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4. Connect the low flow inlet of the calibration device to the fresh gas port of the
anesthesia machine breathing system through breathing tube.
5. In case of calibrating N2O electronic flowmeter, first disconnect O2 from the electronic
flowmeter so as to eliminate the effect of O2-N2O cut-off valve and O2-N2O chain
linkage onto N2O electronic flowmeter calibration. To do this, remove the rear panel of
the anesthesia machine, you can see that O2 is divided into two pathways through the Y
piece, one to the O2-N2O cut-off valve and the other to the flowmeter. Unplug the tube
leading to the flowmeter and plug the outlet of the Y piece.
6. Press the “MODE” key on the control panel of the calibration device and select
“Calibration Flowmeter” to access the electronic flowmeter calibration display, as
shown below.
Low flow outlet (0 to 15 L/min) Low flow inlet (0 to 15 L/min)
Measured gas selected
Currently measured flow
Calibration communication
connector of the anesthesia machine
Communication cable B
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