Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1988-02-23
1989-05-02
Woodiel, Donald O.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73727, 310328, 310338, G01L 708, G01L 906, G01L 2700
Patent
active
048256854
ABSTRACT:
A self monitoring pressure transducer includes a reference chamber, that transmits the pressure through a fluid medium to the flat side of a diaphragm, using a piezoelement, arranged in the reference chamber, as an electrically controllable actor. The piezoelement can modulate the pressure in the reference chamber by a predetermined quantity. The modulation of the measuring signal associated with this pressure modulation permits self-monitoring of the pressure transducer while it is in operation.
REFERENCES:
patent: 2569987 (1951-10-01), Frondel
patent: 2571899 (1951-10-01), Kroft et al.
patent: 3766415 (1973-10-01), Dame et al.
Siemens Aktiengesellschaft
Woodiel Donald O.
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