Patent ID: 7437940

Claim:
An apparatus for measuring differential pressure, the apparatus comprising: a first sensor unit configured to detect directly a first pressure of a substance at a first position, the first sensor unit being configured to acquire a first detection result that indicates the first pressure; and a second sensor unit configured to detect directly a second pressure of the substance at a second position, the second position being different from the first position, the second sensor unit being configured to acquire a second detection result that indicates the second pressure, the second sensor unit being configured to receive the first detection result from the first sensor unit, the second sensor unit being configured to calculate a differential pressure between the first and second positions with reference to the first and second detection results, wherein the first and second sensor units are operatively coupled to each other to acquire the first and second detection results synchronously with each other, and wherein the second sensor unit is configured to generate a synchronizing signal and transmit the synchronizing signal to the first sensor unit, the first and second sensor units acquire the first and second detection results synchronously with each other based on the synchronizing signal.