Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Lubricant testing
Patent
1988-11-30
1990-08-21
Noland, Tom
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Lubricant testing
73439, 73302, G01N 928
Patent
active
049495720
ABSTRACT:
A microprocessor based instrument is provided for measuring liquid level, specific gravity, or density.
The instrument includes a mainframe controller, a remote sensor, and two sets of dip tube assemblies, one for each of two measurement channels. The instrument allows the operator to control both the time at which a bubble is released from one of the dip tubes into a liquid and also the size of the purge bubble which is released. By controlling the timing of bubble release, the pressure within a dip tube can be measured after the system has been allowed to quiet down. If a pair of dip tubes is employed within the same vessel, the differential pressure can be measured when the pneumatic line pressure variations have reached steady state, that is after the gas flow into the dip tubes has been discontinued.
REFERENCES:
patent: 2604778 (1952-07-01), Marquardt
patent: 3380463 (1968-04-01), Trethewey
patent: 3460394 (1969-08-01), Cryer
patent: 3740041 (1973-06-01), Jones
patent: 4419893 (1983-12-01), Baillie et al.
CIC Model 7700 (undated) but by Feb. 1989; 4 page brochure.
Dahl Application Bulletin No. AB-17 (Jul. 1983); 4 pages.
CIC Instrumentation Tech-Notes (Sep. 1, 1976); 4 pages.
CIC Instrumentation Tech-Notes 762 (Nov. 15, 1976); 4 pages.
Cooper Frank
Wilen Don J.
Computer Instruments Corporation
Noland Tom
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