RKI Instruments Beacon 110 - Page 23

Beacon 110 Operator’s Manual 19
Connecting User-Supplied 4 to 20 mA Transmitters
The Beacon 110 may be used with a user supplied 2-wire or 3-wire source type 4 - 20 mA
transmitter which runs on 24 VDC. When this is done, the Beacon 110 is normally setup at
RKI Instruments with the following parameters: item name (example: Pressure), unit of
measure (example: PSI), and full scale (example: 100). For example, a Beacon 110 can
be setup for “Pressure” with units of “PSI” and a full scale of “100” PSI.
Perform the following procedure to connect a 4 to 20 mA transmitter that you supply to the
Beacon 110.
1. Turn off or unplug power to the Beacon 110.
2. Open the Beacon 110 door and turn off the power switch.
3. See the transmitter’s instruction manual for instructions on how to connect wires to the
transmitter.
4. Install an appropriately rated cable bushing or conduit in the right conduit hub on the
bottom of the Beacon 110 housing.
CAUTION: Only use the two factory installed conduit hubs on the bottom of the
housing for wire entry into the housing. Do not drill the housing for any
reason. See “Routing Wiring Into the Beacon 110 Housing” on page 13 for
more information.
5. Route the wires from the transmitter through the right conduit hub into the Beacon
110.
6. Connect the wires from the transmitter to the AMP terminal strip. Figure 11 below
illustrates typical transmitter wiring connections. See the transmitter instruction
manual for controller terminal connections. If shielded cable is used, connect the
cable shield’s drain wire at the Beacon 110 to the ground stud on the main PCB.
CAUTION: Do not route power and transmitter wiring through the same conduit hub.
The power wiring may disrupt the transmission of the transmitter’s signal to
the Beacon 110.
Figure 11: Generic 4 - 20 mA Transmitter Wiring
3-Wire Connection 2-Wire Connection
(DC Ground)
4 - 20 mA
+ 24 VDC
4 - 20 mA
+ 24 VDC
3-wire 4 - 20 mA
Transmitter
2-Wire 4 - 20 mA
Transmitter
BLK
GRN
WHT
RED
GRN
WHT
L
E
L
A
M
P
O
X
Y
S
BLK
GRN
WHT
RED
GRN
WHT
L
E
L
A
M
P
O
X
Y
S