RKI Instruments GX-2001 Manual - Manual (Page 17)

Model GX-2001 Operator’s Manual Operation • 12
Operation
This section describes the normal operation of the Model GX-2001. It
explains how the unit can be used to display peak gas readings of the four
target gasses and to display STEL and TWA readings for H
2
S and CO. It
covers important issues regarding combustible gas detection. It also
covers alarm indications and use of the aspirator adapter accessory.
Normal Operation
After you have powered up the Model GX-2001 and performed a demand
zero for the four target gasses following the instructions of the previous
section, “Start Up,” the Model GX-2001 is in Measuring Mode.
In Measuring Mode, the battery level, time, and gas concentrations are
displayed on the LCD. The Model GX-2001 cycles through the four target
gases, starting with O
2
, then H
2
S, CO, and HC. Oxygen is displayed as a
percentage (%), H
2
S and CO as parts per million (ppm), and HC
(combustible gases) as a percentage of the lower explosive limit (% LEL).
Displaying Peak Readings
You can display peak readings of the four target gasses when the Model
GX-2001 is in Measuring Mode using the MODE/POWER and DISP
buttons. With oxygen, you can display both peak and minimum readings.
1. Make sure the Model GX-2001 is in Measuring Mode. The four target
gasses should be displaying in sequential order on the LCD.
2. Press the MODE/POWER button once to put the Model GX-2001 in
Peak Reading Mode. A small peak (minimum for O
2
) symbol is
displayed in the lower left corner of the LCD.
3. Press the DISP button to cycle through the four target gases. The peak
readings of these gasses are displayed on the LCD.
NOTE: Oxygen has both a peak and minimum reading.
O2
2 0 . 9
2 1 : 1 9
%
Target gas Battery
charge
Gas concentration
Time
Figure 2: LCD in Measuring Mode