| 摘要 |
A method and apparatus for sensing a pressure difference between a first and second region is disclosed. The apparatus includes a motor assembly having a backplate and a diaphragm, the motor assembly being operably attached between the first and second regions. The motor assembly also having a capacitance responsive to a difference in atmospheric pressure between the first and second regions. A measurement device utilizes the capacitance for detecting the pressure difference between the two regions. The apparatus is adaptable for cooperation with a chemical dispenser for dispensing a prescribed dosage to an individual.
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