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If the distance between the probe and DVR is too far, the probe requires a separate power supply:
Please connect 2 side to ground if conditional when use separate power, otherwise long distance transmission maybe make false alarm.
DVR
+12V
GND
Input1 Input2
DVR
+12V
GND
Input1 Input2
-
+
NO/NC
Sensor
12V power supply
-
+
NO/NC
Sensor
15
Net DVR
C
C
eLineTechnology.com
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