Sensaphone® Model 1104 User’s Manual
GND
1
GND
2
GND
3
GND
4
~ ~
~ ~
Multiple
Alert condition occurs when a switch is opened
Figure 2-8. Multiple Normally Closed Sensors
To wire several normally open sensors to one alert input, connect them in parallel. To do this, take one lead from each sensor and attach it to the numbered terminal. Then, take the second lead from each sensor and attach each to the corresponding ground screw. Refer to Figure
GND
1
GND
2
GND
3
GND
4
Alert condition occurs when a normally open switch closes.
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.
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