7-3
7.3 System Calibration
NOTE
The drive gas of the anesthesia machine and the drive gas set in the calibration
device must be consistent with the actual drive gas configured for the machine.
If a test item concerning measurement accuracy fails in the system test, perform
relevant calibration.
VT or Fluke VT Plus: The zero point (baseline) of pressure measurements may
slightly drift with the temperature and time. Users can perform zeroing manually
to eliminate zero offset. In general, zeroing needs to be performed if the monitor
displays a non-zero reading in the case of no pressure. Perform zeroing on the
calibration device before making any measurements.
You can use VT or Fluke VT Plus to perform automatic calibration on pressure
sensors or flow sensors, or use other calibration devices meeting the accuracy
requirement to perform manual calibration.
The anesthesia machine provides the functions of monitoring the volume, pressure, inspiratory O2
concentration, CO2 concentration, and gas concentration inside the machine. Great measurement
deviations of the monitored values are very likely to be caused by the offset in measured values of
relevant measurement components, and calibration needs to be performed. After the machine is
serviced, for example, the VCM or expiratory valve assembly is replaced, the flow sensors or
pressure sensors of the machine need to be calibrated. The following table lists the possible
calibration items and calibration occasions.
No. Calibration
Item
Function
Description
Calibration Occasion
1 Flow
calibration
(user)
Calibrates flow
sensors of the
breathing system.
1. The TV measured value greatly deviates from
the settings (with the deviation of more than 9%)
after the flow sensors in the patient circuit have
been used for a long time.
2. The flow sensors in the patient circuit are
replaced.
2 Flow
calibration
(service)
Calibrates the
flow sensors and
inspiration valve
of the anesthesia
machine.
1. The expiratory valve assembly is replaced.
2. The VCM is replaced.
3. The measured value of the built-in flow sensor
deviates from that of the flow measuring device by
5% of the reading or 1 L/min, whichever is larger.
3 Pressure
calibration
(service)
Calibrates the
pressure sensors
and PEEP valve of
the anesthesia
machine.
1. The VCM is replaced.
2. The expiratory valve assembly is replaced.
3. The measured value of the machine's pressure
sensor deviates from that of the standard pressure
gauge by 5% of the reading or 2cmH2O,
whichever is larger.
4 Pressure and
flow
zeroing
(service)
Zeros the VCM
and the auxiliary
VCM.
The pressure or flow waveform deviates from the
baseline.
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