Theory Of Operation; Mixing Operation - Maxtec MaxFLO2 Manual De Instrucciones E Instrucciones De Uso

11.0 THEORY OF OPERATION

11.1 Mixing Operation

The MaxFLO is designed to utilize two 50 PSIG (345 kPa) gas sources - medical grade
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air and oxygen (Figure 1, for reference only). The two gases enter through the air and
oxygen inlet connectors located on the left and right side of the MaxFLO respectively.
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Each inlet connector incorporates a one-way check valve which prevents reverse gas
flow from either the air or oxygen supply system in the event of a loss of pressure from
either gas source. The check valves are followed by a 45-90 micron particulate filter.
Once through the filters, each gas passes through a flow control valve and then into
a non-pressure compensated flowmeter. The non-pressure compensated flowmeters
display flow correctly by means of a float, regardless of the inlet pressure, due to flow
being exhausted to atmosphere. Inlet pressures over 100 PSIG (690 kPa) risk damaging
the mixer and/or causing injury and should never be surpassed. The flowmeters will
continue to display the correct flow as long as no back pressure develops. The effects of
backpressure are discussed and diagrammed in section 12.3 of this operating manual.
Figure 1
Air Flowmeter Oxygen Flowmeter
Air Flow Control Valve O
2 Flow Control Valve
Air Inlet
O
2 Inlet
Air O
2
Mixed Gas Outlet
Mixed Gas
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