Sensaphone 400 - Manual (Page 29)

Chapter 2: Installation
27
Sensor wired to
Alert Input 2
Sensor wired to
Alert Input 3
1 C
ZONES
2 C 3 C 4 C
Figure 2-7 Two Sensors Wired to Adjacent Zones
NOTE: Do not use sensors, switches, or relays that supply any voltage
or current to the Model 400. Be aware of proximity to other electrical
wires or components when placing wires that lead from the sensors to
the unit. Avoid running the wires near electrical devices that use high
voltage or current, such as motors, heavy machinery, etc. This voltage
may be inductively coupled into the sensor wiring and could result in
damage to the the Model 400’s circuitry. Try to place wires at least 6
inches from other electrical wiring or devices.
2 .11 multIple SenSorS
The Model 400 may have more than one sensor connected to the same alert
zone, as long as the normal condition for each sensor on the same alert
zone is identical (either all N.O. or all N.C.). However, only one remote
temperature sensor can be used on each zone.
When wiring several normally closed sensors on one zone, they must be
connected in series. Connect one lead from the first sensor to the num-
bered screw of the alert zone. Next, take the other lead from the first sen-
sor and connect it to one lead from the next sensor. Continue connecting
sensors end-to-end until you have connected all of your sensors. Take the
second lead from the last sensor and connect it to the common screw on
the Model 400. See Figure 2-8. Multiple N.C. sensors are typically magnetic
reed switches to monitor the security of windows and doors.