Mindray WATO EX-55Pro, Service Manual

Page: 247 / 474

7-51
Error Code Description Recommended Action
is not in the normal range of
3586 to 9140 (AD value). O2 sensor is proper.
Check whether the O2 sensor is in the
21% O2 environment.
Check whether the output voltage of the
O2 sensor in the calibration menu is
stable.
Replace the O2 sensor.
00000010 The 100% O2 calibration
value is not in the normal
range of 9602 to 35727 (AD
value). Check whether the cable connection of the
O2 sensor is proper.
Check whether the O2 sensor is in the
100% O2 environment.
Check whether the output voltage of the
O2 sensor in the calibration menu is
stable.
Replace the O2 sensor.
00000020 An EEPROM writing error
occurs. Perform the calibration again.
Replace the VCM.
7.3.7 Total Flow Sensor Calibration (factory)
7.3.7.1 Calibration Mechanisms
To support the flow sensor self-test, it is necessary to find out the relationship of N2O
measurement between the O2 flow sensor in total limb and the flow sensor in N2O limb.
Therefore, it is necessary to vent in N2O to the machine to calibrate the O2 flow sensor in total
limb. This operation is performed manually.
The calibration principles are described as follows: The EFCS flowmeter keeps the proportional
valve in the balance limb and N2O three-way valve open at a fixed flow for a period of time.
Record the N2O value measured by the O2 flow sensor in total limb for a period of time. Then,
calculate the average value based on the recorded N2O values. The average value and the current
N2O value measured by the flow sensor in N2O limb form a data point in the calibration table and
so on. The points after calibration is completed form a calibration table.
7.3.7.2 Precautions
NOTE

Ensure that the N2O supply is connected and its pressure is within the normal
range.

Ensure that the machine is in the EFCS state.

Ensure that hte machine is in the EFCS state. Connect the N2O supply and ensure
that the gas supply pressure is within the normal range. In the manual test under
the FCS test menu, open the N2O valve to make the value measured by the N2O
flow sensor become 0.5, 1, 2, 4, 6, 8, 10, and 12 in sequence. Then, observe whether
the value of each point measured by the flow sensor in total limb is within the
accuracy range. If the value is out of the accuracy range, calibration is required.