6-4
No. Calibration Item Function Description Calibration Occasion
3 Flowmeter zeroing
(user)
Calibrates zero offset in
the flowmeter.
Zero offset exists in the
flowmeter.
The monitored value deviates
from the total flow setting by 100
ml or 5%, whichever is larger; or
the monitored value deviates from
the limb flow setting by 50 ml or
5%, whichever is larger.
The flowmeter still displays a
flow reading after all fresh gases
4 High-flow O2 supply
zeroing (user)
Calibrates zero offset in
the high-flow O2 supply
module.
1. Zero offset exists in the high-flow
O2 supply module (the monitored
value deviates from the total flow
setting by 2 L or 10%, whichever
is larger).
2. The high-flow O2 supply module
is replaced.
5 Pressure calibration
(service)
Calibrates the pressure
sensor and PEEP valve
of the anesthesia
machine.
1. The VCM is replaced.
2. The expiratory valve assembly is
replaced.
3. The sensor adapter board is
replaced.
4. The measured value of the
machine's pressure sensor
deviates from that of the standard
pressure gauge by 5% of the
reading or 2 cmH2O, whichever is
larger.
6 Expiratory valve
calibration (service)
Calibrates the expiratory
valve of the anesthesia
machine.
1. The VCM is replaced.
2. The drive gas assembly is
replaced.
3. The sensor adapter board is
replaced.
7 Pressure and flow
zeroing (service)
Calibrates zero offset in
the VCM and VPM.
The flow or pressure waveform
deviates from the baseline.
8 Total flow sensor
calibration (service)
Calibrates the total flow
sensor of the electronic
flowmeter and obtains
the N2O factor of the
sensor.
1. The N2O factor of the total limb
O2 flow sensor is excessively
large.
2. The flow sensor is replaced.
The electronic flowmeter board is
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