Mindray A8 - Expiratory Valve Calibration (Service)

6-39
Failure
Description
Possible Cause Recommended Action
3. Perform the calibration again.
4. Replace the VCM.
Display C The calibration data of the esophageal
pressure sensor does not conform to
monotonicity (the AD value of the
former calibration point is greater than
that of the latter calibration point).
1. Check the pipeline connection
and the gas tightness.
2. Check whether the gas supply
pressure ranges from 280 kPa
to 600 kPa (40 psi–87 psi).
3. Perform the calibration again.
4. Replace the VCM.
Display 9 The pressure change is nonlinear. 1. Perform the calibration again.
2. Replace the VCM.
Display 34
The drive gas pressure is low. 1. Check whether the gas supply
pressure ranges from 280 kPa
to 600 kPa (40 psi–87 psi).
2. If the gas supply is normal,
replace the gas supply
pressure switch.
Display 39
The system fails to write data into
EEPROM.
1. Perform the calibration again.
2. Replace the VCM.
Display 3B
The ACGO switch is in the ON
position.
1.
Check whether the ACGO
switch is set to OFF.
2. Check the monitoring status of
the ACGO switch on the
screen of the anesthesia
machine.
6.3.6 Expiratory Valve Calibration (Service)
6.3.6.1 Principles
NOTE
 Perform expiratory valve calibration (service) when the expiratory valve
assembly or VCM is replaced.
 When a great deviation (5 cmH2O and 20% of the valve opening setting,
whichever is larger) is detected between the control effect of the machine
expiratory valve and the setting, you need to perform expiratory valve
calibration (service).
 Before calibration, ensure that the drive gas supply is connected. This
calibration item is intended to calibrate the expiratory valve by using the
anesthesia machine's internal pressure sensor on which pressure calibration has
been performed as the calibration reference. No ventilator calibration device is
required.