RKI Instruments GX-82 - Manual (Page 8)

4 • Components and Controls Model GX-82 Instruction Manual
Buzzers and Earphone
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.
A 2.5 mm phone jack is located near the bottom left rear corner of the case. You can use
this jack to connect an extension buzzer or earphone.
Battery Compartment
The battery compartment is located on the front of the GX-82. The battery compartment
has a sliding access panel so you can easily replace the batteries. A plastic strap with a
snap fastener is included to secure the cover in place for everyday use.
The GX-82 uses two “C” size cells. Standard alkaline batteries will run the GX-82 for
approximately 10 hours; rechargeable nickel-cadmium (Ni-Cd) batteries will run the
GX-82 for approximately 9 hours.
NOTE: You must remove rechargeable batteries from the GX-82 and charge them
separately.
Circuit Boards
The GX-82 has three circuit boards: the main analyzer board, the power supply 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.