CareFusion PrinterNOx Operating Manual page 20

With the water trap disconnected, press enter and the display will
change to:
The sampling pump will start and the PrinterNOx will monitor the
output of both sensors until a stable reading is obtained.
During this time, a line of asterisks appears on the screen to indicate
correct operation.
When zeroing is complete the readings for the NO and NO
are written into the battery backed memory and the display is
changed to:
Zeroing
*..............
Press CANCEL to abort
Calibration
-----------
1 Calibrate NO
2 Calibrate NO2
3 Exit
18
sensors
2