Sensaphone Express II - Manual (Page 21)

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Chapter 3: Inputs
Figure 4: shunt configurations
WIRING THE INPUTS
To use a dry contact or temperature sensor on an input, wire one lead to the numbered screw of
input terminal and the other lead to the corresponding common screw. See Figure 5:
Figure 5: Dry contact sensor
To use a 4–20mA sensor on an input, you must supply power to it. You may power a 4–20mA
sensor using the Express II internal power supply, or you may wire the sensor to an external
power supply.
To use the internal power supply, wire the positive lead from the sensor to the unit 24V power
supply. Wire the negative lead to a numbered input terminal screw. See Figure 6.
NOTE: The number of internally powered sensors will affect battery backup time during a power
failure.