RKI Instruments Beacon 110 - Manual (Page 21)

Beacon 110 Operator’s Manual 17
Connecting RKI Detector Heads
Perform the following procedure to connect an RKI detector head to the Beacon 110.
1. Turn off or unplug power to the Beacon 110.
2. Open the Beacon 110 door and place the power switch in the off position.
3. See the detector head operator’s manual for instructions on how to connect the
detector head to a controller.
4. Install an appropriately rated cable bushing or conduit in the right conduit hub on the
bottom of the Beacon 110 housing.
5. Route the wires in conduit or shielded cable from the detector head through the right
conduit hub into the Beacon 110. See Table 5 below for wire size and distance
guidelines.
6. Unshielded twisted pair cable in conduit or shielded twisted pair cable is
recommended for all the direct connect detector heads. For the LEL detector, pair and
twist the R & B wires and the W & G wires. Shielded cable or wires in conduit are
recommended for the 2-wire and 3-wire 4 - 20 mA transmitters.
7. Connect the wires from the detector head to the appropriate detector/transmitter
terminals. See the detector head operator’s manual and the Beacon 110 Detector
Head Specifications sheet for detector head connections to the Beacon 110. 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 detector head wiring through the same conduit
hub. The power wiring may disrupt the transmission of the detector head’s
to the Beacon 110.
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
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 ESM-01 type 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.