RKI Instruments Beacon 100 - Manual (Page 9)

Beacon 100 Gas Monitor Operator’s Manual Internal Description • 9
NOTE: See the detector head operator’s manual and the Beacon 100 Detector Head
Specification Sheet for the installed detector head to wire the detector head to the
appropriate detector terminal strip connections.
Analog Output terminal strip
The 2-point analog output terminal strip (labeled 4-20 mA out) is directly to the right of
the detector terminal connections. You connect wiring from a recording device (if
applicable) to the analog output terminal strip.
The output at the analog output terminal strip is 4 - 20 mA.
Right Hand terminal strip
The right hand terminal strip located about in the right middle of the board is used for
internal connection of the instrument buzzer and reset switch. This right hand strip also
has terminals marked “24 VDC OUT”, which can be used for powering an external pump
for certain gas detection heads.
Relays
Four relays are located just above the external wiring terminal strips. The relays are
single-pole, double-throw (SPDT) and are rated for 12 amps at 120 VAC (resistive), or 6
amps at 220 VAC. The relays are from left to right Fail, Alarm 1, Alarm 2, and Alarm 3.
NOTE: You can select normally energized or normally de-energized relays in the
Instrument Setup program. This section describes the default setting: normally
de-energized. The fail relay is factory-set as normally energized and is not
user-selectable.
Display Screen
NOTE: The display screen, status lights, and program buttons are mounted to a small
circuit board. The circuit board is mounted to the main circuit board by standoffs.
The display screen is mounted to a circuit board that is installed in front of the main
circuit board. The display screen simultaneously displays the target gas, measuring unit,
and current gas reading.
The display screen also displays messages, settings, and other data when you are
operating the instrument programs (see Chapter 4, Operation).
Status Lights
The Beacon 100 includes five status lights that indicate the current status of the monitor.
PILOT light
The PILOT light is above the display screen and to the left of the FAIL light. The green
PILOT light is on when the monitor is receiving incoming power.
FAIL light
The FAIL light is above the display screen and to the right of the PILOT light. The FAIL
light turns on when the Beacon 100 is experiencing a fail condition. A fail condition can be
caused by a failure within the monitor or detector head wired to the monitor. See Chapter
5, Maintenance, or the troubleshooting section in the detector head’s operator’s manual to