RKI Instruments GX-86 - Manual (Page 8)

4 • Components and Controls Model GX-86 Instruction Manual
Control Panel
The control panel is at the top of the GX-86 for easy access when you carry the GX-86. The
control panel contains the display, alarm lights, and buttons that control the many
functions of the GX-86. The buttons are touch-pads to reduce the possibility of accidental
activation or damage.
Buzzer
A solid-state electronic buzzer is mounted at the front of the case, behind a perforated
grill. The buzzer sounds distinct signals for gas, malfunction, and low battery alarms.
Battery Compartment
The battery compartment is located on the front of the GX-86. The battery compartment
has a sliding access panel so you easily replace the batteries. A plastic strap with a snap
fastener is included to secure the cover in place for everyday use.
The GX-86 uses two “C” size cells. Standard alkaline batteries will run the GX-86 for
approximately 8 hours; rechargeable nickel-cadmium (Ni-Cd) batteries will run the GX-86
for approximately 7 hours.
NOTE: You must remove Ni-Cd batteries from the GX-86 and recharge them separately.
Circuit Boards
The GX-86 has two circuit boards: the main analyzer board and the display board. The
main analyzer board contains the connectors for the diffusion head, control circuits, and
adjustment potentiometers. The display board contains the light sensor, display, buttons,
and alarm lights. The circuit boards are linked by plug-in connectors.
Table 2: GX-86 Button Functions
Button Function
PEAK/AIR The PEAK/AIR button displays the highest reading for
exposure to LEL, H
2
S, and CO, and the lowest reading for
O
2
exposure. It is also used (with the BATT/AIR button) to
activate the GX-86’s Auto Zero function.
(Both measurements are tracked since the last time the
GX-86 was turned on).
DOSE The DOSE button displays the average level of H
2
S and CO
exposure and the duration of the measurement.
BATT/AIR The BATT/AIR button displays the battery voltage. It is also
used (with the PEAK/AIR button) to activate the GX-86’s
Auto Zero function.
ON The ON button turns on the GX-86.
OFF The OFF button turns off the GX-86.
(The electrochemical sensors continue to receive bias power
when the GX-86 is turned off.)
Alarm Lights Red light-emitting diodes (LEDs) labeled COMB, OXY, H
2
S,
and CO flash when the alarm for that gas is activated. The
alarm light automatically resets when the conditions fall
below (or rise above for O
2
) the alarm levels.