RKI Instruments 12 VDC Beacon 200 - Manual (Page 22)

18 • 12 VDC Beacon 200 Operator’s Manual
Connecting User-Supplied 4 - 20 mA Transmitters
The 12 VDC 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 12
VDC Beacon 200 is normally setup at RKI Instruments with the following
channel parameters: unit of measure, item name, and full scale. For
example, “PSI AIR” with a full scale of 10 PSI.
Perform the following procedure to connect a 4 - 20 mA transmitter, which
you supply, to the 12 VDC Beacon 200.
1. Turn off power to the 12 VDC Beacon 200 at the power source.
2. Open the 12 VDC 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 12 VDC Beacon 200 housing.
5. Route the wires from the transmitter through the selected conduit hub
into the 12 VDC Beacon 200.
6. Connect the wires from the transmitter to the appropriate detector/
transmitter terminals. The top detector terminal strip is for channel 1
and the bottom one is for channel 2. See the transmitter instruction
manual for controller terminal connections. Figure 10 below illustrates
typical transmitter wiring connections.
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.