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Figure 6.2: Recording of the calibration of the flow rotameter and pneumotachograph
The chart recording is read from right to left and the brown tracing shows the levels of flow calibrations
in mls/min. The calibrations are worked out on the sheet.
Mouth pressure.
o Open the rotameter needle valve.
o Ensure all connections are tight.
o Switch on the pressure generator (small black sliding switch, right hand side).
o Tero the display with the small black screw on the left hand side front panel of the
pressure generator.
o Z.ero calibration: connect the line from the pressure generator to the test point of the
Medex pressure transducer and ensure that it is secure - zero the pressure generator using
the wheel in the centre of the generator - zero the pressure monitor gauge making sure the
needle is on the zero of the scale -
record the zero level on the chart record.
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