Wiring the Beacon 200 Gas Monitor • 25
CAUTION: Do not route power and detector head wiring through the same
conduit hub. The power wiring may disrupt the transmission of
the detector head’s to the Beacon 200.
Connecting User-Supplied 4 - 20 mA Transmitters
The Beacon 200 may be used with a user supplied 2-wire or 3-wire 4 - 20
mA transmitter which runs on 24 VDC. When this is done, the following
Beacon 200 parameters are normally setup at RKI Instruments: unit of
measure, item name, and full scale. For example, “PSI AIR” with a full
scale of 10 PSI.
The detector/transmitter terminals will accept 24 - 14 AWG wire. Select
wire that is rated to a minimum of 80°C, 0.75 A, and 150V.
Perform the following procedure to connect a 4 - 20 mA transmitter, which
you supply, to the Beacon 200.
1. Turn off or disconnect mains power to the Beacon 200.
2. Open the Beacon 200 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 an unused
conduit hub on the bottom of the Beacon 200 housing.
5. Route the wires from the transmitter through the selected conduit hub
into the Beacon 200.
6. Connect the wires from the transmitter to the appropriate detector/
transmitter terminals. The top detector terminal strip is for channel 1
Table 5: Wire Size Guidelines for RKI Detector Head Wiring
Detector Head Type
Number of
Wires to
Controller
Max Distance
to Controller
w/18 Gauge
Wire
Max Distance
to Controller
w/16 Gauge
Wire
Max Distance
to Controller
w/14 Gauge
Wire
Direct Connect LEL
4
500 ft.
1,000 ft.
2,000 ft.
Direct Connect Oxygen
2
500 ft.
1,000 ft.
2,000 ft.
Direct Connect H2S
2
500 ft.
1,000 ft.
2,000 ft.
Direct Connect CO
2
500 ft.
1,000 ft.
2,000 ft.
Direct Connect Cl2
2
500 ft.
1,000 ft.
2,000 ft.
Direct Connect SO2
2
500 ft.
1,000 ft.
2,000 ft.
2-Wire 4 - 20 mA Transmitter
2
2,500 ft.
5,000 ft.
8,000 ft.
3-Wire 4 - 20 mA Transmitter
3
2,500 ft.
5,000 ft.
8,000 ft.
