4-18
4.3 System Calibration
NOTE
z Perform the corresponding calibration if any test item of the system test about
measurement accuracy is failed.
The anesthesia machine provides the function of monitoring volume, pressure, FiO2, CO2
concentration, AG concentration 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 monitor
board, expiratory valve assembly or three-way 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 great
(more than 10% 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 is
replaced.
2 Flow calibration
(factory)
Calibrate the flow
sensors and inspiratory
valve of the anesthesia
machine.
1. The expiratory valve assembly is
replaced.
2. The monitor 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
(factory)
Calibrate the pressure
sensors and PEEP valve
of the anesthesia
machine.
1. The monitor 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 2% of the reading or 1
cmH2O, whichever is greater.
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