A7™ Service Manual 046-006272-00 3 - 25
Periodic Maintenance Functional Tests
3.8.7 Check the Flow Sensor Accuracy
NOTE: You can use any flow meter that has an accuracy of at least ±2% for the
accuracy measurement of the flow sensors.
NOTE: Set the Gas Flow Analyzer Correction Mode to ambient temperature
and pressure.
To check the measurement accuracy of flow sensors:
1. Remove the bellows dome, then the Bellows and re-install the bellows dome.
2. Remove the water trap.
3. Put the AUTO / MANUAL Lever in the AUTO position.
4. The pneumatic connections between the anesthesia machine and calibration device are as
shown in the following picture. You can connect the tube to a high-flow connector or low-flow
connector based on the requirements.
FIGURE 3-27 Pneumatic Connections Between Anesthesia Machine and Calibration Device
5. Setting up the flow meter:
Calibration Device (Fluke VT Plus)
a. Setup the calibration device as described below:
b. Flow Setting: Press the Flow button on the front control panel of the calibration. You can set
Range to High Flow or Low Flow as required.
High-Flow
Connector
Low-Flow
Connector
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