User Manual

ImpactXtreme Operator’s Manual 8 March 2013
Zero Calibration
Zero calibration, or ‘auto zero, establishes stable baseline readings for all sensors by adjusting
the detector’s baseline concentration reading to match the concentration of gas found in a clean,
uncontaminated environment. The baseline reading becomes the ‘zero’ on the measurement
scale that the detector uses to display changes in gas concentrations.
Related Topics
1) Connect/Disconnect Gas Cylinder
2) Calibration
3) Troubleshooting
Calibrate only in a normal atmosphere (20.9% O
2
) that is free of hazardous gas. Do not
calibrate in a hazardous area.
Zero Calibration
1) Move to a normal atmosphere (20.9% O
2
) that is free of hazardous gas.
2) Activate the detector, if necessary.
3) Begin the zero calibration.
4) With the detector in normal operating mode, press to open the main menu.
5) Press to scroll to Calibration, and press to open the Calibration menu.
6) Select Zero calibration and press to begin the Zero calibration.
7) When auto-zero on start-up is enabled, then the instrument will start zero calibration after
start-up sequence is complete automatically. For more information, see User Options and
Settings, or consult the ImpactXtreme Technical Reference Guide.
8) When prompted, press to confirm that you are in a normal atmosphere (20.9% O
2
) that
is free of hazardous gas.
9)
10) If you are not in a normal atmosphere (20.9% O
2
) that is free of hazardous gas, press to
cancel the Zero Calibration.