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

Model GX-2001 Operator’s Manual Operation • 17
4. To return to Measuring Mode, normal operation, press and release the
MODE/POWER button until the normal screen is displayed.
NOTE: While in Peak Reading Mode, if no control button has been
pushed for about 15 seconds, the Model GX-2001 returns to
Measuring Mode automatically.
Displaying STEL Readings
With the Model GX-2001, you can display STEL readings for H
2
S and CO.
STEL is an acronym for short-term exposure limit, and it shows the average
reading for H
2
S and CO during the last 15 minutes.
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. Using the DISP button, display either H
2
S or CO on the LCD.
3. With either H
2
S or CO displayed on the LCD, press the MODE/POWER
button twice to put the Model GX-2001 in STEL Reading Mode. “STEL”
displays next to the time reading on the LCD.
4. Press the DISP button to toggle between the STEL reading for H
2
S and
CO.
5. To return to Measuring Mode, normal operation, press the MODE/
POWER button.
NOTE: While in STEL Reading Mode, if no control button has been
pushed for about 15 seconds, the Model GX-2001 returns to
Measuring Mode automatically.
Combustible Gas Detection
There are two issues that must be considered when checking for
combustible gas.
• The combustible sensor will respond to any combustible gas. The
standard calibration for the GX-2001 combustible channel is to methane
(CH4). If the instrument is to be used to monitor for a different
combustible gas, such as hexane or propane, it should be calibrated to
that gas.
The table below lists the conversion factors for several hydrocarbon
gasses if the GX-2001 is calibrated to methane. To use this table,
multiply the display reading on the combustible gas channel by the
factor in the appropriate row to obtain the actual gas concentration. For
example, if you are detecting pentane and the display reads 10% LEL