RKI Instruments Beacon 800 - Manual (Page 18)

15 • Wiring the Beacon 800 Gas Monitor Beacon 800 Gas Monitor Operator’s Manual
distance guidelines. Shielded cable or wires in conduit are recommended for the 2-
wire and 3-wire 4 - 20 mA transmitter detector heads.
NOTE: If using shielded cable, do not connect the cable shield’s drain wire to earth
ground at the detector head. The drain wire is only connected to earth ground at
the Beacon 800.
6. Connect the wires from the detector head to the appropriate transmitter terminal strip.
See the detector head instruction manual for controller terminal connections.
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 signal
to the Beacon 800.
Connecting User-Supplied 4 - 20 mA Transmitters
The Beacon 800 may be used with a user supplied 2-wire or 3-wire 4 - 20 mA transmitter
which runs on 24 VDC nominal (the Beacon 800 supplies 28VDC). When this is done, the
Beacon 800 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 Beacon 800.
1. Turn off power to the Beacon 800 at the power source.
2. Open the Beacon 800 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 800 housing.
5. Route the wires from the transmitter through the selected conduit hub into the Beacon
800.
6. Connect the wires from the transmitter to the appropriate transmitter terminal strip.
See the transmitter instruction manual for controller terminal connections.
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 800.
Table 4: 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
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.