Patent ID: 6016706
Filing Date: 2000-01-25
Classification: G01L

Abstract:
A process state detector comprising:a first differential sensor including a first set of resistors and sensitive to one physical state of a process whereby a resistance value of said first set of resistors is changed, anda second differential sensor including a second set of resistors and sensitive to said one physical state of said process whereby a resistance value of said second set of resistors is changed;a resistance value difference monitor receiving as inputs the resistance value of said first set of resistors and the resistance value of said second set of resistors, said monitor adapted to monitor long-term accuracy of the differential sensors by monitoring said resistances of said first set of resistors and said resistances of said second set of resistors respectively and comparing the resistances thereof; anda static pressure sensor, an output of said static pressure sensor and said difference monitor being used to compensate a differential pressure.