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after the button is pressed, it is ok to press the calibrate button a second (or third) time to
get a better zero.
a. If the “Current Value” is between 0% and 1% then the handheld computer will adjust
and store your calibration once the user taps the “calibrate” button.
b. If the “Current Value” is greater than 1% 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 … Zero” 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.
7) The pump will continue to run and the sensors will continue to monitor until the user
returns to the “Calibration” menu by tapping the “Calibration” button in the lower right
hand corner of the touch screen.
8) Now that the Trimble handheld computer has returned to the “Calibration Menu” the
user will notice that the parameter that has been calibrated is now highlighted in green.
The user may now select the next gas to calibrate.
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