RKI Instruments GX-2001 Manual - Manual (Page 32)

27 • Calibration Model GX-2001 Operator’s Manual
Setting the Span Readings for All Target Gasses
When setting the span readings manually for one gas sensor at time, you
will calibrate each gas sensor individually.
1. Make sure you have set the zero readings for all the target gasses and
have set up the calibration kit as described in the procedure above. If
you are going to calibrate all the target gasses, start with O
2
followed by
H
2
S, CO, and HC.
2. Make sure the Model GX-2001 is off.
3. Press and hold the AIR button, then press and hold the MODE/POWER
button. Release both buttons when you hear a “beep.” The LCD
displays “CAL,” the battery level, and the time.
4. Pressing the MODE/POWER button allows you to toggle through each
target gas once so you can calibrate that gas. In the upper left corner of
the LCD, “CAL” and the name of the target gas being calibrated, such
as “O
2
,” are displayed alternately in rapid succession.
5. Attach the regulator to the gas cylinder. The fixed-flow regulator
automatically begins introducing the calibration sample to the sensors.
6. Let the gas flow for two minutes before adjusting the span.
7. Use the AIR button to in increase the reading and the DISP button to
decrease the reading until you have matched the concentration of the
calibration sample.
NOTE: If you cannot adjust the display reading to match the calibration
sample, you may need to replace the sensor you are calibrating,
as described in “Replacing a Sensor.”
8. After you have set the span for the sensor, press the MODE/POWER
button to display the next sensor. In the upper left corner of the LCD,
“CAL” and the name of the target gas being calibrated, such as “H
2
S”
are displayed alternately in rapid succession.
9. Repeat steps 7 and 8 above to set the span for the remaining target
gasses.
10. When you are finished setting the span for the target gasses, remove
the regulator from the cylinder, remove the adapter plate from the unit,
then store the contents of the calibration kit in a safe place for future
use. The tubing may be left on the adapter plate for convenience.
11. Use the MODE/POWER button to place the Model GX-2001 in
Measuring Mode or to turn the unit off.