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8) When the calibration value is set, press the CALIBRATE or
LOCK/UNLOCK key again to accept the calibration setting and
return to normal operation.
Note: If the message "CAL", followed by the message "Er" flashes
on the display after entering the desired calibration value, the
system has determined that the entered value will not allow
operation within the specified output range of the sensor. This
situation may occur if:
a) the operator has inadvertently entered the wrong concentration
for the calibration gas.
b) the concentration of the calibration gas is not correct.
c) the sensor is in need of replacement.
d) the operator attempted to adjust the analyzer before allowing
sufficient time for the calibration gas to purge out the previous
sample.
e) the flow and pressure of the calibration gas was not properly
regulated.
Check these items and repeat calibration. If calibration error
continues to occur, contact the service department of the distributor
from which the unit was purchased, or you may call Maxtec's
Customer Service Department directly.
2.2.3 Automatic Calibration to Room Air
The MAXO2 analyzer can quickly be calibrated to room air (20.9%) using
a quick-key shortcut command. This function saves time by setting the
calibration value to 20.9% without scrolling the display. To use this
function:
1) Introduce room air to the sensor at a rate of 1-5 liters per minute
(2 liters per minute is recommended) and allow the reading to
stabilize.
2) Press the LOCK/UNLOCK key to unlock the keypad.
3) Press and hold down the CALIBRATE key. When the "%" sign
starts to flash, press the ↓ arrow key to set the calibration value to
20.9%.
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