6-3
6.3 System Calibration
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.
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 Plus, VT650 or VT900 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 result from the offset in
measured values of relevant measurement components, and calibration needs to be performed.
In standby mode, select Main > Setup to perform flow calibration (user) and O2 sensor
calibration (user); or select Main > System > Calibrate to perform flowmeter zeroing (user),
auxiliary O2/air zeroing (user), and high-flow O2 supply zeroing (user); or select Main >
Service > Calibrate to perform pressure calibration (service), expiratory valve calibration
(service), pressure and flow zeroing (service), and total flow sensor calibration (service).
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.
The sensor adapter board is
replaced.
The VCM is replaced.
The drive gas assembly is
2 O2 sensor calibration
(user)
Calibrates the
measurement accuracy
of the O2 sensor at
both 21% O2 and 100%
O2.
1. The measured values of the O2
sensor present a deviation of
greater than 3% in both the
atmospheric environment (21%)
and pure O2 environment (100%).
2. The O2 sensor is replaced.
3. The VCM is replaced.
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