TEMPERATURE COMPENSATION FOR STRAIGHT TUBE CORIOLIS FLOWMETER

摘要

Method and apparatus for providing compensation of mass flow rate and densit y for the flow tube of a single straight flow tube Coriolis flowmeter. Thermal stress compensation is provided by the use of a plurality of sensors on various portions of the flowmeter. A first sensor is coupled to the flow tub e and provides information regarding the flow tube temperature. A plurality of additional sensors are connected to form a network having a two wire output. The additional sensors apply a composite signal over the two wire output of the network to meter electronics. The network signal represents the composit e temperature of the flowmeter elements that can cause thermal stress on the flow tube when a temperature differential exists between the flow tube and t he temperature of these plurality of elements. The additional elements include the balance bar and the flowmeter case. Sensitivity compensation is provided by the use of a novel algorithm. Density is measured in a single tube flowmeter that is calibrated using two materials of different densities by t he use of density equation that has non-linear components representing the deviation of the meter calibration from linear.