Oxygen Equipment User Manual

6) Use the ↑ and ↓ arrow keys to adjust the displayed oxygen

concentration to the level of the known concentration. Pressing the

arrow keys changes the value in .1% increments. If the keys are held

down for more than 1 second the display will scroll at a rate of .4%

per second.

Note: If 10 seconds elapse between key actuations, the system will

store the latest calibration value and will revert to normal operation.

If this occurs inadvertently, simply repeat the calibration procedure.

7) 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 monitor 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 Monitor 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.

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