Preventive Maintenance
84
5 Adjust minimum range calibration
a Apply ambient pressure to the system by removing the breathing circuit from the patient
module.
b Turn the P2 OFFS potentiometer (P8, AVM 3-2) until the screen bar graph shows 20.
c Select MIN on the touch screen.
6 Adjust maximum range calibration
a Attach a Calibration pump (900-4726) to the Pressure sensor P2 on the Module 2, AVM 3-2
board.
b Apply a pressure of 80 cmH
2
O to the Pressure sensor P2.
c Turn the P2 GAIN potentiometer (P7, AVM 3-2) until the screen bar shows 80.
d Select MAX on the touch screen.
e Remove the calibration pump and reconnect the original tube to the pressure sensor P2
f Check both valves alternately for correctness and readjust, if necessary.
7 Select SAVE twice on the touch screen to store minimum and maximum values in memory.
8 Select QUIT to return to the main menu
Caution: Pressing QUIT at any time during the procedure will cancel the session’s
settings and reload the previously stored calibration coefficients.
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