Mindray WATO EX-55, Service Manual

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4-13
4.2.2 Breathing System Leak Test in Mechanical Ventilation
Mode
For details, refer to
3.7.2Breathing
System Leak Test in Mechanical Ventilation Mode.
4.2.3 Breathing System Leak Test in Manual Ventilation Mode
For details, refer to
3.7.3Breathing
System Leak Test in Manual Ventilation Mode.
4.2.4 Check the Sensor Zero Point
NOTE
z
The zero point A/D value of the airway pressure sensor and PEEP pressure sensor
should fall within the normal range of 400 to 800.
z
The zero point A/D value of the inspiratory flow sensor, expiratory flow sensor and
built-in ventilator flow sensor should fall within the normal range of 200 to 1000.
z
If the zero point of the pressure sensor has an error, in ventilation status, the
baseline of the Paw waveform is not at the zero point and a great deviation occurs
between pressure control and measurement.
z
If the zero point of the inspiratory/expiratory flow sensor has an error, in
ventilation status, the baseline of the flow waveform is not at the zero point and a
great deviation occurs between TV control and measurement.
z
If the zero point A/D value of any sensor is outside of the normal range, it cannot
be corrected. The monitor board must be replaced.
To check the sensor zero point:
1. Turn off all fresh gases and position the Y piece connector in the patient circuit to the
air.
2. Make sure that the system is Standby. Select the [Maintenance] shortcut key →
[Factory Maintenance >>] → [Diagnostic Test >>]
→
[Display A/D Channels >>]
→
[Ventilator >>] to access the [Display A/D Channels
—
Ventilator] menu.
3. Make sure that the actual measured value of each sensor is “0” (zero). Record the zero
point A/D value of each sensor and judge if the zero point falls with the normal range. If
not, replace the monitor board.