Envision ENV100, User Manual

Page: 45 / 182

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7) Once the sensors are initiated and warmed up the “Current Value” will fluctuate. When
the “Current Value” is between
0% and 20% (relative) of the calibration gas value the
Calibration status will display “ Press calibrate when measurement stabilizes ”. Tap the
“Calibrate” button once the current value has stabilized. If this button is pressed before
the measurement is fully stabilized, the calibration will be inaccurate. If the measurement
continues to change after the button is pressed, it is ok to press the calibrate button a
second (or third) time to get a better span.
a. If the “Current Value” is between 0 % and 20% (relative) of the calibration gas
value, then the handheld computer will adjust and store the calibration value once
the user taps the “calibrate” button.
b. If the “Current Value” is greater than 20% (relative) of the calibration gas value,
then the handheld computer will display the following message “Current
measurement is outside of expected range. Please verify calibration gas value
and/or restore factory calibration.” The technician may discard the field
calibration value and restore the factory calibration value by tapping the “Restore
Factory Calibration” button on the “Calibration … Span” screen. The technician
should then try to recalibrate. If the unit will not calibrate then the user should
contact technical support at Elkins Earthworks® at 330-725-7766.