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11 Cards in this Set
- Front
- Back
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Describe the physics of flowmeters at low flows
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Flowmeter acts like a tube, flow is laminar, and viscosity determines flow (Poiseuilles law)
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Describe the physics of flowmeters at high flows
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Flowmeter acts like an orifice, flow is turbulent and density determines flow (Graham's Law) [like why they use heliox - decreased density => higher flow when flow is turbulent]
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At high altitudes, how do flowmeters respond?
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actual flow is > than indicated flow
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In a hyperbaric chamber, how do flowmeters respond?
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actual flow is < than indicated flow
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What should be done before pipeline or cylinder gas is connected?
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All flowmeters should be turned off.
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Are the flowmeters interchangable, or gas-specific?
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Gas specific
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Describe the O2 knob
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Larger and serrated
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Where is the O2 flowmeter located?
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Always on the right side, downstream of other gasses in the manifold.
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How much more accurate are the electronic flowmeters?
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5-10x
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How is O2 concentration at the common gas outlet calculated?
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O2 LPM/Total gas flow LPM = %O2
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What is minimum O2 flow?
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On older machines, 250 ml O2 enters flowmeter when machine is turned on but flowmeter is still closed. Only w/ N2O, not air.
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