866.4.Maxtec www.maxtec.com 9
9.0 Frequently Asked Questions
After I calibrate to 20.9%, the display changes as much as ± 1%.
» This is within the normal Handi+ operating tolerance of ± 1% when temperature and
pressure are constant.
I have calibrated to 99.9% but when I check my oxygen delivery equipment,
the Handi+ reads ".0.4" or greater (Over Range Indicator).
» It is recommended that you conduct the calibration procedure again to get another
reading. The most likely cause is that the Handi+ has received a "false" calibration value.
» Make sure that the calibration gas is connected to the Handi+ at 2 liters per minute
for a minimum of 2 minutes prior to proceeding with calibration.
» This 2-minute equilibration time is necessary to insure that the sensor is completely
saturated with the calibration gas.
I have found the reading to drift greater than ± 3% from a know source
value. What is the possible cause?
» The sensor may be at or near its useful life.
» Replace your Handi+.
» Sensor life is dependent on the oxygen concentration exposure.
For example, a sensor which is used to check flow meters once a week for 8
hours will outlast one which is used to analyze oxygen blender performance
24 hours per day, 5 days a week.
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