Principle of mass flowmeter is intro-duced. Causes for error is analyzed. Factors that have impacts on accuracy of flowmeters and calibra-tion measures are presented.

• 介绍了质量流量计的工作原理,分析了误差产生的原因,指出了影响流量计准确度的各种因素,同时给出了零点校准的方法。