Measuring and testing – Liquid level or depth gauge
Patent
1994-09-21
1997-03-18
Chilcot, Richard
Measuring and testing
Liquid level or depth gauge
73290R, 324637, 324648, G01F 2320, G01R 2706
Patent
active
056112394
ABSTRACT:
A microwave point level instrument is adapted to detect level or change of products in a storage vessel. The instrument includes a microwave transducer periodically developing a pulse of microwave energy. A microwave bridge is driven by the transducer for receiving pulses of microwave energy. The bridge includes a reference arm receiving a portion of each pulse of microwave energy to be altered by a variable impedance tuning circuit. A measurement arm receives another portion of each pulse of microwave energy to be altered by dielectric properties of a product at a process seal installed in a storage vessel, in use. A detector arm develops a microwave signal responsive to imbalance in the bridge between the microwave energy altered by the tuning circuit and the microwave energy altered by the dielectric properties of the product. A sensing circuit is coupled to the bridge detector arm for developing an electrical signal responsive to the microwave signal representing the imbalance. A self-test circuit is operatively associated with the bridge for automatically varying the impedance in the bridge to simulate effects of a change of dielectric properties of a product at the process seal. An output circuit is operatively driven by the sensing circuit for indicating the determined imbalance.
REFERENCES:
patent: 2498548 (1950-02-01), Howard
patent: 2596531 (1952-05-01), Clarke
patent: 2597327 (1952-05-01), Hollingsworth
patent: 2611804 (1952-09-01), Zaleski
patent: 2798197 (1957-07-01), Thurston
patent: 2864953 (1958-12-01), De Lange
patent: 2903653 (1959-09-01), Grantham et al.
patent: 2934658 (1960-04-01), Lewis
patent: 2946965 (1960-07-01), Albanese
patent: 3182203 (1965-05-01), Miller
patent: 3258688 (1966-06-01), Augustine et al.
patent: 3271668 (1966-09-01), Haake et al.
patent: 3572119 (1971-03-01), Bak
patent: 3594667 (1971-07-01), Mann
patent: 3657668 (1972-04-01), Craven et al.
patent: 3818333 (1974-06-01), Walker
patent: 3836846 (1974-09-01), Overall et al.
patent: 3921106 (1975-11-01), Williams
patent: 4044355 (1977-08-01), Edvardsson
patent: 4045727 (1977-08-01), Yu et al.
patent: 4055252 (1977-10-01), Klamm et al.
patent: 4107993 (1978-08-01), Shuff et al.
patent: 4144517 (1979-03-01), Baumoel
patent: 4210023 (1980-07-01), Sakamoto et al.
patent: 4218678 (1980-08-01), Fowler et al.
patent: 4238795 (1980-12-01), Schick et al.
patent: 4339648 (1982-07-01), Jean
patent: 4359902 (1982-11-01), Lawless
patent: 4375057 (1983-02-01), Weise et al.
patent: 4425793 (1984-01-01), Turton et al.
patent: 4458530 (1984-07-01), Bastida
patent: 4566321 (1986-01-01), Zacchio
patent: 4588966 (1986-05-01), Horn et al.
patent: 4588967 (1986-05-01), Horn et al.
patent: 4670754 (1987-06-01), Zacchio
patent: 4765705 (1988-08-01), Seymour et al.
patent: 4833918 (1989-05-01), Jean et al.
patent: 5351036 (1994-09-01), Brown et al.
Amrozowicz Paul D.
Chilcot Richard
Magnetrol International Inc.
LandOfFree
Microwave point instrument with self-test circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microwave point instrument with self-test circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microwave point instrument with self-test circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1698630