Patent ID: 8443650

Claim:
A temperature compensated pressure switch for determining and analyzing an amount of material within a vessel comprising: a first control unit; a pressure sensor connected to the first control unit outputting a first pressure data; a temperature sensor connected to the first control unit outputting a first temperature data; and a first storage unit connected to the first control unit storing minimum pressure data corresponding to temperature data, the first temperature data at periodic intervals, maximum rate of temperature change values, first substitute rate of temperature change values corresponding to maximum rate of temperature change values, minimum rates of temperature change values, and second substitute rate of temperature change values corresponding to minimum rates of temperature change values, wherein when the first control unit determines, based on the first temperature data stored in the first storage unit, that a rate of temperature change value is above a maximum rate of temperature change value, the first control unit substitutes a second temperature data, based on a first substitute rate of temperature change value, for the first temperature data for a period of time, and when the first control unit determines, based on the first temperature data stored in the first storage unit, that a rate of temperature change value is below a minimum rate of temperature change value, the first control unit substitutes a different second temperature data, based on a second substitute rate of temperature change value, for the first temperature data for a period of time, and wherein the first control unit outputs a first signal indicating the amount of material is acceptable when the first pressure data is above the minimum pressure data and outputs a second signal indicating the amount of material is unacceptable when the first pressure data is not above the minimum pressure data.