Apparatus and method for calibrating span of pressure...

Details Apparatus and method for calibrating span of pressure... Apparatus and method for calibrating span of pressure...

G - Physics

01

L

73/0.5

G01L 27/00 (2006.01)

Patent

CA 1238206

Abstract Apparatus and method for calibrating span of pressure measuring instruments 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 differen- tial 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.

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