Differential pressure transducer

Details Differential pressure transducer Differential pressure transducer

G - Physics

01

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354/30

G01L 13/06 (2006.01) G01L 9/00 (2006.01) G01L 9/12 (2006.01) G01L 13/02 (2006.01) G01L 23/12 (2006.01)

Patent

CA 1168755

ABSTRACT OF THE DISCLOSURE A differential pressure measuring system is disclosed. The system includes two quartz capacitive pressure transducers (14, 16). Each capsule contains a pressure sensitive capacitor (Csa, Csb) and a relatively pressure invariable reference capacitor (Cra, Crb). The pressure sensitive capacitors (Csa, Csb) are excited by out-of- phase signals (Vr, -Vr)which further excite the associated reference capaci- tors (Cra,Cb), out of phase, respectively. The outputs of all capacitors are combined in a summing junction (22) whose output controls the count of a digital integrator (34). A closed loop is formed by converting the output of the integrator (34) to a negative feedback signal (if) which is applied to the summing junction (22) through a feedback capacitor (Cf). The integrator (34) incrementally changes the feedback signal (if) in a direction to balance the loop. At this point the output of the integrator (34) is representative of the measured differential pressure. (Figure 2)

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