Cable Selection - AMC SIR Series Instruction Manual

AMC-SIR Refrigerant Gas Sensor/Transmitter

4.3 CABLE SELECTION

The following section details the cable selection needed to ensure proper operation of the AMC-
SIR Refrigerant Gas sensor/transmitter.
The figure below is an aid for cable selection. A 3-conductor shielded cable is employed for
interconnection. All AMC Monitors typically output 24VDC with the exception of the 1A Monitor
which will vary from 19-24VDC depending on the load, so choose cable accordingly. When
using just AMC-SIR transmitters with a 1A Monitor the voltage will be over 20VDC.
There are three variables that determine the maximum cable length; wire gauge, power supply
voltage, and load resistance. A minimum operating voltage of 14VDC is required at the
sensor/transmitter. Wire gauge can range from 20 to 16 AWG.
Figure 4-7 Wire Cable Selection Graph
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