The 2315 series Sentrol garage door sensor is one of the best products ever made for protecting panel or sectional style overhead garage doors. It saves time and money during initial installation, and reduces the chance of future service calls to replace a damaged switch.
A garage door sensor is a magnetic contact used to connect a garage overhead door to a home alarm system. Note that this is an alarm device, and has nothing to do with the photocells used to stop a garage door when an object is in its path.
Not everyone wants or needs the garage roll-up door to be part of the main house alarm system, but those that do need a sensor that is dependable and trouble-free. The Sentrol 2315 garage door sensor is very reliable when properly installed for either professional or DIY security alarms.
Not sure if you want a garage security system? This page on connecting a garage door contact to a home alarm system can help you decide.
Sentrol designed the 2315 sensor to fit the track or rail of a standard
sectional garage door. It can be installed much faster than the older
floor-mounted garage door sensors, mainly by avoiding the need to drill
into the concrete garage floor.
Note that the 2315 Sentrol magnetic contacts will not
fit a one-piece garage door. If you have a single-panel, swing-up-type
garage door, use a standard garage door sensor and magnet like the
The Model 2315 Sentrol sensor is a 2-wire device designed for
standard N/C (normally closed) alarm panel zones. If you need N/O
(normally open) switches, use Sentrol 2317 rail contacts. These 3-wire devices provide both N/C and N/O connections.
Sentrol Garage Door Sensor Advantages
So, what makes 2315 Sentrol contacts so much better? Let’s take a look!
First, the 2315 Sentrol sensor mounts to the track or channel
of a sectional panel garage door, rather than on the floor like older
models. This automatically avoids some of the most common types of
garage door sensor damage. These include:
Crushing of the sensor and/or wiring cable by vehicles (car or otherwise)
Snagging of the cable on passing objects
Corrosion caused by standing water pooled around the floor-mounted sensor
Second, the Sentrol garage door sensor is specially shaped to
easily grab on to the roll-up door track. Simply fit the sensor and
L-bracket onto the track, and tighten the setscrew with a nut driver,
socket wrench, or even pliers. There’s no need to over tighten the
sensor set screw, it just needs to be tight enough to keep the switch
from sliding up or down.
And third, the Sentrol garage door sensor can be had with factory
installed rugged armored cable. Many other garage door sensors on the
market don’t come with armored cabling. This can allow the
wiring to be easily damaged, even by objects stacked against the garage
wall near the door opening.
Sentrol Garage Door Sensor Installation Tips
As with any magnetic contact, align the Sentrol garage door sensor
carefully with the magnet. Do this alignment after closing the door using the garage door opener, not by hand. This will be the most “natural” and repeatable closed position.
Check to see if the Sentrol door sensor can be positioned at one of
the track mounting brackets and still allow the magnet to line up. If
so, you can snap off the flange of the sensor, and clamp it between the
bracket and the track. This adds even more strength than using the
sensors set screw alone.
Always use cable clamps or clips to secure the armored cable of the
Sentrol sensor to the wall or other surface. Loops of cable are very
likely to get snagged on objects, and can easily be damaged. Place
clamps every 1-3 inches or as needed to keep the cabling against the
Connect the Sentrol garage door contact wiring to its own zone on the
alarm panel. I actually recommend doing this for any “one-of-a-kind”
device in a system, since you’ll very likely program the zone to behave
in a different manner than the other areas of the house.
To use the Sentrol garage door sensor as a perimeter burglary zone,
be sure to program extra long entry and exit delays. This will give you
enough time to disarm the system on arriving home, and time to close
the overhead garage door when leaving.
Some alarm panels have an “auto-bypass/auto-restore” feature. This allows you to arm the system with the overhead door open,
since the system automatically bypasses it. When the door closes after
you leave, the system automatically adds the door back into the system.
If your panel supports this feature, you won’t need a long exit delay.
To use the Sentrol garage door sensor as a “garage door open” sensor,
you’ll need to program the alarm panel zone accordingly. Most modern
panels have some way to display the status of a zone visually and/or
audibly without having it cause an actual alarm.
Security panel manufacturers use various terms for these “non-alarm”
zones, such as “environmental”, “day monitor”, or “supervisory”. After
programming the zone, be sure to test it to be sure it behaves the way
you want it to.
For more details on mounting Sentrol and other styles of switch, see this page on garage door alarm contact installation tips and techniques.
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