodate any application. As shown in Figure 1, the switch and magnet can be mounted end-to-end within an imaginary arc around the switch, or parallel to the switch.
Securing a freezer door against unauthorized entry. The Sentrol normally closed 2505A-L5 industrial magnetic contact can withstand condensation or temperatures in freezers down to -40˚F.
Art objects such as statuary, vases, chests, or other works of art not in cabinets or other coverings, can be protected with the Sentrol roller magnetic switch.
Use a Sentrol 2105A standard-type Magnapull to extend coverage of a normal marine alarm to the dock or moorage where the boat is secured.
The interior of a boat can be protected with a magnetic contact in a simple alarm system. Protecting the hatches and companionway can be easily accomplished using recessed or small surface mount switches.
Using surface mount contacts, the switch and magnet are both concealed when the window is closed. Use off-white, white or mahogany brown units to match plastic cover on the window.
For most chain-link rolling gates, there is considerable tolerance and leeway in the "closed" position. This makes it difficult to assure proper alignment of the gate switch for alarm protection.
Five methods are presented here for protecting deeply recessed doors with surface mount contacts. Note that when mounting on steel, a spacer should be used behind the switch, and/or a wide gap switch should be used.
It may happen, during installation, that holes are over-drilled, under-drilled, or have an uneven diameter. Oversized holes can occur due to difficulties in drilling, especially in tight quarters or enclosed spaces.
Protecting double hung windows with recessed or surface-mounted magnetic contacts with regular or wide gap switches.
Gun cabinets can be protected like china cabinets on the previous two pages. However, since the glass front to a gun cabinet could be broken, and guns stolen without sounding the alarm, two other methods for protecting guns are provided here.
Valuable china and other collectibles can be protected by arming a china cabinet with either recessed or surface mount magnetic contacts.
