Mindray WATO EX-55, Service Manual

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7. Select gas type through the “GAS” key on the panel to make sure that the gas selected is
same to that actually used for calibration.
NOTE
z
The gas type selected on the anesthesia machine calibration device must be same to
that actually used for calibration. Failing to comply with this will lead to invalid
calibration.
8 Make that the anesthesia machine is in standby mode. Select the [
Maintenance
]
shortcut key → [
Factory Maintenance >>
] → enter the required password → [
Factory
Cal. >>
] → [
Flowmeter Zero Cal. >>
] to access the [
Flowmeter Zero Cal.
] menu.
9. Turn the flow control to cause the reading on the calibration device to be same to the preset
value of calibration point required in the [
Flowmeter Zero Cal.
] menu.
10 After calibration, refer to
4.2.7Check the Electronic Flowmeter Accuracy
to test the
effectiveness of electronic flowmeter calibration.
4.3.4.2 Commonly-encountered Problems and Recommended Actions
Failure description Possible cause Recommended action
The calibration error
alarm occurs during
calibration. During calibration, the A/D value of the
sensor crosses the range. 1. Calibrate again.
2. If the alarm is not cancelled
after repeated calibrations,
replace the flow restricting
device of the electronic
flowmeter or replace the
electronic flowmeter board
and then calibrate again.
The electronic
flowmeter provides
inaccurate
measurement after
calibration. 1. During calibration, the gas flow is
failed to be adjusted to the preset value.
2. The electronic flowmeter is not
restarted after calibration.
3. Not calibrations of all gases are
completed.
4. During calibration, the needle valve of
some gas supply is not fully turned off. 1. Restart the anesthesia
machine and electronic
flowmeter and then perform
measurement again. If the
measured value is still
inaccurate, calibrate again.
2. Before calibration, turn off
the needle valve of the gas
supply .