Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1988-10-24
1990-03-20
Raevis, Robert R.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01L 2700
Patent
active
049090631
ABSTRACT:
A differential pressure calibrator (with built in overrange protection) using a "dropping ball and weight" technique and a mode unit which eliminates the need for a process manifold is disclosed in the subject invention.
REFERENCES:
patent: 4604891 (1986-08-01), Sgourakes
patent: 4638656 (1987-01-01), Sgourakes
patent: 4681143 (1987-07-01), Sato et al.
patent: 4708010 (1987-11-01), Sgourakes
Raevis Robert R.
The Foxboro Company
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