In a 15 ° two dimensional conical packed bed gas velocity profiles on the bed surface as well as pressure drops over the bed were measured at various apparent velocities using a hot wire anemometer and U tube manometer .

针对15°二维锥形填充床，在不同表观气速下，用热线风速仪测定了床层表面的气速分布，用 U 形 管 压 差 计测定了床层压降。

The presentation of usage of liquid column manometer . The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed .

主要介绍了液柱压力计的正确使用方法和误差分析。给出了 U型 管 压力 计和双管差压计的测量精度。