O2 Sensor Calibration - Mindray A5 Service Manual

2.3.2.3 Troubleshooting: Leak Test
The following table lists the commonly-encountered problems and recommends actions for
2.3.2.2Breathing System Leak Test in Mechanical Ventilation Mode.
Failure description
Leak test failure is
prompted immediately
after [Start] is selected
(typically, the leak test
requires at least 3
minutes).
During leak test, the
pressure indicated by the
airway pressure gauge
fails to reach 30 cmH2O.

2.3.3 O2 Sensor Calibration

NOTE: Both a 21% and 100% O2 calibration MUST BE performed before first use of the
A5/A3. The O2 sensor is not calibrated with the machine at the factory.
NOTE: Calibrate the O2 sensor when a great deviation of O2 concentration monitored value
occurs or when the O2 sensor or ventilator control board is replaced or when prompted by
the anesthesia system.
NOTE: Before calibration, observe if the O2 sensor displays numerics on the measure screen.
If not, check the O2 sensor connection line, or replace the O2 sensor until measure
numerics are displayed.
Possible cause
The Auto/Manual ventilation
switch is set to the bag position
and the message [Manual Vent.]
is prompted.
The reading on the drive gas
(O2) pressure gauge indicates
drive gas pressure low (lower
than 200 kPa) and the alarm of
[Drive Gas Pressure Low] is
produced.
1. Before the leak test, the
bellows is not fully inflated.
2. The Y piece on the breathing
tube is not connected to the test
plug.
3. The bellows housing is not
properly installed.
2-23
Recommended action
Set the Auto/Manual
ventilation switch to the
mechanical ventilation position.
Replace or connect gas
supplies and make sure that the
drive gas pressure is at 350 to
450 kPa.
Check the connections of
the pneumatic circuit and re-
install the pneumatic circuit.