DIFFERENTIAL FLOAT MEANS AND SENSOR MEANS INCORPORATING SAME

摘要

PCT No. PCT/AU91/00386 Sec. 371 Date Feb. 19, 1993 Sec. 102(e) Date Feb. 19, 1993 PCT Filed Aug. 23, 1991 PCT Pub. No. WO92/03718 PCT Pub. Date Mar. 5, 1992.A sensor (1) is provided for sensing the entrainment of a fluid of low specific gravity in a fluid of higher specific gravity, particularly the entrainment of refrigerant gas in refrigerant liquid. The sensor (1) is typically installed into a higher pressure liquid supply line (24) of a refrigeration system (26). The sensor (1) has a differential float (16) including a float member (54) pivoted about a pivot (56) in a chamber (14) coupled to the supply line (24). The float member (54) has a specific gravity greater than the specific gravity of both of the fluids in which it operates. However, the location of the pivot (56) intermediate of the length of the float member (54) gives a net specific gravity for the differential float (16) which is less than the specific gravity of one of the fluids. Hence, the differential float (16) can withstand a high pressure operation, say at 2MPa, and can operate as a float for detecting the presence or absence of the fluid of lower specific gravity in the fluid of high specific gravity. The differential float (16) can also be used as gauge snubber (20) or to replace refrigerant capillary control tubes.