Which of the following is true about an uncompensated Thorpe tube?
a. Flow lower than actual if downstream pressure increases
b. Fixed-orifice, variable-pressure flowmeter device
c. Flow-control needle valve placed distal to the flow tube
d. Accuracy unaffected by changes in downstream resistance
ANS: A
Under these conditions, an uncompensated Thorpe tube falsely shows a flow lower than that ac-tually delivered to the patient.
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