Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1989-08-15
1991-11-19
Noland, Tom
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73708, 73756, G01L 2700, G01L 1904, G01L 1912
Patent
active
050656112
ABSTRACT:
A differential pressure measuring system comprising a transmitter for a pressure-measuring instrument connected to a control room by a two-wire transmission line carrying a d-c signal powered from the control room and representing the measured pressure. The instrument includes a reference pressure device of the falling-ball type, wherein a ball is first lifted to an upper position and then allowed to descend under the force of gravity to produce a reference pressure pulse for calibrating the instrument span. The lifting device for the ball is a two-coil magnetic actuator powered by current from the two-wire transmission line, and is operable at a sufficiently low current to be classified intrinsically safe. The reference pressure device is supported by an adjustable mounting providing two degrees of freedom for movement so as to permit ready adjustment of the device orientation to assure alignment with the force of gravity.
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"Rotation of a Free-Piston Monometer Piston with Changes in its Tilt Angle", Measurement Techniques, vol. 19, No. 5, pp. 689-691, May 1976, (publ. Oct. 1976) by V. K. Maskaev.
Angelosanto John P.
Sgourakes George E.
Noland Tom
The Foxboro Company
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