Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1984-10-17
1987-01-27
Myracle, Jerry W.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
374143, G01L 2700, G01K 1100
Patent
active
046386564
ABSTRACT:
A differential-pressure transmitter having a range diaphragm and a slack diaphragm to receive process pressures and to apply such pressures to an interior sealed chamber containing a fill-liquid. An internal passageway between the regions adjacent the diaphragms provides for transfer of fill-liquid in response to differential pressure changes. The passageway serially includes a vertically-oriented tube containing a ball of magnetic material and surrounded by a solenoid winding. Energization of the winding lifts the ball to the top of the tube. When the winding is de-energized, the ball drops down through the fill-liquid to create a reference pressure pulse which is directed to the range diaphragm to correspondingly alter the instrument output signal. The output signal is monitored to check the span calibration, and adjustments are made as needed.
REFERENCES:
patent: 3106084 (1963-10-01), Hoffman et al.
patent: 4051712 (1977-10-01), Zias et al.
patent: 4165651 (1979-08-01), Olsen et al.
patent: 4165652 (1979-08-01), Olsen et al.
patent: 4329775 (1982-05-01), Olsen et al.
Myracle Jerry W.
Noland Tom
The Foxboro Company
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