Apparatus and method for measuring cryogenic exhaust flow

Abstract

An apparatus for measuring flow of cryogen exhaust gas from a freezer includes a flow probe including a first resistive heater and a second resistive heater, the first and second resistive heaters adapted for being exposed to the cryogen exhaust gas; and a flow probe control coupled to the first resistive heater and the second resistive heater, the flow probe control including a control circuit constructed and arranged to: operate the first resistive heater at a first temperature, operate the second resistive heater at a second temperature different from the first temperature, wherein the first temperature and the second temperature each remain constant and greater than a predetermined threshold temperature, and determine a heat transfer coefficient for the flow of the cryogen exhaust gas over the first and second resistive heaters. A related method is also provided.

Dependencies are inferred from the claim text.