REV 0.0 April 18, 2023
Page 4
D - Installation Examples
1.
Single AC Powered Sensor
The following example shows an AC powered sensor (ABM400 or ABM430 series), without a current output
connection, connected to a Gateway.
As the current loop output of the sensor is unused, the Gateway, located within 6ft (2m), is shown directly wired to the
sensor through one cable gland, while the AC supply requires a second separate cable gland.
As the Gateway is not supplying sensor power, the red wire is either cut off or insulated with tape inside the sensor.
The black wire from the red/black pair is still connected to provide a signal common for the RS485 link, so it is
connected to Common at Terminal #4 (mA Output “-“).
The shield is shown grounded at the power supply and not connected in the sensor. As AC powered sensors have both
Terminals 3 and 6 earth-grounded for electrical safety, the shield could instead have been left unconnected at the
power supply and connected to Terminal 3 in the sensor.
Figure 1 – AC Supply Sensor Connections (No Current Output) Using Gateway Pigtail
