Patent ID: 6932114

Claim:
A fluid delivery system having a fluid-handling unit comprising: a tube adapted for receiving a fluid from a fluid source, the tube comprising a freestanding tube portion through which the fluid flows; means for vibrating the freestanding tube portion of the tube at a resonant frequency thereof that varies with the density of the fluid flowing therethrough, the Coriolis effect causing the freestanding tube portion to twist while being vibrated at resonance, the freestanding tube portion exhibiting a degree of twist that varies with the mass flow rate of the fluid flowing therethrough; means for sensing movement of the freestanding tube portion of the tube, the movement-sensing means producing a first output signal based on the resonant frequency of the freestanding tube portion and a second output signal based on the degree of twist of the freestanding tube portion; means for setting a range for the first output signal corresponding to a range for the density of the fluid; and means for stopping flow of the fluid through the fluid handling unit in response to the first output signal from the movement-sensing means, wherein the flow-stopping means, the movement-sensing means, and the range-setting means cooperate to stop the flow of the fluid through the fluid handling unit if the density of the fluid is outside the range therefor set with the range-setting means.