System Calibration Calibration
4 - 4 046-006272-00 A7™ Service Manual
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.
4.3.1 Flow Calibration (User)
NOTE: The flow sensors must be recalibrated after replacing or reinstalling the
flow sensors.
NOTE: This calibration is only intended for the user. A trained technician
should always perform the flow calibration in the service mode when a
calibration is required.
NOTE: The measurements performed by the flow sensors may be affected by
the environment where the sensors are used. After the sensors have
been used for a long time, great deviations may occur to the
measurement results and tidal volume control as well. This problem can
be fixed through flow sensor calibration.
NOTE: Before calibration, perform leak test of the breathing system in
mechanical ventilation mode first and make sure that the test is passed.
NOTE: During calibration, make sure that the drive gas pressure is kept within
specifications. Failure to do so may lead to calibration failure.
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.
5
EFCS flowmeter
zeroing (user)
Calibrates zero offset in the
EFCS flowmeter..
Zero offset exists in the EFCS flowmeter. The
EFCS flowmeter still displays a non-zero flow
reading after all fresh gas supplies are turned off.
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