When a closed Thorpe tube flowmeter is attached to a 50-psi oxygen source, the indicator float jumps up then quickly falls to zero. This flowmeter is:
a. broken. c. compensated for back pressure.
b. a Bourdon gauge flowmeter. d. uncompensated for back pressure.
ANS: C
A flowmeter can be determined to be pressure-compensated if the following test is performed: With the needle valve closed, the flowmeter is plugged into a high-pressure gas source. If the float in the indicator tube jumps and then falls to zero, the flowmeter is pressure-compensated. The float movement occurs because the source gas must pass through the indicator tube before it reaches the needle valve.
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