Measuring and testing – Specific gravity or density of liquid or solid – Freely vertical reciprocable float with carried indicium
Patent
1989-07-31
1991-01-29
Chapman, John
Measuring and testing
Specific gravity or density of liquid or solid
Freely vertical reciprocable float with carried indicium
73440, G01N 910
Patent
active
049877780
ABSTRACT:
A comparative temperature compensating specific gravity test apparatus is disclosed including an indicator float element that has a predetermined specific gravity and is freely suspended in a homogeneous test liquid. The float element includes pliable, sealed container that is substantially free of contained gas and a reference liquid that fills the container. The reference liquid has a thermal expansion characteristic which is substantially the same as that of the test liquid. The container has a mass which is negligible relative to the mass of the reference liquid. The float element is monitored in the test liquid such that floating of the float element indicates that the test liquid has at least the predetermined specific gravity and sinking of the float element indicates that the test liquid has less than the predetermined specific gravity.
REFERENCES:
patent: 1335253 (1920-03-01), Midgley
patent: 3808893 (1974-05-01), Jinno et al.
patent: 4338817 (1982-07-01), Callahan
patent: 4473530 (1984-09-01), Villa-Real
patent: 4590800 (1986-05-01), Shimoda
Chapman John
HF Scientific, Inc.
Noonan William E.
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