Phonetics 1104 - Manual (Page 24)

Sensaphone ® Model 1104 User’s Manual
12
Alert condition occurs
when a normally open
switch closes.
2 3 4 1 GND GND GND GND
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
1104 is susceptible to serious damage during a lightning storm.
Depending upon the distance outdoor wiring must travel,
consideration should be given to the use of shielded wire inside
a metal conduit. Both shield and conduit should be connected
to an earth ground. This prevents stray voltage from entering
the unit.
sensor
Model 1104
Figure 2-10. Potential Sensor Damage from Stray Electrical Noise