When used to control the flow of medical gases to a patient, how is a Thorpe tube classified?
a. Variable-orifice, constant-pressure flow-meter device
b. Fixed-orifice, constant-pressure flowmeter device
c. Variable-orifice, variable-pressure flow-meter device
d. Fixed-orifice, variable-pressure flowmeter device
ANS: A
Compared with the flow restrictor and the Bourdon gauge, the Thorpe tube functions as a varia-ble-orifice, constant-pressure flowmeter device, so increasing the size of the orifice increases the gas flow.
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