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5. For any sampling line connection errors, reconnect the sampling line and ensure that it is
connected correctly.
Perform the following operations to diagnose the measurement error of the pressure
sensor:
As the actual pressure increases, the measurement value of the pressure sensor
increases accordingly. Otherwise, the calibration data is incorrect. In this case, you
need to recalibrate the pressure sensor.
The measurement value of the pressure sensor is accurate compared with that of
standard pressure measurement equipment (calibration equipment of the
anaesthesia machine). Otherwise, the calibration data is incorrect. In this case, you
need to recalibrate the pressure sensor.
For details, see section 4.14.3 Constant Pressure Test (Checking the Pressure Sensor
Accuracy).
8.5.7 Diagnosing Inspiratory valve Exceptions
You can check whether the status of the inspiratory valve is correct by using the valve diagnosis
tool.
1. The tubes of the anaesthesia machine are connected according to the settings for
checking whether the sampling line of the pressure sensor is connected normally. For
details, see section 8.5.3 Preparations Before Using the Valve Diagnosis Tool.
2. In the Diagnostic Tests menu, increase the D/A value of the inspiratory valve gradually.
If the measurement values of the embedded flow sensor, inspiratory flow sensor and
expiratory flow sensor change slightly and the air flow at the interface of the water
collection cup in the breathing system is light, the inspiratory valve or VCM has D/A
problems.
3. In normal cases, if the D/A value is set to 2500 for the inspiratory valve, the flow
volume measured by the standard flow measurement equipment can reach 90 L/min.
4. If the D/A value is set to be over 4000 for the inspiratory valve, the flow volume
measured by the standard flow measurement equipment cannot reach 90 L/min and the
flow calibration fails. In this case, you need to replace the expiratory valve or VCM.
5. To check whether the VCM has DA output problems, measure the DA output
corresponding to the inspiratory valve on the VCM by using a multimeter. If the voltage
increases as the DA increases and approaches 6 V when the DA is over 4000, the DA
corresponding to the inspiratory valve of the VCM may be normal.
6. After replacing the expiratory valve or VCM, check whether the problem is solved by
using similar methods.
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