RKI Instruments GX-2009 Manual - Manual (Page 14)

9 • Description GX-2009 Operator’s Manual
Printed Circuit Boards
The primary function of the GX-2009’s printed circuit boards is to amplify
the signal sent to them from the four gas sensors, convert the signal to a
measurement of gas concentration, display the gas concentration on the
LCD, store peak, STEL, and TWA readings, and activate the alarm circuit if
an alarm point has been reached. They monitor battery level, battery
failure, and sensor failure. They also control the GX-2009’s time function
and various operating modes.
NOTE: The printed circuit boards contain no user serviceable parts.
Alarm LED Arrays
Three red alarm LED (light emitting diode) arrays are visible through
frosted plastic lenses in the case. One is on the top, one on the left side,
one on the right side of the case. The alarm LED arrays alert you to gas,
low battery, and failure alarms.
Buzzer & Vibrator
A solid-state electronic buzzer is mounted inside the GX-2009’s case. The
buzzer sounds for gas alarms, failure alarms, and as an indicator during
normal use of the GX-2009’s various operating modes.
A vibrating motor inside the GX-2009 case vibrates for gas alarms and as
an indicator during normal use of the GX-2009’s various operating modes.
NiMH Batteries
Two NiMH (nickel metal hydride) batteries, each with an integral holder,
supply 2.4 volts to power the GX-2009. The batteries will run the unit for up
to 20 hours when no alarms have been activated during that time period.
The batteries are designed to be charged while in the GX-2009 with the
GX-2009 Charging Station. The batteries should not be removed from the
GX-2009 unless they need to be replaced because they will no longer hold
a charge. The battery icon in the lower left corner of the LCD shows the
AIR
• Turns the LCD back light on.
• Performs a fresh air adjustment
• Enters Calibration Mode with the MODE POWER
button.
• Enters User Setup Mode with the MODE POWER
button.
• Adjusts or changes displayed parameters
Table 2: GX-2009 Control Buttons
Button Function