System Calibration Calibration
4 - 30 046-006272-00 A7™ Service Manual
4.3.3 Pressure Calibration (Service)
NOTE: Pressure Calibration (Service) is necessary in case of replacing the
ventilator control board, drive gas assembly or solenoid valve
assembly.
NOTE: When a great deviation is detected between the measured value of the
built-in pressure sensor and that of the standard pressure
measurement device, you need to perform Pressure Calibration
(Service).
This calibration is intended for the airway pressure sensor in the breathing circuit, PEEP pressure
sensor and the PEEP valve of the expiratory valve assembly. The standard pressure measurement
device is used to calibrate the pressure sensors and the PEEP valve.
[00 20 00 00] is
displayed.
The maximum value cannot be found.
1. Diagnose by using the valve
diagnostic tools: (1) open the
inspiration valve with 4000DA. The
flow measured by the calibration
device can reach at least 90L/min.
(2) close the inspiration valve.
Increase the opening of inspiration
valve with certain DA. When the
flow measured by the calibration
device is approximately 80L/min,
based on this DA, increase valve
opening by 10 DA. The flow
increase does not exceed 5L/Min.
It indicates that the point of
maximum value is possible (not
found by the software). Re-
calibration is recommended.
2. Replace the inspiration valve.
[00 40 00 00] is
displayed.
The minimum value cannot be found.
1. Diagnose by using the valve
diagnostic tools: open the
inspiration valve within the range
of 0~2000DA. The AD value
collected by the inspiratory flow
sensor has the tendency of
becoming bigger. Re-calibration is
recommended.
2. Replace the inspiration valve.
[FF FF FF FF] is
displayed.
Communication error occurs.
1. Restart the machine.
2. Check the communication cable.
3. Check for communication error
alarm messages. Replace the
board.
Failure description Possible cause Recommended action
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