The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
叙述了液柱式压力计的精度，对U形管压力计和双管差压计的正确使用方法及误差修正做了简要分析。
2
A differential pressure gauge is recommended for test no. 1 rather than a manometer for the following reasons: It utilizes minimum time to perform the test.
对于检测1，建议采用差压表，而不要采用流体压力表，理由在于差压表进行检测的时间最短。
3
Lastly, the paper USES SIMULINK to the compare differences between the nonlinear and linear manometerdifferential equation.