大量的连续生产过程要求自动测定液体介质的密度,其相对误差不大于±1%,而在许多情况下,这种误差要求不大于±0.1%。密度计的读数不应取决于流动介质的粘度和速度,不应该有小的惯性,也不应该有模拟和数字式的输出信号。目 A large number of continuous production processes require the automatic determination of the density of the liquid medium with a relative error of not more than ± 1%, and in many cases no more than ± 0.1% of this error. Densitometer readings should not depend on the viscosity and speed of the flowing medium, should not have small inertia, and should not have analog and digital output signals. Head