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Sensaphone
®
Model 1108 User’s Manual
12
Example with multiple
sensors connected to
Input 5. Alert condition
occurs when a normally
open switch closes.
23456781
GND GND GNDGND
Figure 2-9. Multiple Normally Open Sensors
2.12 Outdoor Wiring
When wiring sensors outdoors, DO NOT allow exposed wires
to run freely in open air; under such conditions, the Model
1108 is susceptible to serious damage during a lightning storm.
Depending upon the distance outdoor wiring must travel,
consideration should be given to use of shielded wire inside a
metal conduit. Both shield and conduit should be connected to
earth ground. This prevents stray voltage from entering the
unit.
sensor
Model 1108
Figure 2-10. Potential Sensor Damage from Stray Electrical Noise