A5/A3™ Service Manual 046-001141-00 4 - 5
Calibration System Calibration
4.3 System Calibration
NOTE: The anesthesia machine drive gas and calibration device drive gas type
setttings should be consistent with the actual drive gas type configured
for the anesthesia machine.
NOTE: Perform the corresponding calibration if any test item of the system
test about measurement accuracy is failed.
NOTE: Fluke VT Plus: The zero reading (offset) of the pressure measurements
may drift slightly with time and temperature. A zeroing function is
provided for the user to zero the offset drift. Typically, this is done
when a non-zero reading occurs when there is zero applied pressure.
However, it is good practice to zero the respective signal before any
measurement is taken.
NOTE: You can select VT Plus to perform automatic calibration of pressure
sensors or flow sensors, or any other calibration devices that fulfills the
accuracy requirements to perform manual calibration.
The anesthesia machine provides the function of monitoring volume, pressure, FiO2 and etc. When
these measured values have great deviations, it is very likely that measurement offset occurs to the
relevant measurement parts. In this case, you need to perform calibration again. After equipment
service, such as replacing the ventilator control board, expiratory valve assembly or solenoid valve
assembly, you need to calibrate the flow sensors or pressure sensors.
The following table lists the possible calibration items and calibration time.
SN Calibration item Functional description Calibration time
1
Flow calibration
(user)
Calibrate the flow sensors of
the breathing system.
1. The TV measurement deviation is greater
(more than 9% compared with the setting value)
after the flow sensors in the patient circuit have
been used for a long time.
2. The flow sensor in the patient circuit has been
replaced.
2
Flow calibration
(Service)
Calibrate the flow sensors
and inspiratory valve of the
anesthesia machine.
1. The expiratory valve assembly is replaced.
2. The ventilator control board is replaced.
3. The deviation between the measured value of
the ventilator flow sensor and that of the flow
measurement device exceeds more than 5% of
the reading or 1 L/min, whichever is greater.
3
Pressure
calibration
(Service)
Calibrate the pressure
sensors and PEEP valve of
the anesthesia machine.
1. The ventilator control board is replaced.
2. The expiratory valve assembly is replaced.
3. The deviation between the measured value of
the machine's pressure sensor and that of the
standard pressure gauge exceeds more than 5%
of the reading or 2 cmH2O, whichever is greater.
4
Pressure and flow
zeroing (Service)
Calibrate the deviation from
zero point of the ventilator
control board and auxiliary
ventilator control board.
Flow or Paw waveforms deviates from the
baseline.
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