Abstract
This paper presents the design and test results of a weir used to measure the flow rate of saturated liquid helium in a two phase helium flow stream. The flow meter requires the presence of saturated vapor to measure the liquid flow rate but does not measure the vapor flow rate. The weir, located at a high point in the flow path, acts as a dam and creates a reservoir of liquid behind it. Liquid helium drains through a notch in the weir. The liquid helium level behind the weir is measured to determine the flow rate. The level increases with flow rate. The unmeasured vapor passes over the top of the weir and mixes with the liquid downstream of the weir. A weir was installed on the outlet of a string of superconducting magnets.
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