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System Calibration Calibration

4 - 8 046-006272-00 A7™ Service Manual

NOTE: If measurement deviations are not corrected after multiple flow sensor

calibrations, the user is recommended to replace the flow sensor and

then perform calibration. If the problem persists, factory maintenance

is necessary.

4.3.2 Flow Calibration (Service)

NOTE: Flow 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 flow sensor and that of the standard flow measurement device,

you need to perform Flow Calibration (Service).

This calibration is intended for the flows sensors in the breathing circuit, ventilator flow sensor, and

also inspiratory valve. The standard flow measurement device is used to calibrate the flow sensors

and inspiratory valve.

4.3.2.1 Calibration Procedures

NOTE: Make sure that the tubes are not leaking when connected.

NOTE: Do not move or press the tubes during calibration.

NOTE: When connecting calibration tubes, make sure that gas flows in the

correct direction, which is from the inspiration connector of the

breathing system, through high flow inlet of the anesthesia machine

calibration device, anesthesia machine calibration device, high flow

outlet of the anesthesia machine calibration device, and to the

expiration connector of the breathing system.

NOTE: Before calibration, make sure that no sensor or valve related technical

alarms occurred.

NOTE: During calibration, make sure that the drive gas pressure is enough.

Failure to do so may lead to calibration failure.

NOTE: You can select VT Plus for auto calibration. You can also select flow

calibration device which satisfies the accuracy requirement for manual

calibration.

NOTE: For calibration device with high flow channel and low flow channel,

flow channel switch over is required during auto or manual calibration.

NOTE: Set the machine to work in EFCS mode for flow calibration.

4.3.2.2 Auto Calibration

Follow these steps to calibrate flow sensors.

1. Enter Standby.

2. Select Setup-> Service-> Calibration-> Flow Sensors to access the screen as shown.

Mindray A7 Service Manual

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