Heated junction thermocouple level measurement apparatus.

摘要

A liquid level sensing apparatus (32) comprises a plurality of axially spaced sensors (36) enclosed in a tube (86) for separating liquid and gaseous phase. The separator tube (86) contains inlet-outlet ports (90, 92) near the top and bottom thereof to equalize the liquid level inside and outside the separator tube (86). Each sensor (36) is comprised of a heater (64), a heated thermocouple junction (68) and an unheated thermocouple junction (66) within an elongated heat conductive housing (62). The heated portion of housing (62) is enclosed in splash guard (72) with inlet-outlet ports (78, 82) near the top and bottom. The separator tube (86) is enclosed in support tube (100) which may be enclosed in a shroud (110). The lateral inlet-outlet ports (90, 92) of separator tube (86) are axially offset from lateral inlet-outlet ports (102) of support tube (100) at least where support tube (100) is subjected to cross flow. The shroud (110) is open on the bottom and has lateral inlet-outlet ports (112) to equalize liquid level fluctuations inside and outside shroud (110).